Raymond E.

Watts

SERIES V
1914 55th St
Galveston, TX 77551-5125

KC5SNX@arrl.net
409-744-9466
Manual FO-850-3

Operator Instructions
Manual
GAMING EQUIPMENT Model V- t 297
CORPORATION
90 O'Leary Drive. Be nsenvi lle, Il li nois 6 0 106 , U.S.A.
Telephone: (312) 860-7777 C a bl es: Bal fan Telex 210277
© 1983 Ball y Mfg. Corp.
All Rights Reserved
..
)3
)'

-WARN ING­
THIS GAME MUST BE GROUNDED! FAILURE TO DO SO
MAY RESULT IN THE DESTRUCTION OF ELECTRONIC
COMPONENTS.

RADIO INTERFERENCE NOTICE: This equipment generates, uses and can

radiate radio frequency energy. If not installed and used in
accordance with the Instruction Manual, this equipment may cause
interference to radio communications. As required by FCC
regulations, this equipment has been tested and found in
compliance with Subpart J and Part 15 of FCC regulations, which
are designed to provide reasonable protection against such
interference. However, although this equipment complies with all
a p p I i cab I e FCC reg u I a t ion s, 0 per a t ion 0 f t his e qui p men t i n a
residential area may cause interference, in which case the
equipment user will be required to implement whatever measures
may be necessary to eliminate said interference at his/her own
expense. BALLY MANUFACTURING CORPORATION is in no way liable for
any additional expenses involved with elimination of
interference, or for any consequential damages or injuries.

BALLY Manufacturing Corporation maintains a

toll-free telephone number which can be used
to obtain service information for BALLY
manufactured equipment at your location.

1-800-HOT-SLOT

COPYRIGHT 1983 BY BALLY MFG. CORP. ALL RIGHTS RESERVED

NO PART OF THIS PUBLICATION MAY BE REPRODUCED BY ANY MECHANICAL,
PHOTOGRAPHIC, OR ELECTRONIC PROCESS, OR IN THE FORM OF A
PHONOGRAPHIC RECORDING, NOR MAY IT BE TRANSMITTED, OR OTHERWISE
COPIED FOR PUBLIC OR P RIVATE USE, WITHOUT PERMISS ION FROM THE
PUBLISHER.
FOR PERMISSION REQUESTS WRITE:

BALLY MANUFACTURING CORP.

90 0' LEARY DRIVE

BENSENVILLE, IL 60106
TABLE OF CONTENTS

1. INTRODUCTION ...................... ct ••••••• I1 •••••••••••••••••• 3

2. LOCATION AND SETUP

Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Installation • • . . . . . . • • . . . . • • . . . . . . • . . . . . . . . . . . . . . . . . . . . . . . . . 7
V0 I ume Ad jus tme n t .........•.•.••••••....•.•••............•.• 8
Setting Option Switches . • . . . . . . • . . . . • . • . . • . . . . . . . . . . . . . • • . . . 9

3. GAME OPERATION

Ready-to-Play Mode . . . • • • . . . . . • . . . • . . . . . . . . . . . • • . . . . . . . . . . . . 11
Play Mode • • . . . . . . . . . . . . . • • . . . . . . . . . . . . . . . • . . • • . . . . . . . . . . . . . 11
Bookkeeping Meters . . . . • • . . . . . . . . . • . . . . . . . . . . . . . • . . . . . . . . . . . 12
D i a g nos tic Mo de. . . . . • • . . . . . . . . . . • . . . . . . . . . • • . . . . . • . . . . . . . .. 1 3

4. TROUBLESHOOTING

Ge n era 1 S u g g est ion s . . . . . . . . . . . . . . . . . . • . . . . . . . . . . • . . . . . . . . . . 20

Ma 1 fun c t ion Co des . • . • . . . . • • . . . . . . . . • • • . . . . . . . • . . . . • . . . . . . . . 2 1
Glossary of Microprocessor Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
The Z - 8 0 CP U .....•....••.•...••..........••.......••......•. 2 3

5. MAINTENANCE AND REPAIR

Ge n era I C lea n i n g . . . • . . . . . . . . . . . . . . . . . • • . . . • . . . . . . . • . . . . . . . . 2 5
Co i n Ac c e p tor s • . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • . . . . . . . . 25
MechanicalCoinAcceptors •... :- ..••.•..••.•.....•........... 25
E I e c t ron i c Co i n Ac c e p tor s . • . . . • . . . • . . . • • . . . . . • . . . . • . . . . . . . . 2 7
Fuse Replacement . . . . • . . . . • • . . . . . . . . . • . • . . • . . . . . . . . • • . . . . . . . 28
Hopper Mechanism . • . . . . . . . . . . . . . • . . . . . . . . . . . . . . • . . . • . . . . . . . . 29
Printed Circuit Board Replacement •••....••.•....•.•........ 32
CRT (Cathode Ray Tube) Video Monitor Replacement .••........ 34
Recommended Spare Parts List ............................... 35

6. SCHEMATICS AND DIAGRAMS

List of Required Drawings .................................. 37

7. T.V. MONITOR MANUAL

Introduction . . . . . • . . . • • . . . . • . . . . . . . • • . . . . • . . . . . . . . • . . . . . . . • 41
S ymp t om D i a g nos is . . . • . . . . . . • • . . . . . . . • . . . . . . . . . . . . . . . . . . . . . . 41
Guide to Schematic Symbols ........••.•..•••.......•.....••• 44
Troubleshooting . . . . . . • • . . . . . . . . . . • . . . . • . . • . . . . • • . . . . . • . . . . • 46
Th eo r y 0 f Op era t i on .•...•........•..••.•.•...••....•....... 49
D iff ere n c e s Bet wee n Mo nit 0 r s .•••.•.••....•••....•.......•.. 5 3

1
LIST OF ILLUSTRATIONS

Page No.
Figure 1 , Overall View of Machine .............................. 3
Figure 2 , Overall View of Machine WI Front Door Open and
Ma j 0 r I t ems Ide n t i fie d ............................... 4
Figure 3, Connector Location Diagram ..................•........ 5
Figure 4, Lin e Co de P lug V0 I tag e Ch art ......................... 6
Figure 5, Volume Adjustment Pot Location ....................... 8
Figure 6, DIP Switch Location .................................. 9
Figure 7, DIP Switch Settings .................................. 9
Figure 8, DIP Swit c h Bit Numb e r s .............................. 1 0
Figure 9, Ready-to-Play Mode Display .......................... 11
Figure 10, P I a y Mo d e Dis P I a y . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 11
Figure 11 , Typical Feature Glass Pay Schedule .................. 11
Figure 12, P I a y Mo de Fin a I Dis P I a y ............................. 1 2
Figure 13 , Activation of Keyswitch ............................. 12
Figure 14, Boo k k e e pin g Me t e r Dis P I a y . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2
Figure 15, Re set Pus hbut ton L0 cat ion ........................... 13
Figure 16, Coin-In and Coin-Drop Switch Location ............... 13
Figure 17 , Diagnostic Mode Keypad Location ..................... 14
Figure 18, Pressing "TEST" on Keypad ........................... 14
Figure 19, Menu "B" Displayed .................................. 15
Figure 20, Menu "A" Input -Test Displayed ....................... 15
Figure 21, Me n u "A" Ou t put Te s t Dis P I aye d ...................... 15
Figure 22, Menu "A" Sound Board Test Displayed ................. 16
Figure 23, Menu "A" DIP Switch Input Test Displayed ............ 16
Figure 24, Menu "A" Align and Color Bar Test Displayed ......... 16
Figure 25 , Menu "A" PROM Test Displayed ........................ 17
Figure 26, Menu "B" Change Meter Values Displayed .............. 17
Figure 27 , Menu "B" Change Meter Values WI "NEW VALUE"
Displayed .•......................................... 17
Figure 28 , Menu "B" Change Meter Values WI "NEW VALUE"
Entered and Displayed ............................... 18
Figure 29, Menu "B" Hopper Coin Count Displayed ................ 18
Figure 30, Me n u "B" Ho Pper Te s t Dis P I aye d ...................... 18
Figure 31 , Menu "B" Pay Verification Test Displayed ............ 19
Figure 32, Menu "B" Reinit Win Record Displayed ................ 19
Figure 33 , Menu "B" Reel Test Displayed ........................ 19
Figure 34, Typical Malfunction Code Display .................... 21
Figure 35 , Z-80 CPU Pin Configuration ..•....................... 24
Figure 36, Coin Acceptor Mechanism Location .................... 25
Figure 37 , Remov i ng Co i n Acceptor .............................. 26
Figure 38, Cleaning Mechanical Coin Acceptor Magnet ............ 26
Figure 39 , Mechanical Coin Acceptor Lubrication ................ 26
Figure 40, Electronic Coin Acceptor Adjustment Location ........ 27
Figure 41, Fuse Location ....................................... 28
Figure 42, Hopper Rocker & Roller Assembly ..................... 30
Figure 43, Hopper Coin Count Microswitch ....................... 30
Figure 44, Ro c k e r Pin Set s crew ................................. 30
Figure 45, Hopper Level Sensing Microswitch .................... 31
Figure 46, Rocker & Roller Assembly Lubrication ................ 31
Figure 47, MCR II P.C.B. Rack ,Removal. ......................... 32
Figure 48, MCR I I P. C . B. Ra c k Dis ass emb I y ...................... 33
Figure 49, Remote Monitor Control Wiring Diagrams .............. 50

2
1. I NTRODUCTI ON

- CAUTION -
DO NOT CONNECT GAME LINE CORD PLUG
INTO POWER SOCKET UNTIL YOU HAVE
READ AND UNDERSTOOD SECTIONS 1, 2, &
3 OF THI S MANUAL.

NOTE: The w0 r d 11 use r( s ) 11 i s de fin e din t his man u a 1 a san y per son,
partnership, company, or corporation, and/or their legal
representatives, who own, operate, service, maintain, and
derive profit from their association with this equipment.
The word IIplayer" is defined in this manual as any person
who deposits money, tokens, or their equivalents into the
machine described in this manual for the purpose of playing
the game offered by the machine as defined by the rules and
odds set by the machine's user(s).

This manual covers the set-up, operation, and maintenance of the

BALLY Electronic Video Slot Machine, a single-player game
displaying animated images of conventional symbols on simulated,
slot-machine reels (see Fig. 1).

This machine features a large­

scale-integrated circuit (LSI)
microprocessor which is used to
control all machine functions. This
monolithic MOS device executes
stored instructions to determine
the structure and timing of game
fun c t ion s . A s elf - t est , d i a g nos tic
mode built into the control system
provides quick troubleshooting and
primary fault diagnosis using
monitor displays.

Control, address, and bi­

directional data busses provide
efficient communication links
between the CPU, I/O, Video
Ge n era tor, and Sou n d boa r d s .

Switches serve as an input network

while mechanical features are
solenoidactuated. Fig. 1

The use of solid-state microcomputer electronics and a television

display system results in a gaming device with less downtime,
greater reliability, and potential for custom options and
feature expansion.

The V-1297 is also wired and cabled for installation of a link

progressive jackpot system, which can be purchased from BALLY as
a factory option or added in the field at a later date. The V­
1297 is also compatible with other progressive systems.

3
2. LOCATION AND INSTALLATION

LIGHT TOWER ASSEMBLY _ _ _ _ _,,~r=:=-

( Optiona I)

FEATURE GLASS
SPEAKER(21

REEL WINDOW
GLASS
FAN
ASSEMBLY

i·,
COLOR VIDEO
L_-+-iHtWiffit-- MaN I TOR
ASSEM BLY

FUSE BRACKET
and FUSES

ATTENDANT
VITi~'-- KEY SWITCH

CORD SET

'"o'"
MCR2 CARD RACK ,
u
ASSEMBLY
COIN CUP

Fig. 2

4
2. LOCATION AND INSTALLATION

£-103 ­ 95 3 TER M.
BA R RIER ST R iP

-----,
AS-3130 ­ 1 SLA VE U NIT
BOAR D

1'-1--......
~ ~ ....
!
I AS-311B-'
AMP .
...

I" I
I
I

1 •,

\I

~ ! coo,
\L,.. /"

Fig. 3

5
2. LOCATION AND SETUP

INDICATES PIN #1

120 VAC
ALL BLUE WIRES

TERMI NAL KEY

WIRING SIDE

100 VAC
ALL WHITE WI RES

220 VAC
ALL YELLOW WI RES

110 VAC
ALL RED WIRES

240 VAC
ALL GREEN WIRES

Fig. 4

6
2. LOCATION AND SETUP
Inspection
1. Carefully remove the machine from its shipping crate.
2. Inspect the machine's exterior for any signs of damage.
Any scratches? Dents? Cracks?
Any broken controls?
Any broken glass or plastic?
Check the machine carefully and list any signs of damage.
3. Remove shipping cleats from bottom of cabinet.
4. Open the front door of the machine and inspect its interior
~ for any sign of damage and verify that all plug in connectors on
the wiring harness are firmly seated. Plug in any connectors
found loose (see Fig. 2, pg. 4 & Fig. 3, pg. 5).
CAUTION ­
DO NOT FORCE PLUGS ONTO CONNECTORS.
DO NOT FORCE PLUGS TOGETHER. ALL
CONNECTORS OR PLUGS ARE KEYED TO GO
TOGETHER ONLY WHEN ALL PINS ARE
PROPERLY ALIGNED.
If connectors won't go on easily and the keys are aligned, they
either don't belong there or are damaged.
5. Verify that all printed circuit boards (P.C.B.'s) are firmly
seated in their connectors (see Fig. 3, pg. 5). These connectors
are also keyed and can only fit onto the P.C.B.'s one way without
damage.
6. Check all major sub-assemblies and verify that they are
sec u reI y moun ted ( see call 0 u t s Fig. 2, Pg . 4) .
Some areas to check are:
Power Supply
T.V. Monitor
All P.C.B.'s and P.C.B. rack
Transformer Assemblies
7. Make a list of all problems that you cannot correct.
8. Call your distributor and/or service people about your problem
lis t.
Installation
Power Requirements:
Domestic - 100 V. to 120 V. @ 60Hz.
Foreign - 200 V. to 240 V. @ 50Hz. (requires transformer change)
Temperature:
32 to 100 degrees F (0 to 38 degrees C)

7
•
2. L CATION AND SETUP
1
Installation (cont'd)
Humi d it y:
Not over 95% relative.

