TM 11-5805-424-15/NAVSHIPS 0967-220-9010/TO 31W2-2G-41
c. Troubleshooting Chart-Continued
Item
Symptom
Probable trouble
Corrective measure
No.
c. Defective receive data output
c. Troubleshoot receive data output
module assembly All (fig. 8-16):
module as follows:
(1) Defective AND gate GAI-3-
(1) Check AND gate (para 6-6a);
replace defective components
(2) Defective AND gate GAD-4 -
(2) Check AND gate (para 6-6c);
replace defective components.
(3) Defective amplifier IN-12
(3) Check amplifier (para 6-7a);
replace defective components.
(4) Defective bistable FFA-1
(4) Check bistable (para 6-5);
replace defective components.
(5) Defective AND gate GAS-4-
(5) Check AND gate (para 6-6b);a
replace defective components.
(6) Defective AND gate GAD-2 -.
(6) Check AND gate (par 6-6c);
replace defective components.
(7) Defective risetime and falltime
(7) Check for output data signal at
shaper.
TP6 of PC 80034030; if not
present, check resistors R6 and
R7 and transistor Q1. Check for
data output signals at TP7; if
not present, check resistor R9,
capacitor C8, and transistors
Q2 and Q7. Check for output
data signals at test jack J3 on
PC 80034030; if not present,
check resistors R10 through
R16, diodes CR6, CR8, and
C R9, and transistors Q3, Q8,
and Q9. Replace defective
components.
(8) Defective amplifier POD-1
(8) Check for output data signal at
test jack J3 on PC 80034030.
If not present, check amplifiers
Q3, Q8, Q9 circuitry (fig. 6-38);
replace defective components.
d. Defective ORDER WIRE RE-
d. Check jack; replace, if defective
CEIVE jack J2.
(fig. 8-28).
e. Defective feedthrough capacitor
e. Check capacitors; replace, if de-
C20 or C21 (fig. 6-29).
fective (fig. 6-29).
21
Receive carrier alarm not
a. Defective third input amplifierQ15
a. Troubleshoot third input amplifier
activated when receive in-
on assembly A9 (fig. 8-14) or
as follows:
put data is removed.
defective resistor A8R2 on
assembly A8 (fig. 6-9).
(1) Defective resistor A8R2
(1) Check for ground or slight pos-
itive voltage at test jack J3 on
PC assembly A8 (fig. 6-9). If
not present, check resistor
A8R2; replace resistor, if de-
fective.
(2) Defective third input amplifier
(2) Check for a negative voltage at
Q15.
TP2 of PC 80034050 (fig. 6-10).
If not present, take voltage and
resistance measurements of
transistors Q3 through Q6 and
Q15; replace defective compo-
nents.
6-49
