Beechcraft 20138 - Page 32

O :
a)
Monitor
the buss
voltage with the
voltmeter.
b) Remove
the white
dust cover from
the
"regulator" adjustment
hole on
the
finned surface of
the regulator
(See
Figure
4-1),
c) With
the engine running, insert the screwdriver and
adjust
until
the
voltmeter reads
28.5 volts
±0.25 volt (or whatever
other voltage is
desired,
within the range
of
26.7 to 34.0
volts D.C.)
d) Remove
the screwdriver
and replace the
white
dust cover
and
remove
the voltmeter.
Overvoltage:
This
adjustment should
only
be performed
in
the
aircraft in
cases
of
the
most
extreme
necessity,
because an
error
in following
the procedure could result in damage to
aircraft
electrical
equipment. Refer
to the
CAUTION
notice
below.
CAUTION
This adjustment is preset at
the
factory
and
should
be
readjusted
in
the
aircraft
only in cases
of
extreme
necessity.
It is imperative that
all electrical equipment
in
the aircraft be
disconnected from the buss
(by
removing fuses,
by tripping the
circuit
breakers,
or
by
removal of the
equipment
from
the aircraft)
before
beginning the
following
procedure. The
reason for
these
precautions revolves
simply
around
the
need
to
raise the
buss
voltage to
at
least 32,0 volts in order
to
set
and
test
the overvoltage
circuitry for correct operation.
If other equipment were connected
to the
buss
during this operation,
it
might be
damaged by the higher than
normal
voltage.
4-2