ORDER NO.

$D83062525C8

Service Manual Stereo Integrated DC Amplifier

SU-Z55
(E], [EGA], [EK], [EF], [EH].
[EB], [Ei], [XA], [XL], [PC]
SU-Z55(k)
[E], [EGA], [EK], [EH].
[EB], [XA], [PC]
Areas

is available in Switzerland and Scandinavia.

is available in F. R. Germany.
is available in United Kingdom.
is available in France.
is available in Holland.
is available in Belgium.
is available in Italy.
is available in Southeast Asia, Oceania,
Africa, Middle Near East and Central
* The colors of this model include silver and black, South America.
is available in Australia.
* The black type model is provided with (K) in the Service Manual.
is available in European Audio Club.

Specifications (Specifications are subject to change without notice for further improvement.)

(DIN 45 500) ai
@ AMPLIFIER SECTION rated power (40)
PHONO 75 dB (IHF, A: 81 dB)
40 Hz~ 20 kHz continuous power output TUNER, AUX/CD/VIDEO, TAPE 1, 2
86 dB (IHF, A: 97 dB)
both channels driven 2 X 45W (40)
2 X 40W (80) —26 dB power (4)
1 kHz continuous power output PHONO 65 dB
both channels driven TUNER, AUX/CD/VIDEO, TAPE 1, 2 65 dB
2X 50W (49)
2 X 42W (89) 50 mW power (42) ee
Total harmonic distortion PHONO
TUNER, AUX/CD/VIDEO, TAPE 1, 2 62 dB
rated power at 40 Hz~20 kHz 0.05% (42)
0.03% (8) Tone controls
rated power at 1 kHz 0.05% (4) BASS 50 Hz, +10 dB~ —10 dB
0.03% (82) TREBLE 20 kHz, +10 dB~ —10 dB
half power at 40 Hz~20 kHz 0.05% (49) Loudness control (volume at —30 dB) 50 Hz, +9 dB
0.03% (8) Output voltage and impedance
half power at 1 kHz 0.007% (42) REC OUT 150 mV
0.005% (8Q) Channel balance, AUX/CD/VIDEO 250 Hz~6,300 Hz +1 dB
~26 dB power at 1 kHz 0.01% (40) Channel separation, AUX/CD/VIDEO 1 kHz 50 dB
50 mW power at 1 kHz 0.01% (49) Headphones output level and impedance 420 mV/330
Intermodulation distortion Load impedance
rated power at 250 Hz: 8 kHz=4:1, 40 0.05% MAIN or REMOTE BQ-~ 160
rated power at 60 Hz: 7 kHz=4:1, SMPTE, 8Q 0.03% MAIN and REMOTE 4N-~160
Power bandwidth
both channels driven, —3 dB 10 Hz~25 kHz (49) @ GENERAL
10 Hz~25 kHz (82) Power consumption 310W
Residual hum and noise 0.8 mV Power supply
Damping factor 20 (40), 40 (89) For United Kingdom and Australia AC 50 Hz/60 Hz, 240V
Input sensitivity and impedance For continental Europe AC 50 Hz/60 Hz, 220V
PHONO 2.5 mV/47kQ For others AC 50 H2z/60 Hz, 110V/120V/220V/240V
TUNER, AUX/CD/VIDEO, TAPE 1, 2 150 mV/22kQ Dimensions (WXHXD) 430 X 86 X240 mm
PHONO maximum input voltage (1 kHz, RMS) 150 mV (16-15/16
"x 3-3/8"'x9-7/16")
Frequency response Weight ' 5.1kg
PHONO RIAA standard curve
+0.8 dB (30 Hz~15 kHz) Note:
TUNER, AUX/CD/VIDEO, TAPE 1, 2 Total harmonic distortion is measured by the digital ssectrum
10 Hz~80 kHz (-3 dB) analyzer (H.P. 3045 system).

Technics Matsushita Electric Trading Co., Ltd.

PO. Box 288, Central Osaka Japan
@ CONTENTS
Page Page
SAFETY PRECAUTIONS ........-..--2+2 eee ee 2 PRINTED CIRCUIT BOARDS) ...... 2.2.22 ee eeee 7
BEFORE REPAIR AND ADJUSTMENT ......-.-..4.- 2 POWER AMPLIFIER PROTECTION...........-..6. 10
LOCATION OF CONTROLS ........022 22 tee eee 3 FLUORESCENT LEVEL METER .........220005 10
PROTECTION CIRCUITRY ........--2 020 eee eee 3 BLOCK DIAGRAM)... wf ee ee ee 11
DISASSEMBLY INSTRUCTIONS .........2+-2-055 4 SCHMATIC DIAGRAM... 1... ee ee ees 13
RESISTORS & CAPACITORS) ... 1... ee eee ee es 6 REPLACEMENT PARTS LIST ..........2020005 16
EXPLODED VIEW ww Le es 17

Wi SAFETY PRECAUTIONS
. Before servicing, unplug the power cord to prevent an electric shock.
. When replacing parts, use only manufacturer’s recommended components for safety.
. Check the condition of the power cord. Replace if wear or damage is evident.
. After servicing, be sure to restore the lead dress, insulation barriers, insulation papers, shields, etc.
— . Before returning the serviced equipment to the customer, be sure to make the following insulation
OfhwWN resistance test to
prevent the customer from being exposed to a shock hazard.

e INSULATION RESISTANCE TEST

1. Unplug the power cord and short the two prongs of the plug with a jumper wire.
2. Turn on the power switch.
3. Measure the resistance value with ohmmeter between the jumpered AC plug and each exposed metal cabinet part, such as
screwheads antenna, control shafts, handle brackets, etc. Equipment with antenna terminals should read between 3MQ
and 5.2MQ to all exposed parts. (Fig. A) Equipment without antenna terminals should read approximately infinity to
all exposed parts. (Fig. B)
Note: Some exposed parts may be isolated from the chassis by design. These will read infinity.

Antenna
terminal

Exposed Exposed
metal metal
part part

Ohmmeter Ohmmeter

(Fig. A) (Fig. B)
Resistance = 3M2—5.2MQ Resistance = Approx oo

4. If the measurement is outside the specified limits, there is a possibility of a shock hazard. The equipment should be
repaired and rechecked before it is returned to the customer.

lM BEFORE REPAIR AND ADJUSTMENT

1. Turn off the power supply and short-circuit of power supply capacitors ( C406, 6800HF and C407, G800 HF) at
resistance (about 102, 5W) in order to discharge the charged voltage. Do not short between C406 and C407 by
screwdriver. It may damage the componet.
2. Before turning on the power supply after completion of repair, slowly apply the primary voltage by using a power
supply voltage controller to make sure that the consumed current is free of abnormality. The consumed curremt at
60Hz/50Hz in no signal mode is shown below with respect to supply voltage 110V/120V/220V/240V.

Power supply voltage AC110V AC120V AC220V AC240V

200 ~ 400mA 180 ~ 355mA 100 ~ 200mA 90 ~ 180m

Cousumed current
185 ~ 370mA 160 ~ 320mA 95 ~ 190mA 85 ~ 165m
 Aux/CD/Video
Input selector
indicators tuner Input selectors
Tone indicators
Power switch phono
Peak-power
indicators
(HM Source, = tape 1/dubbing 1 B® 2
Balance
indicators
(@ Source, = tape 2/ext)

Tape-monitor
selector

Main Remote Bass

Balance Volume
Headphones contrel Loudn i
dness switch
control ( B off,m on)
jack Speaker T \
selectoe ‘one controls
switch

Main speakers

Play back ob AC outlets

Tape {- ed: (For [XA, PC] area only}
Rec out

Voltage selector
Phono Tuner (For [XA, PC] area only)
input input
Remote speakers

@ The power supply for this unit varies depending upon the areas. Also, the parts used for power supply are different.
So, refer to the ciucuit diagram and the replacement parts list.
* [XA, PC] area is provided with voltage selector and AC outlet.
* 240V (ro/60Hz) for Australia and United Kingdom.
* 220V (50/60Hz) for Continental Europe.
* 110V/120V/220V/240V (50/60Hz for other [XA, PC] area.
Phono input capacitance is about 150pF.

