Similar models: P5 (mechanically the

same). Super Program and A3000

(electronically similar)
Product #: P30 (domestic version) —
PENTAX P3, P30
25300; P3 (American version) —
25301
Batteries: 2ea S76 (negative ground)
APERTURE-
Fig. I —top cover removed A VOLTAGE B
TP DEPTH-OF-FIELD
PREVIEW LEVER
Fig. 2 bottom cover removed, wind
LEFT-
lever held partially advanced CRYSTAL
HAND
sws
Fig. 3—top view, wind side
Fig. 4 -front view, mirror box
removed
Fig. 5-—mirror box. bottom view
Fig. 6 underside of PC board T100
(Ilex)
Fig. 7—top view of wind side, mirror
box removed MAIN SWITCH SHUTTER-
SPEED
Fig. 8—bottom view of wind side, PC BOARD
c
ratchet wheel removed
Fig. 9—top view of wind side, wind- FIGURE 1

ing seal removed

Fig. 10 top view of wind side, wind A/M CONTACT MECHANICAL
shaft removed WIND-COMPLETION RELEASE
SWITCH D
Fig. 11 — underside of top mechanism
plate — reassembly position
of pawl
Fig. 12—top view of wind side, top
mechanism plate removed
Fig. 13—sprocket-hook timing
Fig. 14—sprocket timing
Fig. 15—counter-gear timing
Fig. 16 — test points, underside of PC
board T100 (flex) RATCHET SHUTTER- WINDING-GUIDE
WHEEL CHARGE E PLATE ASSEMBLY
0-C106 LEVER 0-C102
Fig. 17—lest points, main-switch
TRANSPORT
block LATCH 0-C108
FIGURE 2
Fig. 18—test points, LED block
Fig. 19—wiring variations, early style apply conductive paint between the
Not shown:
PC board T100 timing-switch adjustment and the
Aperture-value resistor. Variable resis-
Fig. 20—test circuit for optical tor at back of front plate, wind side shutter mechanism plate to improve
encoder top (near mirror box). the ground.
Fig. 21 —wiring pictorial and test Mirror angle. Hex nut on wind side of
points mirror box, under mirror (reach ADJUSTMENT VALUES:
through lens opening).
ADJUSTMENT LOCATIONS: •There are four adjustment points for Curtain-travel time: 6.05 ± 0.3ms
the height and level of the focusing (21mm distance), 5.76ms (20mm
Aperture-control voltage A distance)
Auto exposure screen. To reach the two adjustments
B
Focusing screen at the front, remove PC board T100 Flange-focal distance: 45.46 ±
C*
Wind-completion switch (flex). However, if the focus at the 0.04mm (flange to film rails)
D
Sprocket hook E focusing screen is incorrect, you can Aperture-control voltage: 500 ±
Travel time. 2nd curtain F make minor adjustments on the mir- l00mv P-P
Travel time, 1st curtain G ror angle. Use a 2.5mm hex key to Battery check: 2.45V — LEDs normal
Timing switch (fast speeds) H** turn the hex nut. 2.35V — LEDs pulse
Shutter release I **lf you adjust the timing switch. on and off
 Resistance, aperture-value resistor:
5.9K ± 10 ohms at f/8
Release point. 1st curtain: The 1st cur-
LED FLEX
tain should release when the mirror is CONNECTOR
I - 3mm from the porous-plastic strip
at the top front of the mirror box.
Timing, sprocket hook: The clearance
between the edge of the mirror-charge
lever and the sprocket hook should be
0 - 0.2mm with the wind lever held
fully advanced. Fig. I 3.
Wind-completion switch, space gap: sws
0.2 - 0.4mm
Release magnet: The space gap SWH
between the release-magnet armature
and the release lever should be 0.1 -
0.3mm, Fig. 5. Adjust by shifting the
release magnet.
Counter gear: When the counter-
actuator lever is parallel to the ends of HOT-SHOE
the camera body, the pie-shaped open- CONTACT APERTURE RELEASE GROUND
FIGURE 3 PIECES CAPACITOR CAPACITOR
ing in the counter gear should face the
rewind end of the body. Fig. 15.
Sprocket: Turn the sprocket toward
the film aperture to take up the back-
lash. The sprocket should then be
within the range shown in Fig. 14 —
one pair of teeth pointing directly to
the back of the camera or within 30
degrees toward the take-up spool side.

