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|  Procedure
Indication
Probable trouble
Item
Make resistance and continuity checks
to isolate trouble in main frame (fig.
NO AM-65/GRC interphone
Faulty C-1439/U wiring; re-
Check C-1439/U for proper position of
3
mote cable; MT-1436/U
controls.
control from C-1439/U.
wiring; CX-4498/U.
Make resistance and continuity measure-
ments to isolate trouble to faulty wiring
in C-1439/U (fig. 30 and 35).
Check continuity and resistance from re-
mote cable connector through MT-1436/
U and CX-4498/U to isolate faulty
wiring.
No AM-65/GRC interphone
Refer to item 3 . . . . . . . . . .
Refer to item 3.
4
audio at C-1439/U.
No interphone input from
Refer to item 3. . . . . . . . . .
Refer to item 3.
5
AM-65/GRC amplifier
when speaking into
microphone at C-1439/
U.
AN/VRC-24 does not key
Faulty wiring in MT-1436/
Check resistance and continuity (fig.
6
U or CX-4498/U.
on retransmit.
AN/VRC-24 does not
Refer to item 6.
Refer to item 6 . . . . . . . . . .
7
modulate on retransmit.
tor, 500-kc if. amplifier, front panel, or
relay subunit. Faulty main frame wiring
a. General. With the rt unit operating
can also be the trouble. Use figure 36 as a
guide in troubleshooting the broadband
normally with the broadband switch at
circuits.
NOR, subunits in the rt unit that may be
faulty, causing defective broadband oper-
b. Broadband Operation Troubleshoot-
ation, are the audio amplifier and modula-
Procedure
Item
Indication
Probable trouble
Isolate trouble to audio amplifier modu-
Faulty V802 or associated
1
No audio output at BROAD
lator or 500-kc if. subunit by resist-
BAND connector terminal
circuit components, or
ance and continuity measurements (or
500-kc if. subunit ex-
E of J704 (encoded re-
replace V802) to isolate trouble (fig.
tended range output cir-
ceive).
cuit components.
Remove front panel (para 117) and make
Faulty main frame or front
continuity and resistance measurements
panel wiring.
to isolate faulty wiring.
Check V803 and circuit components by
2
No speaker or headset out-
Faulty audio amplifier mod-
stage gain measurements (para 100).
put when decoded signal
lator wiring or associated
Make resistance and continuity meas-
is coupled to BROAD
component.
urements to isolate fault in defective
BAND connector terminal
subunit.
A of J704 (decoded receive
Refer to last paragraph of
Refer to last paragraph of item 1.
af input).
item 1.
Check voltage from external source and
No relay voltage at BROAD
AN/VRC-24 will not key . . . .
3
correct abnormal condition.
BAND connector terminal
H of J704 (broadband key-
ing voltage).
Check subunit by continuity and resist-
Faulty wiring in audio ampli-
ance measurement (fig. 88).
fier modulator subunit.
Remove front panel (para 117) and make
Faulty front panel or main
continuity and resistance measure-
frame wiring.
ments to isolate faulty wiring (fig.
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