@ PROTECTION CIRCUITRY
The protection circuitry may have operated if either of the If this occurs, follow the procedure outlines below:
following conditions is noticed: 1. Turn off the power.
@ No sound is heard when the power is turned on. 2. Determine the cause of the problem and correct it.
® Sound stops during a performance. 3. Turn on the power once again after one minute.
The function of this circuitry is to prevent circuitry damage
Note
if, for example, the positive and negative speaker connec- When the protection circuitry functions, the unit wil not
tidn wires are “shorted’’, or if speaker systems with an
operate unless the power is first turned off and ther7 on
impedance less than the indicated rated impedance of this again.
unit are used.
li DISASSEMBLY INSTRUCTIONS
© How to remove the cabinet and front panel.
1. Remove the 2 setscrews [Fig. 1: @, @ ] on the Patines wa
side and 3 setscrews [Fig. 1: @ ~ @ 1] on the
rear panel of the cabinet.
2. Remove the cabinet upward.
2]
3. Remove the 3 setscrews [Fig. 1: @ ~ @ ] to
remove the front panel in the direction of the
arrow.

e@ How to remove each switch P. C. B. attached

to the front panel. [Fig. 2]
Pull out the lead wires connected from main P. C. B.
to input selector and FL P. C. B. [See Fig. 2—1.]
1, Remove the cabinet and front panel. [Fig. 1]
[See Fig. 1.]
No.To remove the input selector P. C. B., release the claw in the direction
of arrow @), and pull out the P. C. B. toward th.
back of front panel.
3. To remove the FL P. C. B., release the claw in the direction of
arrow), and pull out the P. C. B. toward the back of front
panel.
4. To remove the power switch P. C. B., remove setscrew ©.

Note: [XA], [PC] area only

To remove the front panel, remove the 2 setscrews. (Refer to EXPLODED
VIEW on page 17)

5. To remove the speaker selector P. C. B., release the claw in the direction of arrow ©, and pull
out the P. C. B. toward
the back of front panel.
6. To remove the volume P. C. B., release the claw in the direction
of arrow ©, and pull out the P. C, B, toward the back of
front panel.
FLP.C.B.
Sub-panel

Input selector P. C. B. Power switch P. C, B,

Front panel Speaker selector P. C. B.

t Mt Read wires

ae Connect

Lead wires
[Fig. 2—1]

Volume control Loudness switch

Slide volum
Volume P. C. B.

[Fig. 2] Volume P. C. B.

[Fig. 2—2]
e How to remove the front panel and sub-panel Front panel
[Fig. 3] Sub-panel
1. Remove the cabinet and front panel. [See Fig. 1]
2. Remove each switch P. C. B. attached to the front
panel. [See Fig. 2]
3. Release the 5 claws at the top and the 4 claws at
the down of the sub panel, and then remove the
front panel asland as in Fig. 3.

[Fig. 3]
Claw
Pliers etc. Sub-panel
e How to remove the bass, treble and balance Input selector button
contro! buttons
1. Remove the front panel and sub-panel.
\
[See Fig. 3] Cloth = <a ‘eo.
2. Shift the slide knob to the left-hand end, then
remove it by using the pliers etc. wrapped with Slider

cloth. [Fig. 4—1] Pushing screw driver

e How to remove the 3 input selector knobs [Fig. 4—1] [Fig. 4-2]
1. Remove the front panel and sub-panel.
(See Fig. 3]
2. Remove the 3 knobs by pushing then from inside
Sub-panel
the sub-panel by using of a screwdriver or the like.
Slide Slider

Oe
[ Fig. 4-2] knob

e How to remove the volume control button

1. Remove the front panel and sub-panel.
[See Fig. 3]
2. Release the sub-panel claw in the direction of
arrow ©, and pull it out toward the back of sub-
panel. Remove it by using a blade screw driver
wrapped with cloth. [Fig. 4-3]

e How to remove the power amplifier IC [Fig. 5]

1. Remove the 4 set screwes [ Fig. 5: Q@ ~ ®] on
the chassis and then remove the main P. C. B. with
heat sink from the chassies.
N Un solder of power IC.
3. Remove the 2 set screwes [Fig 5: @ , ® |
used to secure the power IC on the heat sink, and
then pall the power IC.
Note: When mounting the power IC, apply silicone
compound or equivalent heat diffuser to the
rear side of power IC, and then follow the
step 1 ~ 3 reversely.
@ RESISTORS & CAPACITORS
Notes: 1. Part numbers are indicated on most mechanical parts. 3. The "® mark is service standard parts and may differ from
Please use this part number for parts orders. production parts.
2. Important safety notice: 4. The unit of resistance is Q(ohm),
Components identified by A mark have special characteristics K = 10000, M = 1000k?.
important for safety. When replacing any of these components 5. The unit of capacitance is UF (microfarad).
use only manufacturer's specified parts. P = 10° uF
6. Bracketed indications in Ref. No.Columns specify the area.
Parts without these indications can be used for all areas.

Resistor Type Tolerance Voltage

Capacitor Type Tolerance
ERD Carbon +2% ECEA Type Others
ERG Met ‘al Oxide > + 5%
Electrolytic 10V 50V : + 0.25pF
Ceramic 16V 16V tO0.5pF
Ceramic 25V 400V AC + 20%
Polyester : 50V 100V > 45%
Electrolytic 63V 45V DC > + 10%
ERDIOTLJ OOO
Polyester 35V 500V DC +80%, —20%
~» Chip type carbon
50V 250V AC : 4 30%
ERO1OMKGOOO — Chip type metal film
+100%, ~0%
V2NACEOO

