Lucent Technologies SLC 5 Series - Clear FAIL LED Problems on a Unit During Turnup and Conversion

363-205-401 Conversions:
Issue 7, March 1997 Page 1 of 4
TAP-100
Clear FAIL LED Problems on a Unit During
Turnup and Conversion
Use this procedure when on installing a unit, the unit's
FAIL
LED remains lighted or
fails to light momentarily and go off. This procedure assumes there are no blown
fuses on the
BFU
,
CFU
, or
LFU
fuse units and each
PCU
voltage (-42 to -56 V DC) is
present.
1. Press and hold
LED TEST
button on the
ADU
.
2. Do the LEDs on the common units light?
If
YES
, proceed to Step
12
.
If
NO
, continue with Step
3
.
3. Replace the bank control unit (
BCU
).
4. Press and hold
LED TEST
button on the
ADU
.
5. Do the LEDs on the common units light?
If
YES
, proceed to Step
12
.
If
NO
, continue with Step
6
.
6. Replace the
BCU
with the
BCU
removed previously.
7. Replace the alarm display unit (
ADU
).
8. Press and hold
LED TEST
button on the
ADU
.
9. Do the LEDs on the common units light?
If
YES
, proceed to Step
12
.
If
NO
, continue with Step
10
.
10. Replace the
ADU
with the
ADU
removed previously.
11. Check the wiring using SD-7C117-01, SD-7C117-02, or SD-7C117-03. After
locating and correcting the wiring trouble, go back to the NTP and reinstall the
unit with the
FAIL
LED problem.