TAP-112 : Trouble Clearing 363-206-285
Page 11 of 16 Issue 2, February 2000
DDM-2000 OC-3 MULTIPLEXER
24. Is FILTER REPLACE or any FAULT LED lighted on fan shelf?
If NO, then continue with Step 25.
If YES, then go to TAP-118.
25.
!
CAUTION:
If fuse on User Panel is not blown, trouble may be a failure of
one
of the
–48V DC power feeders. Removing the wrong fuse or disconnecting the
wrong feeder for power measurement will cause service interruption.
Blown fuses are detected by noting that the fuse indicator pin is extended
through the fuse holder.
NOTE:
If fuse is not blown on the User Panel, check office battery distribution
fuse board for blown fuses or tripped breakers. Replace fuse or reset
breaker if necessary.
Is –48V fuse blown on User Panel?
If YES, then continue with Step 26.
If NO, then do TAP-113.
26.
NOTE:
The fuses on the G1 shelf User Panel are 5 amp indicator type fuses,
COMCODE 405697442. With older fuse types, insure the indicator end of
the fuse is placed into the fuse cap so the indicator can protrude through
the hole in the fuse cap if the fuse blows. The fuses on the G3 and G4
shelf User Panel are 5 amp fuses, COMCODE 406203976. The
extraction tool COMCODE for these fuses is 406420273.
Replace blown –48V fuse on User Panel?
27. Did fuse blow again?
If YES, then proceed to Step 29.
If NO, then continue with Step 28.
28. Is MINOR alarm cleared?
If YES, then STOP. YOU HAVE COMPLETED THIS PROCEDURE.
If NO, then proceed to Step 31.
TAP-118
TAP-113
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