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Pentax ZX-5n Mirror Motor Gear Replacement

Pentax ZX-5n Mirror Motor Gear Replacement

Sam Gustafson

Sam Gustafson다른 한 명의 기여자

최종 수정일 February 18, 2025

2 시간
어려움
커뮤니티-기여 안내서

A common failure of the Pentax ZX/MZ cameras is the Mirror Motor Gear. The gear drives core functions of the camera including the shutter and mirror movement. If it fails, the shutter will no longer fire and the mirror will be stuck close in the up position.

This guide explains how to disassemble the camera to access the Mirror Motor Gear as well as how to install a new gear. A general understanding of how cameras work is recommended. Some technical soldering is also required.

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  1. Pentax ZX-5n Mirror Motor Gear Replacement, Remove back cover: 1 단계, 이미지 1개 중 1개
    • Push down on the screw to depress the spring loaded hinge and release the door.

  2. Pentax ZX-5n Mirror Motor Gear Replacement, Remove bottom cover: 2 단계, 이미지 1개 중 1개
    • Remove six 5.3 mm #00 screws.

    • Remove one 3.4 mm #00 screw.

    • The short screw has a machine thread and screws into the plate underneath. The rest screw into the plastic body.

  3. Pentax ZX-5n Mirror Motor Gear Replacement, Remove left front cover: 3 단계, 이미지 1개 중 1개
    • Remove three 5.3 mm #00 screws (the bottom-most screw is not always present).

    • Remove one 7.3 mm #00 screw.

    • Remove the remote trigger cover.

  4. Pentax ZX-5n Mirror Motor Gear Replacement, Remove front cover: 4 단계, 이미지 2개 중 1개 Pentax ZX-5n Mirror Motor Gear Replacement, Remove front cover: 4 단계, 이미지 2개 중 2개
    • Remove one 3.4 mm #00 screw.

    • Remove two 5.3 mm #00 screw.

    • Gently lift up on the flash housing to help remove the cover if necessary.

  5. Pentax ZX-5n Mirror Motor Gear Replacement, Remove right front cover: 5 단계, 이미지 1개 중 1개
    • Remove two 3.9 mm #00 screws.

  6. Pentax ZX-5n Mirror Motor Gear Replacement, Remove eye cup: 6 단계, 이미지 1개 중 1개
    • Slide the eye cup up and off to access the screws underneath.

  7. Pentax ZX-5n Mirror Motor Gear Replacement, Unscrew top cover: 7 단계, 이미지 3개 중 1개 Pentax ZX-5n Mirror Motor Gear Replacement, Unscrew top cover: 7 단계, 이미지 3개 중 2개 Pentax ZX-5n Mirror Motor Gear Replacement, Unscrew top cover: 7 단계, 이미지 3개 중 3개
    • Remove two 5.3 mm #00 screws by the eyepiece.

    • Remove one 6.8 mm #00 screw in the battery compartment.

    • Remove one 7.0 mm #00 screw near the take up spool.

  8. Pentax ZX-5n Mirror Motor Gear Replacement, Lift top cover: 8 단계, 이미지 1개 중 1개
    • Lift the cover so it is just free of the body. It is still attached by several wires.

  9. Pentax ZX-5n Mirror Motor Gear Replacement, Discharge flash capacitors: 9 단계, 이미지 1개 중 1개
    • Use a 1kΩ-10kΩ resistor to discharge the capacitor. Place the resistor between the blue wire, exposed in the previous step, and ground.

    • The flash capacitors store energy at a very high voltage. Failing to discharge the capacitors properly could result in personal injury and/or damage to the camera.

  10. Pentax ZX-5n Mirror Motor Gear Replacement, Unsolder flash connections: 10 단계, 이미지 1개 중 1개
    • Unsolder one green wire.

    • Unsolder one blue wire.

    • Unsolder one brown wire.

    • Unsolder one black wire.

  11. Pentax ZX-5n Mirror Motor Gear Replacement, Unsolder remaining connections: 11 단계, 이미지 3개 중 1개 Pentax ZX-5n Mirror Motor Gear Replacement, Unsolder remaining connections: 11 단계, 이미지 3개 중 2개 Pentax ZX-5n Mirror Motor Gear Replacement, Unsolder remaining connections: 11 단계, 이미지 3개 중 3개
    • Unsolder one black wire.

    • Pull black wire out from its routed location.

    • Unsolder flex connector

    • Be careful not to overheat the flex circuit. Work in short durations. Allow for cool downs in between if necessary.

    • Some repairs can be performed with the top cover still connected but the flex connection is fragile and easily damaged.

  12. Pentax ZX-5n Mirror Motor Gear Replacement, De-solder battery connections: 12 단계, 이미지 1개 중 1개
    • De-solder the indicated joints. Use a solder sucker on the tabbed connections.

    • Pull the black wire from the battery flex to get more slack in the connection to the top cover.

    • Be careful not to overheat the flex circuit. Work in short durations. Allow for cool downs in between if necessary.

  13. Pentax ZX-5n Mirror Motor Gear Replacement, De-solder flex posts: 13 단계, 이미지 1개 중 1개
    • Use a solder sucker to de-solder the four posts from the flex circuit.

