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TAP-121
: Trouble Clearing
Page 1 of 2
1.
Is fuse FA or FB blown?
If YES, then do DLP-555.
If NO, then proceed to Step 2.
2.
Condition DMM (digital multimeter) to measure voltage.
3.
!
CAUTION:
If fuse on User Panel is not blown, trouble may be a failure of one of the
–48V DC power feeders. Removing the wrong fuse or disconnecting the
wrong feeder for power measurement will cause service interruption.
Measure voltage at fuse holder FA or FB.
4.
Does voltage measure less than –40 volts DC?
If YES, then continue with Step 5.
If NO, then proceed to Step 7.
5.
!
CAUTION:
During brownout conditions the SYSCTL will suspend normal operations.
No alarms will be generated and CIT commands will not work. Local and
remote logins will not work.
Trouble in power feeder(s). Check office battery distribution panel for
low-voltage condition.
6.
STOP. YOU HAVE COMPLETED THIS PROCEDURE.
7.
Is shelf equipped with BBG8 or BBG8B SYSCTL circuit pack?
If BBG8, then continue with Step 8.
If BBG8B, then proceed to Step 11.
8.
Are frame ground and battery return feeders at the same potential?
If NO, then continue with Step 9.
If YES, then proceed to Step 11.
Clear Brownout Condition
Flashing L in FE ID Display
DDM-2000 OC-3 M
Issue 2, February 2000
ULTIPLEXER
363-206-285
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