TM 55-1520-240-23-T 16-208     Change 24       16-5.4  DCDU CIRCUIT BREAKER WILL NOT STAY CLOSED (Continued) 16-5.4 OPEN NO. 1 EAPS/MEAPS CIRCUIT BREAKER PANEL. CHECK DCDU CIRCUIT BREAKER FOR FAULTY CONDITION.  IS DCDU CIRCUIT BREAKER OPERATIONAL?   REMOVE & REPLACE DCDU CIRCUIT BREAKER. END OF TASK DISCONNECT PLUG 147P30 FROM DCDU.  DOES CB STILL OPEN WHEN SYSTEM IS POWERED UP? DISCONNECT PLUG 147P4 FROM REMOTE BYPASS SW PANEL.  DOES CB STILL OPEN? OPEN LEFT ELECTRICAL COM- PARTMENT DOOR. REMOVE WIRE W697-156-20 FROM RELAY 147K1 TERMINAL AZ.  DOES CB STILL OPEN? LOCATE AND REPAIR FAULT TO WIRING W697-156-20 OR ASSOCIATED WIRING TO DCDU CB. WITH DCDU CB OPEN, IS GROUND PRESENT ON PLUG 147P30 PIN 2? CHECK WIRE NO. ALE47-013A22 FOR FAULTY CONDITION. REPAIR/REPLACE FAULTY WIRING/ COMPONENT ON REMOTE BYPASS SW PANEL. REMOVE AND REPLACE DCDU. INSTALL WIRE W697-156-20 ON RELAY 147K1 TERMINAL AZ.  DISCONNECT PLUG 300P52 AT STA. 460L OVERHEAD. DOES CB STILL OPEN? CHECK WIRE W668-177-20 FOR FAULTY CONDITION. CHECK WIRES W697-158-20, W697-159- 20, AND W697-157-20 FOR FAULTY CONDITION.  DOES CB STILL OPEN? REMOVE AND REPLACE RELAY 147K1. NO YES YES YES YES YES YES NO NO NO NO NO YES