ADJUSTMENT PROCEDURES
1. Aperture-control voltage
a. Connect a hook-up wire to the
aperture-voltage TP, Fig. 1.
b. Connect an oscilloscope
between the hook-up wire and
ground.
c. Set the lens to "A."
d. Set the scope to 2ms sweep
time. 20mv vertical deflection. FIGURE 4
10:1 on the probe.
e. Release the shutter while
observing the diaphragm opening.
Make sure the diaphragm stops tion sould be f/4 and 1/250. of the aperture-value resistor from
down smaller than f/2.8. If not, c. Adjust B , Fig. 1, for 0 EV the flex PC board T100, Fig. 21.
increase the light level to get a error or for a shutter speed of Connect an ohmmeter between
smaller aperture. 3.9ms. Tolerance — 3.5 - 4.3ms. the two wires.
f. Release the shutter while Turn the wiper counterclockwise b. Set the lens to f/8. The resist-
observing the scope trace. Note for a longer exposure, clockwise ance should be 5.9K + 10 ohms.
the peak-to-peak value of the sine for a shorter exposure. c. To adjust, remove the front-
wave Adjust A, d. Check at EV8. The plate/mirror-box assembly. Then
Fig. I. for a value of 500 ± aperture/shutter-speed combina- adjust the variable resistor at the
lOOmv (turn the wiper clockwise tion should be 1/60 at f/2. wind side of the front plate.
for a higher voltage). Shutter-speed tolerance — 12.2 4. Shutter (1st curtain) release
-19.9ms. a. Hold the bottom edge of the
e. Check at EV16. EVI0, and mirror and push the release
Exposure EV6. The exposure should be button. Or, if power isn't being
a. Set the program mode (lens at within ± 1.0EV at each light level. supplied to the circuit, mechani-
"A," shutter speed at any setting). cally release the mirror through
b. Check at EV12 (ISO 100). The 3. Aperture-value (f-value) resistor the cutout shown in Fig. 2 (push
aperture/shutter-speed combina- a. Unsolder the two yellow wires the armature of the release
 magnet toward the front of the
camera).
b. Allow the mirror to move up
slowly and note the mirror posi-
tion when the shutter releases.
The distance between the mirror I
and the porous-plastic light trap
at the top of the mirror box
should be 1 - 3mm. MIRROR-
CHARGE
c. If the distance isn't correct. LEVER
remove the mirror box and bend
the long arm of the shutter-release
lever. Bend up the arm to make
the shutter release sooner (dis-
tance between the mirror and the
light trap too small). Bend down
the arm to make the shutter
release later.

RELEASE RELEASE
OPERATING INSTRUCTIONS MAGNET LEVER
S100
1. Push forward the main-switch FIGURE 5

knob (top, rewind end) to operate

camera. In the on position, the
main-switch knob uncovers " I "
on a red background. With the IC2
LEO DRIVER
main switch in the off position, IC1
the shutter won't release and the CPU
LEDs won't turn on.
2. The finder LEDs turn on when
you push the release button part
way. The LEDs remain on 10
seconds after you let up the
release button or after the
exposure.
3. For program operation, set the
lens to "A" (auto). The setting of
the speed knob makes no differ-
ence. With the lens at auto, the
"P" (program) LED turns on at
the top of the display when you
push the release button part way.
The LED display also shows the FIGURE 6
shutter speed that will be auto-
matically delivered. If the light
conditions require a shutter speed
faster than 1/1000. the "1000" on. At the flash-speed setting won't operate (no action when
LED flickers. If the light condi- (I /100). only the "M" LED turns you depress the release button).
tions require a shutter speed on. 7. The DX coding on the film car-
slower than 1 second, the M" For self-timer operation, hold tridge automatically sets the film
LED flickers. down the button to the front of speed. There's no manual film-
4. For metered manual operation, the main-switch knob. Then push speed control. With no film — or
set the lens to a manual f/stop. the main-switch knob fully for- with an uncoded cartridge — the
The setting of the speed knob ward. The main-switch knob now film-speed setting is ISO 100.
now determines the shutter speed. uncovers "S.T." on a red back- 8. The depth-of-field preview lever
A red "M" turns on at the top of ground. When you depress the is at the front of the camera,
the LED display to indicate man- release button, the self-timer release-button side. Fig. 1.
ual mode. The shutter-speed LED delays the mirror release for 12 9. The "ML" (memory-lock) button
that glows steadily indicates the seconds. The self LED (front, (front, rewind side of lens mount)
setting you've selected. The flick- release-button side) flickers dur- provides the auto-exposure lock
ering LED indicates the speed ing the delay. The frequency of on program mode. In the first
you should select for proper the LED oscillator increases just version of the circuit, you must
exposure. before the release. If the shutter is keep the memory-lock button
5. At the bulb setting (manual set to bulb and the lens is set to a depressed to lock the exposure. In
f/stop), none of the LEDs turn manual f/stop, the self-timer the revised circuit, you don't have
 to hold in the memory-lock but-
ton. Depressing the memory-lock
button turns on the LEDs and
locks the exposure for 10 seconds.
During the memory hold, the "P" SHUTTER-SPEED WINDING COUNTER-
BASE PLATE SEAT DIAL
LED and the shutter-speed LED 0-C2 RETAINER
flicker. On manual mode, the NUT
memory-lock button has no func-
tion. If you depress the memory-
lock button on manual mode, the
"M" LED and the shutter-speed
LED flicker. However, the opera-
tion isn't affected.
10. The current version of the camera
has a cable-release socket at the
front, rewind side of the lens
mount. Shorting across the cable-
release socket releases the mirror.
11. The finder LEDs provide the low-
battery warning. If the LEDs
flash on and off, the batteries are
getting low. If the batteries are
too low for proper operation, the
LEDs won't turn on and the shut-
FIGURE 7
ter won't release.
12. The camera provides automatic
flash control with any Pentax
dedicated unit. In the manual TRANSPORT-
LATCH SPRING
mode, the flash sets the shutter
speed to 1/100 if the shutter is set
to 1 /125 or faster. When the
flash charges, a lightning-flash
LED turns on in the finder along
with "M." The shutter-speed
LEDs turn out. If you set the R LEVER
shutter to 1 /60 or slower, the C105
shutter delivers the selected shut-
ter speed. The lightning-flash
LED, the "M" LED. and the
shutter-speed LED noting the set-
ting turn on when the flash
charges. In the program mode,
the flash sets both the shutter
speed and the aperture. When the RETURN
flash charges, the "M" LED and SPRING
the lightning-flash LED turn on. C137 SPROCKET HOOK
The shutter delivers 1/100.
FIGURE 8S

