363-206-285 Trouble Clearing: TAP-118
Issue 2, February 2000 Page 2 of 8
DDM-2000 OC-3 MULTIPLEXER
5. !
CAUTION:
Exercise care in removing the fiber tray or fiber support bracket to prevent
damage to the optical fibers.
NOTE:
To remove the front cover of a fan shelf located between two OC-3
shelves it may be necessary to remove either the fiber tray from the top
OC-3 shelf, if it is a G1 shelf, or the fiber support bracket, if the shelf is a
G3 or G4 shelf.
Trouble in fan shelf. Remove front cover, disconnect cables to all 4 fan packs,
and reset circuit breakers. If circuit breakers trip again, replace the fan shelf. If
circuit breakers do not trip, reconnect fan units one at a time and replace the
fan unit that causes the breaker to trip. The fan shelf must be repaired within 4
hours of minor alarm indication. Service interruption and/or circuit pack failure
may occur if fan shelf is not replaced.
6. STOP. YOU HAVE COMPLETED THIS PROCEDURE.
7. Trouble in power feeder(s). Check office battery distribution fuse panel for
blown fuses. Check power feeders to fan shelf. Power must be restored within
4 hours of minor alarm indication. Service interruption and/or circuit pack
failure may occur if power is not restored and fan made operational.
8. STOP. YOU HAVE COMPLETED THIS PROCEDURE.
9. Is POWER FAULT LED lighted on fan shelf?
If YES, then continue with Step 10.
If NO, then proceed to Step 17.
10. Is circuit breaker tripped?
If NO, then continue with Step 11.
If YES, then proceed to Step 13.
11. Trouble in one of the power feeders. Check office battery distribution fuse
panel for blown fuses. Check power feeders to fan shelf.
12. STOP. YOU HAVE COMPLETED THIS PROCEDURE.
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