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Pentax ZX-5n Flash Capacitor Unit

Introducción

How to remove the two flash capacitors and the PCB they are attached to. A donor part from another camera will be needed.

Qué necesitas

  1. Pentax ZX-5n Flash Capacitor Unit, Remove back cover: paso 1, imagen 1 de 1

    • Push down on the screw to depress the spring loaded hinge and release the door.

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  2. Pentax ZX-5n Flash Capacitor Unit, Remove bottom cover: paso 2, imagen 1 de 1

    • 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.

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  3. Pentax ZX-5n Flash Capacitor Unit, Remove left front cover: paso 3, imagen 1 de 1

    • 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.

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  4. Pentax ZX-5n Flash Capacitor Unit, Remove front cover: paso 4, imagen 1 de 2 Pentax ZX-5n Flash Capacitor Unit, Remove front cover: paso 4, imagen 2 de 2

    • 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.

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  5. Pentax ZX-5n Flash Capacitor Unit, Remove right front cover: paso 5, imagen 1 de 1

    • Remove two 3.9 mm #00 screws.

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  6. Pentax ZX-5n Flash Capacitor Unit, Remove eye cup: paso 6, imagen 1 de 1

    • Slide the eye cup up and off to access the screws underneath.

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  8. Pentax ZX-5n Flash Capacitor Unit, Unscrew top cover: paso 7, imagen 1 de 3 Pentax ZX-5n Flash Capacitor Unit, Unscrew top cover: paso 7, imagen 2 de 3 Pentax ZX-5n Flash Capacitor Unit, Unscrew top cover: paso 7, imagen 3 de 3

    • 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.

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  9. Pentax ZX-5n Flash Capacitor Unit, Lift top cover: paso 8, imagen 1 de 1

    • Lift the cover so it is just free of the body. It is still attached by several wires.

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  10. Pentax ZX-5n Flash Capacitor Unit, Discharge flash capacitors: paso 9, imagen 1 de 1

    • 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.

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  11. Pentax ZX-5n Flash Capacitor Unit, Unsolder flash connections: paso 10, imagen 1 de 1

    • Unsolder one green wire.

    • Unsolder one blue wire.

    • Unsolder one brown wire.

    • Unsolder one black wire.

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  12. Pentax ZX-5n Flash Capacitor Unit, Unsolder remaining connections: paso 11, imagen 1 de 3 Pentax ZX-5n Flash Capacitor Unit, Unsolder remaining connections: paso 11, imagen 2 de 3 Pentax ZX-5n Flash Capacitor Unit, Unsolder remaining connections: paso 11, imagen 3 de 3

    • 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.

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  13. Pentax ZX-5n Flash Capacitor Unit, De-solder battery connections: paso 12, imagen 1 de 1

    • 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.

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  14. Pentax ZX-5n Flash Capacitor Unit, De-solder flex posts: paso 13, imagen 1 de 1

    • 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.

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  15. Pentax ZX-5n Flash Capacitor Unit, De-solder flex connections: paso 14, imagen 1 de 1

    • 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.

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  16. Pentax ZX-5n Flash Capacitor Unit, Unscrew flex circuit: paso 15, imagen 1 de 1

    • Remove one 4.3 mm #00 screw.

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  17. Pentax ZX-5n Flash Capacitor Unit, Lift the flex circuit: paso 16, imagen 1 de 2 Pentax ZX-5n Flash Capacitor Unit, Lift the flex circuit: paso 16, imagen 2 de 2

    • 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.

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  18. Pentax ZX-5n Flash Capacitor Unit, Unscrew flash PCB: paso 17, imagen 1 de 1

    • 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.

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  19. Pentax ZX-5n Flash Capacitor Unit, Remove flash PCB and capacitors: paso 18, imagen 1 de 2 Pentax ZX-5n Flash Capacitor Unit, Remove flash PCB and capacitors: paso 18, imagen 2 de 2

    • 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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Conclusión

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

Autor

con 1 otro colaborador

Sam Gustafson

Miembro Desde 09/01/22

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