363-206-305 Trouble Clearing:
Issue 3, June 2000 Page 1 of 2
DDM-2000 F
IBER
R
EACH
N
ARROWBAND
S
HELF
TAP-105
Clear PCU Failure Alarm
SUMMARY:
This procedure tells how to clear an PCU failure alarm. As a stimulus to perform this
procedure, you have retrieved an alarm message from the the
SLC-
2000 host that
indicates a problem at the NBS. You could also have been directed to go to the NBS
site by the surveillance center or you could have observed a FAIL LED indication on
the PCU at the NBS site.
1. Open the electronics compartment door using the 216-type tool or screwdriver.
2. Connect your ESD wrist strap to the ESD GRD ground jack located at the
lower left front of the electronics compartment.
3. Verify that the FAIL LED on the PCU is lit.
4.
!
CAUTION:
Before removing the
PCU
, unlatch the unit and wait 1 minute for
capacitors to discharge.
Remove the failed PCU.
5. Locate the PCU to be installed and inspect the unit for damage.
6. Check for a blown fuse.
7. Ensure that fuses are installed in fuse holder on faceplate.
8. Install the replacement PCU.
9. Is the FAIL LED extinguished?
If YES, proceed to Step 11.
If NO, continue with Step 10.
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