Pentax Super Program Mirror Box Mechanism Service

Remove the rubber decorative cap. It is attached with contact cement underneath. Isopropyl Alcohol may be used to soften the adhesive.

Unscrew the lock nut using a spanner wrench. The lock nut is reverse threaded.

Lift off the advance lever.

Remove the spring washer.

Remove one shim washer.

Set the mode dial to the 'L' position.

Use a spanner wrench to unscrew the dial lock nut.

Lift off the mode dial.

Place a rigid object in the fork.

Unscrew the rewind lever.

Use a spanner wrench to remove the lock nut.

Lift off the exposure compensation dial.

Remove two screws on either side of the eye piece.

Remove two screws on either side of the lens mount.

Remove one screw by the exposure compensation dial.

Use a spanner wrench to remove the lock nut under the advance lever.

Lift off the top cover slowly. It is still attached by one wire.

Unsolder one gray flash sync wire.

Remove three M1.7 x 3 mm screws.

Remove bottom cover.

Use a nickel or other large coin to remove the hand grip.

Drip isopropyl alcohol along the edge of the leatherette to soften the adhesive.

Use a dull scraper to lift one corner and pull off the panel.

Repeat on the rewind side of the camera.

Remove one M1.7 x 4.5 mm screw.

Remove one slotted screw.

Use isopropyl alcohol to soften the adhesive under the flex PCB.

Gently lift the PCB until it is free from the camera body.

Unsolder one red wire.

Unsolder one light blue wire.

Unsolder one orange wire.

Unsolder one purple wire.

Remove one M1.7 x 4.5 mm screw.

Remove one M1.7 x 5 mm screw.

Remove one countersunk M1.7 x 5.5 mm screw.

Lift the contact terminal free from its seat.

Remove the tripod mount.

Remove one slotted screw.

Remove one M1.7 x 4 mm screw.

Loosen one slotted screw (this will remain connected to the assembly).

Lift the ISO resistor assembly off the rewind post. It is still attached by a flex PCB.

Remove one M1.7 x 2.5 mm screw. It is only accessible when the mode dial is in the 'L' position.

Remove one crosshead screw.

Lift the LCD out of the way. It is still attached by a flex PCB.

Remove one M1.7 x 2.5 mm screw.

Remove one slotted screw.

Unsolder one gray wire.

Unsolder one red wire.

Unsolder one brown wire.

Unsolder one white wire.

Remove four M1.9 x 5 mm screws.

Remove two M1.7 x 2.5 mm screws.

Remove one M1.7 x 3.5 mm screw under the bottom plate.

Wind the shutter

Make sure the mode dial unit and ISO selector unit are free from their mounting points.

Wiggle the mirror box and front board free.

Watch for wire snags as you pull it free.

Check for loose shim washers on the front board and note their position.

Shutter should be in the charged state.

Mirror box should be in released state.

Pay close attention to wire routing during install.

To test the actuation of the mirror and shutter, wind the camera, then insert a tool into this slot and push the release lever to the left.

Unsolder one orange wire.

Unsolder one blue wire.

Unsolder one pink wire.

Unsolder two purple wires.

Unsolder one green wire.

Unsolder two yellow wires for the aperture resistor.

Unsolder one gray wire for flash sync.

Unsolder one red wire for metering cell power.

Unsolder one black wire for metering cell power.

Unsolder one gray wire for flash sync.

Unsolder one pink wire for flash sync.

Remove two M1.4 x 2 mm screws.

Use a spudger to gently pry off the connector plate.

Remove the silicone insulating pad.

Remove two M1.4 x 1.6 mm screws.

Remove one M1.7 x 4.5 mm screw.

Loosen one M1.7 x 4.5 mm screw but leave it in place.

Remove two M1.7 x 1.6 mm screws.

Remove the mirror governor.

Remove one plastic bushing.

Gently lift away the PCB from the mirror box.

The TTL flash metering needs to be unseated from the housing to free the PCB for removal.

Lift flex PCB off of mounting posts.

Remove silicone insulator pad.

Remove two M2 x 3 mm screws.

Remove one M1.7 x 3 mm screw.

Charge and release the mirror so it is in the taking position (up against the focusing screen).

Remove one M1.7 x 3 mm screw.

Lift mirror box away from front lens board.

Check the coupling points for the aperture control, depth of field preview and self-time when reassembling the mirror box.

Remove one screw.

Remove one screw.

Remove one shim washer.

Note the rubber bumper on the pivot post. This should be removed and cleaned before reassembly.

Remove one screw.

Remove the bias spring.

Remove the brass bushing.

Unhook and remove the coil spring. It may be tacked in place with contact cement.

Remove one screw.

Remove the depth of field preview lever.

Remove the bushing.

Use a spanner wrench or u-bit to remove two nuts.

Lift off auto-aperture control lever.

Lift off mirror flip-up lever.

Remove shim washer.

Remove plastic bushing.

Remove aperture stop-down lever.

Remove shim washer.

Installation Notes: Ensure the lever foot is placed properly between the mirror flip-up spring and the mirror return lever during reassembly.

Remove two old rubber bumpers.

Clean all pivots with isopropyl alcohol.

Clean all removed components with isopropyl alcohol.

The mirror mechanism does not need lubrication to operate properly. Most moving interfaces run dry.

High friction latching points can be lubricated with a heavy moly grease to reduce wear.

Replacement rubber dampers are optional. Silicone tubing cut to length is good source.