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 TM 11-6625-667-45/NAVSHIPS 0969-249-8010/NAVAIR
16-30APM123-2/TO 33A1-3-367-22
Probable trouble
Corrective measures
Symptom
Transistor A16Q2----------------------------
Check A16Q2; use voltage and resistance
No RF power with A4TP4
grounded, but normal with
diagram.
A4TP5 grounded.
a Adjust transmitter (para 4-4).
Low RF power output With test a. Electron tube filament voltage
point A4TP5 or A4TP4
abnormal, or transmitter adjust-
ment required.
grounded.
b. Check stages in order given; use socket
b. Transistors and tubes:
voltage and resistance diagram.
(1) A16Q3, A16V1, A16V2, or
A16A1V1.
(2) A16Q1; A16Q2; A16A2Ql-
A16A2Q3.
Check A16Q1; use socket voltage and resist-
Al6Q----------------------------
Low power output, below -8
ance diagram.
dbm, with test point A4TP5
grounded, but normal (-21
1 dbm) with A4TP4
grounded.
a. Adjust P2 pulse level control A16R6 to
a. P2 pulse level adjustment ----------
Low power output below 20
obtain normal power.
dbm with test point A4TP4
b. Check A16Q2; use socket voltage and
b. Transistor Al6Q2----------------
grounded, but normal (-9
resistance diagram.
1 dbm) with A4TP5
grounded.
Refer to encoder modules A4 and A5 trouble-
Module A4 or A5--------------------
Pulses not present at test point
shooting chart in f below.
A16TP1.
Adjust control A4R41 (fig. 3-7) to obtain
P1 and P3 RF pubes not within Pulse width adjustment, module A4- --
specified RF pulse width for P1 and P3
0.8 sec 0.2.
I
pulses.
Adjust control A4R41 (fig. 3-7) to obtain
P2 RF pulse width not within
Pulse width adjustment, module A4- --
specified RF pulse width for P2 pulse.
0.8 sec 0.2.
Refer to paragraph 4-4.
P1 and P3 spacing abnormal in
Adjustment-------------------------
any mode.
Adjust A4 R22 for normal spacing.
P1 and P2 spacing not within
Adjustment of A4R22------------
2 sec 0.2.
Refer to troubleshooting chart in f below.
Encoder module A4------------------
Transmitter operating during
Look for symptom described as encoder
receiver cycle.
enable locked in set state.
and 8-36 (test points) for waveforms. Voltages and resistances are given in figures 3-11 (module A4)
and 3-12 (module AS). Schematic diagrams are figures 8-8 (A4) and 8-9 (A5).
Corrective measures
Probable trouble
Symptom
No pulse present at test point
P1-P3 shaper 1SS4 or modulator
check resistances at A4Q9 and A4Q1O.
A4TP6, but a pulse is present
driver A16Q1.
If normal, proceed with b below.
at test point A16TP1 (ISLS
b. Set ISLS switch ON and observe whether
switch OFF).
pulse is present at A4TP6. If present,
check diode A4CR16 and replace if
defective. If pulse is not present, check
transistor A4Q11 and diode A4CR17.
3-17
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