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  TM 11-6730-235-35
3-4. Troubleshooting Chart
Checks and corrective
Item
Probable cause
Trouble symptom
actions
NO.
a. Defective pinion gear.
Focusing arm holster does not
1
move up and down smoothly
sembly to higher category of main-
when focus knobs are tightened.
tenance.
b. Defective rack.
sembly to higher category of main-
tenance.
c. Bent member of arm and post
assembly.
sembly to higher category of main-
tenance.
a. Defective interlock switch S1.
Power is not available at con-
2
and place ON-OFF switch S2 in on
venience outlet J1.
position. If lamp lights, replace inter-
lock switch S1 (para 3-16a through e).
b. Perform a above. If trouble persists,
b. Interlock arm not closing in-
check action of interlock arm when
terlock switch S1.
top plate assembly is lowered to closed
position. If arm is defective, replace
case assembly (paras 3-8 and 3-9) and
refer to higher category of mainte-
nance.
c. Defective convenience outlet
J1.
a. Use multimeter to measure ac voltage
a. Defective blower motor B1.
Blower motor does not operate
3
at terminals of blower motor B1 when
when ON-OFF switch is placed
ON-OFF switch S2 is in on position. If
in on position.
line voltage is measured, blower motor
B1 is defective. Replace blower motor
and wiring harness assembly (par
3-16d, f, g, and of through ai).
b. Perform a above. If line voltage is not
b. Defective ON-OFF switch S2
measured at blower B1 terminals, con-
or loose electrical connection.
nect jumper wire between ON-OFF
switch S2 terminals connected to gray
leads. If blower motor B1 operates,
ON-OFF switch S2 is defective. Re-
place ON-OFF switch S2 (para 3-16f
h, and i). If blower motor B1 does no,
operate, tighten connections made by
both electrical caps.
a. Defective thermal switch S3.
Blower motor does not continue
4
x, and y).
operating after ON-OFF switch
is placed in off position when
projection lamp is still hot.
5
a. Defective spring lock button.
Spring lock button does not se-
3-9) and refer to higher category of
cure top plate assembly.
maintenance.
b. Top plate assembly bent,
and 3-10) and refer to higher category
of maintenance.
6
a. Defective lens head assembly.
Lens head assembly does not
and 3-12) and refer to higher category
pivot properly.
of maintenance.
7
a. Lens head assembly out of
Projected image does not center
alignment.
on projection surface with im-
age source centered on stage
glass.
3-3
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