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  TM 11-6730-235-12
(9) Lower the top plate assembly on the top lip of
3-8.
Operator Troubleshooting Chart
the case assembly.
The troubleshooting chart given below is based primarily
CAUTION
on trouble symptoms that may be observed while making
the operational checks in the operator's preventive
If the spring lock button is not engaged, the top
maintenance checks and services charts (pars 3-5 and
plate assembly can swing open during
3-6). Symptoms of troubles that occur during normal
movement of the projector, breaking the stage
operation of a defective projector are also included. In
glass.
the Checks and corrective actions column, paragraph
references are to procedures that are too lengthy or
(10) Press the top plate assembly down with enough
involved to include in the char. When no entry is made
force to engage the spring latch button.
in this column, refer the projector to a higher category of
(11) To make sure that the top plate assembly is
maintenance.
actually locked by the spring latch button, try to lift the top
plate assembly.
Item
No.
Trouble symptom
Probable trouble
Checks and corrective actions
1
Spots that are not on transparencies
a. Dirty lenses..............................
a. Clean lenses (par 3-7a).
appear on projected image.
b. Dirty fresnel lens or stage glass
b. Clean fresnel lens, stage
glass, or both (pars 3-7).
2
Focusing arm holster do not movea.
Loose focus knob(s).
up and down smoothly.
b. Defective arm and post assembly.
Power is not available at projector
Defective electrical circuit.
convenience outlet.
4
Projection lamp do not light when
a. Line cord plug not secure in power
a. Secure line cord plug.
on-off switch is in on position.
source convenience outlet.
b. Defective projection lamp.
c. Defective electrical circuit.
5
Blower motor always stops operating
Defective thermal switch.
when on-off switch is placed in off
position.
6
Blower motor doe not operate when
a. Defective blower motor.
b. Defective on-off switch.
on-off switch is in on position.
7
Spring lock button does not secure top a. Defective spring lock button.
b. Top plate assembly bent.
plate assembly.
8
Lens head assembly doe not pivotDefective lens head assembly.
properly.
3-3
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