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Page Title:
Common Module Tray A1, Trouble Localization Chart |
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|  TM 11-6625847-12
Item
No.
Trouble symptom
Probable trouble
Checks and corrective measures
11
Adjustment of ALC
Defective SERV SEL switch -------------
Higher category repair required.
VOLTAGE TUNE con-
trol
12
Adjustment of ALC
Defective SERV SEL switch -------------
Higher category repair required
VOLTAGE. INFO con-
trol does not vary out-
put voltage from 0 to
22 volts de.
4-16.
Common Module Tray A1, Trouble Localization Chart
The chart below specifies the performance required to be sure that tray A1 is operational.
Step
Control setting and
Performance standard and
No.
Oration of test equipment
operation of equipment
references
Note. AN/PSM-6 is only
piece of test equipment re-
quired for following test.
1
Remove tray A1 from
storage case and secure
it to the test set.
2
Insure that +27-volt de
Set switches and controls on test
primary power is sup
set to positions listed in para-
plied to POWER con-
graph 3-10. Set switches and
nector on test set.
controls on tray Al to settings
listed in paragraph 3-11.
3
Rotate SERV SEL switch
Set test set POWER switch to ON.
Test set POWER indicator illum-
to SSB/NSK.
Set tray A1 POWER switch
inates (para 4-17, item No. 1).
to ON.
4
Measure dc voltage at DC/
+27 + 1 volts dc; tray A1
DC LOAD SELECT
POWER indicator illuminates
CONVERTER test con-
nectors between HI (+)
and LOW (-) with AN/
PSM-6.
5
Connect de test leads of
Set AGC OFF/ON switch to ON.
Measured voltage should vary
AN/PSM-6 to RF
Rotate RF AMPL AGC ADJ
from 0 to 28 volts de (para
AMPL AGC test connec-
control from fully counter-
tors TEST (-) and
clockwise to fully clockwise
(ground (+)).
6
Measure de voltage at
+20 + 1 volts de (para 4-17,
NOISE BLANKER
item No. 5).
NOISE BLANKER
20 VDC test connector
with AN/PSM-6.
Rotate test set MC FREQ select
Tray A1 mc shaft coupler should
switches 10MC and 1 MC
rotate and indicate 29 posi-
from 2.0 me to 29.0 me in 1-mc
tions selected (para 4-17, item
steps.
No. 6).
Note. As MC FREQ select
switches are turned clockwise,
mc shaft coupler advances 90
per 1-mc step.
8
Disconnect AN/PSM-6 ----------
Reset all switches and controls
Test set and tray A1 POWER
to settings listed in paragraphs
indicators extinguish.
4-7
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