    • This is the most difficult part of the repair. Patience and persistence are required.

    • Be careful not to overheat the flex circuit. Work in short durations. Allow for cool downs in between if necessary.

  14. Pentax ZX-5n Mirror Motor Gear Replacement, De-solder flex connections: 14 단계, 이미지 1개 중 1개
    • Unsolder film advance motor connections.

    • Unsolder sprocket counter connections.

    • Unsolder power and ground connections.

    • Unsolder panorama switch connections.

    • Be careful not to overheat the flex circuit. Work in short durations. Allow for cool downs in between if necessary.

  15. Pentax ZX-5n Mirror Motor Gear Replacement, Unscrew flex circuit: 15 단계, 이미지 1개 중 1개
    • Remove one 4.3 mm #00 screw.

  16. Pentax ZX-5n Mirror Motor Gear Replacement, Lift the flex circuit: 16 단계, 이미지 2개 중 1개 Pentax ZX-5n Mirror Motor Gear Replacement, Lift the flex circuit: 16 단계, 이미지 2개 중 2개
    • Gently pry up the plastic carrier under the flex circuit. It may catch slightly on the battery contact tab.

    • Pay close attention to the connections around the four through-hole posts as you lift the flex. Make sure that no solder is left over and that it pulls away freely.

    • This metal tab is lightly held in place with lacquer and can easily come loose. Keep an eye on it.

  17. Pentax ZX-5n Mirror Motor Gear Replacement, Unscrew flash PCB: 17 단계, 이미지 1개 중 1개
    • Remove one 3.3mm #00 screw.

    • Remove one 3.9 #00 screw.

    • De-solder the red wire.

    • Peel off the black tape. Leave it attached to the wires.

  18. Pentax ZX-5n Mirror Motor Gear Replacement, Remove flash PCB and capacitors: 18 단계, 이미지 2개 중 1개 Pentax ZX-5n Mirror Motor Gear Replacement, Remove flash PCB and capacitors: 18 단계, 이미지 2개 중 2개
    • Gently peel the flex circuit from the surface of the capacitor.

    • There may be additional adhesive underneath the larger capacitor.

    • Lift the two capacitors and the flash PCB out as a single unit.

    • The double sided tape used to secure the capacitors can be softened with isopropyl alcohol if necessary.

  19. Pentax ZX-5n Mirror Motor Gear Replacement, Prepare bottom plate: 19 단계, 이미지 2개 중 1개 Pentax ZX-5n Mirror Motor Gear Replacement, Prepare bottom plate: 19 단계, 이미지 2개 중 2개
    • Remove two 3.4 mm #00 screws. Remove the plate holding the contacts in place.

    • Peel tape from the plate. Leave the tape attached to the flex circuit.

    • Remove the flex circuits from their retaining studs.

  20. Pentax ZX-5n Mirror Motor Gear Replacement, Remove bottom plate: 20 단계, 이미지 2개 중 1개 Pentax ZX-5n Mirror Motor Gear Replacement, Remove bottom plate: 20 단계, 이미지 2개 중 2개
    • Remove one 3.3 mm #0 countersunk screw.

    • Remove one 3.9 mm #0 shoulder screw.

    • Remove four 3.3 mm #00 screws.

    • Pull a little slack through the housing on this flex cable.

    • Pop the plate off its posts, rotate slightly clockwise and pull gently through the loosened flex cable.

    • To the camera tech that left me a happy little note...I see you.

  21. Pentax ZX-5n Mirror Motor Gear Replacement, Remove transport gears: 21 단계, 이미지 2개 중 1개 Pentax ZX-5n Mirror Motor Gear Replacement, Remove transport gears: 21 단계, 이미지 2개 중 2개
    • It's best to remove these parts now so they don't fall out later on in the repair.

  22. Pentax ZX-5n Mirror Motor Gear Replacement, Detach DOF preview switch: 22 단계, 이미지 1개 중 1개
    • Remove one 3.8 mm #00 screw.

  23. Pentax ZX-5n Mirror Motor Gear Replacement, De-solder shutter control flex: 23 단계, 이미지 2개 중 1개 Pentax ZX-5n Mirror Motor Gear Replacement, De-solder shutter control flex: 23 단계, 이미지 2개 중 2개
    • De-solder the connections.

    • Lift the flex off the retaining studs.

    • Be careful not to overheat the flex circuit. Work in short durations. Allow for cool downs in between if necessary.

  24. Pentax ZX-5n Mirror Motor Gear Replacement, Remove eye piece assembly: 24 단계, 이미지 1개 중 1개
    • Remove two 5.3 mm #0 screws.

  25. Pentax ZX-5n Mirror Motor Gear Replacement, Unscrew front housing block: 25 단계, 이미지 2개 중 1개 Pentax ZX-5n Mirror Motor Gear Replacement, Unscrew front housing block: 25 단계, 이미지 2개 중 2개
    • Remove two 7.4 mm #0 screws.

    • Remove one 8.3 mm #0 screw.

    • Remove one 3.3 mm #00 screw. The metal bracket will be loose and should be removed as well.

