Quantcast Table 4-18. TROUBLESHOOTING CHART (Cont'd) - TM-11-5895-1141-340099

 

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Table 4-18. TROUBLESHOOTING CHART (Cont'd) - TM-11-5895-1141-340098
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TM-11-5895-1141-34 Control Radio Channel C-1 0931 (P)/FRC (NSN
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Table 4-18. TROUBLESHOOTING CHART (Cont'd) - TM-11-5895-1141-340100


TM 11-5895-1141-34
Table 4-18. TROUBLESHOOTING CHART (Cont'd)
Item
Fault
Check/Corrective Action
d. Transmitter channel
status bus to U1205C is
open. Check connections
between selector unit assem-
bly and audio unit assembly.
Check for open diode CR1006.
14
No busy tone heard when
a. Check for open busy-tone
attempting to key an already
enable bus. Check for Q1009
keyed channel.
or defective U1OO1B
b. Defective busy-tone
generator. Check Q1105.
15
No sidetone heard while
Check stage U1205D.
transmitting but received
audio functions properly.
16
No audio at headset from any
a. Defective headphones
receiving channel; loud-
speaker audio functions
b. Defective headset ampli-
properly.
fier in volume control
module. Check UllOl1, U1103,
Q1103, Q1104 and the regu-
lated amplifier (U1102,
U1104, Ql101).
17
No audio at the loudspeaker
a. Defective loudspeaker
from any receiving channel;
LS101
headset audio functions
properly.
b. Stage U1105 in volume
control module defective.
c. Speaker amplifier defec-
tive. Check for Q1401,
Q1402, Q1403, Q1404, Q1405.
18
No audio at loudspeaker or
Interlock bus shorted to
headset from any receiving
ground. Locate and remove
channel. Syllabic lamp
fault.
DS1002 flashing. No channel
can be keyed to transmit.
4-53


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