363-206-305 Trouble Clearing:
Issue 3, June 2000 Page 1 of 2
DDM-2000 F
IBER
R
EACH
N
ARROWBAND
S
HELF
TAP-107
Clear CU Stuck Relay Alarm
Summary:
This procedure tells how to clear a
CU stuck relay
alarm. As a stimulus to perform this
procedure, you have retrieved an DT failure alarm message from the CIT port in the
SLC-
2000 host and observed a FAIL LED indication on the DSXBIU at the NBS site.
You could also have been directed to go to the NBS site by the surveillance center. If
both the FAIL and NE lamps are on, we have facility problems. If the FAIL lamp only
is on, we have a bad board.
1. Open the electronics compartment door using the 216-type tool or screwdriver.
2. Connect your electrostatic discharge wrist strap to the ESD GRD ground jack
located at the lower left front of the electronics compartment.
3. Locate the channel unit that has the stuck relay.
4. Verify that none of the up to four drops assigned to this unit are busy.
5. Replace and test the channel unit (NTP-005).
6. Has the
CU stuck relay
alarm cleared?
If YES, proceed to Step 8.
If NO, continue with Step 7.
7.
NOTE:
The CDTU may also cause the
CU stuck relay
alarm.
If
CU stuck relay
alarm does not clear, replace CDTU.
8. When the trouble is cleared, remove your wrist strap, and secure the
electronics compartment.
9. STOP. YOU HAVE COMPLETED THIS PROCEDURE.
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