NEC NDA-24300 manual Circuit Breaker OFF Fault in PWR Supply

FAULT REPAIR PROCEDURES

8.3 Circuit Breaker OFF Fault in PWR Supply

START

Check the backplane of the PIM.

Extract all the circuit cards from the PIM, and make a visual check of the circuit cards.

END

Make a visual check on the backplane for pin contacting, melting or burning, etc.

Set MB switch of the PWR supply UP.

Set the circuit breaker of the PWR supply DOWN.

Extract all circuit cards out of their mounting slots.

Make a visual check of the extracted circuit cards. Check ICs, resistors, and capacitors to see if any are burned.

CHAPTER 5 NDA-24300

Page 372

Issue 1