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Pentax ZX-5n Flash Capacitor Unit

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  1. Pentax ZX-5n Flash Capacitor Unit, 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 Flash Capacitor Unit, 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 Flash Capacitor Unit, 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 Flash Capacitor Unit, Remove front cover: crwdns2935265:04crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Pentax ZX-5n Flash Capacitor Unit, 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 Flash Capacitor Unit, Remove right front cover: crwdns2935265:05crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • Remove two 3.9 mm #00 screws.

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

  7. Pentax ZX-5n Flash Capacitor Unit, Unscrew top cover: crwdns2935265:07crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Pentax ZX-5n Flash Capacitor Unit, Unscrew top cover: crwdns2935265:07crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Pentax ZX-5n Flash Capacitor Unit, 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 Flash Capacitor Unit, 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 Flash Capacitor Unit, 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 Flash Capacitor Unit, Release top cover: crwdns2935265:010crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • De-solder the green, blue, brown and black wires from the flash PCB.

  11. Pentax ZX-5n Flash Capacitor Unit, De-solder battery connections: crwdns2935265:011crwdnd2935265:01crwdnd2935265:03crwdne2935265:0 Pentax ZX-5n Flash Capacitor Unit, De-solder battery connections: crwdns2935265:011crwdnd2935265:02crwdnd2935265:03crwdne2935265:0 Pentax ZX-5n Flash Capacitor Unit, De-solder battery connections: crwdns2935265:011crwdnd2935265:03crwdnd2935265:03crwdne2935265:0
    • Move the top cover to the side to access the battery connections. It is still connected by a flex cable.

    • 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.

  12. Pentax ZX-5n Flash Capacitor Unit, Desolder flex cable: crwdns2935265:012crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • Desolder the flex cable connecting the top plate to the camera body.

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

    • The top cover can be completely removed at this point.

  13. Pentax ZX-5n Flash Capacitor Unit, 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 Flash Capacitor Unit, De-solder flex connections: crwdns2935265:014crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • De-solder the marked 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 Flash Capacitor Unit, Unscrew flex circuit: crwdns2935265:015crwdnd2935265:01crwdnd2935265:01crwdne2935265:0
    • Remove one 4.3 mm #00 screw.

  16. Pentax ZX-5n Flash Capacitor Unit, Lift the flex circuit: crwdns2935265:016crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Pentax ZX-5n Flash Capacitor Unit, 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 Flash Capacitor Unit, 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 Flash Capacitor Unit, Remove flash PCB and capacitors: crwdns2935265:018crwdnd2935265:01crwdnd2935265:02crwdne2935265:0 Pentax ZX-5n Flash Capacitor Unit, 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.

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

Sam Gustafson

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