Space Required:
22" x 20" (56 cm x 51 cm)

Machine Height:
48" (122 cm) 51" w/ optional tower light (130 cm)

This machine is designed to work properly on the available line

voltage. Check the line voltage with a meter, then check the
"line code plug" on the machine's power terminal board (see Fig.
3, pg. 5). Compare the machine's line code plug against the line
code plug voltage value chart in Figure 4. If the measured line
voltage and the machine's line code pll)g voltage match, the
machine can be plugged in.
If the measured line voltage and the line code plug voltage
differ by more than minus 15% or plus 10%, DO NOT PLUG IN THE
MACHINE! Call the distributor and/or service personnel to correct
the problem and prevent possible damage to the machine.
Set the main power toggle switch to the "ON" position. A series
of 6 tones sounds and the start-up PROM test is displayed on the
monitor before the machine enters the Ready-to-Play Mode. The
vertical and horizontal placement of the monitor display can be
adjusted using the 2 pots located near the main power switch.
V01ume Adjustment
Open front door of machine using
key provided. The audio control
pot is located on the sound board
(top board in the card rack) and
is adjusted by sliding the card
rack outward until the control pot
is visible (see Fig. 5). Turn the
adjustment wheel on the control
pot until the sound volume is at
the desired level, then slide card
rack back into position and close
front door.
Fig. 5

8
2. LOCATION AND SETUP

Setting Option Switches

The DIP switch package located on

the sound board (see Fig. 6) has 10
single-throw switches which allow a
selection of game features and
other functions. The unused
switches allow the addition of
other machine features in the
future.

Typical DIP switch settings and the

functions they control are shown in
Figure 7. Switch #10 must always be
in the "RUN" position as shown.

When switch #2 is in the "OFF"

position, no music will accompany Fig. 6
a payout, but other game sounds are
not affected.

Switch number 3 controls novelty

animation features in the game LEFT RIGHT
display such as cherries "popping", ~zo

bel I c I a p per s "c I an gin g ", and BAR ~- NOT USED

symbols flashing when higher MUSIC ON ~N MUSIC OFF
win n i n g com bin a t ion soc cur. I f NOVELTY ON CJ:I VI NOVELTY OFF
switch #3 is "ON", animation is MACH.&ATT. [];I .,. ATTNDNT. ONLY
enabled, set to "OFF", animation is ~UI NOT USED
disabled. CF.:I 01 NOT USED
IKE $ CLJ ~ QUARTER
When a winning combination requires
a payout larger than hopper GREEN c::::::a CD BLUE
[];I IQ NOT USED
capacity, the machine will normally
"lock-up" and wait for an attendant RUN ~o WAIT
to make the payout and reset the
machine. As an alternative to this, Fig. 7
Switch #4 determines whether or not
the machine prepays a certain amount of ' payouts larger than
hopper capacity. If the switch is set to "MACH. & ATT.", the
machine pays a pre-determined amount, then waits for attendant to
pay balance and reset machine. If switch is set to "ATTNDNT.
ONLY", the machine makes no payout on large winners, requiring
attendant to pay entire amount and reset machine.

Switch #7 selects machine coinage between Eisenhower dollars and

other coins.

Switch #8 selects either green or blue as the display background

color.

9
 2. LOCATION AND SETUP
Setting Option Switches (cont'd)

Switch operation can be checked by SWITCH BIT NO.

entering the Diagnostic Mode's
"DIP SWITCH INPUT TEST" in which 1 01
the monitor will display the bit 2 02
status of eight DIP switch 3 04
positions (see "INPUT TEST", pg.
14). Figure 8 depicts bit vs. 4 08
switch numbers for this particular 5 10
application. 6 20
7 40
8 80
9 N/A
10 N/A

Fig. 8

f
I

.."
.."

""

10
3. GAME OPERATION
Ready-to-Play Mode
The Ready-to-Play Mode is where a
player begins operation of the
machine. When in this mode, the
machine display is as shown in Fig.
9. The video monitor displays the
final reel positions of the last
game, the number of coins bet, and
the amount won (paid out), if any.

Play Mode

The machine enters the Play Mode

when a player inserts the first
coin (see Fig.10). This illuminates
the backlit "COIN ACCEPTED" message
located on the reel glass, and Fig. 9
causes the center payline (#1) to
change color. Player may now play
game by pulling handle or increase
bet by inserting more coins, up to
the I imi t accepted by the game.
Each additional coin causes one
more payline to change color and
become ac t i ve.

Each additional coin inserted

causes the corresponding pay­
schedule column on the feature
g I as s to i I I u m i nate (see Fig. 11).
Any coins inserted after the
coining limit is reached are
returned to the player. If an extra Fig. 10
coin should get past before the
coin lockout is in place, it will
be credited toward the next game.
Player may pull handle at any time
after inserting the first coin. The
pulling of the handle causes the
reel symbols to cock back. When
handle travel limit is reaChed,
reels appear to begin to "spin".
A I Ire e I s beg i n t 0 s pin
simultaneously, then stop from
left to right at 1/3 second (330ms)
intervals. The reels appear to spin
at a steady rate for approximately
1.5 seconds, then decelerate Fig. 11
quickly for another 0.5 second. The
spin ends with a damped "bounce" as
the reels stop.

11
3. GAME OPERATION
Play Mode (cont'd)

If the reels stop in a winning

combination, (see Fig. 12) the
machine pays the player from the
hopper or summons attendant via the
optional tower light for payment of
large winners. Hopper payouts are
recorded on the monitor displayed
win meter, which counts each coin
paid up to the total winnings
amount. The winning payline is
flashed during the payout and a
tune is played if winnings are over
a pre- determined amount. The game
then returns to the Ready-to-Play
Mode.
Fig. 12
For operating information on
machines equipped with the optional
Link Progressive System, see manual
FO-850-7, trLINK PROGRESS IVE SYSTEM
OPERATING MANUAL".

Bookkeeping Meters

The bookkeeping meters are

displayed whenever the key switch
on the side of the machine is
actuated (see Fig. 13) The
bookkeeping meters display coin
counts and number of games played.
Last game played and win record Fig. 13
displays can be chosen by manually
actuating the "CHANGE OR SERVICE"
pushbuttononthefrontdoor.

The coin-count meters display the

following: (seeFig. 14)
Ml!!.T~
~ I'1::HMTR
CO I N - IN (CN - IN) - Co ins ins e r ted CN-rN eel e 11 ele
CN-OUT ee
into machine. CN-ORp
30e Ie.,
0
COIN-OUT (CN-OUT) Coins paid HOPPER ee
U!Ie

out of hopper. (!!lAMES

I!!!IZ!!II ~1 I!!! I
COIN-DROP (CN-DRP)- Inserted coins
sent to coin drop.
HOPPER- Inserted coins sent to
'­
hopper or current hopper contents.
GAMES- Number of games played
since last reset of meter.
Fig. 14

12
3. GAME OPERATION
Bookkeeping Meters (cont'd)

The I1METERSI1 column counts from 0-999,999 and resets at 1,000,000

to zero (0).

The I1PERMTR" (permanent meter) column counts increment in

parallel with the I1METERSl1 column, are also 6 digit, and reset at
1,000,000.

The last column, "MCHMTR" (mechanics meter), is provided to

record test play during maintenance or repair without disturbing
the amounts stored in the 1fIVIETERS" and I1PERMTR I1 columns.

The condition of the front door determines which meters will

increment. If the first coin of a game is inserted with the door
closed, all coins subsequently inserted for that game will
increment the values in the I1METERS I1 and I1PERMTR l1 columns. If the
first coin is inserted with the door open, all coins subsequently
inserted for that game will increment the I1MCHMTR l1 column values,
even if the door is closed after the first coin is inserted.

Diagnostic Mode

The Diagnostic Mode programmed into

the machine software can assist in
the troubleshooting of machine
operating difficulties or component
failures.

This mode is entered by opening the

front door of the machine and
pressing the reset button located
on the hopper (see Fig. 15). One of
the ~ diagnostic menus will now be
displayed on the monitor (see Fig.
19, pg. 15). To select a menu item, Fig. 15
manually actuate the coin-in switch
to position the item selection
cursor (pointer) next to the
desired item. Manually actuate the
coin-drop switch to execute the
selected function (see Fig. 16). If
the item is not of the self­
returning type, depress the reset
button to return to the menu. To
return to normal operation from the
menu, depress reset button. The
following section contains detailed
des c rip t ion s 0 f the v a rio u s
diagnostic mode items and their
use.
Fig. 16

13
3. GAME OPERATION

Diagnostic Mode (cont'd)

The optional touch-type keypad

1 0 cat e don the MCR I I car d r a c k
ItMother Board" (see Fig. 17)
increases the versatility of the
Electronic Video Slot Machine's
built-in Diagnostic Mode. The
keypad allows the operator to move
the item selection cursor up as
well as down, execute test
functions, and enter desired
bookkeeping meter values directly
into the microprocessor memory.
Pressing the "TEST" pad (see Fig.
18) causes one of the two
diagnostic test menus to be Fig. 17
displayed on the video monitor. To
select a menu item, move the cursor
using the !!BIt (up) & It Cit (down)
pads. When the cursor is properly
positioned, press "TEST!! to execute
the the selected item. Pressing
"GAME It once returns the main Menu,
. pressing !!GAMEIt again returns the
machine to normal operation. The
following instructions detail the
use of the keypad wi th each of the
diagnostic mode menu items.

NOTE: If the machine is not

equipped with a keypad, substitute Fig. 18
the following:

1. "CO I N - IN" s wit c h for " B" (u p) & "C" (d 0 w n ). Not e t hat c 0 i n - i n
switch only moves cursor down.

2. "RESETIt button for ItTESTIt pad to enter the diagnostic mode.

3. "COIN-DROP" switch for ItTEST" pad to execute selected menu

items.

4. "RESET It button for "GAMEIt pad to return game to normal

operation.

NOTE: Numerical values cannot be entered into the machine memory

without using a keypad.

14
3. GAME OPERATION

Diagnostic Mode (cont'd)

MENU A:

"GO TO MENU B" - Pr es s "TEST" and

monitor displays Menu B (see
Fig. 19).

" IN P UT T EST" - M0 nit 0 r dis P lay s 5

eight-bit input ports (00,01,02,24,
2C,28). By manually actuating
various input switches and
observing their bit status on the
monitor (see Fig. 20) it is
possible to verify proper input
operation. The monitor also
displays the name of the input
ope rat ion ("DROP HIT" 0 r "DROP REV'
etc. )

"OUTPUT TEST" - Mon i tor displays

the "OUTPUT TEST MENU" (see Fig.
21). The cursor appears next to
"AUTO TEST" each time this item is
entered. Press "TEST" again and the
machine will automatically actuate
e a c h 0 u t put i n t h e s e q'u e n c e
displayed on the "OUTPUT TEST MENU"
the n ret urn the cur so r t o " AUTO
TEST". Outputs can be individually
checked by positioning the cursor
next to the desired output and
pressing "TEST". Output will be
actuated once, and can be actuated
aga in by pre s s i ng"TEST".

Fig. 21

15
3. GAME OPERATION

Diagnostic Mode (cont'd)

"SOUND BOARD TEST" Monitor

displays game copyright date, model
number and payout percentage. The
test then causes 4 Hex values
( 0 0 , F F , 5 5 , AA) t 0 b e sen t toe a c h 0 f
the 4 sound board input ports
(IF,lE,lD,lC) and wait for those
values to return from sound-board
output port 07. After each of the 4
test values is received, the
monitor displays a "RECEIVED"
message next to each value. If any
value is not returned from port 07,
a "NOT RECEIVED" message is
displayed next to that value and
the test stops at that point (see Fig. 22
Fig. 22).

Next, an internal RAM and ROM check

is performed. If a defect exists in
the RAM or ROM's 0 through 3, the
defective I.C. is identified on the
monitor display. If no defects are
found, the monitor displays "TEST
COMPLETE" and the test self-
terminates and returns to Menu A.

"DIP SWITCH INPUT TEST" - Mon i tor

displays the bit status of eight of
the switch positions on the sound
I/O board DIP switch (see Fig. 23).
Changing the positions of the
individual switches changes the bit Fig. 23
status displayed on the monitor,
verifying that the switch bit
status has changed to the correct
value.

"ALIGN AND COLOR BAR TEST"

Monitor displays a blue field with
a white alignment grid superimposed
(see Fig. 24). Display changes once
each time "TEST" is pressed, and
monitor will display each of the
primary colors (red, blue, and
green) with or without an alignment
grid.

Fig. 24

16
3. GAME OPERATION

Diagnostic Mode (cont'd)

"PROM TEST" - Monitor displays the

model number, payout percentage,
and an "OK" or "NOT OK" message for
each PROM, 0 through 6 (see Fig.
25). Test then self-terminates and
returns to Menu A.

!!OPM (output map) TEST" - Not

intended for field use. This item
can be entered by pressing !!TEST!!.
The monitor will either display the
5 byte values sent to the output
ports listed on the right side of
the display or !!NO OPM". In either
case, no change can be made in the
display.
Fig. 25
!!BURN-IN TEST!! If !!TEST!! is
pressed, monitor displays !!BURN-IN
TEST NOT IMPLEMENTED".

MENU B:

!!GO TO MENU All - Press IITESTII and

monitor displays Menu ~

!!CHANGE METER VALUESII - Mon i tor

displays a 3 column set of book­
keep i ng met e r s (IIMETERS!!, IIPERMTR II ,
"MCHMTR II ) identical to those
displayed when the key switch is
actuated (see Fig. 26).
Any of the numerical values in the
"METERS!! or !!MCHMTR!! columns can be
changed after this mode is entered.
Enter the desired new value using
the numerical portion of the keypad
and monitor displays the new value
below the meter columns (see Fig.
27). Position the cursor at the
desired location and press !!ENTER!!.
The new value appears at that
location, the cursor moves down
one line, and monitor continues to
display the new value (see Fig. 28,
pg.18). If it is desired to enter
the new value at the next location,
press !!ENTERII again. Each time
!!ENTER!! is pressed without changing
to a different new value or
returning to game, the displayed Fig. 27

17
3. GAME OPERATION

Diagnostic Mode (cont'd)

new value is entered, and the

cursor moves down one I ine. To
enter a different new value,
position the cursor, use the
numeric pads, and press "ENTER".
The "PERMTR" column values are
intended as a semi-permanent record
record of machine operation and
they cannot be modified unless an
emulator is connected to a keypad­
equipped "Mother Board" on the
front of the card rack. With the
emulator connected, the byte at
location 7000 (Hex) must be set to
TRUE (FF Hex) to enable "PERMTR"
column to be reset. Once this
change has been performed, the
cursor will stop at each location
i nth e " P E RMT R " col u m n . The
"PERMTR" values remain "reset
enabled" while the machine is in
the emulator modi fied "CHANGE METER
VALUES" function. Upon exiting this
function, location 7000 is reset to
FALSE and the cursor reverts back
to its regular function.
All meter values (bookkeeping, win
record, and last game) are stored
in safe RAM so that no loss of
meter information occurs if machine Fig. 29
is shutdown or in the event of
powe r fa i I u r e .