SWITCH LOCATIONS AND

FUNCTIONS
mirror-release signal for 12 Timing switch. In shutter block,
1. Main switch. Sliding switch, lop seconds. Fig. 21. The timing switch is
rewind end. Fig. I. In the on posi- SWS. Light-measuring switch. closed with the shutter cocked,
tion. Fig. 17, the main switch Top contact on shutter-speed PC enabling the release. When the
connects battery voltage to PC board, tig. I. Pushing the release 1st curtain starts to run. the
board TI00. With the main button part way moves the SWS timing switch opens to start the
switch in the off position, the contact against the center ground timing cycle.
shutter won't release and the contact. The LEDs turn on. Wind-completion switch. Bottom
LEDs won't turn on. 4. SWR. Release switch. Bottom of camera, wind side. Fig. 2.
2. Self-timer switch. On main- contact on shutter-speed PC During the cocking cycle, the
switch block. Fig. I 7. Sliding the board. Fig. I. Fully depressing the wind-completion switch closes to
main switch all the way forward release button moves the center inhibit the shutter release. The
connects battery power to the ground contact against the wind-completion switch opens
circuit and closes the self-timer release-switch contact. lCI then with the shutter fully cocked to
switch. IC1 then delays the supplies the release signal to IC2. enable the release.
 7. Memory-lock switch. On front
plate, rewind side. Closes when
you push the ML button. The
LEDs turn on. and the auto expo- COUNTER-
ACTUATOR COUNTER GEAR C87
sure remains locked for 10 LEVER
seconds. C96

MAGNET LOCATIONS AND

FUNCTIONS
1. Release magnet. Hybrid magnet
at bottom of mirror box. Fig. 5.
I'hi- release magnet separates
when the release capacitor
discharges through its coil to
release the mirror. SILENT
SPRING
2. Aperture magnet. Hybrid magnet
at wind-lever side of front plate.
The aperture magnet separates WIND
when the aperture capacitor SHAFT
discharges through its coil to latch
the movement of the aperture- RESTITUTION
control lever and stop the LEVER C19
diaphragm. FIGURE 9
3. Shutter magnet. Electromagnet in
shutter block, Fig. 21. Energized
when the release switch closes to
hold the 2nd curtain.

