TAP-114: Trouble Clearing 363-206-285
Page 1 of 6 Issue 2, February 2000
DDM-2000 OC-3 MULTIPLEXER
Clear External Minor Alarm at RT
1. Are there any blown fuses on battery shelf or BFU (for bulk powering)?
If YES, then continue with Step 2.
If NO, then proceed to Step 4.
2. Replace blown fuse(s).
3. Does alarm clear?
If YES, then STOP. YOU HAVE COMPLETED THIS PROCEDURE.
If NO, then continue with Step 4.
4. Is bulk power (J1C182BB bulk power shelf) being used?
If YES, then proceed to Step 25.
If NO, then continue with Step 5.
5. Is OPEN BATT LED on 337A BATTERY CHARGER lighted at RT battery
shelf?
If YES, then continue with Step 6.
If NO, then proceed to Step 25.
6. Condition DMM (digital multimeter) to measure voltage.
7. Measure voltage at –48B and GND and –48L and GND jacks on the LDU
faceplate.
8. Does voltage measure between –42 and –58 volts?
If YES, then continue with Step 9.
If NO, then proceed to Step 18.
9. Use SD-7C119 to check wiring between 337A BATTERY CHARGER and
batteries.
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