Service Manual

Canon NEW F-1 Service manual
Page 24
Assembly and Adjustment Notes
2.2. 1
st
Curtain Brake Adjustment
From the maximum curtain travel position, wind, release the shutter with the
seesaw lever at "B", and check the difference in the position where the curtain
stops and the maximum curtain travel position. It should be no more than half-
a-tooth on the master gear.
1) To increase brake torque, turn the nut CW, but don't overtighten it. When you
reach the point where it starts to get tight, back off 90°.
2) To veaken torque, turn the nut CCW, but don't turn it too far. It should not be high
enough to touch the cam follower at the maximum follower play.
3) If the adjustment cannot be made with the nut, three different diameters
(strengths) of the coil spring are available (0.6, 0.65 and 0.7mm dia.).
4) After adjustment apply diabond to the nut. Do not use enough to increase the
height of the nut.
3. 2nd Curtain Brake
3.1 Adjustment
1) Standard: 0 to 0.5 teeth (master gear) Check as explained in 2.2 above.
The nut must not exceed the height of the shutter speed selector base.
2) Other adjustments are identical to the 1st curtain brake adjustment.
3.2 Brake Torque Check (Reference)
Measure the tension at the ratchet pawl as indicated.
1st Curatin Brake: About 2nd Curtain Brake
800g (with return spring disengaged)