8
3. Mirror 300.21-53 replacement.
a) Remove the back 350.02 (EXA) or 370.20 (EXA I/63).
b) Place the camera front uppermost.
c) Remove the four lens-mount fixing screws M1.7 x 6.5 DIN 91 (EXA) or M1.7 x 6 DIN 63
(EXA I/63). Remove the lens-mount (noting any shims 300.21-52/1).
d) Guide the front edge of the shutter flap to the level of the gap in the round opening in the
outer casing. Bend outwards both the retaining tabs (left and right) for the mirror.
e) Slide the mirror out.
f) Insert the new mirror and bend the retaining tabs back inwards.
g) Replace the lens mount.
h) Check/adjust the lens mount to film path distance.
See under assembly of camera B4.
i) Check/adjust the mirror position.
See under assembly of camera B5.
4. Frame-counter failure.
EXA
a) Open right side, described in Disassembly of Camera A.2.
b) Cock and fire the shutter, observing the spring for the ratchet-lever 350.07-17.
c) Bend the spring for the ratchet-lever, near the mounting of the frame-counter disc 350.07-
21, so it engages with the teeth.
d) Close the right side. As in Disassembly of Camera A.2, but in reverse order.
e) Check the operation.
