Figure 3-1. Projector wiring diagram.

TM 11-6730-235-35

omitted. For each of the symptoms that has been

(1) Remove the line plug from the power

included, the probable causes have been listed with

source.

the corresponding corrective action required to

isolate, localize, and remedy the trouble. Troubles

(2) Remove the two screws that secure the

can be isolated to a defective part using the

interlock switch cover to the side of the case

troubleshooting chart in conjunction with the

assembly.

schematic diagram (fig. 2-2) and the wiring diagram

(fig. 3-1) for the projector. The physical location

(3) Connect a jumper lead between the two

of the electrical parts shown on these diagrams is

interlock switch S1 terminals to which black leads

illustrated by figure 3-5. When trouble is isolated

are connected (fig. 3-1).

to a defective electrical part, the case assembly

should be removed (para 3-8) and the applicable

(4) Connect a jumper lead between the two

steps of the case assembly disassembly procedure

interlock switch S1 terminals to which white leads

(para 3-16) should be performed, followed by the

are connected.

applicable steps of the reassembly procedure (para

3-18).

(5) Reconnect the line plug to the power

c. When troubleshooting techniques localize a

source. Power is now under the control of ON-OFF

trouble to the electrical circuits of the projector

switch S2, only.

and the isolation procedures require that additional

troubleshooting procedures be performed with

power on, special considerations are involved.

Troubleshooting of the electrical circuits of the

projector require that the top plate assembly be

opened. Opening the top plate assembly opens the

contacts of interlock switch S1 (para 2.3c), remov-

ing power from the projector. To apply power to

the electrical circuits in order to test them, press

the button of interlock switch S1 inward with one

finger. If this technique is not convenient, perform

the following steps to bypass the interlock switch:

WARNING

Be careful when performing any work on

the interior of the case assembly of the

projector. Voltages that can be dangerous

to life exist within these circuits.

Figure 3-1. Projector wiring diagram.

3-2