  26. Pentax ZX-5n Mirror Motor Gear Replacement, Lift front housing block: 26 단계, 이미지 1개 중 1개
    • Push the front housing block slightly up then lift the left side up and away from the housing.

    • Proceed slowly and watch for any components that are catching. The right side is still attached by a large flex cable.

  27. Pentax ZX-5n Mirror Motor Gear Replacement, Check for shims: 27 단계, 이미지 1개 중 1개
    • There may be shims at the mounting points of the front housing block.

    • Note the positions and remove if loose.

  28. Pentax ZX-5n Mirror Motor Gear Replacement, Detach mirror motor assembly: 28 단계, 이미지 2개 중 1개 Pentax ZX-5n Mirror Motor Gear Replacement, Detach mirror motor assembly: 28 단계, 이미지 2개 중 2개
    • De-solder the black wire.

    • Remove four 3.7 mm #00 screws.

    • Detach the buzzer from its mounting posts. Use isopropyl alcohol to soften the lacquer if necessary.

  29. Pentax ZX-5n Mirror Motor Gear Replacement, Remove mirror motor assembly: 29 단계, 이미지 1개 중 1개
    • Grab the motor and gently wiggle the plate loose.

    • If it feels stuck, move the sliding plate down, towards the bottom of the camera

  30. Pentax ZX-5n Mirror Motor Gear Replacement, Remove mirror motor: 30 단계, 이미지 2개 중 1개 Pentax ZX-5n Mirror Motor Gear Replacement, Remove mirror motor: 30 단계, 이미지 2개 중 2개
    • De-solder the red and black wires.

    • Remove two #00 screws.

    • Use the lettering on the motor to note its orientation. If installed or wired backwards, the motor will spin in the wrong direction.

  31. Pentax ZX-5n Mirror Motor Gear Replacement, Install new motor gear: 31 단계, 이미지 1개 중 1개
    • Pull off the old gear.

    • Press the new gear on until about 1 mm of the shaft extends past the end.

    • If it is too difficult to press on, use a soldering iron to heat the brass gear. A small amount of thermal expansion should make it easier.

  32. Pentax ZX-5n Mirror Motor Gear Replacement, Check green and yellow drive gears: 32 단계, 이미지 1개 중 1개
    • The green and yellow gears can sometimes slip off their posts while working with the motor.

    • Check that the alignment holes are properly synced before installing the mirror motor assembly.

    • Aperture set lever spring. Note this part for installation of the mirror motor assembly.

  33. Pentax ZX-5n Mirror Motor Gear Replacement, Prepare mirror motor assembly for install: 33 단계, 이미지 2개 중 1개 Pentax ZX-5n Mirror Motor Gear Replacement, Prepare mirror motor assembly for install: 33 단계, 이미지 2개 중 2개
    • Disengage latch so the slide bar can move freely.

    • Move the slide bar about half way down its total travel.

    • Let the latch snap back into place so the slide bar is held in the new position.

    • This ensures that the aperture set lever spring couples properly with the slide bar during reassembly.

  34. Pentax ZX-5n Mirror Motor Gear Replacement, Install mirror motor assembly: 34 단계, 이미지 1개 중 1개
    • Install the mirror motor.

    • Place the left side first. Then swing the right side in, coming up and under the spring loaded lens release.

  35. Pentax ZX-5n Mirror Motor Gear Replacement, Charge mirror: 35 단계, 이미지 1개 중 1개
    • Rotate the grey gear downward until the mirror is in the charged/down position.

  36. Pentax ZX-5n Mirror Motor Gear Replacement, Charge shutter: 36 단계, 이미지 2개 중 1개 Pentax ZX-5n Mirror Motor Gear Replacement, Charge shutter: 36 단계, 이미지 2개 중 2개
    • Push the shutter charge lever upward. You should see the shutter blades move as you do this.

    • The second picture shows the shutter in the charged position. It may already be in this position and not need charging.

    • Gently place the front assembly block. Work it into place until the back of the block is flush to the back of camera.

    • Proceed with the rest of the re-assembly, following the guide in reverse.

결론

To reassemble your device, follow these instructions in reverse order.

다른 7명이 해당 안내서를 완성하였습니다.

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1다른 기여자 명과 함께

Sam Gustafson

회원 가입일: 09/01/22

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안내서 42개를 작성함

댓글 4개

Grazie è semplicemente perfetto

pietro mariani - 답글

I went though this guide it is pretty good and easy. Thanks for your work.
Although I ended up with a camera always in dof mode. When I try to turn it off it buzzes, but the finder stays dark in smaller apertures. Any tips on that?

Szabadkai Levente - 답글

It's hard to say precisely what the issue is but my guess is something around the aperture set lever. Unfortunately, I think you have to take it all apart and put it back together. Sometimes you just miss something. I would double check steps 32 and 33 and make sure those are followed during reassembly. You can also check out this video for a more in depth description of how the aperture mechanism is supposed to work. It might point you towards a more specific area.

https://www.youtube.com/watch?v=4V3x1cm-...

Sam Gustafson -

Beat Of Camera Repair Book

Patna - 답글

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