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Page Title:
Table 2-2. System Troubleshooting Chart |
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|  TM-11-5830-263-20&P
Table 2-2. System Troubleshooting Chart (continued)
Test Number
Symptom
Probable Causes
Corrective Measures
4
MCS ANR Power Fault
a. Defective MCS.
See figure 2-42.
LED illuminates.
b. Defective highway cable
assembly.
c. Defective headset.
d. Defective FFCS/MOS
headset.
5
MCS alphanumeric
Defective MCS.
Replace defective MCS.
display does not change
when SYSTEM switch is
moved between positions
P1, P2, P3, LS, or ALL.
6
MCS alphanumeric
Defective MCS.
Replace defective MCS.
display shows incorrect or
illegal characters.
7
Programming positions
Defective MCS.
Replace defective MCS.
P1, P2, and P3 have
changed without operator
changing.
8
Radio can be keyed from a. Defective RIT.
See figure 2-43.
an FFCS when MCS
b. Defective MCS.
SYSTEM switch is in
LISTENING SILENCE
mode.
9
No radio communication a. Defective radio.
See figure 2-44.
(transmitting and/or
b. Defective radio cable
receiving ) at more than 1
assembly.
FFCS but communication c. Defective RIT.
over intercom is still
d. Defective MCS.
possible.
e. Defective headset.
10
Radio does not key from a. Defective bailout cable.
See figure 2-45.
a specific FFCS but
b. Defective headset.
communication over
c. Defective FFCS.
intercom is still possible.
11
Unable to communicate
Defective MCS.
Replace defective MCS.
(transmitting and/or
receiving ) on intercom
and radio at 2 or more
crewstations.
12
Unable to communicate
a. Defective bailout cable.
See figure 2-46.
(transmitting and/or
b. Defective headset.
receiving ) on intercom
c. Defective FFCS/MOS.
and radio from any 1
MOS or FFCS.
13
Intercom continuously
a. Defective bailout cable.
See figure 2-47.
keyed.
b. Defective headset.
c. Defective vehicle PTT
cable.
d. Defective FFCS.
2-43
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