ERD 25 F J 101

Type Wattage Shape Tolerance Valve Type Voltage Value Tolerance — Peculiarity

ERG 2 AN J 2R2 50 M R47 R

Type Wattage Shape Tolerance Valve Voltage Peculiarity Value Special use

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

RESISTERS RESISTERS
R1,2 ERDI10TLJ391U R402 © |ERD25TJ153 C303, 304 ECEA1HS100
R3,4 EROLOMKG2213 R403 A |ERD2FCG331 C305, 306 ECCD1H101K
R5,6 EROLOMKG5622 R404 © JERD25TJ393 C307, 308 ECCD1H820K
R7,8 ERDIOTLJ271U R405 A {ERDSIFJ471 C309, 310 ECKD1H681KB
R9,10 ERDI0TLJ680U R406 A |ERDS1FJ271 C311, 312 ECCD1H050CC
R11,12 ERDIOTLJ184U R407 ERD25FJ472 C313,314 ECCD1H100KC
R13,14 ERD10TLJ123U R408 © JERGIANJ122
R15,16 ERD10TLJ563U R409 A }ERDS1FJ220 C315, 316 ECCD1H820K
R17,18 ERDIOTLJ102U R410 A |ERDS1FJ331 C317,318 ECCD1H820K
R101,102 © {ERD25FJ391 R412 - © |ERD25TJ153 C319, 320 ECEASOZ4R7
(EGAJo nly C321, 322 ECEA50Z1
R103~112 ® ERD25FJ222 R418 ERD25FJ103 C323, 324 ECKD1H223ZF
(EGAJo nly R419 A |ERD2FCG470 C325 ,326 © |ECKD1H103ZF
R201,202 © ERD25FJ272 R501 ,502 ERD25TJ123
(EGAJo nly R503, 504 ECKD1H103ZF
R201,202 © ERD25FJ472 R505, 506
(other) R508 ,509 ECEA1ES220
R203, 204 ERD25TJ183 C331,332 A ECEALEN3R3S
R205, 206 ERD25TJ393 C350 © ECEASOZ1
R207, 208 ERD25TJ223 C401 © ECEA25Z4R7
R209, 210 ERD25FJ332 ECCD1H101k
C402 © ECEA50Z3R3
R211,212 ERD25TJ184
R213,214 ERD25FJ562
ECKD1H471KB C403 © ECEA1AS470
R215,216 ERD25FJ102
ECQM1H223KV C404 © ECEA1HS100
R301, 302 ERD25TJ223
ECQMI1H682KV C405 © ECEA1ES470
ECEA1HNO10S ECETS45V682U
R303, 304 ERD25FJ122
R305, 306 ERD25FJ102
ECEA1CS330 © ECEA50Z1
© ECEA1VS330
R307, 308 ERD25TJ124 © ECEA50Z1
R309, 310 ERD25TJ393
C103~110 © ECCD1H101K © ECEA25Z4R7
{EGA]only A ECQE1104KN
R311, 312 ERD25TJ823 C201, 202 © |ECKD1H221KB
R313,314 (EGAJo
ERD25FJ471 203,204 ECQMIH563KV
R315, 316 ERD25FJ150
C501 502 ECEA25Z4R7
R317, 318
C205, 206 ECQMIH153KV C503 ECEA1ES470
ERD25FJ332
C601 ECKDKC103PF
R319, 320 ERD25FJ272
R321 ,322 > ERD25FJ100
C207 208 ECQM1H823KV C602 @@d
PP ECKDKC103PF
R323, 324 ERGIANJ331
C209,210 ECQMIH182KV (XA, PCJonly
R401
C211,212 ECQMIHI183KV C603 A ECQE2A473MW
QQO©QQOQGOHOHOH
G©OGOGHOOOHOOO
ERD25TJ333 C301 ,302 © |ECEA50Z3R3 (EGA, EFJonly
 SU-Z55 SU-Z255
@ PRINTED CIRCUIT BOARDS HW Ground (Earth) lines ‘A Input
/Output terminal
Aux/ed| _[
|[rec our| [PLAYBACK] [Rec ouT] [PLAYBACK
TH] Speaker terminal GROUND
TUNER] eo
[en 0} [PHONO |[
Ae LINE
Ac 220v (50/40Hz)
SPEARERS)
SPEAKERS GING. a a ee
EE SA SENT OS ET A TE NS EE A TS RT Re
UO r 3 i — | ull ia | B@ &

re Power amplifier, Muting

and power supply

1!
Power
transformer

Thermal
detector

L_]S4-2 L_|:$4-4 L | S2-4 L_]$2-2 LI] si-2 LI s1-3

(REMOTE) (MAIN) (tape {) (tape 2) (tuner) (aux/CD/VIDEO) BALANCE
POWER SPEAKERS SELECTOR PHONES TAPE MONITOR INPUT SELECTOR
Selector switch [3]
 Al Input /Output terminal
{TAPE { TAPE 2/EXT
Speaker terminal ; ure | _| e Terminal guide of transistors, ' diodes and IC’s
GROUND) | [@ND] [PHONO] [TUNER] [VIDEO | [REC our] [PLAYBACK] [REC OUT] [PLAYBACK
SPEAKERS POINT | Volume control
So.
oe SS A EE A A LE NE TE A) A PE

re) Te

LOUDNESS

MA150 SVISTK2038B
MA162A

Thermal
detector
1234567

VOLUME AN7072N

SVDS2V20

Semao'CED aa:
K —fg@—A
2SA1015
2SD592ANC
SVDMZ312C
SVDMZ316

SVDSLV56VC3
SVDSLV56YC3

eas aa oe

pF ~ +. VR204

LI] Si-2 LI s{-3

(tape 2) (tuner) (aux/¢D/viDEO) TREBLE
TOR |____fiwpuT sELECToR-——!
SU-Z55
@ POWER AMPLIFIER PROTECTION @ BLOCK DIAGRAM
e Short-circuit of speaker terminals
1. If speaker terminals are short-circuited, a high level current will flow to power amplifiers,Q5 and Q6, causing
TAPE | TAPE 2
the voltage across emitter resistor R5 to increase.
Pa? rn Tea
REC OUT PLAYBACK REC OUT PLAYBACK
2. Voltage across R5 causes overload detecting transistor Q7 to turn ON.
3. Emitter voltage of Q7 (ground potential) goes to terminal (7) of |C302 through R8.
© © IC30l
4. Voltage at terminal (7) is transmitted to terminal (5) of muting IC (1C407). AN7062
VOLTAGE AMPLIFIER
5.. Calculation circuit of |C407 operates to eliminate the voltage at terminal (3) of 1C407.
6 . On operation of muting circuit of 1C301, the drive circuit of |C302 stops operating and the current from power
amplifier also stops. PHONO

Note: 1. Terminal (3) of IC407 supplies power to drive circuit of power amplifeir 1C302, and supplies control l
| Current
voltage to muting circuit of voltage amplifier 1C301.
$3 LOUDNESS Mirror
2. 1C407 is provided with muting function to prevent shock noise during power ON/OFF in addition 1 (Input selector) on
to power amplifier protection. | $2-2 gt ANd
1c 302 ei | S2-l tape 2 off O “
SVISTK2038B
Power amplifier SVINJM2043DD Isi-2 sen a we Cascade
PHONO EQUALIZER tuner 5 source
TUNER | FaUrce Votume |! Balance :
|E off (Tape i
monitor ) | Current
urrel
| stabilizer
ISI-3
|
AUX/CD t OGux7CD/video \
/VIDEO : ee |
|
(Loudness)
I
|
| Speaker
| Power s
|
| ie}

control -37.3
oy Bass
phono ( phono)
in
Time
constant
tuner Si-2 |
(tuner) I
|

aux/CD/video sis
( aux/CD/video )
!
From power
transformer
CTT UVTI EET
IC 401 S2-l -0.0r———0.05 — 50—100-
AN7072N (tape |) PUUTIUIUUOUATATOOMNATTHUTATTTUTUT OAC TVTUUTTMAT TAIT
Mute & protection circuit + “> tone control ~~~ + , 9 R
ro) ees
_ "hearson] ———_ Y_|_
Treble (8)~~ (13) (27) —~ (33)

Mi FLUORESCENT LEVEL METER $2-2

Osseti
tenaan
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alan 2a _3a 2288) Ba 6a Ta 3a 9a 10a lla 12a _B_
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Tb 2b "3b 4b Sb 7b Pepe: ob Tob 11b 12b a IC501
+S Tone Control Sa +
SVIBA6I48
> FW LEVEL COMPARATOR
a=. he (FL SEGMENT DRIVE)
panies ectOP Nest
loudness on

PIN No.

CONNECTION

PIN No.

CONNECTION

la~ 12a wo. Loch segment 1b ~12b......... Rechsegment r.......... balance (R) 2........ balance (L) F.......... filament
 @ BLOCK DIAGRAM

TAPE | TAPE 2 : TONE (Bass/Treble)

d Q6, causing 4 Sr) (| )indicates No. are right channel.
REC OUT PLAYBACK REC OUT PLAYBACK
© 0) IC 301
Headphone

AN7062
VOLTAGE AMPLIFIER
phono IC 302
nt from power ye" 14 13 SVISTK2038B
PHONO © a st oy POWER AMPLIFIER
| bi 2(15)
ipplies control
|
| $3 LOUDNESS
=F in addition (Input selector) 26
| S2-2 Sane |ee
Ic I | S2-l tape 2 off O °
SVINJM20430D Isi-2 fone <
PHONO EQUALIZER | > tuner en source
TUNER : source Volume !

