Beechcraft TRAVEL AIR 95 Shop Manual page 95

TROUBLE SYSTEM EFFECT
PROBABLE
CAUSE
7. Field Discharge
Diode a. Shorted output
transistor
a. Reverse
battery
polarity,
Open and high system voltage b. Defective diode,
8. Back Bias Diode
Open
a. No Charge
a. Severe ground
at F
terminal
of
generator.
b.
Severe ground
in
wiring
between
F
terminals
of generator
and regu-
lator
-
c.
Generator
field completely
shorted,
d.
Defective diode.
9.
Back Bias Diode Shorted a. Poor switching
which would a.
F
terminal
of generator has been
cause shorted output
transistor
grounded.
b. Poor ground in system
or poor con-
nection at generator or regulator,
c.
Regulator
too
hot.
d. Ground in wiring between F
termi-
nals of generator and regulator.
e.
Defective
transistor,
f
.
Shorted field in generator.
g. Defective diode.
10. Transient Suppression a.
Output
transistor
may short a. Reverse battery polarity.
Diode
Open
from
transients
depends on b. High positive
transient
from
exter-
application
nal source.
11. Filter
Capacitor
Open
a. Poor
switching
may or may a. Defective
connection.
not fail
output
transistor
b. Defective capacitor.
12.
Feedback
Capacitor
a. High system voltage
a.
Defective capacitor.
Shorted
13.
Feedback
Capacitor Open
a. Poor switching
which could
a. Poor
connection.
cause shorted output
transistor
b. Defective capacitor.
14. Open resistor in negative
a.
High system voltage a. Defeative resistor or potentiometer
side of voltage divider.
Open negative side
of
potentiometer.
3-62