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OM-2031
TROUBLE, SYMPTOM
AND CONDITION
N0. 1 LOAD CONTACTOR OPERATING CIRCUIT (CONTINUED)
2. Load contactor (K1)
will close when
control switch (20,
Fig. 1) is held in
momentary ON position.
Opens immediately
when switch
is released to center
ON position.
3-1
Page 22
PROBABLE CAUSE
A. 28.5-V DC is not
reaching plug interlock
relay (K2) from
aircraft for the
following reasons:
(1) Generator to aircraft
cable connector
defective
or not plugged
into aircraft
receptacle connector
(2) Aircraft rejecting
power
B. "Blown" fuse (F2)
(1-1; 17, Fig. 8l) in
protective relay tray
C. Defective plug-
interlock relay (K2)
D. Small contacts in
load contactor (K1)
defective
Trouble Shooting Chart (Sheet 14 of 20)
Figure 5
TEST, CHECK, AND/OR
REMEDY
A. Check voltage at terminal Z
on test receptacle. Voltage
should be 28.5-V DC. If not,
voltage is not being supplied
from aircraft. Check
causes as follows:
(1) Inspect cable connector
plug thoroughly for damaged
E and F terminals.
Be sure the plug is
fully mated with the
aircraft receptacle connector
and making good
contact.
(2) Check aircraft on board
electrical equipment and
controls
B. Press the lens housing of
fault indicating lights. If
lamps do not glow, replace
fuse (F2).
C. Place test-bank switch (S2)
(34, Fig. 1) in ON position.
If load contactor will now
remain closed, replace the
plug-interlock relay (K2)
(Sect. 1-1; 1, Fig. 8) or
the complete protective
relay tray.
D. Connect a jumper lead be-
tween small terminal no. 1
and no. 2 on the load contactor.
If load contactor
will now remain closed, replace
the complete load contactor
August 5/89 Revised
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