Slowly adjust R6 counterclockwise until
oscilloscope (M3) waveform begins to go
up from "minimum level" (curve 3, Figure
7-17). M1 reading shall go to "maximum
level" (35 VDC minimum) when waveform
passes through zero.
Adjust AC supply (PS1) to adjust (M2) to
136 VAC. The oscilloscope (M3)
waveform shall return to "minimum level"
and Ml shall read zero volts.
Without further adjustment of R6, repeat
the above procedure for the remaining
three conditions tabulated in Table 7-3. In
all cases, similar performance should be
ion one in Table 7-3 has already been accomplished in the previous
procedures. Procedures are repeated for the
remaining three conditions.
Table 7-3. Test Conditions.
he unit to meet adjustment requirements is indicative of a defective
(10) After all adjustments have been made, apply a
GRHVV, FSCM 80244) between the
adjustment screw head and housing
surfaces adjacent to screw head.
Cleaning, Inspection, and Repair.
Clean voltage regulator with compressed
air and a soft bristle brush.
Inspect voltage regulator for cracks,
damaged terminals, or other visible
For testing, refer to step a, Testing.
Repair of components identified
by testing as faulty is by component
Solder joints and/or component leads (except potentiometer leads) should not
project more than 0.125 in. beyond the surface of
Make sure that replacement transistor has
same identification number as the original
Apply heat sinks to the circuit board runs
Note and record position of transistor
leads and tab on transistor case in relation
to the printed circuit board.
Unsolder transistor from circuit board and
Place new transistor on circuit board.
Make sure emitter, collector, and base
leads are positioned as noted during
Solder transistor in accordance with MIL-
STD-454 Requirement 5. Trim transistor
Check that red, black, and white jumper
wires are properly positioned for the
generator output. Refer to Figure 7-15.
Place voltage regulator in control box and
Use tags for identification to connect leads
to voltage regulator.
Relays and Resistors
General (Model MEP-018A). Relays KI, K2, K3, and K4
furnish starting, stopping, safety and
operational control for the generator. The
relays are mounted on Printed Circuit
Relay K1 is used to start the generator
engine by energizing the starter solenoid
through the normally closed contacts of
7-14.6 Change 8