PANEL LIGHTS DO NOT LIGHT.

TM 3-1040-279-12&P

TROUBLESHOOTING (CONT)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

7. PANEL LIGHTS DO NOT LIGHT.

Check panel lights.

Step 1.

Set POWER switch to ON.

Rotate PANEL LIGHT rheostat fully clockwise.

If panel lamps do not light, go to next step.

If some panel lamps do not light, replace defective lamps (P. 4-108).

Step 2.

Check for power to POWER switch.

Check for 28v between pin 8 of POWER switch, and chassis ground.

If 28v is present, go to next step.

If 28v is not present, check control panel wiring (P. 4-127) for open or shorted condition.

Check POWER switch.

Step 3.

Check for 28v between pin 9 of POWER switch and chassis ground.

If 28v is present, check control panel wiring (P. 4-127) for open or shorted condition.

If 28v is not present, replace POWER switch (P. 4-110).

8. SMOKE TEMPERATURE INDICATOR DOES NOT WORK.

Check thermalcouple continuity.

Step 1.

Disconnect cable assembly from connector 5J2 on equipment container.

Check continuity between pins A and B of cable assembly.

If continuity is present, reconnect cable assembly and go to next step.

If continuity is not present, replace cable assembly W12 (P. 4-22).

Check smoke generator circuit.

Step 2.

Disconnect cable assembly from connector 5J1 at smoke generator.

Check continuity between pins L and M of connector 5J1.

If continuity was obtained, reconnect cable assembly and go to next step.

If continuity was not obtained, check smoke generator wiring (P. 4-34) for an open circuit,

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Change 3