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Page Title:
Common Module Tray A2, Trouble Isolation Chart |
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|  TM 11-6625-847-12
Item
No.
Trouble symptom
Probable trouble
Checks and corrective measures
4
With AN/PSM-6 con-
a. Improper seating of input
a. Tighten power connector.
nected as described in
power connector.
items 2 and 3 above and
b. Defective RCVR IF TEST
b. Higher category repair re-
test set REC-XMIT
SELECTOR switch..
quired.
switch is set to XMIT,
c. Defective REC-XMIT switch.
c. Higher category repair re-
voltage is above 0 volt
quired.
dc .
5
With AN/PSM-6 con-
a. Improper seating of input
a. Tighten the power connector.
nected as described in
power connector.
item 4 above, RCVR IF
b. Defective RCVR IF TEST
b. Higher category repair re-
TEST SELECTOR
SELECTOR switch.
quired.
switch set to 3, test set
c. Defective test set SERV SEL
c. Higher category repair re-
SERV SEL switch set
switch.
quired.
to CW, and RCVR IF
BFO TONE control
rotated fully counter-
clockwise to fully clock-
wise, voltage on AN/
PSM- varies more or
less than limits of 19 to
21 volts dc.
6
With AN/USM-207 con-
a. Improper seating of input
a. Tighten power connector.
nected to test set IF OS-
power connector.
CILLATOR TWO
b. Defective RCVR IF TEST
b. Higher category repair re-
TONE OUT connector,
SELECTOR switch.
quired.
RCVR IF AGC SYNC
c. Defective test set SERV SEL
c. Higher category repair re-
switch to on and test
switch.
quired.
set IF OSCILLATOR
select switch to 1+2;
frequency observed on
AN/USM-207 varies
more or less than lim-
its of 1.7514 to 1.7516
mc.
7
With AN/USM-207 con-
a. Improper seating of input
a. Tighten power connector.
nected to test set IF
power connector.
OSCILLATOR TWO
b. Defective RCVR IF TEST
b. Higher category repair
TONE OUT connector,
SELECTOR switch.
required.
set RCVR IF AGC
c. Defective test set SERV SEL
c. Higher category repair
SYNC switch to on and
switch.
required.
test set IF OSCILLA-
TOR select switch to 1
+3; frequency observed
on AN/USM-207 varies
more or less than limits
of 1.7524 to 1.7526 mc.
8
When AN/PSM-6 de test
a. Improper seating of input
a. Tighten power connector.
leads are connected to
power connector.
XMIT IF AND AUDIO
b. Defective XMIT IF AND
b. Higher category repair
test points LO and HI,
AUDIO TEST SELECTOR
required.
voltage varies more or
switch.
less than limits of 10 to
c. Defective external 27-volt de
c. Higher category repair
21 volts de.
power supply.
required.
d. Improper seating of XMIT
d. Higher category repair
IF AND AUDIO connector.
required.
4-11
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