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TM 11-5820-518-20
3-11. Organizational Troubleshooting Chart
Item
No.
Trouble symptom
Probable trouble
Checks and corrective measures
5
External blower does not
a. External blower (fig. 1-4) fuse
a. Remove external blower air filter
operate.
burned out, or defective external
(para 3-14a) and check fuse F1;
blower.
replace if defective. Replace ex-
ternal blower (para 3-15).
b. Defective radio set control or
b. Check by substitution (para
receiver-transmitter.
3-13 and 3-17) ; refer defective
unit to higher category of main-
tenance.
a. Defective headset or receiver-
a. Replace defective headset. If
6
a. No audio in headset
transmitter.
headset is good, replace receiver-
t r a n s m i t t e r (para 3-13). Higher
category of maintenance required.
b. Defective SENS control, or
b. Check radio set control and
b. Radio set control SENS
malfunction in receiver-trans-
receiver-transmitter by substitu-
control does not cut off
mitter.
tion; replace defective unit (paras
audio completely at fully
3-13 and 3-17).
counterclockwise
position (C-4677/ARC-
51X only).
Defective SQ DISABLE switch,
Check radio set control and
7
SQ DISABLE switch does
receiver-transmitter by substitu-
or malfunction in receiver-
not function properly
t i o n (paras 3-13 and 3-17).
transmitter.
(C-6287/ARC-51BX
only).
Headset audio level cannot
8
Defective radio set control VOL
Replace radio set control (para
be controlled by radio
control.
317) ; higher category mainte-
set control.
nance required.
No audio tone in headset
Fault
in
receiver-transmitter.
9
Replace  receiver-transmitter  (para
during channel-changing
313) ; higher category mainte-
cycle.
nance required.
Preset channel selection
10
Check radio set control and
Defective radio set control or re-
inoperative (C6287/
receiver-transmitter by substitu-
ceiver-transmitter.
ARC-51BX only).
t i o n (paras 3-13 and 3-17).
11
a. Defective
Transmitter power output
receiver-transmitter
a. Replace receiver-transmitter
indication is less than
(para 3-13); higher category
16 watts.
maintenance required.
b. Replace reflectometer (para
b. Defective reflectometer . . . . . . .
316); higher category mainte-
nance required.
Reflected power indication
12
a. Replace receiver-transmitter
a. Defective receiver-transmitter
is more than 5 watts.
(para 3-13) ; higher category
maintenance required.
b. Improper cable connections be-
b. Check antenna cable connections;
tween receiver-transmitter and
replace defective cable.
uhf antenna.
c. Replace reflectometer (para
c. Defective  reflectometer-------------
3-16) ;  h i g h e r category mainte-
nance required.
13
No sidetone audio in head-
Replace  receiver-transmitter  (para
Defective
receiver-transmitter
set during transmission.
313) ; higher category mainte-
nance required.
14
Radio set fails to provide
Replace  receiver-transmitter  (para
Defective receiver-transmitter . . . .
two-way communications
3-13) ; higher category mainte-
with base control tower,
nance required.
or other uhf receiver-
transmitter, on all
assigned test frequencies.
3-5

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