TM 11-6625-2398-15-2
Symptoms
Probable trouble
Correction
a. Same as step 3 above, items a and b.
a. Same as step 3 above, items a and
6 0-20 vac is not available between
b. Defective synchro 1A1A1A13B3.
b. Check synchro 1A1A1A13B3 and
1A1A1J10-P and -T when
1A1A1A13B3 is operating.
replace if defective.
c. Same as step 3 above, item d.
c. Same as step 3 above, item d.
d. Defective relay 1A1A1K1
d. Check relay 1A1A1K1 and
replace if defective.
e. Same as step 3 above, items g
e. Same as step 3 above, items g
through o.
through o.
CAUTION:
Before connecting test equipment, place all GROUP CASE POWER and POWER
switches to their OFF positions. Insert insulated extender pins (para 6-2e ) over connector pins
which will be monitored. Connect test equipment and set the GROUP CASE POWER and POWER
switches to the applicable positions.
Same as step 6 above, items a through e.
e. Same as step 6 above, items a
7 0-20 vat is not available between
through e.
1A1A1J10-T and -R when
synchro 1A1A1A13B3 is
operating.
CAUTION:
Before connecting test equipment, place all GROUP CASE POWER and POWER
switches to their OFF positions. Insert insulated extender pins (para 6-2e) over connector pins
which will be monitored. Connect test equipment and set the GROUP CASE POWER and POWER
switches to the applicable positions.
Same as step 6 above, items a through e.
Same as step 6 above, items a through e.
8 0-20 vac is not available between
1A1A1J10-P and -R when synchro
1A1AA13B3 is operating.
CAUTION: Before connecting test equipment, place all GROUP CASE POWER and POWER switches
to their OFF positions. Insert insulated extender pins (para 6-2e ) over connector pins which will be
monitored. Connect test equipment and set the GROUP CASE POWER and POWER switches to the
applicable positions.
a. Defective SYNC/RSLVR SEL
a. Check SYNC/RSLVR SEL
9 AZIMUTH DATA-FREQ
SELECT switch: 4000 SYN-
switch 1A1A1S6.
switch 1A1A1S6 and replace if
C / RSLVR SEL switch: SYNC
defective.
115 vac 1% is not present
b. Defective AZIMUTH DATA
b. Check AZIMUTH DATA FREQ
between 1A1A1J10-W and -X
FREQ SELECT switch
SELECT switch 1A1A1S5 and
when synchro 1A1A1A13B3 is
1A1A1S5.
replace if defective.
c. Defective relay 1A1A1K2.
c. Check relay 1A1A1K2 and
operating.
replace if defective.
d. Defective circuit breaker (s)
d. Check circuit breaker and replace
1A1A1CB1 through CB4. if defective.
10 Zero ohms is not indicated when
Defective ROTATION ENABLE
Check ROTATION ENABLE
1A1A1J12-D and -R are jump-
switch 1A1A1S2
switch 1A1A1S2 and replace if'
ered and a multimeter is con-
defective.
nected between 1A1A1J16-P
and -R. Hold ROTATION EN-
ABLE switch 1A1A1S2 momen-
tarily ON.
11 650 ohms 10% cannot be
Defective transformer 1A1A1T5.
(Check transformer 1A1A1T5 and
measured between 1A1A1J16-P
replace if defective.
and -R when ROTATION
ENABLE switch is released.
6-7. Isolation of Trouble in Group 2
a. calibration of the hybrid attenuator assembly every
The troubleshooting chart for the hybrid attenuator
provides a step-by-step procedure for troubleshooting.
90 days will hold faulty operation to a minimum since the
This procedure is based on the VSWR and insertion loss
periodic check will establish its operational capability.
b. In the event the hybrid attenuator assembly fails to
measurements.
c. General Support Troubleshooting Procedure,
perform properly, the cause of the malfunction must be
Hybrid
Attentuator
2A1.
determined
and
remedied.
6-9
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