Service Manual

Canon NEW F-1 Service manual
Page 27
Adjustment Notes
11. Mechanical Shutter
11.1 Curtain Travel Time
1) Standard: 7.5±0.2ms (1/1000)(34mm slit spacing).
2) Adjustment: Spring Drum Gear
11.2 Shutter Speed (Exposure Time)
1) Adjust at 1/250 using the 2nd Curtain Release Lever (Seesaw Lever) Turning
the seesaw eccentric CW increases shutter speed.
2) Adjust 1/2000 with the 2
nd
curtain cam follower.
3) Adjust repeating steps 1 and 2 until the best balance of all
speeds is obtained.
4) Shutter Accuracy (measured in EV) Faster
1/2000, 1/1000: ±0.4EV
1/500 - 8 sec : ±0.2EV
12. Meter Position Adjustment
12.1 Connect a 10kohm variable resistor and microammeter in
series to the + side of the power supply set to about 2V.
Adjust the resistor for a current flow of 459uA through the
meter.
12.2 Adjust the meter housing position so that the meter needle
is centered on the "8" ±0.05mm.
12.3 Adjust the current and check the following positions:
12.4 Bond the meter housing to the die casting with black diabond. (Do not leave any
strings of bond.)
13. Battery Check and Low voltage Interlock
1
13.1 Reduce the power supply voltage until the top of the
meter needle is about 0.1mm below the bottom of the
battery check index. At this point check that the
applied voltage is from 3.0 to 3.7 volts.
13.2 Check that the low voltage interlock activates at 3.2 volts.
Note: 1. Low voltage interlock is the voltage where shutter release is prevented by the
cameras program.