NEC ND-71762(E) system manual Fault Repair Procedure for Digital Ccis Line, Start

MAINTENANCE PROCEDURE

3.3 Fault Repair Procedure for Digital CCIS Line

START

Check the connectors and flat cables between DTI and CCH.
	Check the connector	On the DTI card, set the MBR switch UP . On the CCH card,
		set the SW01-0, 1 UP .
		On the DTI/CCH card, set the MB switches UP .
		Check whether the connector is correctly connected or not for
		both cards. If the connection is found an improper connection, plug and
		unplug the connector for a few times.
		On the DTI and CCH cards, set the MB and MBR switches
		DOWN .
		Check whether the fault is still indicated or not.
	Check the flat cable	On the DTI card, set the MBR switch UP . On the CCH card,
		set the SW01-0, 1 UP .
		On the DTI and CCH card, set the MB switches		UP .
		Test the continuity of the flat cable. If found abnormal,
		replace the flat cable with spare.
		On the DTI and CCH cards, set the MB and MBR switches
		DOWN .
		Check whether the fault is still indicated or not.
Check by replacing the DTI card		On the DTI card, set the MBR switch UP and then MB switch
with spare		UP .
		Extract the card from the mounting slot.
		On a new DTI card, make switch setting referring to the
		extracted card.
		On the new DTI card, set the MBR switch	UP .
		On the new DTI card, set the MB switch	UP and insert the
		card into the mounting slot.
		On the new DTI card, set the MBR and MB switches DOWN .
		Check whether the fault is still indicated or not.
Check by replacing the CCH/CCT		On the CCH/CCT card, set the MBR switch UP.
card with spare		Note : MBR switch s name varies depending on the card.
		On the CCH/CCT card, set the MB switch UP and extract the
		card from its mounting slot.
		Make switch setting on the new CCH/CCT card, referring to
		the card extracted.
		On the new CCH/CCT card, set the MBR and MB switches
		UP and insert the card into its mounting slot.
		On the new CCH/CCT card, set the MB switch		DOWN .
		On the new CCH/CCT card, set the MBR switch		DOWN .
		Check whether the fault is still indicated.

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ND-71762 (E)CHAPTER 8

Page 115

Issue 2