"HOPPER COIN mUNT" - Hopper motor

energizes and pays out all coins in
the hopper. Monitor displays the
count, incrementing one number with
each coin paid. Hopper shuts down
automatically when empty and
monitor displays final count (see
Fig. 29)

"HOPPER TEST" - Hopper motor

energizes, pays out 25 coins and
shuts down. Monitor displays count
as well as minimum and maximum
count switch closure times, rounded
to the nearest multiple of 16
milliseconds. An average of all Fig. 30
counts is also displayed (see Fig.
30) .
3. GAME OPERATION

Diagnostic Mode (cont'd)

"PAY VERIFICATION"-Mon i tor displays
results of production line pay
verification test. This is shown in
a four-column format, with the
numbers displayed in the first
column relating to winning
combinations (i.e., l=cherry­
cherry-cherry, 2=bar-cherry-cherry,
etc.). The second column number
equals how many times a given
winning combination occurred during
the test, with the third column
indicating how many coins would be
paid out for such a winning
combination based on a one-coin
bet. The fourth column contains the Fig. 31
total number of coins paid out for
the total number of times a given
winning combination occurred during
the test (see Fig. 31).
"REINIT WIN RECORD" - Monitor
displays win record meter with all
combination counts set to zero (see
Fig. 32).
"REEL TEST" - Monitor displays all
reels in slow motion so that all
symbols on all reels can be checked
(see Fig. 33).
The "UNUSED" items listed on Menu B
have no function or test that can Fig. 32
be performed at this time.

Fig. 33

19
4. TROUBLESHOOTI NG
General Suggestions
Most common machine problems occur in harness components such as
the coin acceptor, player controls, interconnecting wiring, etc.
The television monitor and microprocessor computer can also fail
or malfunction, but this occurs infrequently. Procedures for
troubleshooting the video monitor can be found in Section 7, "TV
MON ITOR MANUAL".
The microprocessor-based computer is a complex device with great
numbers of different circuits. Some basic Z-80 CPU information is
supplied in this manual to assist you in locating a problem in
the CPU board. It is not recommended that you attempt to isolate
the faulty component on a defective P.C.B., as this requires
specialized equipment. Machine downtime is greatly reduced if the
defective P.C.B. is replaced as a whole from the stock suggested
by the Recommended Spare Parts List (see pg. 35) and the
defective P.C.B. returned to your BALLY distributor.
Your machine must have the correct line voltage to operate
properly. If the line voltage drops 15% below line-code plug
value, the machine will shutdown.
Low line voltage may have many causes, some of which are related
to electric utility output capacity and peak demand. If the
malfunction seems related to a certain time of day, this may be a
factor. A large electrical load (such as an air conditioner) or
poor connections in location wiring, sockets, or game line cord
can also cause this problem. Cold-solder joints in the harness,
especially in the termination board connections or fuse block,
can be suspected.
Ma chi n e 's are s 0 met i me sina d v e r ten t I Y con n e c ted t 0 lin e s h a v i n g
d i mne r r he 0 s tat sin s t a I led to dim I i g h t s . V0 I tag e a v a i I a b I e for
machine operation fluctuates as the dimmer position is changed.
-WARN ING­
HAZARDOUS VOLTAGES ARE PRESENT AT
THE POINTS BEING CHECKED IN THE
FOLLOWING TESTS. TAKE ALL NECESSARY
PRECAUTIONS AGAINST ELECTRIC SHOCK.
Check for correct line voltage using a VOM (Volt/Ohm Meter). Set
the VOM to 250 VAC and insert the probes into the wall socket.
If wall receptacle voltage is correct, check the machine's
transformer primary connections. If the VOM does not obtain a
reading approximating line voltage, examine the solder joints on
the transformer and fuse block. If the VOM does give a correct
voltage reading, the problem must be in the transformer, harness
connections, or P.C . B. power supply.
Check the transformer secondaries with the VOM set to 50 VAC and

20
4 . T RO UBLESHOOTING

General Suggestions (cont'd)

correlate the readings with the schematic diagram. Be certain to
check transformer ground potential as well, particularly if a
"hum bar" is present on the monitor screen. -,

Other harness problems includes blowing fuses and malfunctioning

controls. If these are suspected, first try inserting a new fuse,
as old fuses may blow unexpectedly due to age. If the new fuse
also blows, proceed to look for a short in the circuit.
Turn the power off and disconnect the devices that may be causing
the problem, such as the monitor, transformer, and P.C.B. rack.
Pull all connectors off each device, but do not allow connectors
to touch. If necessary, insulate them with electrical tape.
Connect the YOM across the terminals of the fuse block and set it
to one of the resistance scales before turning on power. This
will prevent the blowing of fuses while the circuits are checked.
Restore power and check the YOM reading. If the reading indicates
that the short is now no longer present, begin reconnecting
devices one at a time until the short returns. The last device
reconnected is at fault. If a short or malfunction is suspected
in the door, insert and lamp, or hopper assembly, they can be
disconnected and inspected individually. If the YOM reads a short
even after all devices have been disconnected, the fault lies
within the harness itself and patient exploration will be
required to reveal its location. First, carefully examine all
harness wiring, checking for burned insulation, coins across
connections, and incorrect terminal contact. If necessary, use
the YOM to check each wire.
If a feature that is switch operated (front panel switches, etc.)
does not function, use the Diagnostic Mode "INPUT TEST" (Section
3, pg. 15) to verify proper switch operation. Further tests can
be per for me d wit h a YOM i f des ire d. 1ft h e s wit chi s de f e c t i ve ,
replace it.
Malfunction Codes
During normal operation, the coin
input, coin drop, and coin output
(hopper), are constantly monitored.
Any problem in these areas causes
machine operation to stop, the
optional tower light to illuminate,
and the nature of the problem to be
displayed on the video monitor.
When the front door is opened to
remedy the problem, a "CLEAR TILT
WITH CLEAR KEY" message becomes
visible at the top of the monitor
screen (see Fig. 34). After the Fig. 34

21
4. TROUBLESHOOTING
Malfunction Codes (cont'd)

problem has been corrected, pressing the "KEYBD. CLR." pad on the
Diagnostic Mode keypad will remove the malfunction-code display
from the monitor and return the machine to normal operation. The
5 malfunction codes that can be displayed are:

COIN-IN JAM - Caused by a coin jamming in the vicinity of the

coin-in switch, forcing it to remain open for over 120 ms. This
function also protects against slugs and "stringing". Attendant
required to open door, clear jam, and return machine to normal
operation.

CO I N -OUT JAM - Ca use d by a co in j amm i ng in the vic i nit y 0 f the

coin-out switch, forcing it to remain open for over 480 ms. This
detects coin jams on the hopper (coin counting) coin-out switch.
Attendant required to open door, clear jam, and return machine
to normal operation.

HOPPER DRY - Caused by coin-out switch not sensing any coins for
7 seconds. Usually caused when no coins or tokens are available
in hopper for payout. Also caused by a faul ty hopper or faul ty
coin-out switch. Attendant required to open door, fill hopper
or notify service personnel, and return machine to normal
operation if possible.

OVER PAY - Caused by actuation of the coin-out switch at the

wrong stage in the game. Protects against hopper tampering or a
slow stopping hopper. Attendant required to open door, check
hopper and/or payout, notify service personnel if ne cessary, and
return machine to normal operation.

Glossary of Microprocessor Terms

MICROPROCESSOR - One of several microc i rcui ts that per form the

function of a computer CPU. Sections of the circuit have
arithmetic and comparative functions that perform computations
and execute instructions. The microprocessor section of a
microcomputer can be on one or several integrated circuit chips.

CPU - Central Processing Unit. A computer system's "brain",

whose arithmetic, control, and logic elements direct functions
and perform computations.

EPROM - Erasable, Programmable Read-Only Memory. Operates in the

same manner as a PROM except that user can also erase any
program entered using an ultraviolet light bath. Can be
reprogrammed as often as necessary during program design and
development, then replaced by ROM for mass production.

22
4. TROUBLESHOOTING
Glossary of Microprocessor Terms (cont'd)

ROM - Read-Only Memory. The binary on-off bit pattern containing

the program is set into the ROM during manufacture, usually as
part of the last metal layer placed onto the integrated circuit.
ROM's are not erasable and can contain up to 32,000 bits of data
which serve as the microprocessor's instructions.

RAM - Random Access Memory. Stores binary data bits as

electrical charges in transistor memory cells. Can be read or
mod i fie d t h r 0 ugh the CP U. S tor e sin put ins t r u c t ion s, res u Its,
and other constantly changed data. Erased when power is removed
unless a "safe RAM" battery powered backup is provided.
LSI - Large Scale Integration. Formation of hundreds or
thousands of gate circuits on semiconductor chips. Very Large
Scale Integration (VLSI) involves microcircuits with the
greatest component density.

MOS Metal Oxide Semiconductor. A layered construction

technique for integrated circuits that achieves the high
component densities required by LSI and VLSI. Variations in MOS
chip structures create circuits with high speed and low power
requirements, or other design advantages. Static electricity
will damage an MOS chip.

The Z-80 CPU

The term "microcomputer" has been used to descr... ibe many different
types of small calculating or controlling devices in the last few
years. With the advent of MOS LSI technology, however, it has
become possible to construct small, powerful computers using only
a few MOS LSI components.

The Zilog Z-80 family of I.C. components used in this machine can
be used with any type of standard semiconductor memory to create
computer systems with many different capabilities.

As used in this machine, the Z-80 microcomputer consists of three

parts:
1. CPU (Central Processing Unit)
2. Memory (ROM, PROM, EPROM, and/or RAM)
3. Interface circuits to peripheral devices (I/O circuits)

The CPU is the heart of the system. Its function is to obtain

instructions from th~ memory and perform the desired operations.
The memory contains instructions for use by the CPU and other
d a tao n gam est a t us. I n a t y pic a lin s t r u c t ion seq u e n c e the CP U
will read data from a specific peripheral device, store it in the
memory, check parity, and write data out to another peripheral
device.

The 8-bit arithmetic and logic instructions of the CPU are

23
4. T ROUBLESHOOTING
The Z-80 CPU (cont'd)
e x e cut e din the Ar i t h met i c Log i c Un i t (ALU) . I n t ern a I I Y, the ALU
communicates with the general purpose registers and the external
data bus on the internal data bus. The functions performed by the
ALU include:
Add Left or right shifts or rotations
(arithmetic and logical)
Subtract Increment
Logical AND Decrement
Logical OR Set bit
Logical Exclusive OR Reset bit
Compare Test bit
As each instruction is received from the memory, it is placed in
the instruction register and decoded. The control section
performs this function and then generates all of the control
signals necessary to read or write data from or to the registers,
control the ALU, and provide all required external control
signals.
The Z-80 CPU is packaged in an industry-standard 40 pin dual-in­
line package. The I/O pins are shown in Fig. 35 and the function
of each is described.

r-------ADDRESS B u s - - - - - - -....I~DATA BUS~

,..,t t"" ",, ~ ,t .,

®®®®®@0CD ®®CD®
@@@@®CD(DG) ®CD 0®

®® @ ® ®
® ®® @@@@ ®® 0®

Fig. 35

24
5. MAl NTENANCE AND REPAI R

Your BALLY Electronic Video Slot Machine requires regular

maintenance to keep it in proper working order. Clean, well
maintained machines attract more players and earn higher profits.

The most important part of a regular maintenance program is the

machine's built-in Diagnostic Mode, which should be checked
whenever the contents of the coin box are collected or the
exterior of the machine is cleaned, whichever occurs most
frequently. See Section 3, pg. 13 for detailed instructions on
the Diagnostic Mode.

General Cleaning

The outside of the machine cabinet and exterior metal trim can be
cleaned with any non-abrasive household cleaner. The front of the
picture tube and both sides of all other glass or plastic on or
in the machine MUST be cleaned with an anti-static type cleaner
ONLY!

Coin Acceptors

Each machine is equipped with one coin acceptor designed to

reject coins of incorrect weight, thickness, diameter, or
metallic content. Two different coin acceptors are supplied, one
electronic, the other mechanical. Both use the same mounting
hardware and location. Each type has different maintenance
requirements, which are described in the following sections.

Mechanical Coin Acceptors

Many machine operating problems are

related directly to . the coin
acceptor, which is often subjected
to spilled beverages, food, and
other foreign matter. This is a
greater problem with mechanical
acceptors, which must be removed
and cleaned regularly to avoid game
stoppage due to coin jams and
relatedmalfunctions.
To clean the coin acceptor, proceed
as follows:
Fig. 36
1. Open the front door using key
provided and locate coin acceptor
mechanism (see Fig. 2, pg. 4, &
Fig. 36). Turn off main power
switch.

25
5. MAl NTENANCE AND REPAI R

Mechanical Coin Acceptor (cont'd)

2. Lift the spring loaded latches

from the top of the coin acceptor
and pull the top of the acceptor
away from its housing while holding
the latches above the acceptor
studs (see Fig. 37).

3. Release the latches and lift the

coin acceptor out.

4. Open the coin acceptor gate and

remove all metal debris from magnet
by applying the blade of a
screwdriver along the edges of the Fig. 37
rna g net (s e e Fig. 38).
GA TE OP EN • • •
5. Clean off all visible residue CLEAN MAGNET
BY ORAGGING
and foreign matter from coin SCREWORIVER

acceptor using a brush. Clean the

cradle pivot, bushings,and counter­
weight with a soft pipe cleaner. To
complete the job, clean the coin
acceptor using the special non­
residue cleaner available from your
distr ibutor.

6. Lubricate the cradle pivot pin,

bushing, and counterweight pivot
with a small amount of powdered
graphite. DO NOT allow lubricant to
reach any parts that will contact
coins (see Fig. 39). Fig. 38
-CAUTION­
NEVER USE OIL TO LUBRICATE COIN
ACCEPTOR.
APPLY GRA PHITE

7. Clear any obstructions from the ON L Y

A T TH£ S E ( 2) ~~-.J::::""'::;i((
coin chute. PI VO T PO INT S

8. Install coin acceptor by

inserting studs on the bottom of
the acceptor into the slots in the
housing. Carefully push the top of
the acceptor into position until
the retaining latches snap into
place and the acceptor is firmly
held. Fig. 39
9. Plug game line cord into wall socket, turn main power on, and
close front door. Machine is now ready for normal operation.

