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User Manual
Similar models: P5 (mechanically the
same). Super Program and A3000
(electronically similar)
Product #: P30 (domestic version) —
25300; P3 (American version) —
25301
Batteries: 2ea S76 (negative ground)
Fig. I —top cover removed
Fig. 2 bottom cover removed, wind
lever held partially advanced
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
Fig. 8—bottom view of wind side,
ratchet wheel removed
Fig. 9—top view of wind side, wind-
ing seal removed
Fig. 10 top view of wind side, wind
shaft removed
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)
Fig. 17—lest points, main-switch
block
Fig. 18—test points, LED block
Fig. 19—wiring variations, early style
PC board T100
Fig. 20—test circuit for optical
encoder
Fig. 21 —wiring pictorial and test
points
ADJUSTMENT LOCATIONS:
Aperture-control voltage
Auto exposure
Focusing screen
Wind-completion switch
Sprocket hook
Travel time. 2nd curtain
Travel time, 1st curtain
Timing switch (fast speeds)
Shutter release
PENTAX P3, P30
CRYSTAL
MAIN SWITCH
FIGURE 1
WIND-COMPLETION
SWITCH
RATCHET
SHUTTER-
WHEEL
CHARGE
LEVER
0-C106
FIGURE 2
Not shown:
Aperture-value resistor. Variable resis-
tor at back of front plate, wind side
top (near mirror box).
Mirror angle. Hex nut on wind side of
mirror box, under mirror (reach
through lens opening).
•There are four adjustment points for
the height and level of the focusing
A
screen. To reach the two adjustments
B
at the front, remove PC board T100
C*
(flex). However, if the focus at the
D
focusing screen is incorrect, you can
E
make minor adjustments on the mir-
F
ror angle. Use a 2.5mm hex key to
G
turn the hex nut.
H**
**lf you adjust the timing switch.
I
APERTURE-
VOLTAGE
B
A
TP
c
A/M CONTACT
D
E
TRANSPORT
LATCH 0-C108
DEPTH-OF-FIELD
PREVIEW LEVER
sws
SHUTTER-
SPEED
PC BOARD
MECHANICAL
RELEASE
WINDING-GUIDE
PLATE ASSEMBLY
0-C102
apply conductive paint between the
timing-switch adjustment and the
shutter mechanism plate to improve
the ground.
ADJUSTMENT VALUES:
Curtain-travel time: 6.05 ± 0.3ms
(21mm distance), 5.76ms (20mm
distance)
Flange-focal distance: 45.46 ±
0.04mm (flange to film rails)
Aperture-control voltage: 500 ±
l00mv P-P
Battery check: 2.45V — LEDs normal
2.35V — LEDs pulse
on and off
LEFT-
HAND
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Related Manuals for Pentax P3
Summary of Contents for Pentax P3
- Page 1 Similar models: P5 (mechanically the same). Super Program and A3000 PENTAX P3, P30 (electronically similar) Product #: P30 (domestic version) — 25300; P3 (American version) — 25301 Batteries: 2ea S76 (negative ground) APERTURE- VOLTAGE Fig. I —top cover removed DEPTH-OF-FIELD PREVIEW LEVER Fig.
-
Page 2: Adjustment Procedures
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... - Page 3 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 and the porous-plastic light trap at the top of the mirror box MIRROR- should be 1 - 3mm.
- Page 4 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.
-
Page 5: Basic Operation
Super Program MAIN GEAR and Program Plus. However, since the 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. - Page 6 switch low the brown magnet lead. 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.
- Page 7 "Circuit of the sprocket. Hold down the (remove screw — loose spring Tests." P3. Loosen the screw and shift sprocket shaft and turn it a partial and washer on top of counter- the LED display for adjustment.
-
Page 8: Troubleshooting
3 punch marks aligned with A100-0I Only the new style is now the punch mark on the 2nd gear. When Pentax added the cable- supplied. Fig. 10. release socket, they also changed Seat the wind shaft as shown in the focusing screen. - Page 9 0 - 0.2mm MIRROR- CHARGE LEVER SPROCKET HOOK FIGURE 13 FILM- TAKE-UP SPOOL APERTURE SIDE SIDE FIGURE 14 COUNTER GEAR REWIND END OF CAMERA PARALLEL TO ENDS OF CAMERA FIGURE 15...
-
Page 12: Led Pc Board
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... - Page 13 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 SWS. The "P" LED should turn plate. release, the problem is probably the release magnet.
- Page 14 BODY GROUND 1.5 V SCOPE VERTICAL INPUT FIGURE 20 OPTICAL ENCODER TEST CIRCUIT...
- Page 16 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- 21, to ground and release the Timing switch tage poor contact in the main shutter.