Beechcraft 20138 - Page 43

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WARI
MALFUNCTION
CAUSE REMEDY
No Output Output
voltage
adjustment
set
Readjust output
too low.
voltage.
Field
circuit fuse open. Replace
fuse.
Transistor Q7
open. Replace Q7.
Overvoltage
protection circuit Reset
over-
tripped, voltage
protection
circuit.
Relay contacts
dirty.
Clean
relay
contacts
Output
is
normal when
Overvoltage
circuit
set
Readjust
over-
engine is started but
too low. voltage circuit,
ceases after a short
time.
Output
voltage
set
too high. Readjust
output
voltages.
Overvoltage circuit Transistor Ql
and Q2 open.
Replace Ql or
Q2.
inoperative
at any
voltage.
Diode
CR3
shorted.
Replace CR3.
External
pin
connections not Check
external
pin
properly
madd. connections.
Zener
diode
CR2
open, Replace
CR2.
Relay
Kl
stuck.
Repair or replace
relay.
Continuous
high output Output voltage adjustment set Readjust output
too high. voltage.
Transistor
Q6
or Q7 shorted. Replace
Q6
or
Q7.
Transistor QS
shorted.
Replace QS.
Transistor
Q4
open. Replace
Q4.
Transistor Q3 open. Replace Q3.
Indicator
lamp fails Lamp burned out.
Replace lamp.
to light.
Relay
contacts
dirty.
Clean relay
contacts.
Bad ground
connection
at
Check ground
connection.
PAGE
4-13,
indicator lamp.