26
5. MAINT ENANCE AND REPAIR

Electronic Coin Acceptor

Electronic coin acceptors operate
in a fashion similar to metal
detectors. Only one moving part is
used, the solenoid actuated coin
lockout. These coin acceptors have
no mechanisms that can jam or clog
with foreign matter. However, they
do require sensitivity adjustments
to insure that they operate
correctly. This adjustment is
performedas follows
1.Remove the coin acceptor from
its mounting in the front door (see
Fig. 37, pg. 26). Fig. 40
2. Locate the adjustment pot and LED on the coin acceptor (see
Fig. 40).
3. Pass an acceptable coin through the unit while observing the
LED. If the LED flashes and the coin is rejected, turn the pot
clockwise. Repeat this procedure, turning the pot 1/4 turn at a
time, until the LED stops flashing and the coin is accepted.
4. If coin is rejected and LED does not flash, turn pot 1/4 turn
in a counter-clockwise direction. Repeat this procedure until
coins are accepted. If LED begins to flash during this procedure,
turn pot back clockwise until LED no longer flashes.
5. Within approximately 1 (one) full turn of the pot all good
coins will be accepted. The optimum setting for most coins would
be in the center of this turn.
6. Re-install coin acceptor in reverse of removal procedure.
It is possible to tune the acceptor for optimal rejection of
certain types of slugs. To reduce lead slugging on dollar
machines, turn the pot slightly clockwise from its "normal"
setting. To increase coin feeding speed, adjust pot slightly
counter-clockwise from normal. It is suggested that the unit be
tuned for marginal accept/reject rates on the third coin of a
three coin fast feed.
Before placing machine into normal operation, check coin acceptor
tuning with a variety of coins to be certain that average coins
are not rejected.
NOTE: Machines presently equipped with mechanical coin acceptors
can be field retrofitted with electronic acceptors if so desired.
Contact BALLY distributing or BALLY Mfg. for a copy of
publication FO-850-5, "COIN ACCEPTOR CONVERSION".

27
5. MAI NT ENANCE AND REPAIR

Fuse Replacement
The machine contains 4 fuses,3 of which are located on the back
wall of the cabinet liner, slightly below the card rack. The
fourth fuse is located on the front of the hopper motor case (see
Fig. 41). The fuses are housed in standard threaded holders.
If it is suspected that a fuse has blown, disconnect machine from
wall socket, open front door, and turn off main power switch
before inspecting fuses.
-WARN ING­
MACHINE CIRCUITRY INCLUDES A
TELEVISION PICTURE TUBE AND VARIOUS
CAPACITORS WHICH STORE HAZARDOUS
CHARGES. GAME USER MUST PROVIDE ALL
PROPER PRECAUTIONS AGAINST ELECTRIC
SHOCK TO PERSONNEL SERVICING THIS
MACHINE.

Fig. 41
Replace the blown fuse(s), plug the machine's line cord into a
wall socket, and turn on the main power switch.
-WARNING­
REPLACE A BLOWN FUSE WITH ONE OF
IDENTICAL SIZE AND RATING. NEVER USE
FUSES WITH AN AMPERAGE RATING HIGHER
THAN THAT STATED IN THE ELECTRICAL
DRAWINGS CONTAINED IN THIS MANUAL.

28
5. MAINTENANCE AND REPAIR

Fuse Replacement (cont'd)

Test operate machine and if fuse blows again, disconn ec t game
line cord from wall socket,open front door,turn off main power
switch, and locate the cause of the blown fuse. Replace all
components which show any evidence of having been damaged by a
short circuit.
Hopper Mechanism
The hopper unit is virtually identical to those used on earlier
models of BALLY gaming equipment.
The hopper's 3 states of control are determined by the CPU as
follows:
1. "OFF" in which the hopper lines are Disable LOW, Enable HIGH.
2. "TRANSITION" in which the hopper lines are Disable HIGH,
Enable LOW.
3. liON II in which the hopper I ines are Disable HIGH, Enable HIGH.
The hopper drive motor is energized in the "ON" state and coins
are dispensed. As each coin is dispensed, it lifts the roller
mechanism, which actuates a microswitch, pulsing the I/O input to
change logic levels and record a one coin payout inthe machine's
memory.
As previously mentioned, the hopper motor and control circuitry
is protected by a 5 amp fuse located on the hopper motor case. A
neon-bulb indicator illuminates when the hopper fuse is blown.
To remove the hopper unit,open the front door and remove the
coin payout cup.The hopper can now be removed by grasping the
handle on the hopper unit and pulling it forward, sliding the
hopper out of the game.
Clean the hopper assembly with a degreaser or contact cleaner and
wipe off all residue with a clean cloth.
The following are hopper maintenance operations which must be
performed on a regular basis with frequency dictated by machine
usage. These operations can also be performed whenever hopper
problems are experienced.

29
5. MAl NTENANCE AND REPAI R

Hopper Mechanism (cont'd)

Check the hopper kni fe (see Fig.

42). The forward edge must press
against the pinwheel and touch the REAR LEG

edge of the shelf wheel. No coin ROCKER a

ASSEMBLY
ROLLER

should be able to wedge itself

between the hopper knife and pin
wheel while being dispensed. DO NOT ROLLER

apply grease or oil to this or any

other area which contacts coins.

The hopper is equipped with a

microswitch which is used to detect
coins being paid out by the hopper.
The mechanism which trips the
microswitch is designed to provide Fig. 42
a variable time delay between coin
detection and actuation of the
microswitch (see Fig. 43). Check ROCKE" a ROLLER
AOJUSTMENT SC REW • • • AOJUST soTHAT

for positive microswitch actuation SCAEW IS lJ '-2­ ..... x.

r"OIll BLADE 0' • ••

with a coin directly beneath the

roller. Verify that microswitch is
open with no coin beneath roller.
To adjust the time delay, loosen
I
the locknut on the rocker & roller
adjustment screw and turn the screw
until it is the required distance
from the microswitch actuator blade
to provide the desired time delay.
Tighten locknut after adjustment is Fig. 43
finished.
Tighten the rocker pin set screw
until all play is taken up, then
P I NWHEEL
I
loosen screw 1/4 turn (see Fig.44).
Rotate the pin wheel manually. It
must turn without binding (set
screw overtightened) or wobbling
(set screw too loose).

Fig. 44

II

30
s. MAINTENANCE AND REPAIR

Hopper Mechanism (cont'd)

The hopper counterbalance must be

adjusted with the desired level
(number) of coins in the hopper.
Slowly turn the set screw counter­
clockwise until the microswitch
clicks into the "down" position. CD
Tl GHT£H SET SCR fW
( l urn Clocll . i.. )
The hopper is now set at the ••• UNTI L ACTUATO R
ON M IC AO SW ITCH
I S IN TH E UP POSI TI ON
desired capacity (see Fig. 45). I J us ! louch in 9 head
of Ad j. Sc r•• I

Lightly grease both ends of the (!) NOW BACK

SE T SCRE W (Count . r­
orf

rocker & roller pivot pin a nd S(T SCR EW

clock .. ise I UNTI L
M' CRO SWI TCH CLICKS
I NTO TH E DO WN
lightly oil rocker & roller TE N$ION SPRIN G
POS ITION

shoulder pin. DO NOT allow grease

or oil to reach parts which contact Fig. 45
coins (seeFig. 46).

~~T~O~~~~ ~~~ IN l
RO LLER ASS EMBLY

Fig. 46

31
5. MAI NTENANCE AND REPAIR
Printed Circuit Board Replacement
If it is suspected that a printed circuit board component has
failed or it becomes necessary to test P.C.B. components, the
ent i re rack holding the P.C.B.ls can be removed from the machine
as follows:

1. Open the front door, turn off main power switch, and
disconnect game line cord from wall socket.

2. Remove the front screw from the card retainer bracket and lift
bracket upward unt i I i t clears the card rack (see Fig. 47).

•
Fig. 47
3.. Carefully slide the card rack forward 3 or 4 inches to gain

,•
access to P.C.B. cable connectors.
4. Remove ALL cable connectors from both sides of the printed
circuit boards.

5. Remove card rack from machine and place on a suitable work

area.
6. Unplug and remove "Mother Board" from front of card rack. JI

32
5. MAINTENANCE AND REPAIR
Printed Circuit Board Replacement (cont'd)
7. Slide the I/O board out from the bottom of the ca r ;j r ack and
set aside (see Fig. 48).

,/C>..
.---.. . . . ?:. CD
SLI DE THE
REMA I N I NG
3 BO AR DS " ,
SO UND 1 /0.
CP U and VIDE O
GENER A TO R
OUT A S A
CO MPL ETE
ASS EMBLY

SLI D E B OTTO M BOARD",

UNPLU G 6 REMO V E ( A S- 31 77 1/0 B OA R D J
M OTHER B OARD ( A S-3 17 6 I FRO M RA C K
FR OM FR ONT OF RAC K

Fig. 48

8. Slide the remaining boards out from the card rack as a unit.
Note the position of the 3 P.C.B.'s in relation to each other
(sound I/O board on top, ' CPU board in the middle, and video
generator on the bottom) for future reassembly.
9. Place the boards on a suitable work area with the sound I/O
board facing up and the 72 pin edge connector towards you.

10. Unlock the nylon spacers and lift the sound I/O board away
from the CPU board.
11. Turn over all the boards, unlock the remaining spacers, and
unfold the video generator boa.rd from the CPU board. All
com p 0 n e n t son all boa r d s are now a c c e s sib 1 e . Boa r d s' can b e
separated completely after disconnecting the flat, ribbon-type
cables.
12. Reassemble the boards in the reverse order. With the
component sides of the boards facing each other, attach the video
generator board to the CPU board first, using the nylon spacers,
the n fa s ten the sou n d I /0 boa r d tot her eve r s e sid e 0 f the CPU
board. Verify that the 72 pin edge connectors of these 3 boards
are on the same side and properly aligned.

33
5. MAINTENANCE AND REPAIR
Printed Circuit Board Replacement (cont'd)
13. With the P.C.B. edge connectors facing you, verify that the
sound I/O board (top) has its two 24 pin cable connectors on the
right, properly connected by 24 pin ribbon-type cables to the CPU
board (middle). The CPU board must have its three 24 pin
connectors on the left, properly connected to the video . generator
board by 24 pin ribbon-type cables.
14. Carefully align the 3 board unit with the rack support rails
and slide into place within the card rack. Slide the I/O board
into position at the bottom of the card rack. Plug the "Mother
Board" into the front of the rack.
15. Slide the card rack back into place beneath the video
monitor. Reconnect all cables, plug game line cord into wall
socket and turn-on main-power switch. Run through Diagnostic Mode
sequence to verify proper machine operation.Machine is now ready
for normal operation.
CRT (Cathode Ray Tube) Video Monitor Replacement
-WARN ING­
HAZARDOUS HIGH VOLTAGES CAN EXIST IN
ANY TELEVISION UNIT, EVEN WITH POWER
DISCONNECTED!
EXTREME CAUTION IS REQUIRED WHEN
HANDLING A TELEVISION CHASSIS. DO
NOT TOUCH ELECTRICAL PARTS OR THE
TUBE YOKE AREA WITH YOUR HANDS OR
ANY METAL OBJECTS! MACHINE USER IS
TO PROVIDE PROPER PRECAUTIONS
AGAINST ELECTRIC SHOCK TO PERSONNEL
SERVICING OR MAINTAINING THIS
EQUIPMENT. THIS I NCLlIDES, BUT IS NOT
LIMITED TO, GLOVES AND OTHER
PROTECTIVE CLOTHING REQUIRED TO SUIT
THI S OPERATION.
1. Open front door of machine and turn off main power switch.
Disconnect game line cord from wall socket.
2 . Remove P.C.B. card rack. See "Printed Circuit Board
Re pIa c eme n t ", Pg. 3 2, for de t ail e d r emo val ins t r u c t ion s .
3. Disconnect the 9 pin "MOLEX" type connector on the left side
of the video monitor.
4. Remove the video stop bracket at the upper right corner of the
video chassis.

34
5. MAINTENANCE AND REPAIR
01
Q2

CRT (Cathode Ray Tube) Video Monitor Replacement

5. CAREFULLY slide the video monitor forward out of the game and
place it on a non-conductive surface.
-WARNING­
IF DROPPED OR OTHERWISE DAMAGED, THE
PICTURE TUBE WILL EXPLODE, CREATING
A SERIOUS PERSONNEL HAZARD! ALWAYS
HANDLE THE PICTURE TUBE CAREFULLY
AND WEAR SAFETY GOGGLES AND OTHER
PROTECT I VE CLOTH I NG WHEN WORK I NG
WITH VIDEO PICTURE TUBES. .
6. Reinstall the monitor using the reverse of the above
procedure. Run through the Diagnostic Mode before placing the
machine into operationto verify proper installation of video
monitor. See Section 7, pg. 38, "T.V. MONITOR MANUAL" for
detailed information on servicing video monitor.
Recorrmended Spare Parts List
To minimize machine downtime in the event of component failure or
malfunc'tion, it is recommended that the items listed below be
kept in stock in the quantities specified.
Always use only genuine BALLY manufactured or specified
replacement parts to keep all equipment warranties in force and
prevent the generation of radio interference or excessive X-ray
emission for which BALLY cannot be responsib~e.
Feature-Glass Lamps - Part # E-125-2, quantity 10
Display-Glass Lamps - Part # E-412-5, quantity 2
Front-Door Wedge-Base Lamps - Part # E-125-69, quantity 6
I/O Board - Part # AS-3177-1, quantity 1
Video-Generator Board - Part # AS-3175, quantity 1
CPU Board - Part # AS-3174-1, quantity 1
Sound I/O Board - Part # AS-3173-1, quantity 1
Fuses ( 4) : 3 amp - Part # E-133-3, quantity 3
5 amp - Part # E-133-5, quantity 6
8 amp - 'Par t # E-133-8, quantity 3
Video Power-Supply Board - Part # AS-3088-1, quantity 1
Reel-Window Glass - Part # G-388 (specify coin denomination &.
model number), quantity 1

35
5. MAINTENANCE AND REPAIR
Recommended Spare Parts List (cont'd)
Flourescent Starter - Part # E-411-7, quantity 1
Coin- Acceptor Assembly - Part # AS-277-167 (specify coin
denomination), quantity 1

•..
•

36
6. SCHEMATICS AND DIAGRAMS

List of Required Drawings

The schematics and diagrams listed below are to be u~€d for

service and maintenance procedures descr ibed in thi s manual.
Full-size copies of these drawings can be obtained from your
BALLY distributor or BALLY Manufacturing in Bensenville.

