TM 5-3610-220-14
Table 4-1. Preventive Maintenance Checks and Services-Continued
Organizational Maintenance Category
Monthly Schedule
Sequence
Item to be
Paragraph
number
inspected
Procedure
reference
13.
Copyboard
Check that all mounting bolts, nuts, and lockwashers of
the copyboard are secure. Inspect the operating knob
for proper function during operation. Check the
vacuum conditions of the copyboard with sample copy
for proper suction. Tighten all loose connections. If
operating knob does not control vacuum to hold copy
of specified sizes, report condition to the proper
authority.
14.
Transparency holder
Check that all mounting bolts, nuts, and lockwashers of
the transparency holder are secure to the tube and axle
assembly. Inspect the diverter knob during operation
to determine if the valve plate is functioning properly
to permit suction through transparency holder.
Check
the light box assembly for burned-out fluorescent
tubes and starters, and defective ballasts. Tighten all
loose connections. Defective valve plate must be
reported to the proper authority.
15.
Copyboard Carriage
Check that all bolts, lockwashers, and nuts are firm and
secure. Inspect for worn wipers and loose wiper
2-1. f. (3)
guards. Check that bolts, holding the carriage gibs, are
tight to prevent misalignment of copyboard, lens-
board, and focusing glass. Tighten all loose con-
nections. Replace worn wipers with new, oiled wipers;
tighten the wiper guards. Worn carriage gibs causing
faulty reproduction must be reported to the proper
authority.
16.
Vacuum back hinge assembly
See that locking knobs are tight against the bearing
thrust hinges to hold the vacuum back in operating
position. Operate the valve handle to check if the
vacuum valve is working properly. Tighten loose
locking knobs and check for proper position of
vacuum back. If the handle valve does not operate
properly to hold negatives on surface, report condition
to the proper authority.
17.
Focusing glass
Check the focusing glass clips for secure mounting.
Inspect and operate the oscillating knob for proper
function of pivoting motion. Check that focusing glass
remains in open position without slack. Check for
damaged or broken glass or cleanness. Tighten screws
of focusing glass clips if loose; replace missing screws.
Repair and replace the oscillating knob if not
operating properly. Clean the focusing glass. If
focusing glass does not remain in open position, report
condition to the proper authority.
18.
Bellows
Check the bellows end frames for loose or missing bolts,
and secure mounting to the lensboard and camera
back. Inspect the bellows for cracking, tears, and dry
rot. Check the tube support assembly supporting the
bellows for satisfactory operation and proper con-
nection. Tighten all loose connections and replace
missing bolts and nuts. Replace the bellows if
cracking, tears, and dry rot are evident. Repair all
minor damages to the rubberized fabric. Replace
damaged pins, tube, or roller carriers of the tube
support assembly.
4-3
