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 oscilloscope settings change for this step, refer to figure 4-2.
·
The signal will be a square wave, refer to figure 4-2.
Step 2.
Refer to table 4-5, attach probe ground to data receiver CCA ground, test point 7 (TP-7), and probe to
TP-8. Refer to figure 4-2 and verify data output signal of data receiver CCA, waveform of figure 4-2.
If signal is present go to step 8, otherwise go to step 3.
NOTE
·
The oscilloscope settings change for this step, refer to figure 4-2.
·
The signal will be an FSK signal shifting between 1,070 and 1,270 hertz, refer to figure 4-2.
Step 3.
Refer to figure 4-2, attach probe ground to data receiver CCA ground, TP-7, and probe to TP-5. Refer to
figure 4-2 and verify data input signal of data receiver CCA, waveform of figure 4-2.
If shifting signal is present go to step 7, otherwise if this is the first measurement at TP-5, refer to
TM 5-6350-280-10 turn equipment off, ensure data receiver CCA is properly seated, refer to
TM 5-6350-280-10 turn equipment on, and repeat step 3, otherwise go to step 4.
NOTE
·
The oscilloscope settings change for this step, refer to figure 4-1.
·
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 4.
Refer to TM 5-6350-280-10 turn equipment off. Refer to paragraph 4.6.7 and remove data receiver CCA.
Refer to figure 4-1 and verify signal output at terminals 2 and 6 on data receiver CCA connector mounted
on backplane assembly, waveform of figure 4-1.
If shifting signal is present go to step 7, otherwise go to step 5.
4-5
