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Page Title:
Common Module Tray A2, Trouble Localization Chart |
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|  TM 11-6625-847-12
Step
Control setting and
Performance standard and
No.
Operation of test equipment
operation of equipment
references
3
Set test set POWER switch to
Test set POWER indicator il-
ON.
luminates.
4
Rotate test set SERV SEL switch
Tray A2 POWER indicator il-
Note. Allow 10-minute
to SSB/NSK. Set tray A2
luminates (para 4-19, item No.
warmup period for test set
POWER switch to ON.
1).
frequency standard.
5
30 +2 volts dc (para 4-19, item
Connect AN/PSM-6 de
No. 2).
test leads to RCVR IF.
test connectors HI and
LO.
6
Set RCVR IF TEST SELECTOR
Dc voltage should vary from 0.35
switch to 2. Rotate RCVR IF
to 2.5 volts dc (para 4-19, item
RF GAIN control from fully
No. 3).
counterclockwise to fully clock-
wise
7
Observe AN/PSM-6 dc
Switch test set RC-XMIT switch
Dc voltage drops to 0 volt dc
voltage indication when
from REC to XMIT, then to
when REC-XMIT switch is set
test set RC-XMIT
REC.
to XMIT (para 4-19, item
switch is set to XMIT.
No. 4).
8
Set RCVR IF TEST SELECTOR
+20 + 1 volts dc (BFO TONE
switch to 3. Rotate test set
control has no effect on volt-
SERV SEL switch to CW.
age) (para 4-19, item No. 5).
Rotate RCVR IF BFO TONE
control from fully counterclock-
wise to fully clockwise.
9
Connect AN/USM-207 to
Set RCVR IF AGC SYNC switch
1.7615 mc + 100 cps (para 4-19,
test set IF OSCILLA-
to ON, and test set IF OS-
item No. 6).
TOR TWO TONE OUT
CILLATOR select switch to
connector (use HI gain
1+2.
preamplifier on AN/
USM-207). Refer to fig-
ure 4-1.
10.
Set test set IF OSCILLATOR
1.7525 mc + 100 cps (para 4-19,
select switch to 1+3.
item No. 7).
11
Measure dc voltage at
+ 20 + 1 volts dc (para 4-19,
XMTR IF AND AUDIO
item No. 8).
test points HI and LO.
12
Set XMTR IF AND AUDIO
Dc voltage should vary from
TEST SELECTOR switch to 3.
minimum of 0 volt do to maxi-
Set test set KEY switch to ON.
mum of +20 volts dc (para
Rotate XMTR IF AND AUDIO
ALC APC PPC CONTROL
POWER CONTROL from fully
counterclockwise to fully clock-
wise.
13
Disconnect all test equip-
Reset all switches and controls
Test set and tray A2 POWER
ment.
to positions listed in para-
indicator extinguish.
4-9
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