-WARN ING­

THE DRAWINGS LISTED BELOW ARE

PROPRIETARY INFORMATION OF BALLY
MANUF ACTUR I NG CORP. THE YARE
FURN I SHED FOR THE CONVEN I ENCE OF
BALLY CUSTOMERS IN SERVICING BALLY
EQUIPMENT ONLY! THE INFORMATION IS
DISCLOSED IN CONFIDENCE AND MUST NOT
BE COPIED OR OTHERWISE REVEALED TO
OTHERS, IN PART OR IN WHOLE, WITHOUT
THE EXPRESS WRITTEN CONSENT OF BALLY
MFG. CORP.
ANY PRINTS FURNISHED REMAIN THE
PROPERTY OF BALLY MFG. AND MUST NOT
BE USED IN ANY MANNER DETRIMENTAL TO
BALLY. PRINTS MUST BE RETURNED UPON
DEMAND.

Drawing Number

Mother Board ................................•.......... W-1268-3

CPU Board . . . . . . . . . . . . . . . . . • . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . W-1274
I/O Board .................................... W-1270 or W-1270-1
Video Generator Board ..•................................. W-1275
Sound Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • . . . . . . . . . . . . . W-1273
Dual Amplifier Power Board ............................... W-1276
Power Supply Board ....................................... W-1269
Power Terminal Board ................................... W-1267-1
Hopper Control Board .................................. W-1217-37
Overall Connection Schematic ........................ W-I046-2878
Slot Data System (SDS) Interface Wiring ................ W-1286-2

Drawings for use with optional Link Progressive Jackpot System:

Slave Unit Printed Circuit Board Wiring Diagram ....... W-1217-42

Slot Machine Display Resistor Package Wiring Diagram. W-1217-40c
Slot Mounted LED Jackpot Display Wiring Diagram ...... W-1217-40c
Un i ve r sal Lin k Pro g res s i ve Wi r in g for V-I 297 ........... W- 1 2 86- 3

For Link Progressive System retrofit of machines already in the

fie 1 d , o r d e r par t # K - 0062 1 - 1, IIV ide 0 S lot Lin k Pro g res s i ve S 1 a v e
Kit", which includes all required parts, drawings, and
instructions to convert any standard V-1297 to Link Progressive
operation.

37
r
7. T.V. MONITOR MANUAL
Introduction
This section is intended to familiarize you with the T.V. monitor
used in this machine and it can assist you in making repairs
should the monitor malfunction. A basic knowledge of electronics
is helpful and most of the tests described require the use of a
voltmeter.
Before attempting to repair the monitor, read this entire section
and obey all warnings and cautions. Then proceed to locate the
problem using the following steps:

1. Match your moni tor problem against those 1 isted under I1Symptom
Diagnosisl1. The chart will then describe which circuits to check
and which components are most likely causing the problem.
2. Once you identify the circuit causing the problem, read the
I1Troubleshooting l1 section to find out what procedures to use for
locating the faulty component(s).
3. Refer to the schematic diagrams to identify the faulty
components in the failed circuit.
The above procedure will not solve every video-monitor
difficulty. It will help you repair the majority of monitor
problems, and for those cases too ' complex for this manual,
assistance is available direct from BALLY by dialing the toll­
free 800 number listed on the back of the front cover. Further
assistance can also be obtained from your local BALLY distributor
and field service personnel.
I
Symptom Diagnosis
Insufficient picture width or height:
II
A. Horizontal line (due to VERTICAL CIRCUIT defect). I
Bad yoke.
Bad vertical output section.
Open fusible resistor in vertical section.
Bad height control.
Bad flyback (high voltage) transformer.
B. Vertical line (due to HORIZONTAL CIRCUIT defect).
Bad yoke.
Open width coil.
Open part in horizontal section.
,
Picture too spread out or crushed in certain areas:
,
,
Bad horizontal or vertical output transistor.
Defective component in output circuitry.

38 ,
7. T.V. MONITOR MANUAL 0 1.
Q2 .

Symptom Diagnosis (cont'd)

Poor focus and convergence:
Bad flyback transformer or control.
Focus voltage wire not connected to neckboard terminal.
Colors missing:
Check interface color transistors.
Check color output transistors.
Check for a cracked printed circuit board.
Check color circuits.
Check video i npu t jacks.
Insufficient picture brightness:

Weak emission from picture tube. (Turn horizontal sync off

frequency and turn brightness all the way up for about 15
minutes. This occasionally cures this problem.)
Check video signal at the picture tube cathode pin with an
oscilloscope. If the signal is approximately 80 volts peak
to peak, the tube has weak emission and must be replaced.
Silvery effect in white areas:
Check beam current transistors.
Weak picture tube emission.

Excessive brightness with retrace lines:

Check Beam limiter transistors
Brightness and/or color blanking control set too high.
Increasing brightness causes an increase in size and poor focus:
Weak high voltage rectifier or high voltage regulation.
Small picture and/or poor focus:
Low B+ voltage (power supply problem).
Vertical rolling:

Bad vertical oscillator transistor, I.C., or circuit.

No sync from logic board.
Horizontal line across center:

Dead vertical output circuit (see "Insufficient picture width

or height".)
Vertical oscillator wave form incorrect.

39
7. T. Vm MONITOR MANUAL
Symptom Diagnosis (cont'd)
Picture bends:
Adjust horizontal sync.
Magnetic or electromagnetic interference.
•
Flashing picture, visible retrace lines:
Broken neck board.
Internal short circuit in the picture tube (arcing).
Unsymmetrical picture or sides of picture:

Defective yoke.

•I
No brightness, power supply operating - no high voltage for
picture tube:

Check horizontal oscillator.

Check horizontal amplifier and output.
Check flyback transformer.

No brightness, high voltage present:

Check heater voltage to the tube at the neck board.
Check screen grid voltage for picture tube.
Check focus voltage.
Check grid to cathode picture tube bias.

•
No high voltage:

Check AC input to the flyback transformer.

•
Check horizontal deflection stages.
Check flyback transformer.
Check yoke.
Check power supply.
No horizontal and vertical hold:

Check sync transistors and associated circuitry.

Check wires and jack from logic board to the monitor.
Wavy picture (power supply defect):

Check transistors, diodes, and electrolytic capacitors in

power supply.

Unshielded or ungrounded electric motor operating nearby.

Moving bars in picture:

Ground between monitor and logic boards disconnected.

40
7. T.V. MONITOR MANUAL
Symptom Diagnosis (cont'd)
Moving bars in picture
Power supply defect (see "Wavy picture").
Monitor does not energize:
Power supply problem. Check fuse, transistors, open fusible
resistor.
Shorted horizontal output transistor.
Defective high voltage disabling circuit.
Crack(s) in main chassis board.
No purity or convergenci adjustment:
Use a degausser to demagnetize picture tube in accordance
with degausser manufacturer's instructions.
Defective picture tube.
Metallic foreign material present in picture tube shield.
Electromagnetic interference from nearby equipment.
Poor focus or width of picture.
Guide to Schematic Symbols

II
II
II
II
THERMISTOR IRON CORE TRANSFORMER
(POLARITY DOESN'T MATTER) (SUCH AS A FL YBACK)

INDUCTOR, COIL, CHOKE FUSE

(POLARITY DOESN'T MATTER) (POLARITY DOESN'T MATTER)

(-) CATHODE CATHODE (-)

t (+) ANODE

ZENER DIODE
ANODE (+)
t
DIODE

41
7. T. V. MONITOR MANUAL
Guide to Schematic Symbols (cont'd)

BASE--""'·

NPN TRANSISTOR PNP TRANSISTOR

•
•
VARIABLE RESISTOR, POT, CONTROL
(POLARITY DOESN'T MATTER)
RESISTOR
(POLARITY DOESN'T MATTER)
•
•
+ •
•
LINES ARE CONNECTED ELECTROL YTIC CAPACITOR

~ •
+
LINES ARE NOT CONNECTED
T
CAPACITOR
•
(POLARITY DOESN'T MATTER)

OR

GROUND
II
42
II
7. T.V. MONITOR MANUAL
-
01
a:
Troubleshooting
T r 0 ubI e s h 0 0 tin g CRT m0 nit 0 r s r e qui res car e f u 1 a t ten t ion t 0
detail. The first step is to match the symptom displayed by the
monitor against those listed in the "Symptom Diagnosis" section.
This will assist you in locating the circuit where the problem is
most likely occurring, and often gives specific parts to check.
Next, the monitor should be removed from the machine, following
the ins t r u c t ion sin Sec t ion 5, P g . 3 4, "CRT (Cat hod eRa y Tub e )
Video Monitor Replacement". Be certain to obey all
warnings and cautions concerning handling of the monitor.
-WARNING­
IF DROPPED OR OTHERWISE DAMAGED, THE
PICTURE TUBE WILL EXPLODE, CREATING
A SERIOUS PERSONNEL HAZARD! ALWAYS
HANDLE THE PICTURE TUBE CAREFULLY,
NEVER CARRY THE TUBE BY THE NECK,
AND ALWAYS WEAR SAFETY GOGGLES AND
OTHER PROTECTIVE CLOTHING WHEN
WORKING WITH VIDEO PICTURE TUBES.
After removing the monitor from the machine and placing it on a
suitable NON-CONDUCTIVE table or workbench, all circuits must be
visually inspected for broken, burned, or parts. The usual order
of parts failure (with those most likely to fail listed first) is
as follows:
1. Semiconductors (transistors, diodes, I.C.'s).
2. Fusible resistors.
3. Electrolytic capacitors.
4. Resistors.
5. Capacitors and coils.
-WARNING­
HAZARDOUS HIGH VOLTAGES CAN EXIST IN
ANY TELEVISION UNIT, EVEN WITH POWER
DI SCONNECTED! EXTREME CAUTION IS
REQUIRED WHEN HANDLING A TELEVISION
CHAS SIS. DO NOT TOUCH ELECTR I CAL
PARTS OR THE TUBE YOKE AREA WITH
YOUR HANDS OR ANY METAL OB JECTS !
GAME USER IS TO PROVIDE PROPER
PRECAUTIONS AGAINST ELECTRIC SHOCK
TO PERSONNEL SERVICING OR
MAINTAINING THIS EQUIPMENT. THIS
INCLUDES, BUT IT IS NOT LIMITED TO,
GLOVES AND OTHER PROTECTIVE CLOTHING
REQUIRED TO SUIT THIS OPERATION.
To discharge the residual voltage contained in the picture tube,
connect one end of a wire to chassis ground and theother end to
a PLASTI C HANDLED SCREWDRI VER. Gr as ping ONLY the p I as tic hand I e

43
7. T.. V. MONITOR MANUAL
Troubleshooting (cont'd)
with one hand and touching nothing else except the floor with any
other part of your body, CAREFULLY insert the screwdriver blade
into the anode hole of the picture tube. Be prepared for a flash
and a loud pop. The longer the monitor has been without power,
the dimmer the flash and smaller the pop will be.
-WARN ING­
USE ONLY THE ABOVE PROCEDURE TO
REMOVE THE RESIDUAL CHARGE FROM THE
PICTURE TUBE. ALWAYS REMOVE THE
CHARGE REGARDLESS OF HOW LONG THE
PICTURE TUBE HAS BEEN WITHOUT POWER.
To maintain the safety and performance of the monitor, always use
exact replacement parts. Service the monitor on a firm, NON­
CONDUCTIVE table, and remove all jewelry and other metallic items
from your person before beginning troubleshooting procedures.
-CAUTION­
THE T.V. MONITOR DOES NOT CONTAIN AN
ISOLATION TRANSFORMER ON ITS
CHASSIS. WHEN SERVICING THE MONITOR
ON A TEST BENCH · OR TABLE, THE
MONITOR MUST BE I SOLATED FROM ANY AC
VOLTAGE WITH AN ISOLATION
TRANSFORMER.
Carefully observe a test picture and change the setting of the
various controls that most likely affect the symptom displayed.
For example, if the problem is poor brightness or no picture, try
increasing the brightness or contrast control settings. If the
controls have no effect at all, the trouble is most likely in the
controls, associatedcircuitry,or nearby circuits which may be
upsetting the voltages.
-WARN ING­
CAPACITORS, AS WELL AS THE PICTURE
TUBE, CAN HOLD A HAZARDOUS
ELECTRICAL CHARGE AT LEAST A WEEK OR
LONGER AND MUST BE DISCHARGED USING
A PLASTIC HANDLED SCREWDRIVER AND
THE METHOD USED FOR THE PICTURE TUBE.
First, check for obvious visual defects such as broken or frayed
wires, over-soldering, missing and/or burned components, or
cracked P.C.B.'s. If everything checks out, make certain that all
diodes, electrolytic capacitors, and transistors have their leads
connected in the correct polarity as shown on the schematic and
the circuit board.

44
 7. T.V. MONITOR MANUAL
10 1,
IQ2 .
r Troubleshooting (cont'd)

I
~
Turn on the power and measure the voltages at the lea d s o f active
de vic e s s u c has tub e s, t ran sis tor s, 0 r i n t e g rat e d c i r c u i t s. An y
voltage that in not within 10% to 15% of that specif i ed on the
schematic indicates either a problem with the device being
checked or a component connected to it in the circuit. An
o h mm e t e r mus t now be use d ton a r row the fie 1 d 0 f po s sib 1 y
defective components.

To test a transistor, one lead of the ohmmeter is placed on the

base, and the other lead is placed on the emitter. A normal
transistor will read high to infinite resistance or little
resistance (typically 400 to 900 ohms) depending on the polarity.
The ohmmeter lead on the emitter must now be placed on the
collector and an opposite resistance reading should be obtained.
If resistance read high or infinite when the ohmmeter lead was on
the emitter, it should read low when placed on the collector. If
resistance was low when the ohmmeter lead was on the emitter, it
should read high or infinite when placed on the collector.
Consistently infinite readings indicate an open in the transistor
while a short is indicated by readings of 0-30 ohms. Now place
one ohmmeter lead on the collector, the other on the emitter. No
matter which leads are placed where, there should be infinite
resistance. A lower reading, for example 50 ohms, indicates a
short.

The lowest ohmmeter settings are usually required for testing ,

t ran sis tor s. On r are 0 c cas ion s, a t ran sis tor ma y pas s the s e .-
tests, but become "leaky" or break down only at higher voltages.
If there is any doubt, replace the transistor. The transistor can
also be tested out of the circuit in case some other component in
the circuit is affecting the ohmmeter reading.

A diode is tested in the same manner as a transistor, with the

exception that there are only two leads. Again, there should be
high or infinite resistance one way, and little or no resistance
the other. If the test indicates the diode is defective, remove
one lead from the circuit and retest it in case another component
in the circuit is affecting the ohmmeter reading.

-CAUTION­
DO NOT LEAVE SOLDERING EQUIPMENT ON
THE COMPONENT LEADS ANY LONGER THAN
NECESSARY TO PREVENT DAMAGE TO HEAT
SENSITIVE SEMICONDUCTOR COMPONENTS.

