P-9-TM-457-35 T. O. 35C2-3-442-2
TM-07464A-35 TM 5-6115-457-34
4. If the current value (step 2 pre-
c. To isolate a malfunction of the en-
ceding) is met, measure voltage across
gine crank relay, place the start-run-stop
switch S2 in the START position and mea-
across terminals 1-2, and 3-4 should be
sure the voltage across A27K3 relay ter-
identical, if not transformer T1 is
minals as follows:
1. Voltage across Xl(-) and X2(+)
should read 20-32 VDC.
Disconnect all electrical plug connectors at
2. Voltage across Al or A2(+) to
TB2-1(-) should read 20-32 VDC.
then remove the four screws and nuts se-
curing the assembly in position. Remove
the mode I relay box assembly.
If the voltage is measured at Xl and
6-97. BENCH TEST.
A2, but not at Al, replace the relay.
d. To isolate a malfunction in the re-
active droop circuit, install a shorting plug
on paralleling receptacle J45, J46 or J47
located below the manual speed control
b. Connect the mode I relay box assem-
knob. Proceed as follows:
bly to test equipment as illustrated in
at 100 percent 0.80 PF load, position the
parallel switch S6 to the PARRALLE L
6-98. DISASSEMBLY, Refer to figures
position. Voltage measured across resis-
6-22 and 6-26, and disassemble the mode I
tor R1 located in this Mode I relay box,
relay box assembly in the order of index
as the reactive current rheostat R29,
numbers assigned. Pay particular attention
located on the Mode I relay box, is rotated
to the following.
counterclockwise should increase to
approximately 9 VAC, then decrease to 0
VAC as R29 is rotated full clockwise.
Disassemble the mode I relay box
2. If the voltage values (step 1
assembly to the extent necessary
above) are not met, connect a 0-3 amp am-
meter in series with current transformer
to accomplish repair.
CT7. Current measured should be approxi-
a. Remove ten screw assemblies (2,
mately 1.5 amperes at 100 percent, 0.8PF
(1) from chassis assembly (39).
3. If the current value (step 2
b. Tag, then disconnect harness wiring
and reactive current rheostat R29. If the
shunt (R13) engine cranking relay (K3),
sistance range 0-12 ohms.