BASIC OPERATION
Note: The circuit operation is nearly
the same as that in the Super Program MAIN
GEAR
and Program Plus. However, since the C30
P3 uses an LED display, the clock
only turns on when you push the
release button part way.
1. The circuit uses two ICs on the
underside of PC board T100:
ICI. Timing/control IC on the
rewind side. Fig. 6. ICI has the
built-in oscillator and supplies the
clock signal.
IC2. Interface and decoder/driver
on the wind side. Fig. 6. 1C2
switches the control transistors FIGURE 10
and drives the LEDs.
2. Turning on the main switch
supplies battery voltage to the cir-
cuit. When you push the release timing switch in the shutter block. optical encoder supplies the feed-
button part way, SWS closes. If the timing switch is closed — back signal to IC2. The count
Now ICI supplies the clock and and the wind-completion switch from the optical encoder is com-
SV signals to IC2. is open — ICI supplies the pared to the count stored in ICI
3. IC2 receives the mode and TV release signal to IC2. If the self- memory. When the counts are
information as digital signals from timer switch is closed. IC I delays equal. IC2 stops the diaphragm
the shutter-speed PC board. The the release signal for 12 seconds. by turning on the aperture transis-
BV and AV signals are analog 5. When IC2 receives the release tor. Fig. 16. The aperture capaci-
values input to IC2. When IC2 signal from ICI, it turns on the tor then discharges through the
receives the SWS and clock sig- release transistor. Fig. 16. The coil of the aperture magnet. The
nals, it turns on the LEDs accord- release capacitor, Fig. 3. dis- aperture magnet separates, slop-
ing to the mode and exposure charges through the coil of the ping the aperture-control lever
inputs. release magnet. The release 7. Closing the release switch SWR
4. When you fully depress the magnet separates, releasing the also energizes the shutter magnet
release button, the release switch mirror. in the shutter block. IC2 turns on
SWR closes. ICI then checks the 6. As the diaphragm closes, the the shutter transistor, Fig. 16, to
 switch low the brown magnet
lead.
8. The mirror mechanically releases
the shutter. As the first curtain
runs, it opens the timing switch in
the shutter block. ICI now starts
timing the exposure. To end the
exposure. IC'l commands IC'2 to
shut off the shutter magnet. IC2
turns off the shutter transistor.
The brown magnet lead switches PAWL
high, and the shutter magnet
releases the second curtain.
9. As you cock the shutter for the
next exposure, the wind-
completion switch closes. The
wind-completion switch clears the
counters in ICI and inhibits the
shutter release. With the shutter
fully cocked, the wind-completion
switch opens to enable the
shutter-release signal.
FIGURE 11

DISASSEMBLY HIGHLIGHTS
Settings for disassembly: main switch
off. speed knob on flash setting (100)
Locations of left-hand threads: wind- 2ND GEAR C31
lever screw. Fig. I
Sequence:
1 bottom cover (3 screws) —
rewind button and batteries loose
2. top cover
- wind-lever cover (1 screw,
underside)
- wind lever (left-hand screw)
Note: The early style wind-lever screw
has spanner notches. The current style.
Fig. 4. is a crosspoint screw. The
wind-lever screw has locking agent on SPOOL
the threads. Use acetone or the heat GEAR
from a soldering iron to soften the SPROCKET
locking agent. GEAR C33

