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

FAULT REPAIR PROCEDURES

13.4 Fault of DCH, DTI, and Related Flat Cable

START

Check the connectors and flat cables between DTI and DCH.

Check the connector.

Check the flat cable.

Check by replacing the DTI card with a spare.

END

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

Check whether the connector is correctly connected. If the connection is found improper, plug and unplug the connector a few times.

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

Check whether the fault is still indicated.

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

Test the continuity of the flat cable. If abnormal, replace the flat cable with spare.

On DTI cards, set MB switch DOWN. On DCH 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 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.

CHAPTER 5 NDA-24300

Page 388

Issue 1