Integrated circuits can be checked without the use of special

e qui pm e n t b Y v e r i f yin g .the cor r e c t DC vol tag eon the pin san d the
correct AC wave form using an oscilloscope.

45
7. T.V. MO NITOR MANUAL
Troubleshooting (cont'd)

-CAUTION­
SHORTING ACROSS THE PINS OF AN I.C.
MAY DESTROY IT!

Resistors are checked using an ohmmeter and must be within 10% of

the value stated on the resistor body and the schematic. It ma y
be necessary to de-solder one lead from the circuit boa r d f or
testing purposes. If the board's conductive foil is damaged i n
the process, carefully solder a small wire over the break to
reconnect the foil.

Capacitors cannot be tested using an ohmmeter as both the i r

voltage and resistance increase as they charge themselves u s i n g
current from the meter. If all other components in a cir cu it
check out, electrolytic capacitors are most likely causing the
problem. Substitute a new capacitor and test monitor operation.

Theory of Operation

This section will assist you in understanding how the T.V.

monitor functions. It examines large, general groups of circuits
to avoid confusion and aids in achieving a basic knowledge of
monitor operation.

Power Supply"

The AC current to the monitor from the game transformer has 60

cycles per second, identical to the current from a wall outlet. A
monitor requires a stable DC current for proper operation. Diodes
are used to rectify the incoming AC into DC and a large
e 1 e c t r 0 I Y tic cap a cit 0 r i sus e d t 0 fur the r s tab iii z e the DC
supply. Because of its size and power requirements, the monitor
also contains zener diodes and transistors to maintain sta ble DC
current.When the monitor picture becomes wavy, it is a sign t h at
AC i s fin din g its way t h r 0 ugh a m a I fun c t ion i n gpo we r sup ply. I f
the voltage from the voltage from the power supply is too low,
other , circuits won't receive the necessary power and only a
small, wavy picture or none at all will be visible.

Chassis Interface Section

The interface section of the chassis is identified by the video

j a c.k s w h i c h r e c e i vet he i n put fro m the log i c boa r d s. The rea r e
sets of transistors that receive the separate red, green, bl ue ,
and sync information from the logic boards. These cir cuit s
increase the voltage and match impedences, preparing the log ic
board outputs for the circuits that will amplify them for use in
the yoke or picture tube.

Note that the sync is negative-going. This means that both

horizontal and vertical sync are negative going wave fo rmsand

46
/
7. T.V. MONITOR MANUAL
Theory of Operation (cont'd)
.
I(
I(

that these two pulses are going at different speeds. The vertical
wave forms are at 60 Hz (Hertz or cycles per second) and the
horizontal wave forms are at 15,625 Hz.
The sync signal is amplified by a sync amplifier transistor and
the color information is sent to the neck board where main
amplification occurs.
Vertical an Horizontal Deflection
After the sync signal is amplified by the sync amplifier, it goes
to both the vertical and horizontal circuits. The sync signals
provide the timing for picture assembly, preventing break-up and
other distortions as each of the electron beams scan the tube
face to create one portion of the picture.
The 60 Hz pulse sent to the vertical oscillator makes sure that
this circuit oscillates at 60 cycles per second. Without this
pulse, the circuit will oscillate at a higher or lower frequency,
causing the picture to "roll" up or down.
The Wells-Gardner 13" color monitor uses transistors for its sync .-
section whil ·e an Electrohome 13" uses a single integrated
circuit, IC 501. Both components perform the same function, .-
sending a 60 Hz sawtooth waveform to the yoke's vertical coils.
On the way to the output transistors, the 60 Hz pulse is shaped I
I
and amplified by the yoke so that the amplified vertical output I

fills the screen. If only a horizontal line is visible on the

monitor screen, there is a problem with one of the components in ~I
I
the vertical section. I
I

The horizontal section is similar to vertical section with the

exception that it uses a different wave form. The horizontal wave
form is close to square and has a frequency of 15,625 Hz. Again,
Wells-Gardner uses transistors for the horizontal oscillator
while Electrohome uses the other side of IC 501. If the
oscillator doesn't provide the correct frequency, the picture may
move sideways, start to slant, or break-up with thin, slanted
figures.
In both the horizontal and vertical sections, there are variable
resistors that change the oscillation frequency to keep the
picture in sync and assembled properly.
The wave form is shaped and amplified in the horizontal section
just as in the vertical section. The horizontal section, however,
also feeds the high voltage flyback transformer.

47
7. T.V. MONITOR MANUAL
Theory of Operation (cont'd)
The Flyback Transformer
The picture tube requires a higher voltage than the power supply
can give to provide a picture. The flyback transformer fulfills
this need by increasing the 15,625 Hz. horizontal transistor
output to a higher voltage at the same frequency. In the flyback
are diodes that rectify the incoming AC into DC before the power
is sent through the thick red wire to the picture tube.
-WARNING­
THIS RED WIRE CARRIES AN 18,000 VOLT
POTENT I AL! DO NOT TOUCH IT WITH ANY
PART OF YOUR BODY OR ANY OTHER
OBJECT!
The flyback has extra output windings to support the picture tube
heater, the vertical deflection circuits, and picture tube screen
grid voltage. In this way, the flyback transformer resembles a
second power supply.
Co lor C i r cui t s
The color signals pass through the interface section where some
amplification and impedence matching occurs. These circuits
contain relatively few components and from here the AC color
signal is sent to the neck board.
The color-output circuits are located on the neck board. The
color signals going to the transistors are regulated by two
variable resistors called drive controls. There are two of these,
one for the red and one for the green (there is no drive control
for blue). In the emitter part of each transistor is another
variable resistor called the cut-off control. These controls vary
the amount of the amplified AC signal that goes to the cathodes
ofthepicture tube.The higher thesignal, thedeeperthe color.
The bases of these transistors are connected to each other and to
the beam-limiting transistors in the interface section.
The beam limiter helps control the brightness and the blanking
transistor rapidly turns the picture tube "ON" and "OFF" so the
retrace line don't appear on the screen. By increasing the
brightness on a good monitor, the 4 to 6 retrace lines can be
seen slanting diagonally across the picture.
Protection Circuit
To keep the high voltage section from generating X-rays due to
over-voltage from the power supply, a sensing circuit turns off
the horizontal oscillator using a transistor. If this circuit is
activated, the monitor will have no picture and appear to be off.
The excessive amount of voltage from the power supply which

48
7. T.V. MONITOR MANUAL

Theory of Operation (cont'd)

triggered the circuit in the first place is still present,
however. To verify proper power supply voltage, check the emitter
on TR502 on Wells-Gardner units or the emitter of X04 on
Electrohome monitors. The correct voltages are: I
Wells-Gardener - 127 VDC [I
E I e c t r 0 home - 1 2 0 VDC .
This voltage is measured at pin B1 on Electrohome monitor chassis
as this monitor uses an integrated circuit and little else in the
power supply.
The Picture Tube (or CRT)
The picture tube or CRT (Cathode Ray Tube) is an output device,
its display being the end result of the circuits described
earlier.
The picture tube contains a heater which "boils" electrons off
the cathodes to form the beam which excites the three (red,
green, and blue) screen phosphors, causing them to emit light and ~
.,'
create the picture used for playing the game. The cathodes can '"0'''''

arc or short to the heater resulting in no picture and a

defective tube.
The picture tube contains three grids, the first of which is
grounded. The second grid has a potential of approximately 300
VDC applied to it, depending on the brightness setting. The third
grid is used to focus the electron beams and receives about 1/5
the voltage applied to the picture tube anode.
After leaving the cathode and passing through all the grids, the
electron beam goes through a mask, a sheet of material containing
very small holes. The electron beam now reaches th~ phosphor dots
on the inside surface of the tube face, causing them to glow. The
green electron "gun" (or cathode and associated circuitry) beams
electrons only at the green phosphor dots. The red and blue
"guns" beam their electrons only at the red and blue phosphor
dots. The blending of the three primary colors in the monitor
screen determines the color seen. Too intense an electron beam
can "burn" the phosphor dots, leaving a permanently visible dark
image after the monitor is turned off.

49
7. T.V. MONITOR MANUAL

Differences Between Monitors

Two different brands of 13 11 color video monitors are used in

BALLY gaming equipment, the IIWells-Gardner ll and the
IIE1ectrohome ll • Each uses separate P.C.B.ls for main sections of
circuitry. A few parts, however, are still mounted on the
chassis. The IIElectrohome" monitor can be identified by its lack
of separate P.C.B.ls, except for the neck board and its flat
chassis. Monitors can also be identified by the callout numbers
on components. "Wells-Gardner" part numbers begin with the
letters IITR" , "Electrohome" part numbers begin with an "X".

NOTE: The following diagrams depict the BALLY installed wiring

used to place the monitor vertical and horizontal centering
controls at a remote location within the machine cabinet. Because
of this installation, the controls for these functions located on
the monitor are no longer usable. When the monitor is removed to
a test bench, separate vertical and horizontal controls must be
temporarily connected to these pin locations while the test
procedures are performed.

ELECTROHOME EXTERNAL MONITOR CONTROLS

LEAD SOLDERED TO RESISTOR

VERT.CENT.ADJUS~
R421
100K OHMS
30.3 - YELLOW
13;3 - RED/YELLOW

V. CENT.Ci
83.3 - BLACK/YELLOW
43.3 - GREEN/YELLOW
HORZ.CENT.ADJUST.
H. CENT . CJr=~__4!23~.~3~-=2B~L~U~E~/!Y~E~LL~O~W~~------~~
250 OHMS

