Raytheon Beech Baron E55 - Page 407

Raytheon
Aircraft
BEECH
BARON
55
AND
58
SHOP
MANUAL
9.
Check
the
resistance
between
pins
6
and
7.
The
ohmmeter
should
indicate
112
138
ohms.
10.
Check
the resistance
between
pins
7 and
8.
The ohmmeter
should
indicate
23
27
ohms. The
plug
incor-
porates
a
resistor and
a
fuse
between
these
pins.
d.
Turn
the
airplane battery
master
switch
ON,
and
reset
the
propeller
synchronizer
circuit
breaker,
but
leave
the
control
box
unplugged.
e.
Using
the
do
voltmeter,
check that
the
voltage
between
pin receptacles
1
and
2
is
the
same as
the
supply
volt-
age,
and
the
polarity
of
pin
number
1
is
negative
while
that
of
pin
number
2
is
positive.
f.
Using
an
oscilloscope,
check
the
voltage
between
pins
5 and
1,
and
3
and
1.
With the
engine
operating
at
cruise
rpm,
the
oscilloscope
should
indicate
3.0
volts,
peak
to
peak.
The
voltage
should not
read less than
2.0
peak
to
peak,
at
minimum
cruise
rpm
nor
more
than
10.0
volts,
peak
to
peak,
at
maximum
cruise
rpm.
NOTE
These
readings
are
based
on
a
magnetic pickup/toothed
wheel
clearance
gap
of
approximately
0.005
inch.
If
adjustment
is
required,
refer
to
the Woodward
Test
Specification
SP-197
for
adjustment
procedures.
g.
When
the
system
is in
compliance
with
the
preceding
check
values,
plug
the
control
box
into
the
synchronizer
system
and
flight
check.
FLIGHT
CHECK
a,
Check
the
effect of
rpm
and/or
power
setting, particularly
in
the
lower
cruise
range
on
synchronizer
action.
If
operation
at
lower
rpm
results
in
improved
synchronization,
inspect
the drives
to
the
governors.
b.
Reduce
the electrical
load
and
turn
off
the
generator
and
all
other
electrical
units,
except
the
master
switch
and
synchronizer.
If
synchronizing
improves,
abnormal
voltage
spikes
on
the
airplane
bus
from
some
other
electrical
ac-
cessorl
may
have
been
upsetting
the
synchronizer.
Isolate
the
offending
accessory
and
repair
it.
If
the
trouble
lies
in
the
control
box,
replace
it.
8
6
4
2
WY~3
7´•
5
3 ´•1
VIEW OF
CONTROL
BOX CONNECTOR
SHOWING
NUMBERED TERMINALS
58P351-2
Synchronizer
Plug
Figure
7-2A
616
7-7