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Pentax ZX-5n Shutter Unit Replacement

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  1. Pentax ZX-5n Shutter Unit Replacement, Remove back cover: crwdns2935265:01crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • Push down on the screw to depress the spring loaded hinge and release the door.

  2. Pentax ZX-5n Shutter Unit Replacement, Remove bottom cover: crwdns2935265:02crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • 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 Shutter Unit Replacement, Remove left front cover: crwdns2935265:03crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • 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 Shutter Unit Replacement, Remove front cover: crwdns2935265:04crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Pentax ZX-5n Shutter Unit Replacement, Remove front cover: crwdns2935265:04crwdnd2935265:02crwdnd2935265:02crwdne2935265:0
    • 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 Shutter Unit Replacement, Remove right front cover: crwdns2935265:05crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • Remove two 3.9 mm #00 screws.

  6. Pentax ZX-5n Shutter Unit Replacement, Remove eye cup: crwdns2935265:06crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • Slide the eye cup up and off to access the screws underneath.

  7. Pentax ZX-5n Shutter Unit Replacement, Unscrew top cover: crwdns2935265:07crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Pentax ZX-5n Shutter Unit Replacement, Unscrew top cover: crwdns2935265:07crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Pentax ZX-5n Shutter Unit Replacement, Unscrew top cover: crwdns2935265:07crwdnd2935265:03crwdnd2935265:03crwdne2935265:0
    • 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 Shutter Unit Replacement, Lift top cover: crwdns2935265:08crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • Lift the cover so it is just free of the body. It is still attached by several wires.

  9. Pentax ZX-5n Shutter Unit Replacement, Discharge flash capacitors: crwdns2935265:09crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • 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 Shutter Unit Replacement, Unsolder flash connections: crwdns2935265:010crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • Unsolder one green wire.

    • Unsolder one blue wire.

    • Unsolder one brown wire.

    • Unsolder one black wire.

  11. Pentax ZX-5n Shutter Unit Replacement, Unsolder remaining connections: crwdns2935265:011crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Pentax ZX-5n Shutter Unit Replacement, Unsolder remaining connections: crwdns2935265:011crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Pentax ZX-5n Shutter Unit Replacement, Unsolder remaining connections: crwdns2935265:011crwdnd2935265:03crwdnd2935265:03crwdne2935265:0
    • 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 Shutter Unit Replacement, De-solder battery connections: crwdns2935265:012crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • 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 Shutter Unit Replacement, De-solder flex posts: crwdns2935265:013crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • 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 Shutter Unit Replacement, De-solder flex connections: crwdns2935265:014crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • 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 Shutter Unit Replacement, Unscrew flex circuit: crwdns2935265:015crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • Remove one 4.3 mm #00 screw.

  16. Pentax ZX-5n Shutter Unit Replacement, Lift the flex circuit: crwdns2935265:016crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Pentax ZX-5n Shutter Unit Replacement, Lift the flex circuit: crwdns2935265:016crwdnd2935265:02crwdnd2935265:02crwdne2935265:0
    • 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 Shutter Unit Replacement, Unscrew flash PCB: crwdns2935265:017crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • 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 Shutter Unit Replacement, Remove flash PCB and capacitors: crwdns2935265:018crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Pentax ZX-5n Shutter Unit Replacement, Remove flash PCB and capacitors: crwdns2935265:018crwdnd2935265:02crwdnd2935265:02crwdne2935265:0
    • 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 Shutter Unit Replacement, Prepare bottom plate: crwdns2935265:019crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Pentax ZX-5n Shutter Unit Replacement, Prepare bottom plate: crwdns2935265:019crwdnd2935265:02crwdnd2935265:02crwdne2935265:0
    • 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 Shutter Unit Replacement, Remove bottom plate: crwdns2935265:020crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Pentax ZX-5n Shutter Unit Replacement, Remove bottom plate: crwdns2935265:020crwdnd2935265:02crwdnd2935265:02crwdne2935265:0
    • 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 Shutter Unit Replacement, Remove transport gears: crwdns2935265:021crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Pentax ZX-5n Shutter Unit Replacement, Remove transport gears: crwdns2935265:021crwdnd2935265:02crwdnd2935265:02crwdne2935265:0
    • It's best to remove these parts now so they don't fall out later on in the repair.

  22. Pentax ZX-5n Shutter Unit Replacement, Detach DOF preview switch: crwdns2935265:022crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • Remove one 3.8 mm #00 screw.

  23. Pentax ZX-5n Shutter Unit Replacement, De-solder shutter control flex: crwdns2935265:023crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Pentax ZX-5n Shutter Unit Replacement, De-solder shutter control flex: crwdns2935265:023crwdnd2935265:02crwdnd2935265:02crwdne2935265:0
    • 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 Shutter Unit Replacement, Remove eye piece assembly: crwdns2935265:024crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • Remove two 5.3 mm #0 screws.

  25. Pentax ZX-5n Shutter Unit Replacement, Unscrew front housing block: crwdns2935265:025crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Pentax ZX-5n Shutter Unit Replacement, Unscrew front housing block: crwdns2935265:025crwdnd2935265:02crwdnd2935265:02crwdne2935265:0
    • 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 Shutter Unit Replacement, Lift front housing block: crwdns2935265:026crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • 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 Shutter Unit Replacement, Check for shims: crwdns2935265:027crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • There may be shims at the mounting points of the front housing block.

    • Note the positions and remove if loose.

  28. Pentax ZX-5n Shutter Unit Replacement, Remove panorama switch: crwdns2935265:028crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Pentax ZX-5n Shutter Unit Replacement, Remove panorama switch: crwdns2935265:028crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Pentax ZX-5n Shutter Unit Replacement, Remove panorama switch: crwdns2935265:028crwdnd2935265:03crwdnd2935265:03crwdne2935265:0
    • Remove one X mm #00 screw.

    • Remove panorama switch contact.

    • Remove one X mm #00 screw.

    • Pull panorama switch apart and remove both pieces.

  29. Pentax ZX-5n Shutter Unit Replacement, Remove shutter unit: crwdns2935265:029crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Pentax ZX-5n Shutter Unit Replacement, Remove shutter unit: crwdns2935265:029crwdnd2935265:02crwdnd2935265:02crwdne2935265:0
    • Remove one X mm #00 screw.

    • Remove two X mm #00 screw.

    • Remove shutter unit.

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

Sam Gustafson

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