CHASSIS REMOVED R501 &R507

WELLS-GARDNER EXTERNAL MONITOR CONTROLS

Drr-r~3~0~.3~-_Y~E~L~L~O~W~____~
VERT. SHIFT
VERT. CENT. ADJUST.
CO--+~""':"""--~~~=-~
83.3 - BLACK/YELLOW 100K OHMS
~~~--------------~------------~~~
13.3 RED/YELLOW

HORZ. CENT. ADJUST.

43.3 - GREEN/YELLOW
250 OHMS
23.3 - BLUE/YELLOW

CHASSIS
Fig. 49

50
 13" COLOR MONITOR S
MODELS 13K4801, 13K41,
Power Supply Voltage and Symb.o ls
-
.)

Symbol Voltage Operating Circuit

*
• 15V

130V
VerI. Osc.
Sync
Blanking
CRT Cut·Oft

Horiz. Osc .
X-RAY RADIATION PRECAUTION :

THIS PRODUCT CONTAINS CfiiTIC,L\L

ELECTRICAL AND MECHANICAL PARTS
8 Horz. Drive ESSENTIAL FOR
PROTECTION .
X - RAY RADIATION
Horz. Output
VerI. Output FOR REPLACEMENT PURPOSES , USE
ONLY TYPE PARTS SHOWN IN THE
0 175V Video Output
PARTS LIST .

- ~ ORrl

A TP·81 Q351 COLLECTOR ·""or

lv/DIV 200uSECIDIV 0.5/D IV 5MSECIDIV 20V/DIV 10uSEC/DIV R 204

ICOtl /2} 2
TP· ~1
DC COUPLED
BOnOM LINE = 0 VDC Tp·82 o
R2 0e
2?O{ 1I2)

2V/DIV 200MSEC/DIV 20VIDIV 5MSEC/DIV 2V/DIV 10uSEC/DIV A

TP·31, AC COUPLED B J402·3

R ~Ol
2 70

1V/DIV 200u SEC/DIV 0.5/DIV 20u SEC/DIV 5V/DIV 20uSEC/DIV

NEGATIVE SIDE OF C303 I.C. 301 , PIN 13 F

IC 3 0 1 .n
a 2.
I I I / / /
, /
,
SYNC AMP vOSC H OSC c=
HA I 1423 0022' 1
( M ")

,I !/
I \ I
.L~ ,... ~ Ol

4A -1~ ~V

2V/DIV 5MSEC/DIV lVDIV 200u SEC/DIV lVDIV 2MSECIDIV

I.C. 301 , PIN 3 I.C. 301 , PIN 15 F

1V/DIV 5MSECIDIV lVlDlV 10uSECIDIV lV/DIV 20u SECIDIV

 HEMATIC DIAGRAM
06, 13K4851, 13K4856
6
OSCILLOSCOPE WAVEFORM PATTERN
CAUTION: FOR CONTINUED SAFETY,
The waveforms shown are as observed on the wide band
REPLACE SAFETY CRITICAL COM· oscilloscope with the monitor turned to a reasonably
PONENTS ONLY WITH MANUFAC· strong signal and a normal picture. The voltages shown
TURER'S RECOMMENDED PARTS. on each waveform are the approximate peak ampli·
AVERTISSEMENT: POUR MAINTENIR tudes.
LE DEGRE DE SECURITE DE L'APPAREIL If the waveforms are observed on the oscilloscope with
NE REMPLACER LES COMPOSANTS a poor high frequency response, the corner of the
DONT LE FONCTIONNEMENT EST
pulses will tend to be more rounded than those shown
CRITIQUE POUR LA SECURITE QUE PAR
DES PIECES RECOMMANDEES PAR LE and the amplitude of any high frequency pulse will
FABRICANT. tend to be less.

0401 0402

-
REO OUT GREEN OUT
25C24821lK 25C2482JjK
2 5C2610BK 25 C2610BK

6*
370K5B221y)

C 3611
L~~~~·~'~·O~____-!~=================:==:===~----------~~S;~~~~L.------------~~
.. .-1 ~------, 'M
R 3~8 I
0.033 !J6K Q 352
(MY) (kC1/21 HOR.OUT

250869
250898B L~

• I~V

C 3n7
0033
(M'I'I!JI J;
0701
ERB~U:~
I)'"
•,,, .. C701
1000

.""'
soo
1"0R: CE NTE RINGI
H.Y- UNIT
1351
120v

I
U t
R314
220 ~J 601[Q]
t
l$ tj
--- --- * OEFL YOKE K4801E, K4851E. - 5832
1 K4806D. K48568
 REPLACEMENT PARTS LIST
,
This monitor contains circuits and components included specifically
for safety purposes.
­
For continued protection no changes should be made to the original
design, and components shown in shaded areas of schematic, or J!.*
on parts list should be replaced with exact factory replacement parts.
The use of substitute parts may create a shock, fire, radiation or other
hazard. Service should be performed by qualified personnel only.

MAIN BOARD

Ref. No. Part No. Description Ref. No. Part No. Description

RESISTORS RESISTORS (CONT.)

R2'o1 2.03X65.O.O-645 1K Ohm , 5 %, 1I4W Carbon R369 2.03X56'o2-329 68'oK Ohm , 5 % , 1I2W Compo
R2'o2 2.03 X65.O.O-523 33.0 Ohm , 5 %, 1/4W Ca rbo n R37.O 2.03X6 5.O 1-.0.02 33K Ohm , 5 % , 1I4W Carbon
R2.03 2.03 X65'o'o-4.05 1.0.0 Ohm , 5 % , 1/4W Carbo n R371 2.03X9.014-584 1K Ohm , 5 % , 1W Metal O x ide
R2'o4 2.03X67.O.O-327 100 Ohm , 5 %, 1/2W Carb o n R372 2.03X65.O.O-988 27K Ohm, 5 % , 1/4W Carbon
R2.05 2.03X67'o'o-421 27.0 Ohm, 5 % , 1/2W Carbon R375 2.03X67.O.O-8'o1 1'oK Ohm , 5 %, .1 /2W Carbon
R2.06 34'oX2241-934 24.0 Ohm , 5 %, 1I4W Carbon R376 2.03X91 .04-386 22.0 Ohm, 5 %, 2W Metal O x ide
R2'o7 2.03 X65O'o-447 150 Ohm , 5 % , 1I4W Carbon R377 2.03X65O'o-447 150 Ohm , 5 % , 1I4W Carbon
R2.08 34'o X2241 -934 24.0 Ohm , 5 % , 1/4W Carbon R378 2.03X65.O.O-886 1'oK Ohm , 5 % , 1I4W C arbon
R2.09 2.03 X65'o'o-447 150 Ohm , 5 % , 1/4W Carbon R379 2.03X65.O.O-886 1'oK Ohm , 5 %, 1/4W Carbo n
R21.O 34'oX2241 -934 24.0 O h m , 5 %, 1/4W Carb o n R38.O 2.03X65.O.O-886 1'oK Ohm , 5 %, 1/4W Carbon
R211 2.03X65'o'o-447 15.0 Ohm , 5 % , 1/4W Carbon R381 2.03X65'o'o-724 2.2K Ohm, 5 %, 1/4W Carbon
R214 2.03X65O.O-645 1K Ohm , 5 %, 1I4W Carbon R382 2.03X600.O-879 56.0 Ohm, 5 % , 1/4W Carbon
R215 2.03X65'o1-126 lO'oK Ohm , 5 %, 1I4W Carbon R5'o2 2.03X65O.O-886 1'oK Ohm , 5 %, 1I4W Carbon
R216 2.03 X65.O.O-645 1K Ohm , 5 %, 1/4W Carbon R5.03 2.04 X 17.0.0-553 22.0 Ohm , 5 % , 15W WW
R217 2.03X65.O.O-4.05 1.0.0 Ohm , 5 %, 1/4W Carbon R5'o4 2.03X9'o14-267 47 Ohm , 5 % , 1W Metal Oxide
R2 18 2.03X65.O.O-645 1K Ohm , 5 %, 1/4W Carbon R505 2.03X65'o1 -2.09 22'oK Ohm , 5 %, 1I4W Carbon
R219 2.03X65.O 1-126 lO.OK Ohm , 5 %, 1/4W Carbon R507 2.03X56'o2 -185 33'oK Ohm , 5 % , 1/2W Compo
R22'o 2.03X6500-645 1K Ohm , 5 %, 1I4W Carbon ~*R601 2.04X 1625-.058 3.3 Ohm , 5 % , 1.OW WW
R221 2.03X65O'o-4.05 1'o'oK Ohm , 5 %, 1I4W Carbon R7'o1 2.03X91'o4-'o21 6 .8 Ohm, 5 %, 2W Metal Ox ide
R222 2.03X65'o'o-762 3.3 Ohm , 5 %, 1/4W Carbon R7'o2 2.03X62.06-441 2.2 Ohm , 5 % , 1I2W Carbon -
R223 2.03X65'o'o-762 3.3 Ohm , 5 %, 1/4W Carbon VR2.01 2'o4X2'o7'o-'o72 2K Ohm · S Semi·Fi xed -
R224 2.03X6500·169 1.0 Ohm , 5 %, 1/4W Carbon VR3.01 2.04X2.07.O·.084 5K Ohm·S Semi·Fl xed
R225 2.03X65'o'o-169 1.0 Ohm, 5 % , 1I4W Carbon VR3.02 2.04 X2.07.O·.023 1'oK O hm · S Semi -Fi xed
R226 2.03X65.O.O·169 1.0 Ohm , 5 % , 1I4W Carbon VR3.03 2'o4 X2'o7.O-.055 5.0.0 Ohm· S Se mi -Fi x ed
R227 2.03X6001-561 47K Ohm , 5 %, 1I4W Carbon VR351 2.04X2.07.O·.072 2K Ohm · S Sem i-Fi x ed
R228 2.03X65.O.O·689 1.5K Ohm, 5 %, 1I4W Carbon VR352 2'o4 X2'o7'o-'o72 2K Ohm·S Semi· Fi xed
R229 2.03X67'o'o-421 27.0 Ohm , 5 % , 1/2W Carbon
R23.O 34.OX2822·934 8.2K Ohm, 5%, 1I4W Compo
R231 34'oX2822-934 8.2K Ohm , 5% , 1/4W Comp o CAPACITORS
R232 34'oX2822-934 8.2K Ohm , 5 %, 1/4W Comp o C2.01 2.03X.O.014·.088 10.0.0 uF , 16V, Elec trolytic
R233 2.03X6.O.O.O-699 18.0 Ohm , 5 %, 1I4W Carbon C2.02 2.03X.O.014·.076 47.0 uF , 16V, El ec trolytic
R234 34'oX282.O-934 82 Ohm , 5 % , 1I4W Carbon C2.03 2.03X.O.014·.076 47.0 uF, 16V, El ectro lytic
R235 34.OX282.O·934 82 Ohm , 5 %, 1I4W Carbon C2.04 2.03X'o'o14-'o76 47.0 uF, 16V, Electrolytic
R236 34.OX282.O·934 82 Ohm , 5 %, 1/4W Carbon C2.05 2.03X.O.014·.076 47.0 uF, 16V, Electrolytic
R3'o1 2.03X65.O.O-5.08 27.0 Ohm , 5 %, 1/4W Carbon C2.06 2.03X181.O·149 .0.1 uF, 125V Mylar
R3'o2 2.03X65.O.O·863 8.2K Ohm , 5 % , 1/4W Carbon C2.07 349X2232·1.09 ..022 uF, 1.O'oV Mylar
R3.03 2.03X6500·863 8 .2K Ohm, 5 % , 1/4W Carbon C3'o1 2.03X.O.014 ·.065 33.0 uF, 16V Electrolytic
R3'o4 2.03X65O'o-724 2.2K Ohm , 5 % , 1I4W Carbon C3'o2 2.03X 16.0.0·563 .0 ..022 uF , 5.OV Mylar
R3.05 2.03X65O.O-842 6 .8K Ohm , 5 %, 1I4W Carbon C3.03 2.03X.0629·.037 2.2 uF, 5.OV Elec trolytic
R3.06 2.03X65O.O·863 8 .2K Ohm , 5 %, j/4W Ca rbon C3'o4 2.03X 16.O.O·366 .0 ..0068 pF , 5.OV Mylar
R3'o7 2.03X6500-825 5.6K Ohm , 5 % , 1I4W Carbon C3.06 2.03X'o412 -'o12 2.2 uF , 16V Tantal
R3.09 2.03X65O.O-965 22K Ohm , 5 %, 1/4W Carb o n C3'o7 2.03X16.0.0-634 .0 ..033 ~F, 5.OV Mylar
R310 203X65.O.O-988 27K Ohm , 5 %, 1/4W Carbon C3.08 2.03X.O.025·174 3 .3 uF, 50V Elec trolytic
R311 203X9.014-762 5.6K Ohm , 5 %, 1W Metal Ox ide C3.09 2.03X12.07· 1.O.O .0 ,.068 uF, 1.O.OV PP
R312 203X9.014·741 4.7K Ohm , 5 % , 1W Metal Ox ide C310 2.03X.0629·.061 1.0 uF, 5.OV El ectro lytic
R313 2'o4X145O-537 1.2K Ohm, 5 % , 5W Meta l Ox ide C311 2.03X.0041·.025 1.0 uF, 160V Electro lytic
R314 2.03X65.O.O·481 22.0 Ohm , 5 %, 1/4W Carbo n C3 12 2.0 2X7.05.O·248 10.0.0 pF , 5.OOV CeramiC
R315 2.03X65.O.O·169 1.0 Ohm , 5 %, 1/4W Carbon C3 13 2.03X.O.04.O ·.052 47 u F , 16.O V Elect ro lytic
R316 2.03X65.O.O·741 2.7K Ohm , 5 %, 1/4W Carb on C314 2.03X 12.07 -.043 .0 ..022 uF, 1.O.OV PP
R3 17 2.03X67.O.O· 1.07 12 Ohm , 5 %, 1/2W Carbo n C 3 15 2.0 3X.0629 ·.023 1 uF, 5.OV Electrolytic
R3 18 2.03X65O.O·54.O 39.0 Ohm , 5 %, 1I4W Carbon C351 203X.0629·.023 1 uF, 5.OV Elec trolytic
R3 19 2.03X65O.O-645 1K Ohm, 5 %, 1/4W Carbon C352 2.03X.0619·.045 47 uF, 25V Electrolytic
R320 2.03 X6501 ·.002 33K Ohm , 5 %, 1/4W Carbon C353 2.03X1190·015 .0 ..0082 pF , 5.OV Mylar·PP
R32 1 2.03X65.01 ·224 27.OK Ohm , 5 %, 1/2W Ca rbon C354 2.03X.0619·.045 47 uF , 25V Electrolytic
R322 2.03X650.O·886 1'oK Ohm , 5 % , 1/4W Carbon C355 2.03X 16.0.0·366 .0 ..0068 pF , 5.OV Mylar
R351 2.03X65.O.O·886 1'oK Ohm , 5 % , 1/4W Carbon C356 2.02X7.05.O ·282 .0 ..015, 5.O.OV Ceramic
R352 2.03 X65'o'o-785 3.9K Ohm , 5 % , 1I4W Carbon C359 2.02X8065·6.06 1.0.0 pF , 5.O.OV Ceramic
R353 2.03X65.01·.088 68K Ohm , 5 %, 1/4W Carbon C 36.O 2.02X7.05.O ·366 .0 ..0.033 pF , 5.O.OV Ceramic
R354 2.03X65.O.O·762 3.3K Ohm, 5 %, 1/4W Carbon C361 2.02 X7.05.O ·483 .0 ..01 uF, 5.O.OV Ceramic
R355 2.0 3X92.05·143 6 .8K Ohm , 5 % , 3W Metal Oxide C362 2'o2X72.03·.032 .0 ..01 uF , 5.OV CeramiC
R358 2.03X56.01 ·833 47K Ohm , 5 %, 1/2W Carbon e.*C363 2.03X 127.O·95.O 76.0.0 pF, 1.5 KV P.P.
R36.O 2.03X65.O.O·561 47.0 Ohm , 5 % , 1/4W Carbon *C365 2.03X 12.01 ·265 .0 .33 uF, 2.O.OV P.P.
R361 2.03X65.O.O·886 1'oK Ohm , 5 % , 1I4W Carbon C366 2.03X.O.019·029 22 uF, 25V Electrolytic
R362 2.03X9.014·645 1.8K Ohm , 5 % , 1W Metal O x ide C367 2.02X8.065· 162 6 pF, 5.O.OV Ceramic
* R363
R364
2.04X145O·555
2.03X65.O.O·246
3 .3K Ohm, 5 %, 5W Metal Oxide
22 Ohm, 5 % , 1/4W Carbon
C368
C372
2.03X 16.00·634
2.03X12.07 · 125
.0 ..033 uF, 5.OV Ceramic
.0 .1 uF, 1.O.OV PP
R365 2.03X65.01 ·.O.02 33K Ohm , 5% , 1/4W Carbon C38.O 2.02X72.O.O·118 82.0 pF, 5.OV Ceramic
R367 203X65.O.O·886 1'oK Ohm , 5 % , 1I4W Carbon <1:>C5.01 2.03X181.O·149 .0 .1 uF, 125V Mylar
R368 2.03X56.02·185 33'oK Ohm . 5 %, 1/2W Compo <1:> C5'o2 2.02X 7.05.0·282 1500 pF, 5.O.OV Ceramic
 MAIN BOARD (CONT.)
Ref. No. Part No. Description Ref. No. Part No. Description

CAPACITORS (CONT.) SEMICONDUCTORS (CON T.)

~C503 202X7810-214 2200 pF, 125V Ceramic 0209 200X3181·523 Transistor (NPN) 2SC1851GR
&C504 202 X7810·214 2200 pF, 125V Ceramic 0210 200X3181 ·523 Transistor (NPN) 2SC1851GR
C505 203)(0220·075 560 uF, 200V Electrolytic 0301 200X3181·523 Transistor (NPN) 2SC1851GR
C506 203X0040·034 22 uF, 160V Electrolytic 0302 200X3207 ·306 TranSistor (NPN) 2SC2073LBGL2
C507 203X0041 ·057 47 uF, 160V Electrolytic 0303 200X3207·306 Transistor (NPN) 2SC2073LBGL2
C701 203X0019·092 1000 uF, 25V Electrolytic 0351 200X3248·217 Transistor (NPN) 2SC2482BK
C702 203X0634 -061 10 uF , 100V Electrolytic 0352 200X4589-802 Transistor (NPN) 2S0898B
