Olympus OM-1 Repair Manual page 41

B-20
(11) Mirror-Up Mechanism:
When a short focus lens is used, the lens will hit the mirror.
Therefore, it is necessary to lift up the mirror and thus the mirror-up
mechanism is provided to meet the requirement.
1. When 8719 is turned, 8918 moves in the arrowed direction.
2. 8486 presses 8456, thus lifting the mirror.
3. Simultaneously with 8456 movement, 8441 pivoted at 8442 rotates
counter-clockwise. The mirror is up. (Status (6) of Fig. B in
the Repair Data B-17)
(12) Synchronizing Mechanism for the Exposure Meter:
When the shutter dial is turned, this rotates 8880 directly connected
thereto. Then the string (8944) adhered to the outer perimeter of 8880
will move to rotate 8980 of the meter using the Moving pulley as a
media. Three pulleys (8883) in the route are for converting the string
(8944) angle. At this time, the string is given tension by the spring
(8999) on the meter side.
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