Pentax ZX-5n Shutter Unit Replacement

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

Remove six 5.3 mm #00 screws.

Remove one 3.4 mm #00 screw.

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.

Remove one 3.4 mm #00 screw.

Remove two 5.3 mm #00 screw.

Remove two 3.9 mm #00 screws.

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

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.

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

Use a 1kΩ-10kΩ resistor to discharge the capacitor. Place the resistor between the blue wire, exposed in the previous step, and ground.

Unsolder one green wire.

Unsolder one blue wire.

Unsolder one brown wire.

Unsolder one black wire.

Unsolder one black wire.

Pull black wire out from its routed location.

Unsolder flex connector

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.

Use a solder sucker to de-solder the four posts from the flex circuit.

Unsolder film advance motor connections.

Unsolder sprocket counter connections.

Unsolder power and ground connections.

Unsolder panorama switch connections.

Remove one 4.3 mm #00 screw.

Gently pry up the plastic carrier under the flex circuit. It may catch slightly on the battery contact tab.

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

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.

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.

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.

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.

It's best to remove these parts now so they don't fall out later on in the repair.

Remove one 3.8 mm #00 screw.

De-solder the connections.

Lift the flex off the retaining studs.

Remove two 5.3 mm #0 screws.

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.

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.

There may be shims at the mounting points of the front housing block.

Note the positions and remove if loose.

Remove one X mm #00 screw.

Remove panorama switch contact.

Remove one X mm #00 screw.

Pull panorama switch apart and remove both pieces.

Remove one X mm #00 screw.

Remove two X mm #00 screw.

Remove shutter unit.