C703 202X7050·248 1000 pF, 500V Ceramic IC301 200X2300-033 IC HA11423
&*IC501 200X2600·183 IC STR381
SEMICONDUCTORS
0203 201 X201 0·159
201 X201 0-159
Diode, IS2076·27
Diode , IS2076·27
TRANSFORME RS & CO ILS
0204
L351 201X4710·134 Coil , RF Choke
0205 201X2010·159 Diode, IS2076·27
L352 201 X5000-083 Coil, Horiz. Size.
0206 201 X201 0·159 Diode , IS2076·27
L701 611XOO04·007 Coil, AOG.
0207 201 X201 0·159 Diode, IS2076·27
T351 202X 1300·080 Transformer, Hor. Drive
0208 201X2010·159 Diode, IS2076·27
&*T352 200X9720·280 HV·Unit M-9
0209 201 X201 0-159 Diode, IS2076·27
0301 201X2010·165 Diode , ISS81
0302 201 X201 0-159 Diode, IS2076·27 MISCELLANEOUS
0303 201 X201 0·159 Diode, IS2076·27
Diode, RH·IV 6 F501 204X7120·073 Fuse , 4 Amp _125V
0304 201 X2120·009
201 X2120·009 Diode, RH·IV J402 206X5008·632 Recep W Wire 3P·M·8G
0305
201 X201 0·159 Diode , IS2076·27 P201 204X9601·466 Plug , PWB 6p·J
0306
P202 204X9601 -477 Plug , PWB 6P·0
~ 0501 201X3120·216 Diode, RM·1AV
201 X3120·216 Diode, RM·1AV P401 204X9600·298 Plu g, PWB 4p·B
& 0502
201 X3 120·216 Diode , RM·1AV P501 204X9600·249 Plug , PWB 2P·B
&0503
201X3120·216 Diode, RM·1AV P601 204X9600·304 Plug, PWS 4P·C
&0504
Diode, RU·2V TH501 201 X0100·112 Thermistor
0701 201 X2130·234
0702 201 X2120·009 Diode, RH·1V
0201 200X3181·523 Transistor (NPN) 2SC1815GR
0202 200X3181 ·523 Transistor (NPN) 2SC1815GR FINAL ASSEMBLY PARTS
0203
0204
200X4056·260
200X4056·260
Transistor (PNP) 2SA562·Y·TM
Transistor (PNP) 2SA562·Y-TM
t;,* 200X1200·497
205X9800·175
370KSB22 Pix Tube
Lateral/Purity Assembly
0205 200X4056·260 Transistor (PNP) 2SA562·Y·TM t;, * 202X1111·177 Yoke Deflection
0206 200X3 181·523 Transi stor (NPN) 2SC1815GR 291 X5003·837 Automatic Degaussing Coil
0207 200X3181·523 Transist o r (NPN) 2SC1815GR
0208 200X3181·523 Transistor (NPN) 2SC1815GR

NECK BOARD

RESISTORS CAPACITORS
R401 203X6000·780 330 Ohm, 5% 1/4W Carbon C401 203X1100·072 1500 pF, 500V Mylar
R402 203X91 04·824 15K Ohm, 5% 2W Metal Oxide C402 203X1100·122 1800 pF, 500V Mylar
R403 203X6000·661 150 Ohm , 5% 1/4W Carbon C403 203X1100·122 1800 pF , 500V Ceramic
R404 203X6000·998 1.2K Ohm , 5% 1/4W Carbon C404 202X7050·483 0.01 uF , 500V Cerami c
R405 203X6000·780 330 Ohm, 5% 1I4W Carbon C405 202X7110·019 1500 pF, 2KV Ceramic
R406 203X9104-824 15K Ohm, 5% 2W Metal Oxide
R407 203X6000·661 150 Ohm, 5% 1/4W Carbon
R408 203X6000·998 1.2K Ohm, 5% 1/4W Carbon SEMICONDUCTORS
R409 203X6000· 780 330 Ohm, 5 % 1/4W Carbon 0401 200X3248·217 Transistor (NPN) 2SC2482BK
R410 203X91 04·824 15K Ohm , 5% 2W Metal Oxide 0402 200X3248·217 Transistor (N PN) 2SC2482BK
R411 203X6000·661 150 Ohm , 5 % 1/4W Carbon 0403 200X3248-217 Transistor (NPN) 2SC2482SK
R412 203X6500·468 180 Ohm , 5% 1/4W Carbon
R413 203X6000·998 1.2K Ohm , 5% 1/4W Carbon
R414 203X5201·314 2.7K Ohm , 5 % 1/2W Composition MISCELLANEOUS
R415 203X5201·314 2.7K Ohm , 5 % 1I2W Composition J401 206X5008·628 RECEP W Wire 4p·M·SO
R416 203X5201 ·314 2.7K Ohm , 5% 1/2W Composition J402 204X9400·254 Plug , PWB 3p·A
R417 203X9105·185 2.7 Ohm, 5%, 2W Metal Oxide P403 204X9600·981 Plug , Pin 1P·O
VR401 204X2115·014 500 Ohm·S Semi·Fixed 204X9301·671 CRT Socket
VR402 204X2115·006 5K Ohm·S Semi·Fixed
VR403 204X2115-014 500 Ohm ·S Semi· Fixed
VR404 204X2115·006 5K Ohm·S Semi·Fixed
VR405 204X2115·006 5K Ohm·S Semi·Fixed
 ~-­

"'0 a"UN IlII! XIOI. ~

XiQ2.1

~­
I

R \ I~
{.lO(
_~?03 aEAM LIMITER
X304--SLAI;I'(IN(;
2SC454C
2SA673
--­ -­
f
tl.. no " ~
~
.
ICOI POWER REGuLATOR
STRl8l '~SU-II03A I J. .0';"
MAIN PCB ASSY
_______L
"'.01 '0') ----~­

-Pl·.·"
.119 <:I J
4.' lWO';'
: no "l ""

,.07
. 1.., .0 4'
I()f'TlONIl ...

~ C',
X 701 X-RAY PROTECTOR X!tO I H. DRIVE
25CI507 2SC2:l7!V XQ I H OUT
25C434C 0' 2S( 1665
25C2611 Of 2SC2'610BK ~~~~::
 !

03 and xloe VIDEO AMP: ?9C4S4C 01 25C 168'

04 and XIOS VIOEO AM~ 2SA673C

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Schematic Notes
Unless otherwise specified
Resistance: (n) (K-Kn. M-Mn). 1/4 (W) carbon resistor
Capacitance: 1 or higher- (pF). less than 1- VF)
working volt~ge - 50 (V)
ceramir; capacitor
Inductance: (;I H)
Electrolytic Cap: Capacitance Value (r F)/working voltage (V).
""'"'M'---­
V V'.c~ r .. 14·(;J
NP - non-polar (or bipolar) electrolytic cap .
Refer to the parts list for additional component information.
~ indicates test point connection
,J, indicates chassis ground unless otherwise specified
Hz indicates cycles per second
For safety purposes (and continuing reliability)
& replace all components marked with safety symbol with
identical type.
NOTE: FR - fusible resistor ,~ )
G07-FBO Parts identification on circuit boards:
00-4147-03 e.g. SU1126A (R107 = R1107)
SU3030A (R113 = R3113)
REPLACEMENT PARTS LlST-ELECTROHOME 13" MONITOR

Components identified by the & symbol in the PARTS LIST and on the Schematic have special characteristics
important to safety.
DO NOT degrade the safety of the set through improper servicing.

Abbreviations for Resistors and Capacitors

Resistor Capacitor
CR Carbon Resistor CCap. Ceramic Capacitor
Comp. R Composition Resistor M Cap. Mylar Capacitor
OM R Oxide Metal Film Resistor E Cap. Electrolytic Capacitor
VR Variable Resistor BP E Cap. Bi-Polar (or Non-Polar)
MFR Metal Film Resistor Electrolytic Capacitor
CMFR Coating Metal Film Resistor MM Cap. Metalized Mylar Capacitor
UNFR Nonflammable Resistor PP Cap. Polypropylene Capacitor
FR Fusible Resistor MPPCap. Metalized PP Capacitor
PS Cap. Polystyrol Capacitor
Tan. Cap. Tantal Capacitor
NOTE: When ordering replacement parts please specify the part number as shown in this list including part name, and
model number: Complete information will help expedite the order.
Use of substitute replacement parts which do not have the same safety characteristics as specified, may create shock,
fire or other hazards. For maximum reliability and performance, all parts should be replaced by those having identical ·.
specifications.

SERVICE REPLACEMENT PARTS LIST Main P.C.B. Ass'y (SU-1103A) Parts List
Resistors
Symbol Description Part Number Symbol Description Part Number
Main PC.B. Ass'y SU-1103A R1406 V R 200.0 QVZ3230-022
CRT Socket PC.B. Ass'y SU-3016A R1408 V R 200.0 QVZ3230-022
R1410 CMF R 6.8Q1WJ QRX019J-6R8
Outside of the p.e.B. Ass'y R1414 OM R 3.3K.o1W J QRG019J-332
Symbol Description Part Number R1415 OM R 2.7K.o1W J QRG019J-272
&V01 &Picture Tube 13" 370ESB22(E) R1421 OM R 12K.o2W J QRG029J-123
&DY01 &Deflection Yoke C29123-V R1422 V R 10KD QVZ3224-0 14H
PC Magnet A76366-A &FR1401 &F R 68.o2W K QRH024K~80M
Wedge C30006- &R1503 &CMF R 11.8.o){W +1% QRV142F-1182
&Flyback Transf. A19183-A R1504 V R 5K.o QVZ3230-053
&R11 &Focus V R A46606-A R1509 OM R 10KD2W J Q RG029J-1 03
&R05 UNF Resistor 220.o,25W K QRF258K-221 R1511 OM R 5.6K.o2W J QRG029J-562
&C04 &C Capacitor 150pF, A C1.5KV QCZ0101-005 R1514 OM R 680D2W J QRG029J~81
X01 Si. Transistor 2SD869 R1515 CMF R 8.2Q1W J QRX019J-8R2
IC01 IC Regulator STR383 R1522 CMF R 4.7.o1W J QRX019J-4R7
L01 Degaussing Coil 21-1007-31 R1523 OM R 56.o2W J ORG029J-560
Degaussing Coi l Pin Terminal (2) 34-708-01 R1528 OM R 390Q1W J ORG019J-391
Degaussing Coil Pin Terminal R1534 ZN R ERZ-C05ZK471
Housing 34-709-01 VR1501 ZN R ERZ-C05DK271
Groundstrap Ass'y 34-697-04 &R1703 &CMF R 39K.o~W +1% QRV122F-3902
Groundstrap Wire Terminal 34-228-03 &R1704 &CMF R 7.68K.o){W +1% QRV142F-7681
Groundstrap Spring (2) 35-3560-01 &R1901 &Posistor A75414
BR Support Bracket RH 35-3919-01 R1902 UNF R 2D7WK QRF076K-2RO
BR Support Bracket LH 35-3919-02 R1903 CMF R 5.6.o3WJ QRX039J-5R6
SC SCREW 1O-~ Pix Tube Mtg. (4) 31-631018-08 R1904 OM R 10K.o2W J Q RG026J- 103Z
WA Pyramidal Lockwasher (4) 33-255-01 &FR1901 &F R 220.o~W K QRH124K-221 M
Clip PC.B. Support (2) 33-629-02
Ground Lug 34-33-04
CH Chassis Base 38-452-01
Main P.C.B. Ass'y (SU-1103A) Parts List CRT Socket P.C.B. Ass'y (SU-3016A) Parts List
Capacitors Resistors
Symbol Description Part Number Symbol Description Part Number
C1402 Tan. Cap. 2.2uF 16V K QEE51 CK-225B R3105 V R 200n QVZ3234-022
C1411 E Cap. 100uF 160V A QEW52CA-107 R3106 V R 200n QVZ3234-022
C1412 E Cao. 3.3uF 160V A QEW52CA-335 R3113 V R 5Kn QVZ3234-053
C1508 PP Cap. 5600pF 50V J QFP31 HJ-562 R3114 V R 5Kn QVZ3234-053
C1511 E Cap. 47uF 160V A QEW52CA-476S R3115 V R 5Kn QVZ3234-053
&C1512 &PP Cap. 2000pF DC1500V J QFZ0082-202 R3116 OM R 10Kn2W J QRG029J-103
&C1513 &pp Cap. 2000pF DC1500V J QFZ0082-202 R3117 OM R 10Kn2W J QRG029J-103
.6C1514 &pp Cap. 2500pF DC1500V J QFZ0082-252 R3118 OM R 10Kn2W J QRG029J-103
C1515 PP Cap. 0.53uF DC1200V K QFZ0067-534 R3119 Comp o R 3.3Kn Y:!W K QRZ0039-332
C1520 BPE Cap. 1uF 50V A QEN61 HA-105Z R3120 Comp o R 3.3KnY:!W K QRZ0039-332
C1524 M Cap. 0.1uF 200V K QFM72DK-682M R3121 Compo R 3 .3Kn )l,W K QRZ0039-332
C1904 E Cap. QEY0034-001
C1905 E Cap. 10uF 250V A QEW52EA-106 Capacitors
&C1907 &MM Cap. 0.1uF AC150V Z Q FZ9008-1 04 Symbol Description Part Number
C3107 E Cap. 10uF 250V A QEW52EA-106
Coils C3108 C Cap. 1000pF DC1400V P QCZ9001-102M
Symbol Description Part Number
L1501 Peaking Coil A75360-6 Coils
L1502 Liniarty Coil A39934 Symbol Description Part Number
L1503 Width Coil C30380-A L3101 Peaking coil QQL043K-101
L1504 Heater Choke C30333-A
L1901 Line Filter A39475-J Semiconductors
Symbol Description Part Number
Transformers
X3101 Si. Transistor 2SC2611
Symbol Description Part Number X3102 Si. Transistor 2SC2611
T1501 Hor. Drive Transf. A46022-BM X3103 Si. Transistor 2SC2611
T1503 Side Pin Transf. C39050-A
Miscellaneous
Semi­ Symbol Description Part Number
conductors
& CRT Socket A75522
Symbol Description Part Number
IC1501 I.C. HA11244
X1101 Si. Transistor 2SC1685(R)
X1102 Si. Transistor 2SA673(C)
X1103 Si. Transistor 2SC1685(R)
X1104 Si. Transistor 2SA673(C)
X1105 Si. Transistor 2SC1685(R)
X1106 Si. Transistor 2SA673(C)
X1301 Si. Transistor 2SC1685(R)
X1302 Si. Transistor 2SC1685(R)
X1303 Si. Transistor 2SA673(C)
X1304 Si. Transistor 2SC1685(R)
X1305 Si. Transistor 2SC1685(R)
X1401 Si. Transistor 2SD478
X1402 Si. Transistor 2SD478
X1501 Si. Transistor 2SC2610BK
X1701 Si. Transistor 2SC1685(P-S)
D1101 Si. Diode W06A
D1102 Si . Diode W06A
D1103 Si. Diode W06A
D1301 Si. Diode 1S2473H
D1401 Si. Diode 1S2473H
D1402 Zener Diode RD10F(C)
D1503 Si. Diode HF-1
D1504 Si. Diode V09E
D1505 Zener Diode RD11 E(B)
D1506 Si . Diode W06A
D1507 Si . Diode 1SS81
D1508 Si. Diode 1S2473H
& D1701 &Zener Diode D20EV2
&D1901 &Si . Diode 1S1887A
&D1902 &Si. Diode 1S1887A
&D1903 &Si. Diode 1S1887A
&D1904 &Si. Diode 1S1887A

Miscellaneous
Symbol Description Part Number
&F1901 &Fuse 1A QMF53U1-1ROS
&F1902 '&UL Fuse 3A QMF66U1-3ROS
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