- top-cover nut around wind shaft FIGURE 12

- rewind knob (screw at lop) - —
rewind shall loose
- 5 top-cover screws (the 2 screws at
the front of the camera have long - 5 DX-block wires from PC 10. cock shutter
shoulders) board T100 (pink, green, yellow, 11. remove 2 upper mirror-box
- lift the top cover and unsolder the brown, purple) screws (I on either side of
black wire from PC board TI00 and - wind-eompletion-swilch wire eyelens)
the gray wire from the shutter-speed from PC board T100 (orange) 12. remove 4 front-plate screws
PC board. Fig. 21. - battery-box wire from PC hoard 13. lift out fronl-plaie/mirror-box
3. remove handgrip leather T100 (red) assembly
4. remove handgrip (crosspoint 7. pull red, white, and brown 14. remove shutter-speed base plate.
screw and large minus-head plug) shutter-block wires to wind-lever Fig. 7 (3 screws in early models.
5. remove right and left front leather end of camera (the wires pass to 2 screws in later models)
6. unsolder 1 I wires from top of the front of the pentaprism) 15. remove shutter block (2 screws at
camera. Fig. 21 8. remove screws holding shutter- top of curtain unit. 1 black zinc
- 4 shutter-block wires (white, speed PC board (4 screws in early screw at back of aperture)
red. and brown from PC board models. 2 screws in later models) Reassembly highlights:
T100. gray from shutter-speed PC 9. remove 2 screws holding main
board) switch 1. Before you replace the mirror
 box, cock the shutter. The mirror
box should be released with the
mirror down.
2. To check the assembly after you
install the mirror box, advance
the wind lever to charge the mir- Note: The wind-lever shaft (click-cam 22. lift out spool gear. Fig. 12
ror. Release the mirror by push- assembly) is loose. A spring washer
ing the release-magnet armature fits over the shaft (between the click Note: To remove the sprocket or take-
toward the front of the camera — cam and Ihe winding seat). up spool, remove the bottom
work through the cutout at the 6. remove screw connecting shutter- mechanism plate.
bottom of the camera. Fig. 2. charge lever to ratchet-wheel
3. Before installing the lop cover, Sequence:
post. Fig. 2
push the main switch to ihe off 7. disconnect shutter-charge lever 1. remove white plastic sprocket
position (toward the back of the from ratchet wheel latch (R lever). Fig. 8 (E-clip,
camera. Fig. I). Turn the shutter- 8. remove brass collar from ratchet- spring)
speed brush fully clockwise wheel post 2. unscrew nut above sprocket hook.
(flash-speed setting). Note: The brass collar sits shoulder Fig. 8
Sequence to remove flex (PC board up. The shutter-charge lever then fits Note: Hold up the sprocket hook
T100): over the shoulder. (sprocket-engaged position). Also hold
Note: The mirror box doesn't have to 9. remove winding-guide plate the sprocket. Then use a 3mm box
be removed. If the mirror box is still assembly. Fig. 2 (3 screws — driver to unscrew the nut.
installed, remove the screws holding short screw goes to front of 3. unscrew sprocket hook
the main switch and the screws hold- camera) 4. remove bottom mechanism plale
ing the shutter-speed PC board. 10. remove screw and lift aside wind- (3 screws)
Remove the shutter-speed base plate. completion switch. Fig. 2 (not 5. remove take-up spool (note loose
Fig. 7, to reach the LED display. necessary to unsolder wire) plastic cap that fits over lower
1 I. remove transport latch. Fig. 2 (E- end of spool)
1. remove screw and separate LED
display from mirror box clip — disconnect the spring from 6. remove sprocket shaft
2. unsolder all wires from flex the transport latch: Fig. 8 shows Note: A pin on the side of the
except 3 wires from photocell the location of the spring) sprocket shaft fits within the sprocket.
board (2 black. I red) 12. remove ratchet wheel. Fig. 2 Hold the sprocket and turn the
(screw and washer) sprocket shaft. When the pin aligns
3. remove 2 hot-shoe contact pieces.
Note: The return spring hooks against wilh the notch at the bottom of the
Fig. 3
the edge of the ratchet wheel. Fig. 2. sprocket, you can lift out the sprocket
4 lift photocell board clear of
As you lift out the ratchet wheel, shaft.
eyelens frame
5. remove PC board TIOO (held by allow the spring to unwind (partial 7. remove sprocket
double-sided tape on each IC. turn). You can leave the return spring Note: The sprocket spring, sand-
Fig. 6) in the camera body. Fig. 8: one end of wiched by two washers, sits inside the
the return spring fits under a lip on the sprocket. To remove the spring, take
post. off ihe sprocket key (lower end of
Reassembly highlights: 13. lift out the wind shaft. Fig. 9 sprocket).
After you replace the flex, check the Note: The main gear. Fig. 10, nor-
alignment of the LED display. If the Reassembly highlights, bottom
mally stays with the wind shaft.
mirror box is installed, check the mechanism plate:
14. disconnect restitution-lever spring.
alignment before you replace the Fig. 9, from body casting
shutler-speed base plate. Connect a 15. remove restitution lever (screw, 1. Seat the take-up spool and ihe
jumper between the ground land on spring, post, and lever) sprocket from the back of the
the shutter-speed PC board and the 16. disconnect spring of counter- camera. The sprocket key (insert
camera body. You can then turn on actuator lever. Fig. 9. from lab on with notch) faces the bottom.
Ihe LFDs by closing SWS. If the mir- lop mechanism plate 2. Seat the sprocket shaft, passing its
ror box is removed, you can power 17. remove counter-actuator lever pin into the notch at the bottom
the circuit as described in "Circuit (remove screw — loose spring of the sprocket. Hold down the
Tests." P3. Loosen the screw and shift and washer on top of counter- sprocket shaft and turn it a partial
the LED display for adjustment. aciuator lever) — the counter turn. The sprocket shaft then stays
gear can now be separated from in place.
