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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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