NEC manual Fault of CCH, DTI and Related Flat Cable, NDA-24300CHAPTER

Models: NDA-24300

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12.4 Fault of CCH, DTI and Related Flat Cable

START

Check connectors and flat cables between

DTI and CCH.

Check the connector.

Check the flat cable.

Check by replacing the DTI card with spare.

END

FAULT REPAIR PROCEDURES

On DTI cards, set MB switch UP. On CCH card, set MBR switch UP.

Check whether the connector is correctly con- nected or not. If the connection is found im- proper, plug and unplug the connector a few times.

On DTI cards, set MB switch DOWN. On CCH card, set MBR switch DOWN.

Check whether the fault is still indicated.

On DTI cards, set MB switch UP. On CCH card, set MBR switch UP.

Test the continuity of the flat cable. If found to be abnormal, replace the flat cable with a spare.

On DTI cards, set MB switch DOWN. On CCH card, set MBR switch DOWN.

Check whether the fault is still indicated.

On DTI card, set MB switch UP and extract the card from the mounting slot.

On a new DTI card, make the switch setting.

On new DTI card, set MB switch UP and insert the card into the mounting slot.

On new DTI card, set MB switch DOWN.

Check whether the fault is still indicated.

NDA-24300CHAPTER 5

Page 385

Issue 1

Page 412
Image 412
NEC manual Fault of CCH, DTI and Related Flat Cable, NDA-24300CHAPTER