Sequence to disassemble transport: the counter-actuator lever 3. Replace the bottom mechanism
1. remove wind lever 18. remove silent (ratchet) spring. plate.
2. disconnect counter-dial spring Fig. 9 4. Screw on the sprocket hook.
from counter-retainer nut. Fig. 7 19. remove top mechanism plate (3 5. Replace the R lever (sprocket
3. unscrew counter-retainer nut screws countersunk screw goes latch).
4. remove counter dial together with at back corner, shoulder screw 6. After you complete the reassem-
counter-dial spring goes toward center of body) bly of ihe transport, adjust the
5. remove winding seat. Fig. 7 (3 20. remove 2nd gear. Fig. 12 (minus- position of the sprocket hook.
screws — the long screw goes to head screw) Hold the wind lever in the fully
the back of the camera) 21. lift out sprocket gear. Fig. 12 advanced position. Then turn the
 sprocket hook to obtain the space
shown in Fig. 13. Hold up the
sprocket hook (sprocket-engaged
position) as you screw on the nut.
Don't tighten the nut so much
that it changes the position of the clockwise before replacing the threaded post for the nut is
sprocket hook. Rather, after ratchet wheel. Hook the upper toward the front of the camera.
screwing down the nui and end of the return spring against Fig. 3. The two styles will not
rechecking the adjustment, lock the edge of the ratchet wheel. interchange (if necessary, replace
the nut with a dab of cement. Then turn the ratchet wheel both the LED block and PC
Check the sprocket-hook adjust- clockwise as you seat it over the board T100). The old-style LED
ment three times to make sure the wind shaft. block and the old-style PC board
space gap is correct. 13. Seat the counter dial. Turn the T100 are no longer supplied.
counter dial fully counterclock- new-style LED block —
wise to its stop. Screw on the 0100-01
Reassembly highlights, gear timing for counter-retainer nut.
transport: new-style PC board —
14. Hook the upper end of the T100-01
1. Seat the spool gear with its two counter-dial spring to a slot in the
Fig. 19 shows the wiring diagram
slots over the two brass tabs counter-retaining nut. Use a slot
for the early style PC board: Fig.
inside the top of the take-up that's around 90 degrees from the
21 shows the wiring for the new
spool. resting position of the spring end.
style.
2. Turn the upper end of the Cement the upper end of the
counter-dial spring to the counter- 4. The CPU IC on the underside of
sprocket shaft until its two flat
retaining nut. PC board T00-01 has been
sides are parallel to the ends of
revised to improve the operation
the body casting.
of the memory-lock switch (see,
3. Seat the sprocket gear with its
REVISED SECTIONS "Operating Instructions" — #9).
timing mark (slot at top) in a 1
You can identify the 1C by the
o'clock position. Fig. 12. 1. The current version of the camera markings. Fig. 16.
4. Replace the 2nd gear with its tim- has a cable-release socket 0-A162
ing punch mark (lower gear sec- (front, rewind side). A blue wire old-style IC —
tion) aligned with the timing connects the cable-release socket M5840A-158
mark on the sprocket gear. The to PC board TI00. Fig. 21. If the new-style IC —
other punch mark on the 2nd camera has the version of PC M5840A-166
gear (upper gear section) now board TI00 shown in Fig. 21 — 5. The wind-lever screw C139 has
points to the spool gear. Fig. 12. but doesn't have the cable-release been changed to a crosspoint
5. Position the pawl on the under- socket — the blue-wire land is head (the old style has spanner
side of the top mechanism plate empty. Shorting across the cable- notches) to make assembly easier.
as shown in Fig. 11. release socket (or shorting the Only the new style is now
6. Seat the top mechanism plate and blue wire to ground) releases the supplied.
replace the screws. Then swing mirror. To add the cable-release 6. The nut holding the sprocket
the pawl clockwise until it's socket, the front plate was hook. Fig. 8, has been changed to
against the 2nd gear. changed (threaded hole added). make assembly easier. The old
7. Replace the silent spring. Fig. 9. style has spanner notches. You
old-style front plate A100
8. Seat the main gear with any one can use a box driver (3.0mm) to
new-style front plate — remove the new style. Fig. 8.
of its 3 punch marks aligned with
the punch mark on the 2nd gear. A100-0I Only the new style is now
Fig. 10. 2. When Pentax added the cable- supplied.
9. Seat the wind shaft as shown in release socket, they also changed
Fig. 9. Hold aside the wind-shaft the focusing screen. The new-style
pawl until it seats against the Fresnel has a rectangular micro- TROUBLESHOOTING
outer edge of the main-gear cam. prism focusing aid: the old style
has a round microprism around Behavior without batteries: shutter
10. Scat the counter-actuator lever won't release
with the counter gear. Fig. 9. the split-image focusing aid. Both
styles are supplied. Behavior without lens: only manual
With the counter-actuator lever
old-style Fresnel — mode
parallel to the ends of the body
casting, the pie-shaped cutout of 24500-L2 Typical current draw:
the counter gear should face the new-style Fresnel — - release pushed part way
rewind end of the body. Fig. 15. 25302-L2 (LEDs on) — 7ma
To change the timing, lift the 3. The LED block and the PC board - shutter held open on bulb
counter-actuator lever and turn TI00 have been revised. In the —30ma
the counter gear. original design, the flex-connector Tips for troubleshooting without
11. Replace the restitution lever. Fig. posts are on the LED block; the disassembly:
9, the wind-lever shaft, and the threaded post for the nut is
winding seat. toward the back of the camera. In 1. If the shutter won't release and
12. From the bottom of the camera, the new style, the flex-connector there's no LED display, try turn-
turn the wind shaft fully counter- posts are on PC board T100; the ing the main switch off and then
 0 - 0.2mm

