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Page Title:
Common Module Tray A1, Trouble Isolation Chart |
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|  TM 11-6625-847-12
4-17.
Common Module Tray A1, Trouble Isolation Chart
Item
No.
Trouble symptom
Probable trouble
Checks and corrective measure
1
Test set POWER indicator
a. Defective external 27-volt de
a. Higher category repair re-
does not illuminate.
power supply.
quired.
b. Improper seating of input
b. Tighten power connector.
power connector.
c. Defective test set fuse-------------------
d. Defective indicator light ---------------
e. Defective POWER switch -------------
e. Higher category repair re-
quired
f. Defective test set SERV
f. Higher category repair e
SEL switch.
quired
2
+27 + 1 volts dc is not ob-
a. Defective DC/DC converter -----------
a. Higher category repair re-
tainable at DC/DC
quired.
LOAD SELECT CON-
b. Defective test set SERV SEL
b. Higher category repair re-
VERTER HI and LOW
switch.
quired.
test connectors.
3
Tray A1 POWER indi-
a. Broken or improperly seated
a. Repair or replace as required.
cator does not illumi-
connectors.
nate.
b. Defective indicator -----------------------
b. Check lamp by replacing it
with new lamp.
c. Defective POWER switch --------------
c. Higher category repair re-
quired.
4
Rotating RF AMPL AGC
a. Broken or imrpoperly seated
a. Higher category repair re-
OFF-ON control does
connectors.
quired.
not vary voltage from
b. Defective RF AMPL AGC
b. Higher category repair -
0 to 28 volts.
OFF-ON control.
quired.
c. Defective RF AMPL AGC
c. Higher category repair re-
OFF-ON switch quired.
5
20 volts dc not obtainable
Broken or improperly seated con-
Higher category repair required.
at NOISE BLANKER
nectors.
NOISE BLANKER 20
VDC test connector.
6
Me shaft coupler will not
Defective motor-------------------------------
Listen for motor operation; if
rotate or does not indi-
motor operation cannot be
cate one or all of 28
heard, higher category repair
positions selected by test
required.
MC FREQ select
switches.
4-18.
Common Module Tray A2, Trouble Localization Chart
The chart below specifies the performance required to be sure that tray A2 is operational.
Step
Control setting and
Performance standard and
No.
Operation of test
operation of equipment
reference
equipment
1
Remove tray A2 from
storage case and secure
it to test set.
2
Insure that +27 vac
Set test set switches and con-
primary power is supplied
trols to settings listed in para-
to connector on the test
graph 3-10. Set tray A2
set.
switches and controls to set-
tings listed in paragraph 3-12.
4-8
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