363-206-305 Trouble Clearing:
Issue 3, June 2000 Page 1 of 2
DDM-2000 F
IBER
R
EACH
N
ARROWBAND
S
HELF
TAP-104
Clear CDTU Failure Alarm
Summary:
This procedure tells how to clear an CDTU failure alarm. As a stimulus to perform this
procedure, you have retrieved a DT failure alarm message from the CIT port in the
SLC-
2000 host and observed a FAIL LED indication on the CDTU 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 ground jack
located at the lower left front of the electronics compartment.
3. Verify that the FAIL LED on the CDTU is lit.
The NE LED on the DSXBIU is also lit.
4. Is rightmost fuse (3.0A) blown on the faceplate of the PCU?
5. Remove the failed CDTU.
6. Locate the CDTU to be installed and inspect the unit for damage.
7. Install the replacement CDTU.
8. Is the FAIL LED extinguished?
If YES, replace fuse and repeat Step 3.
If NO, continue with Step 5.
If YES, proceed to Step 10.
If NO, continue with Step 9.
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