Olympus OM-1 Manual page 10

Major Check
Relative Function
Checking Method or
Points of Special Attention
8. Focusing
Screen
Shutter
Dial
(CA8878)
2)
-----х |
With -CAB912 (F-key) made effective, `
the focusing screen should accurately
be located at the position of focus.
САВ912 should be released without
an extreme friction and the mounting
block of the focusing screen should
be lowered enabling the Screen to
be easily removed,
CA8912 should accurate lock the
screen frame with clicks.
Should smoothly operate with accuracy|
(without an extreme friction, uneven-
ness and squeaks). The only noise
is that of the доуетег.
Should be accurately click-stopped.
Discrepancy between the center of
the index and that of the letter,
By ears, the following shutter speeds
should give a clear difference in
timing properly (without an extreme
disorder).
1/1000, 1/60, 1/15, 1/4, 1/1, В.
10. Mirror-up
Knob
(CA8917)
The MU knob should move smoothly
without extreme frictions, uneven-
ness and/or stoppage, and clicks
should be felt.
By operation of the MU knob, the
mirror should be raised and returned
to the original position accurately.