363-205-401
Conversions:
Issue 7, March 1997
Page 1 of 4
DLP-504
Install Digital Test Unit (DTU)
1.
NOTE:
The DTU consists of two units designated DTU-L (DTU-left) and DTU-R
(DTU-right).
Get one DTU-L (AUA18) and one DTU-R (AUA19) and inspect for possible
physical damage.
2.
Insert DTU-L into left-hand side of DTU slot in facility shelf.
Response:
All bank indicators are off and no office alarms are active.
3.
While observing FAIL indicator on DTU-R faceplate, insert DTU-R into
right-hand side of DTU slot in facility shelf.
Response:
DTU-R FAIL indicator lights momentarily. All bank indicators
are off and no office alarms are active.
4.
Does FAIL indicator on DTU-R go off and remain off?
If YES, then proceed to Step 9.
If NO, then continue with Step 5.
5.
Replace both DTU-L and DTU-R while observing FAIL indicator on DTU-R
faceplate.
Response:
DTU-R FAIL indicator lights momentarily.
6.
Does FAIL indicator on DTU-R go off and remain off?
If YES, then proceed to Step 9.
If NO, then continue with Step 7.
7.
Replace DTU-L and DTU-R with units removed previously.
8.
Check wiring using SD-7C117-01 or SD-7C117-02. Repeat procedure from
Step 4 after locating and correcting trouble.