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Page Title:
Synthesizer Test Tray A3, Trouble Localization Chart |
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|  TM 11-6625-847-12
Item
No.
Trouble symptom
Probable trouble
Checks and corrective measure
9
With AN/PSM-6 dc test
a. Improper seating of input
a. Tighten power connector.
leads connected to XMIT
power connector.
IF AND AUDIO test
b. Defective XMIT IF AND
b. Higher category repair
points LO and HI, and
AUDIO TEST SELECTOR
required.
XMIT IF AND AUDIO
switch.
TEST SELECTOR
c. Defective external 28-volt
c. Higher category repair
switch set to 3, voltage
dc power supply.
required.
varies more or less than
limits of 0 to 20 volts
dc when XMIT IF AND
AUDIO ALC APC PPC
CONTROL POWER
CONTROL is rotated
from fully counterclock-
wise to fully clockwise.
4-20.
Synthesizer Test Tray A3, Trouble Localization Chart
The chart below specifies the performance required to be sure that tray A3 is operational.
Step
Control setting and
Performance standard and
No.
Operation of test equipment
operation of equipment
references
1
Insure that +27-volt dc
Set test set switches and controls
primary power is sup-
to settings listed in paragraph
plied to the test set
POWER connector.
2
Remove tray A3 from
storage case and install
in test set.
3
Set tray A3 switches and con-
trols to settings listed in par-
graph 3-13.
4
Set test set POWER switch to
Test set POWER indicator il-
ON, and SERV SEL switch to
luminates (para 421, item
STBY.
No. 1).
5
Set tray A3 POWER switch to
Tray A3 POWER indicator il-
ON.
luminates (para 4-21, item
No. 2).
6
Rotate test set MC FREQ select
Tray A3 MC SYNTH module
switches 10MC and 1MC from
coupler is adjusted to a new
2 me to 29 me in 1-mc steps.
setting each time MC FREQ
Observe tray A3 MC SYNTH
select switches 10MC and 1MC
module coupler (moves 12.8
are adjusted (para 4-21, item
per MC).
No. 3).
7
Set tray A3 POWER switch to
Tray A3 POWER indicator ex-
OFF, and test set SERV SEL
tinguishes.
switch to OFF.
8
Connect test equipment as
indicated in figure 4-2,
and apply operating
power to test equipment.
Secure the following
RT-662/GRC modules,
and install them in ap-
propriate connectors on
tray A3 (observe cou-
pled alignments):
a. 100 kc synthesizer Module
RT-662/GRC.
4-12
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