[sv | [Rea
| oft (Tape monitor )

AUX/CD | aux 7CD/ video |

/VIDEO L oft
|
|
(Loudness)
\
| oA) Remote
| Speaker terminal to short
| Power switch to OFF
power | i 1
| aaa | iC401
ae ) Bass control ~37.3V are AN7072
phono phono off t Ne MUTING & PROTECTION
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tuner Si-2 neg Slagle SS
(tuner) Power Power
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aux/CD/video Si-3
(aux/CD/ video ) Power
on/off
CUTTY VLEET ETT detector
S2-l 00——0.05 ——0.25—0.5 2.5 § ____ 25 50 100- ov -- ] AT
(tape |) MUU UUEDUUERARUUUAAASRRRRRARRAMAAOROUUINORDORROORRODURERNUSDE|
+ “> tone control ~~~ + ; 69 R
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Power Speaker terminal to short
Treble (27) — (33)
transformer
$2-2
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IC501
SVIBA6I48
LEVEL COMPARATOR
(FL SEGMENT DRIVE)

acces filament
 FL Level Meter
la~i2a ich level segment
FL lb~i2b Ron level (ejPOWER AMPLIFIER, MUTING AND POWER SUPPLY
iC301 D301, 302 0301, 302 1c302
AN7062 MAI62A 250992 SVISTK20388
VOLTAGE AMP DRIVER 2ch POWER AMP

NF Line

Power Amplifier

1CS5Ol
SVIBA6I48
ich FL ORIVER
EQUALIZER | (COMPARATOR )

AN INPUT/OUTPUT TERMINAL

Left Channel Phono Signal :

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(7) 7 il 0502~ 506 Oo;
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a Ha) | \
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2 FL LEVEL METER 401 aac2,403 | Power Supply
/VIDEO Cy 2) (= 2SA1015 2SD592ANC
F TONE CONTROL 1C 40! om}oven LoA0DET}=[wTing] SWITCHING HMREGULATOR AES,
r REC OUTS ams -23] (0) B73 Ge4 Baa 29) C7 F
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as oe SWITCH
Levaveack© oe 68 o!

Rec ouT®
a3
io oe
ice #202”
TAPE 2/EXT oe waells)
(o; G)}—G)
 i SCHEMATIC DIAGRAM
(This schematic diagram may be modified at any time with the
development of new technology.)
*The part No. of transistors, IC and diodes mentioned in the schematic
| Level Meter |H| diagram stand for production part No. Regarding the part No. with
lo~t2a Lch level segment SPEAKER TERMINAL @ mark, the production part No. are different from the replacement
Ipwt2b Reh level segment
POWER AMPLIFIER, MUTING AND POWER SUPPLY part No. Therefore, when placing an order for replacement part, please
1c301 D301, 302 Q301, 302 1C302 use the part No. in the replacement parts list.
AN7062 MAI62A 250992 SVISTK2038B
VOLTAGE AMP DRIVER 2ch POWER AMP L
Ee ae Notes:
a30933FF a3 i
NF Line 7 :/ ;
7
M i eh aie,
1. This is basic circuit diagram (For continental Europe) of this unit.
;
== o:3 ; : oY ime 2. Regarding the circuits to be changed in the basic circuit diagram (For
: : a 1 SPEAKERS :
_ : Power Amplifier | continental Europe) and related areas ([EGA], [XL], [XA]} and [PC]
les
20s 5680", 182% A s eee refer to the booklet contain manual (Order No. SD83062525C8—A).
SVIBAGI4G # fool A A ie | 3. $1-1 ~ $1-3 : Input selector switch in “phono” position.
(COMPARATOR ) at

| 3s Rare g | cto (S1—1 : phono, $1—2 : tuner, $1—3 : Aux/

Ao J : 8 Slee el
|
2 2 a is“ (—~( @)
CD/Video)
® t z a 9 S © z 8 5
| ut 3i8 Eng God God Ga) Gd Gea 7] G7 Bed 2] Gea (2) Bed Gale] Gad2 4. $2—1 ~$2-2 :
.
Tape-monitor selector switch in
. .
‘‘source
a
| = = ele Lp 1301 1¢302 Protect
~ 3 3 gle o] 33 cog eg G52) Geol GF) B77] Be.) Reece <— 38.4) aa oO} cea o] Si
Position.
6 6
338 —P-_O—@—-O-O—-O-O—-B ©—9-O—D—-O@—)-O—G 3 4 (S2—1 : tape 1, S2—2 : tape 2)
q

| ww td - 2 cdte] An3ee 4 5. $3 : Loudness switch in “off” position.

- 3 BT sual 2 zl 26} [ L3oe A 6. S4—-1 ~ S$4-2 : Speaker switch (main) in on’ position.
S204
i 320 +
:
B
Speaker switch (remote) in “off” position.
7 * “a u cae

ae i¢ a 4 :
fae 3- Fs (S4—1 : main speaker, S4—2 : remote spe-
Rech FL ORIVER
car Nive
=
(COMPARATOR } aker).
j 4 7. $5 : Power source switch in “‘on’’ position.

: ri : cate 3 8. S6 ([XA] and [PC] area : Voltage selector switch in “240V" position.
|
4 “ee _ 8!
7 R502 :
_ : Bae
‘
E only) (Refer to booklet contain)
=

10V (Segment Light up) S 1 |3

—O1V |B! ; 120V <— 110V <-> 220V<—> 240V
wee 9. [__] Indicated voltage values are the standard values for the DC
a Sen Baiahics | Oo: :
S| ; : aaa eae electronic
a 7
circuit
s
tester
.
(h
(high
.
iimpedance) with
.
roun
the ground i
point taken
SVDSLV56VC3, ‘ =" 4 z as standard. Therefore, there may exist some errors in the voltage volues,
INPUT INDICATOR Bar Switch : Muting
a SvOsV 506
0502~ seca = —_ aa I depending
i on the internal
j impedance
i of the DC circuit
1 i tester.
MUTING & PROTECTION \ Se

LEVEL METER ie TI SSS 20:

2SA 1015 250592 ANC |Power Supply
Fosoe.aos I 2)a(2 3524 )a(23)u(28)a(28 ee
Components identified by A .
mark have special characteristics important fone
NE CONTROL 1C.40) |[ovenLoad0€T}-{wuTing] SWITCHING M REGULATOR RERTE a ‘ ‘
C3 (2) Bg Beg Bea Fog G7) G9) 3 er oy for safety. When replacing any of these components, use only manufacture-
.r-O—-O) +) -O—-O©-—-F isk 0403 E main B ie
Tp *esian 3 be = ass 330 ta G0 E free te r’s specified Parts.
‘ at (et labd 12 EL) $8) QL . oe al - q] i ! ; 11, Phono signal lines of left channel.
JME CONTROL H |}S| ig|g |#89) erJak S8h Fs98
FER zy
el Feloao: cay
me si ls
wi | |ere Sa
Ll its
ge
Laks
Gt
yor a
:
E 12.
: ;
NF Signal lines of left channel.
veens | |_ $3 Ss Tile [yo |S i LP Ese : re .
—~ i: b 5
4 3g
| gs A “Ee& a tih3 FIR i. pepe encoun 13, > Positive (+B) voltage line.
est] t]8 A+ ot . :
4, ) oao2 Fs. STs Peaeerer alg: #t G: 7 ie 14, = => Negative (—B) voltage line.
gee | !
d fA. “al | le i i
L sey! 1g ab oe ia io) lott =~on!
= / IDBO, vascs| 3zal if last,g ae
ae 2 e [ews f ae
835» ; syle & ) * p3zq HEADPHONES J
pstrtriorterecie eerie tse repose assafa pes
Rpts D / ao \Veo 2S8 82 : 3: D401
maiso D402
SVOMZ312C 0403, 404
SVDMZ316 0405 ~ 408
sv0s2v20 !
DY
‘
Tekh se 5 gg Fy | eas A g Gia me _ l2V ZENER 16V ZENER RECTIFIER Py Ree A
=e =8 g : SPEAKER
4 [ i
fasten Son / y ine J: 4 Seals
; 5 R i SWITCH 3
ee : 3 (BALANCE) ; E = = £330 E a on A R40.

eee)
Ze ccd ;/ =a 1; aoe Be r GBs!
GeGS a = = ‘ os
Sahel
ona FL Tone Bass “6 = 2 2 Ey dase isons
Bar Switch Treble/ IH ee Wane G2 = - a ®
asf
 @ REPLACEMENT PARTS LIST @ EXPLODED VIEW
Notes: 1. Part numbers are indicated on most mechanical parts. Please use this part number for parts order.
2. Important safety notice: Components identified by A, mark have special characteristics important for safety.
When replacing any of these components, use only manufacturer’s specified parts.
3. @® —marked parts are used for black only, while © —marked parts are for silver type only.
4. Part other than @ — and O-—marked are used for both black and silver type.
5. Bracketed indications in Ref. No.Columns specify the area, Parts without these indications can be used for all areas.
6. The Se mark is service standard parts and may differ from production parts.
7. The parenthesized numbers in the column of description stand for the quantity per set.

