TM 11-6625-2398-15-2
Step No.
Procedure
Normal indication
Corrective action
a. Check switch 1A1A1S1 and
4
Return RPM control to 0. Set
400-Hz circuit breaker remains on.
GROUP CASE POWER 60-Hz
GROUP CASE POWER in-
associated wiring.
b. Check circuit breaker 1A1A1CB2
circuit breaker to OFF. 400-Hz
dicator lamp lights.
circuit breaker to ON, and
and associated wiring.
GROUP CASE POWER
SELECT switch to 400 Hz.
5
Set POWER 60-Hz circuit breaker to
The 400-Hz circuit breaker remains
Isolate and replace defective part:
a. Circuit breaker 1A1A1A1CB4 or
OFF. 400-Hz circuit breaker to
on. The POWER indicator lamp
ON. and FREQUENCY
lights
associated wiring.
b. Interlock switch 1A1A1S15 or
SELECT switch to 400 Hz.
associated wiring.
c. Switch 1A1A1S4 o associated
wiring.
6
Set GROUP CASE POWER and
POWER switches to OFF.
Measure resistance between
1A1A1J10-H and ground. Set
EXT SIF switch to-
a. Meter indicates zero ohm.
a. Check switch 1A1A1S8 and
a. ON
associated wiring.
b. Meter indicates open circuit .
b. Check switch 1A1A1S7 and
b. OFF
associated wiring.
7
Measure resistance between
1A1A1J10-J and ground. Set
EXT M4 switch to--
a. Meter indicates zero ohm.
a. Check switch 1A1A1S8 and
a. ON
associated wiring.
b. Meter indicates open circuit.
b. Check switch 1A1A1S8 and
b. OFF
associated wiring.
8
Measure resistance between
1A1A1J10-D and ground. Set
SIF TAIL. switch to--
a. Meter indicates zero ohm .
a. Check switch 1A1A1S9 and
a. ON
associated wiring.
b. Meter indicates open circuit.
b. Check switch 1A1A1S9 and
b. OFF
associated wiring.
9
Measure resistance between
1A1A1J10-K and ground. Set
EXT MODE C switch to--
a. Meter indicates zero ohm.
a. ON
a. Check switch 1A1A1S10 and
associated wiring.
b. Meter indicates open circuit.
b. OFF
b. Check switch 1A1A1S10 and
associated wiring.
10
Measure resistance between
1A1A1J10-j and ground. Set
EXT TEST TGT switch to--
a. Meter indicates zero ohm.
a. ON
a. Check switch 1A1A1S11 and
associated wiring.
b. Meter indicates open circuit.
b. OFF
b. Check switch 1A1A1S11 and
associated wiring.
11
Measure resistance between
1A1A1J10-g and ground. Set
TRIG CONTROL switch to--
a. Meter indicates zero ohm.
a. ON
a. Check switch 1A1A1S12 and
associated wiring.
b. Meter indicates open circuit.
b. OFF
b. Check switch 1A1A1S12 and
associated wiring.
12
Measure resistance between
1A1A1J10-h and ground. Set
INHIBIT GATE switch to--
a. Meter indicates zero ohm
a. ON
a. switch 1A1A1S13 and associated
wiring.
b. Meter indicates open circuit.
b. OFF
b. Switch 1A1A1S131 and associated
wiring
4-5
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