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3. Shutter times checking and adjusting.
Dismantle camera, as under Disassembly of Camera A. 1. to A. 3.
For repair procedure, see Repair Manual for EXA II C. 4.
a) to g) [should this read “a) to b)” ?]
At the following points deviations arise in the case of the EXA 500:
`c) Check the shutter with the shutter-speed measuring equipment. Fundamentally it is only
three basic times which are measured, adjusted, and ensured [zwar?], 1/500 s, 1/60 s, and
1/2 s. The other times are obtained through the cam-plate. The measurement at 1/500 s is
carried out at three points – the beginning, the centre, and the end – in the direction of
movement of the shutter-curtains in the film window 2mm away from the upper and/or
lower film-window edge. The shutter must operate uniformly, i.e. the three measurements
must give approximately the same values (see table for exposure times of EXA
II/IIa/IIb/500).
This is achieved as described in the following points, d) to g).
d) Spring-spindles 370.03 U7 must have the previously specified tension.
e) 1/60 s adjustment Check shutter-time.
Example 1: 1/60 too light. Slacken the spring for the delay segment 370.06-40.
Example 2: 1/60 too dark. Tighten the spring for the delay segment.
f) 1/500 s adjustment Check shutter-time.
Example 3: 1/500 s too light.. Reduce the spring-spindle tension for the first curtain.
Example 4: 1/500 s too dark. Increase the spring-spindle tension for the first curtain.
g) 1/2s and the other slow times (1/30 s to 1/2 s) are basically only adjusted with the delay
mechanism by means of a change/modification of the pallet lever.
4. Mirror 370.51-2 replacement.
a) Take off the back, and remove the spool.
b) Lay the camera front side uppermost.
c) Remove the 4 fixing screws M 1.7 x 5 DIN 63 for the lens flange 300.21 U 6, and take off
the flange (be careful with the shims 300.21-52/1, if fitted).
d) Move the mirror base 370.54 U 1 to the height of the gap in the round hole in the outer shell.
e) Bend outwards both the retaining tabs at the front of the mirror base (left and right) for the
mirror. Slide the mirror out.
f) Insert the new mirror and bend the retaining tabs back inwards.
g) Replace the lens mount (paying attention to any shims fitted).
h) Check/adjust the lens mount to film path distance. See Repair Manual for EXA II B. 3.
i) Check/adjust the mirror position. As under Assembly of Camera B. 4.
5. Transport fails.
See Repair Manual for EXA I C. 6.
6. Frame-counter adjusting.
See Repair Manual for EXA IIa C. 6.
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