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Pentax ME Service Manual

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Download this manual See also: Operating Manual, User Manual
PRODUCT No.23900
ASAHI PENTAX
SERVICE MANUAL
ENGLISH

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Summary of Contents for Pentax ME

  • Page 1 PRODUCT No.23900 ASAHI PENTAX SERVICE MANUAL ENGLISH...
  • Page 2 2 3 9 0 0 Disassembly Procedure 1. Self-timer charge lever assembly (0-A118)—Self-timer screw left-handed (A122) — 231K-H50 2. Body Covering, left and right (A19, A20) 3. Install self-timer lever assembly (0-A118) temporarily. 4. Bottom cover assembly (A400) — CSS 1.7 x 2.8 x 3 Connector seat (A23), R button (C117) 5.
  • Page 3 19. Counter dial Back cover open Counter dial spring (C57) - Counter retainer plate (C25), Counter dial assembly (0-C34) Come off transporting claw spring (C65) Remove (C146) (C53) and CNS 1.7 x 3 Winding seat assembly (0-C2) - (0-C5) - (C7) 20.
  • Page 4 Assembly Procedure 1. Spool assembly (0-C204) and spool cam assembly (0-C202) W17 (t=0.2mm) 2. Top mec. Plate assembly (0-C1) Pulling back transport indicator 3. Sprocket shaft pin (C40) Apply screw lock on Set T 1.7 x 1.6 4. Winding shaft assembly (0-C22) - Main gear (C30) 5.
  • Page 5 11. Shutter block (E000) - CNL-D 1.7 x 3 x3 Light seal plate (A8) 12. Bulb actuator plate (A504) Temporary installation - CNL-D 1.4 x 2 13. Back cover assembly (A200) 14. Winding seat assembly (0-C2) - (C53), (C146), CNS 1.7 x 3 Install (0-C2) with back cover open Winding lever click cam assembly (0-C5) Winding lever friction spring (C7)
  • Page 6 18. Cocked shutter assembly (0-C23) - SW actuator lever shaft. 19. Main SW adjustment = (I200) When shutter actuator plate is held in "ON" position, 0.2mm clearance is necessary between longer contact piece of main SW and insulation blue collar. To adjust the clearance, bend the shorter contact piece.
  • Page 7 b) LED indication adjustment High EV (EV12), EV16) VR-B Low EV (EV8) VR-C c) Battery checker - VR-D 2.45V - Turning on and off (flickering) 2.55V - Turning on d) VR-E is prohibited to adjust 29. Counter indication (C15) - (A300) 30.
  • Page 8 34. Body covering, self-timer lever assembly (0-A118) Self-timer screw (A122) - left-handed. 35. Disassembly of front board and mirror housing a) Remove self-timer (H000) b) Mirror release lever (0-A111) c) Mirror housing d) Connector (I100) - only loosening (I2) e) Unsolder 5 lead wires Purple 2, orange 2, black 1 36.
  • Page 9 37. Adjustment of SWm and SWg Time lag sequence of SWm and SWg To check the time lag, an oscilloscope is necessary. The time lag is determined by the variation in voltage when SWm and SWg turn "ON" and "OFF". Here is one example for time lag check with a single-trace oscilloscope.

  • Page 10: Adjustment Locations

    PENTAX ME Notes and Troubleshooting Tips FIGURES: Fig. 1 - Top cover removed Fig. 2 - Bottom cover removed Fig. 3 - Front of camera, wind side Fig. 4 - Front view, mirror box removed Fig. 5 - Bottom of mirror box Fig.

  • Page 11: Adjustment Sequence

    ADJUSTMENT SEQUENCE: 1. Auto speeds Variable resistor A set: ASA 100, X1 compensation, f/8. With 2.8V supplied to the battery compartment, the shutter should deliver the following shutter speeds ath the indicated light levels: EV12 1/60 second EV16 1/1000 second 1/4 second 2.
  • Page 12 10. Slide LED display out of focusing screen slot at wind-lever side 11. Lift out complete flex circuit (Underside of flex circuit may be glued to top of pentaprism) 12. Unsolder 5 leads form front-plate circuit board 13. Unsolder green wire and blue wire from power winder terminals 14.

  • Page 13: Troubleshooting

    TROUBLESHOOTING: Typical battery drain Meter: 1.7-2.0mA Shutter open: 10mA Behaviour with batteries Fastest speed only except at mechanical shutter settings Replacement parts Circuit board T100 and Seiko shutter E000 available from Pentsx only as complete modules; other parts available individually Troubleshooting steps for specific problems Shutter gives only mechanical speed at auto, LEDs don't turn on Battery voltage at flex circuit...
  • Page 14 Auto-exposure erratic, shutter sometimes delivers mechanical speed only. Memory time lag Chattering in magnet switch Check the timing between the magnet switch and the memory switch by plugging the modified circuit board (Fig. 7) into the mirror- box connector I100. Power the special circuit board with a 6V DC power supply.
  • Page 15 4. Yellow - "Over" LED remains on, shutter delivers mechanical action only 5. White - LEDs work, shutter delivers mechanical action only 6. Blue - LEDs do not work, shutter delivers mechanical action only 7. Brown - LEDs work, shutter delivers mechanical action only 8.
  • Page 16 23900 Page 15 of 15...