TM 11-5805-424-15/NAVSHIPS 0967-220-9010/TO 31W2-2G-41
c. Troubleshooting Chart-Continued
Item
Symptom
Probable trouble
Corrective measure
No.
24
Improper operation when
a. Defective talk-request detector
a. Troubleshoot talk-request detector
order-wire talk-request
module:
module as follows:
signal is received.
(1) Defective amplifier IN-16 on
(1) Check amplifier (para 6-7a);
assembly A10 (fig. 8-15).
replace defective components
(2) Defective initial timer Q2, Q3,
(2) Check for +6 volts at the collec-
Q4.
tor of transistor Q4 on PC
80034040 (fig. 6-11) at the time
of talk-request generation. If not
present, take voltage and resist-
ance measurements of the initial
timer (Q2, Q3, and Q4 circuitry,
components.
(3) Defective window timer Q5, Q6,
(3) Check for +-6 volts at the collec-
Q7.
tor of transistor Q7 on PC
80034040 (fig. 6-11), approxi-
mately 1 second after the talk-
request is generated, then check
for a ground approximately 3/4 of
a second later. If the voltage in-
dications are not correct, take
voltage and resistance measure-
ments of the window timer (Q5,
Q6, and Q7) circuitry, fig. 6-37);
replace defective components.
(4) Defective amplifier IN-17
(4) Check amplifier (para 6-7a);
replace defective components.
(5) Defective AND gate GAD-3
(5) Check AND gate (para 6-6c);
replace defective components.
(6) Defective amplifier IN-18
(6) Check amplifier (para 6-7a);
replace defective components.
(7) Defective bistable FFB-1
(7) Check bistable (para 6-5);
replace defective components.
(8) Defective amplifier IN-19 or
(8) Check amplifier (para 6-7a);
IN-20.
replace defective components.
(9) Defective OR gate GOE-1
(9) Check OR gate (para 6-6d);
replace defective components.
(10) Defective AND gate GAS-5
(10) Check AND gate (para 6-6b);
replace defective components.
25
Order-wire circuit cannot be
a. Defective TALK REQUEST RE-
a. Check switch; replace, if defective
reset when TALK RE-
SET switch S4.
(fig. 8-28).
QUEST RESET push-
b. Defective feedthrough capacitor
b. Check capacitor; replace, if defec-
button is depressed.
C12 (fig. 6-29).
tive (fig. 6-29).
26
No transmit bit-timing signals
a. Defective risetime and falltime
a. Check for bit-timing signals at TP3
available.
shaper No. 2 on assembly A5 (fig.
of PC 80034150 (fig. 6-6). If not
present, take voltage and resist-
ance measurements of shaper
No. 2 (Q1, Q2, Q3, Q4 circuitry,
fig. -33); replace defective com-
ponents (fig. 6-6).
6-52
