363-205-401 RT Turn Up:
Issue 7, March 1997 Page 1 of 2
DLP-513
Install PCU Unit in CD Shelf
SUMMARY:
Install
PCU
into CD shelf and verify that
FAIL
indicator is off. Measure
−42 to −56 V DC at
PCU
faceplate.
1. Get one
PCU
(
AUA11
,
AUA11B
or
AUA11C
) and inspect for possible dam-
age.
2. Insert
PCU
into
PCU
slot in CD (upper) shelf of channel bank.
Response:
MJ
and
NE
indicators on
ADU
and
DIGROUP C, D
indicators
on
BCU
are lighted.
FAIL
indicator on
PCU
should be off.
3. Does
FAIL
indicator on
PCU
go off and remain off?
If
YES,
then proceed to Step
8.
If
NO,
then continue with Step
4.
4. Replace
PCU
.
5. Does
FAIL
indicator on
PCU
go off and remain off?
If
YES,
then proceed to Step
8.
If
NO,
then continue with Step
6.
6. Replace
PCU
with
PCU
removed previously.
7. Use SD-7C117-01 or SD-7C117-02 to check wiring. Repeat procedure from
Step
2
after locating and correcting trouble.
8. Condition DMM to measure volts DC.
9. On
PCU
faceplate, connect DMM test leads to
GND
jack and −
48
jack.
10. Does DMM indicate between −42 and −56 volts?
If
YES,
then proceed to Step
20.
If
NO,
then continue with Step
11.
11. Verify that wiring from power shelf to
PCU
in facility shelf is present and con-
nected properly.
To Next Page
Loading...
