NEC NDA-24300 manual End

(1) Check by minimizing the system configuration

Mount only the basic circuit cards in CPU No. 0 system and initialize.

Initialization cannot be made.

END

FAULT REPAIR PROCEDURES

Remove all circuit cards from CPU No. 0 system except the basic circuit cards.

Circuit cards to be mounted are as follows: CPU, EMA, TSW, MUX

(EMA: PH-PC40, TSW: PH-SW12, MUX: PH-PC36)

On the CPU Display Panel (DSP), set its SENSE switch to “1.”

Press Reset (RST) button on the DSP.

CPU OPE lamp should be illuminated on the DSP.

Check by replacing the basic circuit cards indi- vidually.

Set MB switch of the circuit card UP and extract the circuit card from its mounting slot.

Make necessary switch settings on the new circuit card.

Set MB switch of the new circuit card UP and insert the circuit card into its mounting slot.

Set MB switch DOWN.

On the DSP (CPU), set SENSE switch to “1.”

Press RST button on the DSP.

CPU OPE lamp should illuminate on the DSP.

If CPU OPE lamp of the DSP does not illuminate, replace next circuit card and check it. (Repeat the above steps for all basic circuit cards.)

NDA-24300CHAPTER 5

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