Section VI. MAINTENANCE OF CONTROLS AND INSTRUMENTS
The various controls and instruments of the camera become
defective because of constant handling during operation,
and general breakage of parts.
New or reconditioned
replacement parts must be exact in physical appearance and
function to maintain maximum performance of the equipment.
Under no circumstance should substitutions of components
be made unless authority comes from the proper source.
Replacement of controls and instruments involving wiring
must be handled with care to avoid strain on wire and
4-11. Lensboard and Copyboard Positioning Counters
a. Darkroom Side.
Note. Prior to any removal procedures, the
distance of the lensboard and copyboard, as shown on the
counters, must be recorded so that new counters may be
calibrated to identical reading. Failure to record the distances
(b) Remove four screws to release the
cover plate (3, fig. 4-1) from the counters (6 and 7).
Disconnect counter safety light wires from terminals to free
(c) Loosen two setscrews (4) to release the
counter from the counter drive.
Figure 4-1. Positioning counters, installed,
(d) Remove four mounting screws (5), and
remove the counter from its base.
Lensboard and Copyboard Fine Adjustment
(a) Set the new counter to the distance
. Turn handwheel
6, fig. 4-2),
(b) Install counter on the base, being
necessary, to make pin accessible. Tap pin through shaft
careful not to disturb digits, and tighten the two setscrews (4).
extension and handwheel. Slide the handwheel off the
mounting screws (5).
b. Installation. Install the handwheel on the extension,
aligning pin holes. Insert pin into hole and tap into place.
(d) Attach loose wire leads to terminals.
(e) Replace cover plate (3) with four