Black type model No. : SU—Z55(K)

INTEGRATED CIRCUITS
Description Ref. No.
[ne
|ain |oe
CABINET and CHASSIS PARTS CABINET and CHASSIS PARTS
SGUUZ55—E Transparent Cover 30(XA, PCJonly |SJS601—2 Socket, AC Outlet
A (1)
SVISTK2038B SBC571
AN7072N 31(XA, PC) SKUUZ55—SX |Bottom Board
SVIBA6148 Comparator SBC369—2 only Chassis (1)
31 (other) SKUUZ55—SE |Bottom Board
SBW423 Button, Phono
Driver SBW423-1 Button, Tuner 31-1 (SHS2481
2SA1015—Y Switching SBW423—2 Button,
2SD592ANC—Q_ |Regulator SUS191—2 Spring, Button 32(XLonly RJT202B
SBC315—3 Button, Speaker SMC1127
Selector
$BC337—-1 Button, Power (
Bias
12V Zener XTB3+8BFN
SKC1550S1 Cabinet, (Silver) (1)
SVDMZ316 16V Zener
D405~408 A\ |SVDS2V20 Rectifier SKC1550BB1 Cabinet, (Black) (1) SNE2095—2
D501 SVDSLV56VC3__|LED, Power N2 SNE2095—3
D502~506 SVDSLV56YC3_ |LED, Selector SGXUZ55— SE Front Sub Panel,
Ass’y(Silver) (1) N3(XA, PC) XSN3+6S
SGXUZ55— KE Front Sub Panel, only ©
Ass'y(Black) — (1) N4 XTBS3+8BFZ1 Tapping with
L101~104 ELQS181KB Choke, Input
(EGA) only Detent, ®3x8 (3)
SBD69—1 Knob (3) N5(Except(XA, |XTB3+8BFN Tapping, ®3x8 (1)
L301, 302 SLQY07G—30 Choke, Output
SHR9673 Holder, (3) PC)) ©
L601 A\ |SLQZ650MH49 Choke, AC Line
SGXUZ55—SE1 Ornament, Volume N6 ©|XTB4+10BFN |Tapping, @4x10(4)
(EGA) only (Silver type) (1) © |XTB3+16BFN |Tapping, @3 x16(2)
TRANSFORMER SGXUZ55— KE1 Ornament, Volume © |XTB3+8BFN Tapping, @3x8 (7)
(Black type) (1) XTBS3+8BFZ1 {Tapping with
T1 A Power Source
(XA, PCJonly Detent, ®3x8 (1d
SHR9675 Holder, Volume
T1 A Power Source Knob
(EK, XLonly SBD83
Ti(other) A Power Source SHR9629 Holder, Input
Selector Button (3) N11(XA, PC) Spring, 43
$DU203 Filter, FL only
SHR9677 Holder, FL N12 Plain, ¢3 (7)
Fl A |XBA2C10TRO T1A, 250V
$JJ63B External Tooted
F2 A |XBA2C20TRO T2A, 250V
suw2115 Lock, 43
(XA, PC)only
SHR401—1
VARIABLE RESISTORS SJT347 Holder, Fuse
SMK59 Bracket Plug Adaptor (1
EWFO0105A15S Volume, 100k9(A)
EWANA7X05G15 |Balance, 100k0(G)
EWANA6XO05A15 |Tone, 100k9(A) 24(XA, PC) SMX801 Insulation Cover (1) Plug Adaptor (1)
only
EWANA8X05240 |FL Tone Switch
24 (other) SMX779 Insulation Cover (1) Instruction Book (1)
THERMISTERS Instruction Book (1)
25(XLJonly SHR131 Bushing, AC Cord Instruction Book (1)
TH201, 202 RRT104 iowa (1) Instruction Book (1)
COMPONENT COMBINATION 25(EK)only SHR129 Bushing, AC Cord Instruction Book (1)
(1) Instruction Book (1)
}za01 | SxRFS203zSM__[0.01(x2) 25 (other) SHR127 Bushing, AC Cord Instruction Book (1)
(1)
FLUORESCENT DISPLAY TUBE
26(XA, PC) SJA111 (1)
only A Polyethylene Bag
SWITCHES 26(XL) only QFC1207MA (1) (1)
Input Select
26(EKJonly QFC1205M Polyethylene Bag
Tape Monitor
Loudness
A (1)
Speaker
A SJA165 Polyethylene Bag
(1)
SJF4815—2 Terminal Board
A |ESB90227S Power Source
(XA, PC)only
SJF3059N
SS5(other) AV |SSH1071 Power Source
SGP3791A
S6(XAJonly A\ |ESE37219 Voltage Select
29(EGA) SGP3791B
29(EK) SGP3791C P6(EFJonly Carton Box
29(XA, PC) SGP3791—1A P6 (other) Carton Box
29(XL) SGP3791—2A
29(EF, EH, EB, |SGPUZ55—SE P7 Label(Black type
Ei) only)
 SU-Z55 SU-Z55
lM EXPLODED VIEW

all areas.

. SU—Z55(K) |

Socket, AC Outlet
w SSSEES_
SSE
SS

Foot
Terminal
Shield Plate (1)

Tapping, ®3x8 (3)

Tapping (Silver) (2)
Tapping (Black) (2)

3x6 (4)

Tapping with
Detent, 3x8 (3)
Tapping, @3x8 (1)
Tapping, B4 x 104)
Tapping, ©3 x 16(2)
Tapping, 3x8 (7)
Tapping with

Plug Adaptor (1)

Plug Adaptor (1)

Instruction Book (1)

Pad, Left Side (1)

Pad, Right Side (1)
Pad, Upper (1)

Carton Box

Label(Black type
only) (2)

Printed in Japan
830610500 @KS/TN®D
 ORDER NO. SD83062525C8-—A

Stereo Integrated DC Amplifier S(J-~Z7 5 5/SU-2755(k) x

O
”n
fu
a)
ud
@ This booklet contains the specifications for SU-Z55, written Germany, French and Spanish, and the circuits to be [a)
changed according to areas.
@ File this manual together with the SU-Z55 service manual (Order No. SD83062525C8).

@ Das vorliegende Biichlein enthalt die Spezifikationen fiir SU-Z55 in deutscher, franzésischer und spanischer Sprache.
® Bewahren Sie das Biichlein zusammen mit der Bedienungsanleitung fiir SU-Z55 (Bestell-Nr. SD83062525C8) auf.

® Cette brochure contient les spécifications pour le SU-Z55, écrites en allemand, en frangais et en espagnol.
© Classer ce manuel en méme temps qu’avec le manuel de service du SU-Z55 (N° d’‘ordre : SD83062525C8).

e@ Este librito contiene la especificaciones para SU-Z55, escritos en aleman, francés y espariol.
© Guardar este manual juntamente con el manual de servicio de SU-Z55 (Pedido N°. SD83062525C8).

