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Page Title:
Table 4-18. TROUBLESHOOTING CHART (Cont'd) |
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|  TM 11-5895-1141-34
Table 4-18. TROUBLESHOOTING CHART (Cont'd)
Item
Fault
Check/Corrective Action
9
A channel cannot be keyed.
a. Diode CR1013 open
Green lamp lights but red
lamp does not on the asso-
b. U1001 defective
ciated selector unit.
c. Q10OB defective
10
A channel cannot be keyed.
a. Switch S1002 defective
Neither green nor red lamp
lit on associated selector
b. Loose connection between
unit.
selector unit plug P204 and
audio unit jack J102 or
selector unit jack J204
11
A channel cannot he keyed.
a. Relay K1001 defective
Green and red lamp both lit
on the associated selector
b. Loose or defective con-
unit.
nection to radio channel
equipment from the output of
this channel.
Receiving
Circuits
12
No channels can be keyed.
a. Interlock bus shorted to
Green and red lamps on
ground Fault must be removes
selector unit both lit.
b. Defect in transmitting
equipment.
13
No audio signal reaches the
a. Defective microphone,
keyed transmitter.
b. Loss of audio in micro-
phone amplifier module.
Check U1201, regulated
amplifier (U1202, U1204,
Q1201), Q1202, Q1203, and
Q1205.
c. Loss of audio in the
selector unit. Check for
Q1010, Q1011
4-52
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