TM 11-5805-424-15/NAVSHIPS 0967-220-9010/TO 31W2-2G-41
c. Troubleshooting Chart-Continued
Item
Symptom
Probable trouble
Corrective measure
No.
d. Defective equalizer circuit on
d. Check for input fsk signal at pins
assembly A235A (if used)
N and G of PC 80034230 (fig.
(fig. -25).
6-25); if not present, take
voltage and resistance measure-
ments of Q1 circuitry (fig. 6-41),
and replace defective components.
Check for fsk signal at pins U
and V of PC 80034230 (fig.
and resistance measurements of
Q2-Q3 circuitry (fig. 6-41), and
replace defective components.
Check for fsk signal at test jack
J2 on assembly A25A3 (fig. 6-25);
if not present, take voltage and
resistance measurements of Q4
circuitry (fig. 6-41), and replace
defective components.
23
Improper operation when
a. Defective talk generator circuit
a. Troubleshoot talk generator circuit
order-wire circuit operation
as follows:
is initiated.
(1) Defective amplifier IN-25 on
(1) Check amplifier (para 6-7a);
PC 80034140.
replace defective components
(2) Defective OR gate GOA-6
(2) Check OR gate (para 6-6d);
replace defective components.
(3) Defective bistable FFE-1 or
(3) Check bistable (para 6-5);
FFF-1.
replace defective components.
(4) Defective 1.5-second delay cir-
(4) Check for - 15 volts at TP4 of
cult QS, QG, Q7.
PC 80034140 (fig. 6-4); if not
present for approximately 1.5
second after talk-request is
initiated (signal returns to
ground after 1.5 second), take
voltage and resistance measure-
ments of 1.5-second delay (Q5,
Q6, Q7 circuitry, fig. 6-32).
Replace defective components.
6-51