DEUTSCH
| TECHNISCHE DATEN (Spezifikationen Konnen infolge von Verbesserungen ohne Ankundigung geandert werden.}

(DIN 45 500) Gerduschabstand

@ VERSTARKERTEIL Nennleistung (4 Q)
Phono 75 dB (nach IHF, A: 81 dB)
Dauerton-Ausgangsleistung bei 40 Hz ~ 20 kHz TUNER, AUX/CD/VIDEO, TAPE 1, 2
beide Kanale ausgesteuert 2 X 45W (4Q) 86 dB (nach IHF, A: 97 dB)
2 X 40W (8 9) —26 dB Leistung (4 9)
Dauerton-Ausgangsleistung bei 1 kHz Phono 65 dB
beide Kanale ausgesteuert 2 X 50W (49) TUNER, AUX/CD/VIDEO, TAPE 1, 2 65 dB
2 X 42W (8 Q) 50 mW Leistung (4 9)
Gesamtklirrfaktor Phono 62 dB
Nennleistung bei 40 Hz ~ 20 kHz 0,05% (4 Q) TUNER, AUX/CD/VIDEO, TAPE 1, 2 62 dB
0,03% (8 Q) Klangregler
Nennleistung bei 1 kHz 0,05% (4 ) BaBregler (BASS) 50 Hz, +10 dB ~ —10 dB
0,03% (8 Q) Hdhenregiler (TREBLE) 20 kHz, +10 dB ~ —10 dB
halbe Nennleistung bei 40 Hz ~ 20 kHz 0,05% (4 Q) GehéGrrichtige Lautstarkekorrektur (Loudness)
0,03% (8 ) (bei —30 dB Ausgangsleistung) 50 Hz, +9 dB
halbe Nennleistung bei 1 kHz 0,007% (4 Q) Ausgangsspannung und -impedanz
0,005% (8 ) Aufnahmeausgang (REC OUT) 150 mV
—26 dB Leistung bei 1 kHz 0,01% (4 Q) Kanalabweichung (AUX/CD/VIDEO, 250 Hz ~ 6300 Hz)
50 mW Leistung bei 1 kHz 0,01% (4 9) +1 dB
Intermodulationsfaktor Ubersprechdamptung (AUX/CD/VIDEO, 1 kHz) 50 dB
Nennleistung bei 250 Hz: 8 kHz = 4:1, 4 Q 0,05% Kopthiérerpegel und -impedanz 420 mV/330 Q
Nennleistung bei 60 Hz: 7 kHz = 4:1, nach SMPTE, 8 © Lautsprecherimpedanz
0,03% MAIN oder REMOTE 8BQ~ 160
Leistungsbandbreite MAIN und REMOTE 4N~ 169
beide Kandle ausgesteuert bei —3 dB
10 Hz ~ 25 kHz (49) @ ALLGEMEINE DATEN
10 Hz ~ 25 kHz (8 Q)
Restbrumm und Gerausch 0,8 mV Leistungsaufnahme 310 W
Dampfungsfaktor 20 (4 3, 40 (8) Netzspannung
Eingangsempfindlichkeit und -impedanz Fir Kontinentaleuropa Wechselstrom 50 Hz/60 Hz, 220V
Phono 2,5 mV/47 kQ Fir andere Lander Wechselstrom 50 Hz/60 Hz,
TUNER, AUX/CD/VIDEO, TAPE 1, 2 150 mV/22 kQ 110V/120V/220V/240V
Maximale TA-Eingangsspannung (1 kHz, eff.) 150 mV Abmessungen (BXHXT) 430 X 86 X 240 mm
Frequenzgang Gewicht 5,1kg
Phono RIAA-Standardkurve
+0,8 dB (30 Hz ~ 15 kHz) Bemerkung: F
TUNER, AUX/CD/VIDEO, TAPE 1, 2 Der Gesamtklirrfaktor wurde mit einem digitalen Rausch-
10 Hz ~ 80 kH2 (-3 dB) spektrometer (Anlage H.P. 3045) gemessen.
FRANCAIS

FRANCAIS
li CARACTERISTIQUES (Sujet a changement sans prearis.)

(DIN 45 500)
@ SECTION AMPLIFICATEUR Signal/Bruit
a puissance nominale (4Q)
Puissance de sortie continue de 40 Hz~20 kHz,
PHONO 75 dB (IHF, A: 81 dB)
les deux canaux en circuit 2 X 45W (4) SYNTONISATEUR, AUX/CD/VIDEO, BANDE 1,2
2 X 40W (80) (TUNER, AUX/CD/VIDEO, TAPE 1, 2)
Puissance de sortie continue a 1 kHz
86 dB (IHF, A: 97 dB)
les deux canaux en circuit 2 X 50W (4) puissance de —26 dB (4Q)
2 X 42W (89) PHONO
Distorsion harmonique totale 65 dB
SYNTONISATEUR, AUX/CD/VIDEO, BANDE 1,2
4 puissance nominale (40 Hz~20 kHz) 0,05% (42) (TUNER, AUX/CD/VIDEO, TAPE 1, 2) 65 dB
0,03% (82) puissance de 50 mW (49)
a puissance nominale (1 kHz) 0,05% (4) PHONO 62 dB
0,03% (8) SYNTONISATEUR, AUX/CD/VIDEO, BANDE 1,2
4 demi-puissance (40 Hz~20 kHz) 0,05% (40) (TUNER, AUX/CD/VIDEO, TAPE 1, 2) 62 dB
0,03% (82) Tension de sortie et impédance
a demi-puissance (1 kHz) 0,007% (49) SORTIE ENREGISTREMENT (REC OUT) 150 mV
0,005% (89) Equilibrage des canaux, AUX/CD/VIDEO 250 Hz~6 300 Hz
puissance de —26 dB a 1 kHz 0,01% (4) +1 dB
puissance de 50 mW a 1 kHz 0,01% (42) Séparation des canaux, AUX/CD/VIDEO 1 kHz
50 dB
Distorsion d’intermodulation Niveau de sortie des casques et impédance
4 puissance nominale a 250 Hz: 8 kHz=4:1, 40 420 mV/3300
0,05% impédance de charge
a puissance nominale a 60 Hz: 7 kHz=4:1, SMPTE, 80 PRINCIPALE ou AUXILIAIRE (MAIN or REMOTE)
0,03%
Réponse de fréquences 8N~16Q
PRINCIPALE et AUXILIAIRE (MAIN and REMOTE)
les deux canaux en circuit, —3 dB 10 Hz~25 kHz (4)
4N~16Q
10 Hz~25 kHz (80)
Bruit et ronflement résiduels 0,8 mV @ DIVERS
Coefficient d’amortissement 20 (4Q), 40 (8Q)
Sensibilité et impédance d’entrée Consommation
PHONO
310W
2,5 mV/47kQ Alimentation
SYNTONISATEUR, AUX/CD/VIDEO, BANDE 1, 2 Pour l'Europe CA 50 Hz/60 Hz, 220V
(TUNER, AUX/CD/VIDEO, TAPE 1, 2) 150 mV/22kQ Autres CA 50 Hz/60 Hz, 110V/120V/220V/240V
PHONO (tension d’entrée maximum, 1 kHz RMS) 150 mV Dimensions (LXHXPr) 430 X 86 X 240 mm
Réponse de fréquence Poids 5,1 kg
PHONO Courbe nominale RIAA
+0,8 dB (30 Hz~15 kHz) Nota:
SYNTONISATEUR, AUX/CD/VIDEO, BANDE 1,2 La Société NATIONAL-PANASONIC-FRANCE, importa
teur du
(TUNER, AUX/CD/VIDEO, TAPE 1, 2) matériel MATSUSHITA-ELECTRIC déclare que cet
appareil est
10 Hz~80 kHz (—3 dB) conforme aux prescriptions de la directive 76/889/
C.E.E. (arrété
Réglage de Ia tenalité 14 Janvier 1980),
BASSES (BASS) 50 Hz, +10 dB~ -10 dB
AIGUS (TREBLE) 20 kHz, +10 dB~ -10 dB Remarque:
Compensateur physiologique (volume a —30 dB) On mesure la distorsion harmonique totale au
moyen d’un
50 Hz, +9 dB analyseur de spectre digital (Systeme H.P. 3045).
 ESPANOL

i CIRCUITS TO BE CHANGED AND THE AREAS

ESPANOL e Power source circuit

[XA] area
ii ESPECI FICACIONES (Estas especificaciones estan sujetas a cualquier cambio sin previo eviso.)

