Locating And Clearing Faults; Fault Isolation Tests; Defective Line Drawer; Defective Shelf Circuit Pack - Nortel DMS-100 Series Maintenance Manual

Locating and clearing faults

The standard troubleshooting steps for how to locate and clear faults are as
follows:
1 Silence any audible alarms the system causes after detection of alarm
2 To isolate the fault, read the status displays and trace fault codes to the
3 Busy the hardware to remove system access to the defective component.
4 Test the defective component and identify the cards that you must
5 Return the hardware to service.

Fault isolation tests

The detection of a fault condition in the RLCM requires a maintenance
action. Fault isolation tests determine the location of the fault. The tests
correct the fault condition. These tests results must be reported to the
appropriate maintenance support. The following sections list the procedures
to isolate and correct faults with specified RLCM components.

Defective line drawer

To handle a defective line drawer:
1 Post, busy, test, and RTS the drawer.
2 If test or RTS failure occurs with a card list, use an appropriate card
3 If test or RTS failure occurs without a card list, perform the MAP

Defective shelf circuit pack

To handle a defective shelf circuit pack:
1 Post the line concentrating module (LCM).
2 Determine if fault indicators are present.
3 Busy the unit with the defective card.
4 Perform the appropriate card replacement procedures.
5 Test and RTS the LCM unit.
conditions.
menu level needed to clear the fault.
This removal of access prevents system interference and allows the
performance of maintenance activity.
replace. Replace the defective card and test it again.
replacement procedure to replace the cards. Test the cards again and
RTS the drawer.
terminal response tests and RTS the drawer.
Trouble isolation and correction 8-3
DMS-100 Family Maintenance Manual ABSK007