NEC SV8500, Operation And Maintenance Manual

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CHAPTER 5 Operation Procedure for System with PIR
Figure 5-27 Controlling CCIS Line
4.12.3 Specific CCH/CCT Card Is Faulty
(1) Check by replacing CCH/CCT card with a spare.
(a) On CCH/CCT card, set the MBR switch UP.
(b) On CCH/CCT card, set MBR switch UP and extract the card from its mounting slot.
(c) Make switch settings on a new CCH/CCT card.
(d) On new CCH/CCT card, set MBR and MB switches UP and insert the card into its mounting slot.
(e) On new CCH/CCT card, set MB switch DOWN.
(f) On new CCH/CCT card, set MBR switch DOWN.
(g) Check whether the fault is still indicated.
4.12.4 Fault of CCH, DTI and Related Flat Cable
(1) Check connectors and flat cables between DTI and CCH.
[Check the connector]
(a) On DTI cards, set MB switch UP. On CCH card, set MBR switch UP.
(b) Check whether the connector is correctly connected or not. If the connection is found improper, plug
and unplug the connector a few times.
(c) On DTI cards, set MB switch DOWN. On CCH card, set MBR switch DOWN.
(d) Check whether the fault is still indicated.
[Check the Flat cable]
(a) On DTI cards, set MB switch UP. On CCH card, set MBR switch UP.
(b) Test the continuity of the flat cable. If found abnormal, replace the flat cable with a spare.
MUX
CCH
CCT
DTI
LT Cable
Front
Cable
MDF
To CCIS Line
LT Cable