TM 5-6350-280-23&P
Table 4-1. Remote Area COM Message/Troubleshooting Procedure Cross-Reference List continued.
COM Message on
Meaning of Refer to
Troubleshooting
Computer Printout
COM Message
Procedure
COM-FAIL-100
Synchronization loss.
1*
COM-FAIL-011
Data signal loss and a
1
line fault or low signal
level is present.
COM-FAIL-110
Synchronization and data
1
signal loss.
COM-FAIL-101
Synchronization loss and a
1
line fault or low signal
level is present.
COM-FAIL-111
Synchronization and data
1
signal loss and a line
fault or low signal level
is present.
*When message is alternating between COM-FAIL-100 and COM-norm-000 perform troubleshooting procedure 9.
Table 4-2. Troubleshooting Table.
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. REMOTE AREA COM-FAIL.
NOTE
· An oscilloscope is required for this procedure.
· Refer to figure 4-4, Appendix E and tables 4-6 through 4-10 for
schematics and wiring diagrams.
Step 1.
Refer table 4-3, attach A probe to the A input and the B probe to the B
input of terminal board, TB1, on surge suppressor CCA. Refer to figure 4-1
and verify signal input from remote area data transmitter, waveform
of figure 4-1.
NOTE
The measured waveform will be oscillating between 1,070 and 1,270 Hertz.
If shifting signal is present go to step 2, otherwise refer to J-SIIDS TM 5-6350-264-14 series and troubleshoot
the data transmitter or transmission lines of the J-SIIDS.
4-3
