Troubleshooting - Nikon MD-12 Instruction Manual

TROBLESHOOTING
Your MD-12 has been designed to make motor drive pho-
tography as simple and trouble-free as possible. However,
should you operate the camera incorrectly or without clearly
understanding what you are doing, minor "hitches" may
occur. If this occurs, please follow the instructions below.
If the motor drive "jams" during operation, this usually
means that the controls have either been operated incorrectly
or in the wrong sequence, and the coupling mechanism has
disengaged. Should this occur, turn the MD-12's power
switch off and make one exposure with the camera's shutter
release button, remembering, in the case of the FM (Serial
No. below 3,000,000), to switch over to manual film advance.
You may find that the motor drive did not finish advancing
the film. If so, complete the film advance using the camera's
film advance lever, then press the shutter release button. Do
not advance the film. Switch the motor drive back on and,
in the case of the FM (Serial No. below 3,000,000), revert to
the motor drive mode. The motor drive should advance the
film ready for the next exposure. If this does not clear the
malfunction or you are unable to move the film advance le-
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ver at all, do not try to force the controls. Turn the motor
drive off once more and simply remove the motor drive from
the camera. This will clear the tension in the film advance
mechanism, allowing you to advance or finish advancing the
film and make one exposure, again do not advance the film.
Reattach the motor drive and, in the case of the FM (Serial
No. below 3,000,000), switch to motor drive operation. When
you switch the motor drive back on, the film should then
advance one frame ready for the next exposure.
Should you trigger the motor drive with the shutter speed
dial set to "B" the absence of an "exposure complete sig-
nal" may result in the camera's mirror locking up and the
shutter remaining open. To restore normal operation in the
event of this happening, merely move the shutter speed dial
away from "B."
At all times during motor drive operation, the film advance
lever should remain flush with the back of the camera. If
you move it out to its stand-off position, the motor_drive
will stop. Returning the lever to its flush position will auto-
matically start the motor drive once more.