Quantcast Localizing Troubles - TM-11-6625-564-450031

 

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Resistance and Continuity Measurements - TM-11-6625-564-450030
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TM-11-6625-564-45 Maintenance Kits Electronic Equipment MK-731/ARC-51X Manual
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Radio Set Simulator Troubleshooting Chart.
TM 11-6625-564-45
Switch
Position
Terminals
Resistance
Figure
(ohms)
POWER
OFF
2-7
El of 1A1 to 1 of HEADSET H-
0
101A/U jack J4.
0
TEST SELECT OFF
2-7
E2 of 1A1 to 3 of HEADSET H-
101A/U jack J4.
0
E4 of 1A1 to U of J2--------------------------
2-7
0
E5 of 1A1 to R of J2 ---------------------------
2-7 and 2-1
0
E6 of 1A1 to ground ----------------------------
2-7
E1 of 1A2 to V of J2 --------------------------
POWER
OFF
2-9 and 2-1
0
TEST SELECT OFF
2-9 and 2-1
E2 of 1A2 to E of J2---------------------------
0
2-9 and 2-1
E4 of 1A2 to 2 of HEADSET H-
0
101A/U jack J4.
2-9 and 2-1
E5 of 1A2 to 4 of HEADSET H-
0
101A/U jack J4.
2-9
E6 to 1A2 to ground -----------------------------
0
E7 of 1A2 to ground ---------------------------
2-9
0
2-9
E7 of 1A2 to E8 of 1A2 -------------------------
10,000
2-9
E7 of 1A2 of E9 of 1A2. (Rotate
0 to 10,000
AUDIO GAIN control to note var-
iation in resistance.)
2-9
E8 of 1A2 of E9 of 1A2. (Rotate
0 to 10,000
AUDIO GAIN control to note var-
iation in resistance.)
shown in figures 2-13 through 2-16 and 4-13.
2-5. Localizing Troubles
The radio set simulator chassis resistance and
a. General Instructions.
In the trouble-
continuity measurements are given in para-
shooting chart in b below, procedures are out-
graph 2-4c. If operational symptoms are not
lined for localization of trouble by operation
known or if they indicate possibility of short
of the radio set simulator with the test unit in
or open circuits, perform the resistance and
a self-testing mode. Connect the equipment as
continuity tests given in paragraph 2-4c be-
shown in the interconnecting block diagram in
fore proceeding.
figure 3-1 in TM 11-6625-564-12. The ra-
dio set simulator parts locations are, in figures
Note: If the symptoms indicate trouble in one of the
2-1 through 2-12. The radio set simulator
audio amplifiers 1A1 or 1A2, proceed to c below before
voltage and resistance measurements
are
making voltage and resistance measurements.
b. Radio Set Simulator Troubleshooting Chart.
Step No.
Symptom
correction
Probable trouble
Lamps may be burned out.
Indicator lamps
Replace lamps.
do not light.
2
a. +27.5 VDC lamp does
a. POWER switch CR1 is defective. a Replace switch CB1.
not light.
h. XMIT LOAD switch S4 is de-
When
b. XMIT LOAD lamp does
h. Replace XMIT LOAD switch S4.
lamps
not light.
fective.
are
XMIT LOAD thermostat S5 is
Replace XMIT LOAD thermo-
not
defective.
stat S5.
burned
Resistor R19 is defective.
Replace resistor R19.
out.
Power switch CB1 is defective.
Replace switch CB1.
22

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