NEC NDA-24300 manual Fault of Alarm Lamps on PWR Supply, Fault Supervision

8.4 Fault of Alarm Lamps on PWR Supply

START

Press RESET button of the PWR supply.

Alarm lamp goes out.

Alarm lamp illuminates again.

END

FAULT REPAIR PROCEDURES

FAULT SUPERVISION

Set the MB switch on the PWR supply UP.

Turn circuit breaker OFF.

Set MB switch on all the circuit cards, except PWR supply.

Extract all circuit cards from their mounting slots.

Turn circuit breaker ON.

Set the MB switch to DOWN side.

Check to see if the alarm lamp illuminates.

If the alarm lamp illuminates, replace the PWR supply with a spare.

If the alarm lamp does not illuminate, insert the circuit cards

into their mounting slot individually to see if the alarm lamp illuminates.

Note: Insert each PWR supply with its MB switch to UP side, and then set it back to DOWN side.

NDA-24300CHAPTER 5

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