MIRROR-
CHARGE
LEVER
SPROCKET
HOOK

FIGURE 13

FILM-
APERTURE TAKE-UP SPOOL
SIDE SIDE

FIGURE 14

COUNTER
GEAR
REWIND
END OF
CAMERA

PARALLEL TO
ENDS OF
CAMERA
FIGURE 15
 SYMBOLTP

LED PC BOARD

FIGURE 18

RED(S100)
PURPLE (A150)
PINK (I300)
BROWN (A150)
BLACK (S100)
GREEN (A150)
ORANGE (G100)
GRAY (G100)
YELLOW (0-K110)

T100

PINK (G100) GRAY (0-A114)

SKY BLUE (M11) PINK(M12)

FIGURE 19
 on. If the LEDs now turn on
when you push the release button
part way — and turn off when
you fully depress the release but-
ton — yet the shutter doesn't
release, the problem is probably plate. SWS. The "P" LED should turn
the release magnet. b. Connect a jumper between the on.
2. If the camera won't switch to timing-switch land on the PC g. Short the timing-switch land
program mode with the lens at board TI00, Fig. 21. and the (white wire. Fig. 21) to ground
"A," try shorting the A/M lens- front plate. and close SWS. The LEDs should
mount contact, Fig. 2, to ground. c. Connect 3 V between the bat- turn on. Now close the release
The "P" LED should now turn tery contact on PC board T100, switch. The LEDs should turn off.
on when you push the release Fig. 21, and the front plate. 5. LED display, removed
button part way. If so, the prob-
d. Close SWS, Fig. 1. The LED a. Check using a 2.8V power
lem is probably poor contact
display should turn on (except at supply. Connect a 300-ohm resis-
between the lens and the lens
the bulb setting) and remain on tor to one power-supply lead to
mount.
10 seconds after SWS opens. limit the current through the
Frequently repaired sections: With no lens, you should get the LEDs.
"M" LED, the shutter-speed LED b. By touching the positive
Shutter curtains damaged, caused by that corresponds to the setting of
the operator during film-loading. power-supply lead to one of the
the shutter-speed brush, and the terminals labeled " + " in Fig. 18,
Replace the shutter block. metering LED (the shutter-speed and then touching the negative
LED that flickers to indicate the power-supply lead to one of the
CIRCUIT TESTS proper exposure setting). With terminals labeled "-" in Fig. 18,
1. Optical encoder the lens installed and set to "A," you should be able to turn on
you should get the "P" LED and each of the LEDs individually.
Construct the test circuit shown
the metering shutter-speed LED. The following chart shows which
in Fig. 20. You can then check
the optical encoder from the lop e. Charge the mirror by pushing LED should turn on for each
of the camera. Fig. 21. Discon- forward the mirror-charge lever. combination of power-supply
nect the sky blue (phototransis- Fig. 5. connections:
tor) and orange (LED) wires of f. Close the release switch SWR.
the optical encoder. Connect the The mirror should release and
-LEAD + LEAD LED
wires to the test resistors as move to the raised position. The
shown in Fig. 20. Push in the LED display should turn off. 3 4 1
depth-of-field preview lever to g. The LED display remains off,
rotate the optical-encoder disc. As even after you return the mirror, 3 S 2
the disc rotates, you should get a because of the jumper between
sine-wave signal on the scope. If 3 6 4
the timing-switch land and
not, either the phototransistor or ground. Momentarily disconnect 3 7 S
the LED may be defective. the jumper. The LEDs should
Replace the diaphragm-control then turn on when you close 2 4 15
block G100. SWS.
2. Dedicated-flash changeover 2 5 30
a. Set the lens to a manual f/stop. 4. PC board T100, removed
2 6 60
b. Select a shutter speed between a. Bridge the lands of the main
1/1000 and 1/125. switch. Fig. 17. 2 7 125
c. Connect 2.4V to the pink-wire b. Connect hook-up wires to the
1 4 250
hot-shoe contact piece ( + ), Fig. V-bat (+) and ground lands, Fig.
21. 21. 1 5 500
d. Close the light-metering switch. c. Apply 3V between the hook-up
The flash-symbol LED and the wires. 1 6 1000
"M" LED should turn on. d. Close SWS. The LEDs should P
symbol 6
e. Select a shutter speed between turn on and remain on for 10
1/60 and 1/2. When you now seconds after SWS opens. The symbol 5 M
apply voltage to the hot-shoe con- "M" LED and the shutter-speed
tact piece and close the light- LED indicating the selected shut- symbol 7 flash symbol
metering switch, the shutter-speed ter speed should turn on. The
LED (as well as the "M" LED "1000" LED should be flickering.
and the flash-symbol LED) Troubleshooting steps for specific
e. Close the release switch SWR.
should turn on. problems:
The LEDs should remain on, but
3. Circuit, mirror box removed the "1000" LED should stop I. Shutter won't release, no LEDs
a. Connect a jumper between the flickering and glow steadily. Battery voltage to circuit
ground contact on the shutter- f. Short the A/M land (green Check for 3V between ground
speed PC board and the front wire. Fig 21) to ground and close and the red wires (+), Fig. 21. No
 BODY
GROUND
1.5 V

