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5. Mirror 370.01-33 replacement.
a) Take off the back 370.10, and release the shutter.
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 U6, and take off
the flange (be careful with the shims 300.21-52/1, if fitted).
d) Cock the shutter partly, until the mirror base 370.03 U13 stands at the height of the gap in
the round opening in the casing.
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 under assembly of camera B3 and B4.
i) Check/adjust the mirror position, see under assembly of camera B3 and B4.
6. Transport fails.
NB. Only use a faultless cartridge! When spools for daylight loading are used, these may only
be inserted in cassette cases of the same manufacturer. With film transport from cassette to
cassette, special attention must be paid to the wind-on cassette. If necessary the sliding surface
of the spool may be lightly rubbed with paraffin. The spool must slide easily into the case and
must not be at an angle.
All these points being in order, the checking of the camera can begin.
Checking the friction-bush 370.03 U11:
a) Remove the rear cover 370.10 and the take-up spool 370.09.
b) Hold the friction bush with the left hand, and at the same time slowly cock the shutter. The
friction bush must give uniform resistance and not scrape, catch or run very much out of
true.
c) A faulty friction bush is to be removed, cleaned and re-lubricated.
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