(DIN 45 500)
MH SECCION AMPLIFICADOR Relacion de sefial a ruido
potencia de régimen (4Q)
Potencia continua de 40 Hz~20 kHz
en ambos canales 2 X 45W (4Q)
2 X 40W (8Q)
TOCADISC. (PHONO) 75 dB (IHF, A: 81 dB)
SINTON., AUX./CD/VIDEO, GRAB. 1, 2
(TUNER, AUX/CD/VIDEO, TAPE 1, 2) A\
7 A
SWITCHED
Potencia continua de 1 kHz 86 dB (IHF, A: 97 dB) AC 1!10/120/
220/240V

en ambos canales 2 X 50W (40) —26 dB de potencia (49) (50/60 Hz)

2 X 42W (8Q) TOCADISC. (PHONO) 65 dB

Distorsion armonica total SINTON., AUX./CD/VIDEO, GRAB. 1, 2
potencia de regimen a 40 Hz~20 kHz 0,05% (40) (TUNER, AUX/CD/VIDEO, TAPE 1, 2) 65 dB
0,03% (8Q) 50 mW de potencia (49)
potencia de régimen a 1 kHz 0,05% (40) TOCADISC. (PHONO) 62 dB
0,03% (80) SINTON., AUX./CD/VIDEO, GRAB. 1, 2
(TUNER, AUX/CD/VIDEO, TAPE 1, 2) 62 dB
[XA] is available in Southeast Asia, Oceania, Africa, Middle Near East and Central South America.
mitad de potencia a 40 Hz~20 kHz 0,05% (4Q)
0,03% (8Q) Controles de tono
mitad de potencia a 1 kHz 0,007% (4) BAJOS (BASS) 50 Hz, +10 dB~ —10 dB
0,005% (8Q) AGUDOS (TREBLE) 20 kHz, +10 dB~ —10 dB
—26 dB de potencia a 1 kHz 0,01% (49) Control de sonoridad (volumen a —30 dB) 50 Hz, +9 dB
50 mW de potencia a 1 kHz 0,01% (4Q) Voltaje e impedancia de salida
Distorsién por intermodulacion SAL. GRAB. (REC OUT) 150 mV [EF] area [EGA] area [XL] area
Equilibrio de canales, AUX/CD/VIDEO 250 Hz~6 300 Hz - a ee
potencia de régimen a 250 Hz: 8 kHz=4:1, 4Q 0,05%
potencia de régimen a 60 Hz: 7 kHz=4:1, SMPTE, 80 +1 dB
0,03% Separacion de canales, AUX/CD/VIDEO 1 kHz 50 dB
Additional | Additional | | I
Ancho de banda de potencia Impedancia y nivel de salida de los auriculares 420 mV/330Q part part

con ambos canales, —3 dB 10 Hz~25 kHz (49) Impedancia de carga (14)BRN

10 Hz~25 kHz (89) MAIN o REMOTE 8Q~16Q
MAIN y REMOTE 4N~160
I
Zumbido residual y ruido 0,8 mV
Factor de amortiguamiento 20 (4), 40 (80) @ GENERAL
Sensibilidad e impedancia de entrada Consumo de energia 310W
TOCADISC. (PHONO) 2,5 mV/47kQ Alimentacion de energia
SINTON., AUX./CD/VIDEO, GRAB. 1, 2 Para Europa continental CA 50 Hz/60 Hz, 220V AC 220V |
Aceo3
0.047 AC 220V
SOHz (50Hz) | | ae aone
(TUNER, AUX/CD/VIDEO, TAPE 1, 2) 150 mV/22kQ Para otros paises CA 50 H2/60 Hz, 110V/120V/220V/240V |

“TLL
Voltaje maximo de entrada de PHONO (1 kHz, RMS) 150 mV Dimensiones (An.XAlI.XProf.) 430 X 86 X 240 mm
Respuesta de frecuencia Peso 5,1 kg
TOCADISC. (PHONO) curva RIAA estandar Nota:
+0,8 dB (30 Hz~15 kHz) La distorsidn armdnica total se mide con el analizador de
SINTON., AUX./CD/VIDEO, GRAB. 1, 2 espectro digital (sistema H.P. 3045).
(TUNER, AUX/CD/VIDEO, TAPE 1, 2)
10 Hz~80 kHz (—3 dB)
[EF] is available in France.
[EGA] is available in F. R. Germany.
[XL] is available in Australia.

[Continental Europe]

AC 220V
Ht |
 e Input/output terminal circuit
[EGA] area

; ]
; Additional parts :
| RIOl~ 2 |
’ clo1~m iio ‘
| LIOIl~ 104 |

e Speaker terminal circuit

— area.
a.[EGA] |isavailable in F. R. Germany.
WO
ie reAAG eRaL
(L ch) C103 100P
ees
Lt @ sariel

TUNER C eeerema sacs co

ba C325 ~ 328
J
RI0S 22

()
seis GU RIO7 2.2K

2)
|

pREC OUT o- Clo7r ©

TAPE | Ta99 (©)
UpLavBaKO ©)
MS L | |
rREC oUTO—a5
TAPE 2/EXT
¢
h
@
PLAYBACK(O
@) MAIN |

a
SPEAKERS |

al
(R ch) fal
RIO6
TUNER 61H
cloé

cD/Aux © 1 REMOTE
/VIDEO mee
pREc OUT ical
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Rirted in Japan
89609100 () KS
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 ORDER NO.. §08307259288 2
:

Service Manual Stereo Integrated Amplifier

SU-Z55
[E], [EGA], [EK], [EF], [EH],
[EB], [Ei], [XA], [XL], [PC]

SU-Z55\(k)
[E], [EGA], [EK], [EH],
[EB], [XA], [PC]

Please use this manual together with the service manual for Model No. SU-Z55, Order No. SD83062525C8

CORRECTION
. The product name was wrong.
. The correct voltage of 1C1, 1C501 and 1C502 refers to the page 2.
. The positive (+B) voltage linesand negative (—B) voltage lines of schematic diagram was wrong.
. The correct part of parts list refer to the page 2.
. We will send the schematic diagram on which the correct voltage is shown.
. The correct parts of power amplifier protection refer to the supplement last page.
WN
oof

i h od Matsushita Electric Trading ©o., Ltd.

ec hics PO. Box 288, Central Osaka Japan
1. The product name is the correction.