330 2K

SCOPE
VERTICAL
INPUT

LED TR

FIGURE 20 OPTICAL ENCODER TEST CIRCUIT

 voltage — battery box or wiring.
Main switch
With the main switch in the on
position, check for 3V at the
main-switch IP, Tig. 17. No vol-
tage poor contact in the main Timing switch 21, to ground and release the
switch or poor solder between the With the shutter cocked, check shutter. The shutter should stay
main-switch flex and PC board continuity between the white wire open. If not. the shutter magnet is
T100. Fig. 17. Or short between (rewind side of PC board TI00) open or dirty.
the main-switch connections. Fig. and ground. You should measure PC board T100
17. and close SWS. If the LEDs direct continuity. If not, check the Check at the brown magnet wire.
then turn on, the problem is poor liming switch, Fig. 21. for poor Fig. 21, as you release the shutter.
contact in the main switch. contact. The brown wire should switch
Ground to shutter-speed PC 3. LEDs won't turn on when you low when the release switch
board push the release button part way, closes. If not. the shutter-magnet
Check for a loose ground screw, but do turn on when you release transistor or IC2 may be defec-
Fig. 3. the shutter tive. Fig. 16.
Oscillator SWS 6. LED always shows "1000"
Close SWS and check for the sine Check by shorting the SWS TP. (flickering), diaphragm stops
wave at cither lead of the crystal. Fig. 21, to ground. If the LEDs down fully on program mode
Fig. I. No signal — poor solder then turn on, the problem is poor F-value (aperture) resistor
to crystal, crystal defective, or contact in SWS, Fig. 1, or poor Check the resistance between the
1CI defective. solder between the shutter-speed two yellow wires. Fig. 21. At f/8.
Clock flex and PC board T100, Fig. 16. you should measure 5.9K.
Close SWS and check for the 4. Diaphragm always stops down
clock signal at the clock TP, Fig. fully on program mode
Aperture magnet, aperture- OTHER COMMENTS. PART
21. No signal IC" I defective. NUMBERS
!. Shutter won't release, LEDs magnei capacitor
operate Cock the shutter and short the 1. The flex circuit is supplied only as
Release switch SWR gray lead of the aperture magnet. a complete unit including the
Check at the SWR TP. Fig. 3. Fig. 21. to ground. You should photocell board. New-style flex
The TP should connect to ground hear a click as the aperture PC board T100-01.
with the release switch closed. Or magnet separates. When you then 2. The LED block is supplied separ-
short the SWR TP to ground. If release the shutter, the diaphragm ately- See. "Revised Sections" #3.
the shutter then releases, the prob- should remain fully open. No 3. The main-switch block is supplied
lem is poor contact in the release click — check the aperture- separately — 1200.
switch or poor solder between the magnet coil between the gray and 4. The Seiko shutter block is supp-
shutter-speed flex. Fig. 16, and pink wires. Fig. 21. Approximate lied only as a complete unit —
PC board 1100. coil resistance — 16 ohms. You O-E000."
Release magnet, release capacitor can check the aperture capacitor. 5. The spool-film sheet behind the
Check if the LEDs turn off when Fig. 3. by substituting a 47 micro- take-up spool is held by double-
you close the release switch and farad capacitor. sided tape. If you do remove the
won't again turn on until you turn Optical encoder spool-film sheet, it's best to install
the main switch off and then on. See, "Circuit Tests" — #1. a new part on reassembly. The
Short the black lead of the release A/M switch drawing here shows the position
magnet, Fig. 21, to ground. If the for installing a new spool-film
Check the LED display with the sheet.
shutter then releases, the release lens at "A." Ifthe"P"LED
magnet and the release capacitor doesn't turn on, the problem may 0.1 - 0.3 mm
arc o.k. If the shutter doesn't be poor contact between the lens
release, check the release magnet and the A/M contact at the front
between the red and black leads. A63 A64
of the lens mount. Check the cir-
Fig. 21. Approximate coil resist- cuit by shorting the green A/M
ance — 12 ohms. Also check for wire, Fig. 21, to ground. If the
a dirty release-magnet interface. 0.2 - 0.5 mm
circuit is o.k.. the "P" LED will
You can check the release capaci- turn on. Still no "P" LED — IC2
tor. Fig. 3. by substituting a 47 defective. 6. Other part numbers:
microfarad capacitor. - top cover — A300
Note: If all tests check o.k.. but the
Wind-completion switch diaphragm still stops down fully, the - diaphragm-control block (aper-
With the shutter cocked, check problem mav be an open aperture- ture magnet, optical encoder) —
the voltage at the orange wind- magnet transistor or a defective IC2, G100
completion-switch wire, Fig. 21. Fig. 16. Replace PC board T100. - release-magnet block — S100
The voltage should be high. If
you measure 0V, the wind- Note: Part numbers for the transport
5. Shutter delivers fastest speed only
completion switch isn't opening arc shown on the illustrations.
Shutter magnet
or the orange wire is pinched. Short the brown shutter wire. Fig.