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Page Title:
Converter and Control Tray A4, Trouble Localization Chart |
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|  TM 11-6625-847-12
Item
No.
Trouble symptom
Probable trouble
Checks and corrective measure
does not increase when
10&1KC SYNTH OUT-
PUT VOLT ADJ control
is adjusted clockwise
6
With AN/URM-145 con-
a. Improper seating of power
a. Tighten power connector.
nected to 10&1KC
connector.
SYNTH SYNTH OUT-
b. Defective VOLT ADJ control.
b. Higher category repair re-
PUTS '10&1KC con-
quired.
nector, indication does not
increase when 10&1KC
SYNTH SYNTH OUT-
PUTS VOLT ADJ con-
trol is adjusted clock-
wise.
7
With AN/URM-145 con-
a. Improper seating of power
a. Tighten power connector.
nected to MC SYNTH1
connector.
OUTPUT MC SYNTH
b. Defective MC SYNTH OUT-
b. Higher category repair re-
connector, indication
PUT VOLT ADJ control.
quired.
does not increase when
MC SYNTH OUTPUT
VOLT ADJ control is
adjusted clockwise
4-22.
Converter and Control Tray A4, Trouble Localization Chart
The chart below specifies the performance required to be sure that tray A4 is operational.
step
Control setting and
Performance standard and
No.
Operation of test
operation of equipment
references
equipment
Note. AN/PSM- is the
only test equipment required
for the following test.
1
Remove tray A4 from
storage case and secure
to test set.
2
Insure that +27-volt de
Set test set switches and controls
primary power is sup-
to setting listed in paragraph
plied to test set POWER
connector.
controls to settings listed in
3
Set test set POWER switch to
Test set and tray A4 POWER
ON, and rotate SERV SEL
indicators illuminate (para
switch to STBY. Set tray A4
POWER switch to ON.
4
Connect AN/PSM-6 to test
Adjust test set DC VOLTAGE
set DC VOLTAGE +20
+20 control to obtain an AN/
test connector.
PSM-6 20-volt dc indication.
5
Press CONTROL TEST indca-
Each indicator should light when
tors A1 through A5, B1 through
pressed (para 4-23, item No.
B5, and C1 through C5.
2).
6
Connect AN/PSM- d
Rotate PA METER TEST AN-
Voltage should vary from -4 volts
leads across PA METER
TENNA LOAD/TUNE control
de to +3.6 volts de (para
TEST ANTENNA
from fully counterclockwise to
LOAD/TUNE test point
fully clockwise.
and ground.
7
Connect AN/PSM- de
Rotate PA METER TEST ALC
Voltage should vary from 0 volt
test leads across PA
METER control from fully
dc to +1.7 volts de (para 4-23,
METER TEST ALC
counterclockwise to fully lock-
item No. 4).
METER test point and
wise.
ground.
4-15
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