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TROUBLE, SYMPTOM
AND CONDITION
GENERATOR AND EXCITATION CIRCUIT (CONTINUED)
1. No (or low) gen-
erator output volt-
age in all phases.
Generator operating
at 400 Hz in AUTOMATIC
mode.
(Cont'd)
2. No (or low) output
voltage when operating
in MANUAL mode
August 5/89 Revised
PROBABLE CAUSE
(4) Defective Amph-
enol connector at
voltage regu-
lator, or defec-
tive wiring from
regulator to
exciter field.
(5) Defective voltage
regulator
A. Defective generator
manual control excitation
circuit.
Trouble Shooting Chart (Sheet 11 of 20)
Figure 5
TEST, CHECK, AND/OR
REMEDY
(4) Disconnect voltage reg-
ulator Amphenol connec-
tor (See TM-759 or OM-2020).
Using jumper leads
with clip and prod terminals,
connect 12-V DC
to terminals "E" and "C"
in loose plug. Connect
NEGATIVE to terminal "E"
Connect POSITIVE lead to
"C" terminal (see Fig.
6). If the generator
will NOT produce a normal
voltage, replace or
repair Amphenol connector
and wiring between
voltage regulator and
exciter field as re-
quired.
(5) All components in the
excitation circuit except
the voltage regulator
have been tested in
steps (1) through (4)
above. This leaves only
the regulator as a cause
of trouble. Replace complete
voltage regulator
A. Place AUTO-MANUAL control
switch (33, Fig. 1) in AUTO
position. If a normal voltage
is NOT produced, perform
checks as instructed in GEN-
ERATOR AND EXCITATION
CIRCUIT TROUBLE 1, above.
If a normal voltage is produced,
proceed to step "B" below.
OM-2031
3-1
Page 19
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