Specifications

FLM-1 Installation & Operation Manual Chapter 4 - Troubleshooting and Diagnostics
09/01/01 4:29 PM Fault Isolation and Troubleshooting 4-3
Table 4-1 Fault Isolation and Troubleshooting
Symptom Action
All front panel
indicators are OFF
1. Check that power is supplied to the unit.
2. Check the fuse inside the AC receptacle on the rear panel and replace it
with a new one.
3. Replace the unit. The fault is probably in the unit's power supply circuits.
LOCAL SYNC
LOSS LED is ON
1. Perform an LLB test as described in Section 4-1. The yellow TEST LED
should light and LOCAL SYNC LOSS should go OFF. If this does not
happen, replace the local unit. Otherwise proceed to step 2.
2. Perform an RLB test. The yellow TEST LED should light and LOCAL
SYNC LOSS should go OFF. If this does not happen, replace the local
unit. Otherwise proceed to step 3.
3. Perform steps 1 and 2 at the remote site. If the fault is still not located,
replace both units one at a time. If the problem persists, the main
channel link between the units is probably defective and should be
checked.
REMOTE SYNC
LOSS LED is ON
4. Perform an LLB test at the remote unit. The yellow TEST LED should light
and LOCAL SYNC LOSS should go OFF. If this does not happen, replace
the remote unit. Otherwise proceed to step 2.
5. Perform an RLB test at the remote unit. The yellow TEST LED should light
and LOCAL SYNC LOSS should go OFF. If this does not happen, replace
the remote unit. Otherwise proceed to step 3.
6. Perform steps 1 and 2 at the local site. If the fault is still not located,
replace both units one at a time. If the problem persists, the main
channel link between the units is probably defective and should be
checked.