TM 5-6350-280-23&P
Table 4-2. Troubleshooting Table - continued.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. REMOTE AREA COM-FAIL - continued.
NOTE
·
The signal will be an FSK signal shifting between 1,070 and 1,270 hertz, refer to
figure 4-1.
·
Noise may be present in signal.
Step 5.
Refer to paragraph 4.6.6 and disconnect area input cable assembly from backplane. Refer to
figure 4-1 and table 4-4 and verify signal output from area input cable assembly, waveform of
figure 4-1.
If shifting signal is not present go to step 6, otherwise refer to paragraph 4.6.9 and replace backplane.
NOTE
·
The signal will be an FSK signal shifting between 1,070 and 1,270 hertz, refer to
figure 4-1.
Step 6.
Refer to paragraph 4.6.6 and disconnect area input cable assembly from surge suppressor CCA. Refer
to figure 4-1 and table 4-3 and verify signal output from surge suppressor CCA, waveform of figure 4-1.
If shifting signal is present refer to paragraph 4.6.6 and replace area input cable assembly, otherwise
refer to paragraph 4.6.11 and replace surge suppressor CCA.
Step 7.
Refer to paragraph 4.6.7 and replace data receiver CCA.
If remote area COM-FAIL is still present on monitor go to step 8.
Step 8.
Refer to paragraph 4.6.8 and replace central processing unit (CPU) CCA.
If remote area COM-FAIL is still present on monitor go to troubleshooting procedure 9.
2. SINGLE MODULE (MOD) FAILURE.
Step 1.
With the computer monitor displaying the monitor area status screen, refer to table 4-5 and press reset
button on central processing unit (CPU) CCA. Wait 30 seconds and check monitor area status screen for
module COM failure.
If module COM failure is present go to step 2.
NOTE
Do not seat CPU CCA while equipment power is on.
Step 2.
Visually check to ensure CPU CCA is securely seated in backplane.
If CPU CCA is properly seated in backplane go to step 3, otherwise refer to TM 5-6350-280-10 turn
equipment off, ensure CPU CCA is properly seated, and refer to TM 5-6350-280-10 turn equipment on. If
module COM failure is still present go to step 3.
4-7
