Pentax Super Program Front Block Functional Check

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简介

This guide shows how to check the major functions of the front block of the camera. The best time to do this are right after the front block has been separated from the chassis during disassembly, or right before it is installed during reassembly. It serves as a good intermediate checkpoint to see if mechanisms have been reassembled correctly and that all electrical connections have been properly made. It's also useful in troubleshooting a malfunctioning camera. Isolating parts of the camera and checking them individually can help narrow the search for the cause of failure.

With the camera in this state, you will be able to the check the mirror release mechanism, the shutter release switch, the self-timer, LCD Displays and the responsiveness of the light meter.

步骤 1 Prepare the front block

Pentax Super Program Front Block Functional Check, Prepare the front block: 步骤 1 中的图像 1，3

Pentax Super Program Front Block Functional Check, Prepare the front block: 步骤 1 中的图像 2，3

Pentax Super Program Front Block Functional Check, Prepare the front block: 步骤 1 中的图像 3，3

Connect a lead wire to the main flex PCB to supply battery power (early production).
Connect a lead wire to the main flex PCB to supply battery power (late production).
Make a ground connection to the body of the camera.

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步骤 2 Prepare the mode dial

Pentax Super Program Front Block Functional Check, Prepare the mode dial: 步骤 2 中的图像 1，2

Pentax Super Program Front Block Functional Check, Prepare the mode dial: 步骤 2 中的图像 2，2

Ground the mode dial plate to the chassis of the front block.
Move the mode dial to the 'M' position.
Be careful not to let the ball bearing escape when passing through 'Auto' mode (the larger hole).

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步骤 3 Check power to the front block

Pentax Super Program Front Block Functional Check, Check power to the front block: 步骤 3 中的图像 1，2

Pentax Super Program Front Block Functional Check, Check power to the front block: 步骤 3 中的图像 2，2

Use a source of 2.8 V to power the front block, the lowest battery voltage that the camera should operate at.
If an external power supply is not available, use fresh batteries to supply power.
Check the voltage at these locations to make sure that power is getting to all of the components.

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步骤 4 Check the main shutter release

Pentax Super Program Front Block Functional Check, Check the main shutter release: 步骤 4 中的图像 1，3

Pentax Super Program Front Block Functional Check, Check the main shutter release: 步骤 4 中的图像 2，3

Pentax Super Program Front Block Functional Check, Check the main shutter release: 步骤 4 中的图像 3，3

Charge the mirror mechanism.
Press the shutter button. The mirror should release and flip up into the taking position.
Push the mirror return latch to flip the mirror down into the viewing position (the shutter would trigger this mechanism when the camera is fully assembled).

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步骤 5 Check the self-timer

Pentax Super Program Front Block Functional Check, Check the self-timer: 步骤 5 中的图像 1，2

Pentax Super Program Front Block Functional Check, Check the self-timer: 步骤 5 中的图像 2，2

Pull out the tab on the self-timer switch.
Press the shutter release button.
The self-timer led should blink and the buzzer should sound.
After ten seconds, the mirror should flip up.

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步骤 6 Check the motor drive shutter release

Pentax Super Program Front Block Functional Check, Check the motor drive shutter release: 步骤 6 中的图像 1，2

Pentax Super Program Front Block Functional Check, Check the motor drive shutter release: 步骤 6 中的图像 2，2

Ground this pad to release the shutter (early production).
Ground this pad to release the shutter (late production).
This is the signal that the accessory motor drive uses to fire the shutter. It's also a useful alternative if you think there is an issue with the main shutter release.

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步骤 7 Check meter response

Mount a lens on the front block. Set the aperture ring to 'A'.
Point the front block at scenes with varying brightness. Check that the aperture value in the viewfinder display changes accordingly.

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