Lucent Technologies SLC 5 Series Manual page 425

363-205-401
Issue 7, March 1997
Clear FAIL LED Problems on a Unit During
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.
Turnup and Conversion
Conversions: TAP-100
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