Stereo Integrated Amplifier Stereo Integrated Amplifier

correction

2. The correct voltage values in the schematic diagram.

1C1
SVINJM2043DD Voltage Voltage
1 OV 5 OV OV OV
2 ov 6 OV EQUALIZER ov au
3 OV 7 ov OV OV
correction

Voltage Voltage 1C501, 502 Pin Voltage Voltage

—0.1V SVIBA6148 1 ov 9 -0.1V
—0.1V Rch, Lech FL DRIVER zeae Wis) A eS
(COMPARATOR) 3 }__-0.1V— 11 —0.1V
4 —0.1V 12, | —0.1V
aap 5 —0.1V 13 —0.1V
y [-*
correction 6 “OV | 44

7 —O.1V |45.
8 [ —o.1v 16

3. The positive (+B) voltage lines and negative (—B) voltage lines change the parts.

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Part Name & Description | Pes/Set Remarks

Wrong _] Correction

=>
Transparent Cover
SGUUZ55—E SGUUZ55—SE

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 10

FL Level Meter
GND fa~i2a Lch. level segment
IBxI2bD Reh. level segment
POWER AMPLIFIER, MUTING AND POWER SUPPLY
1301 D301, 302 Q301, 302 1€302
AN7062 MAI62A 2SA992 SVISTK2038B
VOLTAGE AMP DRIVER 2ch POWER AMP
PHONO

' 58 Voltage Amplifie ro :

ic501 I.

| MIRE ORIVER
Cc
EQUALIZER (COMPARATOR }

R305 c301 beh

: e. et Ah Pe
] Bey x

INPUT/OUTPUT TERMINAL i ‘

}
Left Channel Phono Signal
a ged) &
8, 10502
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a SVIBAGI48 rf Sie = 2
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im
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‘\ T 401 9402, 403 Power Supply
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Bar Switch’ Treble’
 SU-2Z55
10 11
@ SCHEMATIC DIAGRAM
(This schematic diagram may be modified at any time with the
development of new technology.)

FL Level Meter

POWER AMPLIFIER, MUTING AND POWER SUPPLY LE spencer TERMINAL

ic301 D301, 302 0301, 302 e302
AN7062 MAI62A 2SA992 SV1STK2038B
VOLTAGE AMP DRIVER 2ch POWER AMP L \\
i \
NF Line MAIN
a Seal
2 ayers
:
Sa3 Voltage Amplifie
=g C3 SP
ey Power Amplifier SPEAKERS
ie cibenoende tag seth aden” asec 92K)
1C501 ; D30r ES SmS care L
SVIBA6I48 14:
@m) S0V4,7
Loh FL DRIVER 6303 q ae Fer | ae
(COMPARATOR ) 5 aeS R
R308 C301 Sha |oS
v9 IkAap petipeiaguisga
3 ia: 8 os
rs gs
2
a33% ( CH ais oT
om Zi ) ee sts 3 3 *The part No. of transistors, IC and diodes mentioned in the schematic
: Om Ore sfé 65) B52] GED ET) B77 Gag o diagram stand for production part No. Regarding the part No. with
6 inact g e]o e301 only oO mark, the production part No. are different from the replacement
:: =
ome E a ae part No, Therefore, when placing an order for replacement part, please
Is 36.3] (35.2 [565] BF) BFA Bea) sl use the part No. in the repiacement parts list.
: (s} 6) Pe @—-O—-O—-O—_O—-O—- oT
f .
Notes:
Ap322 eet : 4 ls
; _ eal 1. This is basic circuit diagram (For continental Europe} of this unit.
a E
2. Regarding the circuits to be changed in the basic circuit diagram (For
é '
continental Europe) and related areas ({EGA], [XL], [XA]) and [PC]

somes 2 fe A).
refer to the booklet contain manual (Order No. SD83062525C8-—
Roch FL DRIVER : § 3. $1-1 ~ $1-3 : Input selector switch in “phono” position.
(COMPARATOR :
: . ; S + {( S1-1 : phono, $1—2 : tuner, $1—3 : Aux/
E : &
: a CD/Video)
: ai 4. $2-1 ~S2-2 Tape-monitor selector switch in ‘‘source’’
Re 3 Nien Position.
. 2 — f : + .
10V (Segment Light up)® | E (S2-1 : tape 1, S2—2 : tape 2}
_04V SI E 5. $3 Loudness switch in ‘off’ position,
. a : i 6. S4-1 ~ S4—2 Speaker switch (main) in ‘‘on" position.
of E Speaker switch (remote) in ‘‘off'’ position.
ae FL Bal 3 : : (S4—1 : main speaker, S4—2 : remote spe-
S¥BakY SEVER B Suaiee ee a S| C414 For(EGAlonly aker).
neoe aoe ee ar Switch Lifes 4 3 : Muting \ E 7. SB Power source switch in “‘on’’ position.
SYDSHV EGY CR op \ — a E E 1c40l \ E 8. S6 ([XA] and [PC] area Voltage selector switch in “240V" position,
(23) \ { aii MUTING 8PROTECTION \ @?) E only) (Refer to booklet contain)
+ ++ : :7
FL LEVEL METER \ q
I
E
[
2401 o4oz, ao3_ |Power Supply \
9) ie
:
: 9,
Find Indicated voltage
120V <—» 110V «> 220V<—» 240V
values dre the standard values for the DC
TONE CONTROL \
\ I SWITCHING FPREGULATOR RO Re 4 4 electronic circuit tester (high impedance) with the ground point taken
5 't, JOVER LOAD DET IMUT ING! eeplols eeD SF ANC G2)@') 4) 3) 2s) (5)

\ E E 9) . as standard. Therefore, there may exist some errors in the voltage volues,
\ "pais
| ceos Tt : E 3 \ & depending on the internal impedance of the DC circuit tester.
= ms r : j [ ae i g $4 oll - 10. Important safety notice:
VOLUME CONTROL ; ti ae a 3 § + 2 $ g ¢ 3 Components identified by A mark have special characteristics important
f «J . a =
Bie i oike es, A ; : * s 3g for safety. When replacing any of these components, use only manufacture-
) — a | 8 a2 | i i = i ee eo ee ee eee r’s specified parts.
ade ° ; . E <] 11. “ Phono signal lines of left channel.
2 i \ £ 0 : : :
i \ | Lo Poet | |: [ 6) 12, NF Signal lines of teft channel.
? -2 ms E t
; \ ‘ eT | a ila f I 63) 13, —=eP> Positive (+B) voltage line.
\ = |
Fes cae 2 i Sf i 14, =—— <> Negative (—B) voltage fine.
& : { {
ome - « —- j t
(3) sy le t
a
Sec -
oe q
& : oe [3 E n3zq HEADPHONES
ny D401 D402 0403, 404 0405 ~ 408
S: by § é : Mee.
E © maiso SVDMZ312C SVOMZ 316 svps2v20
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; Ome SPEAKER & Ass &

ome SWITCH oo
ri
cme C60I 0.0%

. © nas© CE a
| we vient FL Tone | Bass as i i = - ae
Bar Switch: Treble sas _ genes 150/60Hz
i aia = = 32 = _ =
 6. The correct parts of power amplifier protection.

@ POWER AMPLIFIER PROTECTION

Seas.
cetgs
oli © Short-circuit of speaker terminals
1. If speaker terminals are short-circuited, a high level current
will flow to power amplifiers Q5 and Q6, causing
the voltage across emitter resistor R5 to increase.
Voltage across R5 causes overload detecting transistor Q7 to turn ON.
. Emitter voltage of Q7 (ground potential) goes to terminal (7) of
1C302 through R8.
. Voltage at terminal (7) is transmitted to terminal (5) of muting IC (1C401).
Calculation circuit of 1C401 operates to eliminate the voltage at terminal (3) of
1C401.
OnrRwhr
. On operation of muting circuit of 1C301, the drive circuit of 1C302 stops
operating and the current from power
amplifier also stops.
Note: 1. Terminal (3) of 1C401 supplies power to drive circuit of power amplifei
r 1C302, and supplies control
voltage to muting circuit of voltage amplifier |C301.
2. 1C401 is provided with muting function to prevent shock noise during
power ON/OFF in addition
to power amplifier protection.
1C 302
SVISTK2038B
Power amplifier

iC 301
AN7062
VOLTAGE AMP

eae
sangeet
men:
Time
6 constant

Right channel

From power !
transformer

| I
\ Ic 40] i |
AN7072N be|
Mute & protection circuit
|

4A
;
j

Printed in Japan

830610000 (N) KS