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TM 5-4210-233-14&P-1
Table 4-2. Unit Troubleshooting - Continued
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ELECTRICAL SYSTEM - EMERGENCY MASTER CIRCUITS - Continued
2
ROTATING BEACONS (CAB ROOF) WILL NOT ROTATE
(Refer to Electrical Wiring Diagrams, Appendix H, Sheet 1 of 16.)
Step 1.
Check motor.
Replace motor (see para 4-85).
Step 2.
Check wiring to motor for continuity.
Replace wire (see para 4-9.4).
3
ROTATING BEACONS DO NOT ILLUMINATE
(Refer to Electrical Wiring Diagrams, Appendix H, Sheet 1 of 16.)
Step 1.
Check bulb.
Replace bulb (see para 4-85).
Step 2.
Check brush and collector ring assembly for good electrical contact.
Replace brush/collector assembly (see para 4-85).
Step 3.
Check wiring for continuity.
Replace wire (see para 4-9.4).
4
ROTATING BEACONS DO NOT OPERATE
(Refer to Electrical Wiring Diagrams, Appendix H, Sheet 1 of 16.)
Step 1.
Check switch.
Replace switch (see para 4-94).
Step 2.
Check "roof light" solenoid for proper operation.
Replace solenoid (see para 4-9.4).
Step 3.
Check for +12V at emergency master buss.
Refer to "+12 volts not present at emergency master buss" troubleshooting procedure.
Step 4.
Check for +1 2V at circuit breaker #1 on emergency master buss.
Replace breaker (see para 4-99).
4-100
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