Section IV. TROUBLESHOOTING
stated is followed by a list of probable causes of the trouble.
3-7. Use of Troubleshooting Section
The possible remedy recommended is described opposite the
This section provides information useful in diagnosing and
correcting unsatisfactory operation or failure of the copying
camera or any of its components. Each trouble sympton
Table 3-2. Troubleshooting
1. Vacuum back fails to hold film
a. Improper selection of vacuum back
a. Measure size of film and move valve
handle to a position best suited to
hold film of vacuum back.
b. Opening in vacuum flexible hose.
b. If opening is small make temporary
repair with electrical tape. Notify
proper authority for permanent
2. Copyboard fails to hold copy
Copyboard suction not directed
Measure size of copy and turn
operating knob to correct position.
3. Arc lamps flicker.
a. Drafty conditions around operating
a. Eliminate all drafts around working
b. Gap between carbons too great to
provide constant lighting.
4. Image distortion.
a. Thick copy.
a. If copy has appreciable thickness, its
thickness must be added to the copy-
board counter readings in units of
1 / 100 inch.
b. Copy not placed on copyboard
b. Remove copy and remount on
copyboard, smoothing out wrinkles
c. Lens not positioned.
c. Check the lensboard counter
readings. Determine if the lens is
screwed in the lens plate.
Section V. MAINTENANCE OF VACUUM TURBO-COMPRESSOR ASSEMBLY
3-9. Maintenance and Adjustment
The vacuum for the operation of the vacuum back and the
The mountings of the turbo-compressor should be inspected
copyboard is provided by two separate but identical vacuum
for loose or worn fittings, and the turbo-compressor inspected
turbo-compressors. The compressors are located at the
for suction. If there are any discrepancies, they should be
extreme copyboard end of the camera, and are mounted
reported to the proper authority.
separately. Each turbo-compressor is mounted on four
vibration mounts bolted to the camera skid (para 1-3 h).
Section VI. MAINTENANCE OF LENS ASSEMBLY
counterclockwise direction to unlock the lens (5) from the
3-10. Lens, 19 Inch
inner lensboard frame (4).
19 inch lens (1, fig. 2-10)
is a Goerz
apochromat Artar lens equipped with an attached mounting
(2) Release the lens mounting plate and the lens
plate (4) and a lens cap (3). The diaphragm opening control
from the slots of the inner lensboard frame.
(5), integral with the lens is mounted on the lens barrel. A
c. Cleaning and Inspection. Always keep lens covered
special lens box (2) is provided to store the lens when it is not
when not in use. Avoid touching lens surfaces. Clean only if
mounted on the camera.
accumulated dust or accidental fingerprints necessitate it. To
clean, first dust with a clean camel's hair brush. If markings
mounting plate (2), and rotate 15 degrees in a