NEC NDA-24300 manual Fuse Blown Fault, Start

8.2 Fuse Blown Fault

START

Check the backplane of the PIM.

Extract all the circuit cards from the PIM, and insert them back into their slots individually to see if the fuse blows.

END

FAULT REPAIR PROCEDURES

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

Set the MB switch of the PWR supply UP.

Set the circuit breaker of the PWR supply DOWN.

Extract all the circuit cards from their mounting slots, except PWR supply.

Replace the fuse with spare.

Set the circuit breaker of the PWR supply UP side.

Set the MB switch of the PWR supply DOWN.

Insert the circuit cards into their mounting slots individually, with their MB switch to UP side.

Check to see if the fuse blows when the MB switch has been set to DOWN.

NDA-24300CHAPTER 5

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