TM 11-5821-284-34
refer to the corresponding item of the troubleshooting
Performance Standards, item 2 to test 5-5 etc, this
chart when a fault is observed. Item I in the
relation is maintained throughout the troubleshooting
troubleshooting chart corresponds to test 5-4 in the
chart.
4-5.
Troubleshooting Chart
Sequence
Doe
Trouble Symptom
Probable Cause
Corrective Action
No.
Test
1
5-4
Incorrect voltage between
Defect In phase discriminator
Check A2CR1, A2CR2, and
FL1 and FL6.
associated components. If
L3 has been replaced, adjust
the turn spacing of the wires
around toroidal core L3E1
to obtain 0.4 to 1.0 volt
positive at FI, 1 with respect
to FL5. Apply adhesive
(Armstrong A12 and A12T)
to cement wire to the core
and core spacer MP24 (figure
6-6). Keep adhesive off an-
tenna element MP13.
2
5-5
Incorrect waveform at J2-K
Defect in servo amplifier,
Check FL1, FL5, and AlR9.
when RF is applied to
pulsing, sequencing, servo
Perform individual test of
coupler
control or servo motor cir-
each circuit to isolate trouble.
cuits Defect in FL1, FL5
or A1R9.
3
5-6
Incorrect waveform at FL6
Defect in servo amplifier,
If results of items 2 and 4 were
when 100 mv is applied
or pulsing circuits.
abnormal check servo amplifier
to servo amplifier at FL1
and pulsing circuits.
4
5-7
Incorrect waveform at J2-K
Defect In servo amplifier
If one planarity is normal and
when 100 mv is applied to
or pulsing circuit &
the other is not, check AliCR14,
servo amplifier at FL1 and
AICR15, and associated
FL5
components.
If neither polarity is correct
check A1AR1 and pulsing
circuit.
5
5-8
Antenna does not cycle
Defect In receive/transmit
Check ALQ13 and associated
normally when F1A4 is
logic circuits.
components.
grounded.
6
5-9
a. Capacitor does not run
Defect In homing circuit
Check S2, A1ASC, A1A5D,
completely out when S2
logic
A1Q17, A1CR16, A1CR17,
is tripped
AlCR18, AlA6, and a5so
elated components.
b. Capacitor does not run
Defect in homing circuit
Check S1, AlA5C, A1A5D,
completely in when S1
logic.
A1Q117, A1CR16, A1CRI7,
is tripped.
AlCR18, A1A6, and associated
components.
7
5-10
a. Voltage at pin 2 of cir-
(1) External supply
Check external supply voltage
cuit board Al is above
voltage incorrect
and adjust for +27.5 Vdc.
(2) Internal short in +27.5
Check AiC10
Vdc line
b. Voltage at pin 5 of circuit
Short or open in +6.2
If voltage is high check A1CR22
board Al is above or
Vdc line.
and ground connections for
below +6.2 Vdc
open circuits.
If voltage is low check A1CR22,
A1C8, A1C3 and A1AR1, for
short circuits. Check A1CR21
and A1R33 for open circuits.
c. Voltage at AlARI-10 is
Short or open in +13.7 Vdc
If voltage is high, check
above or below +13.7
line.
A1CR21 and A1CR22 for open
Vdc.
circuits.
4-2
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