Mooney M20K - Page 95

SERVICE
AND
MAINTENANCE
MANUAL
M20K
MOONEY
AIRCRAFT
CORPORATION
(ANNUNCIATOR
TROUBLE
SHOOT1NG
(S~
25-0001
thru
25-1224)-
conY.)
13.
The
"right
low
fuel"
lainp
flickers
on
and
off
dun’ng
flight.
S1
(Assy
Al)
is
in
"Cal"
position
instead
of"Norm"
position
An
intermittent
ground
on
the
wire
from
P1-8
(Assy
Al)
to
the
gauge
C3
~Assy
Al)
defective
14.
The
"right
low
fuel"
will
not
light
dun~ng
YEST
only
when
the
right
fuel
tank
is
full.
R10
(Assy
Al)
should
be
replaced
with
a
47K,
114
watt,
50~
resistor
i 5.
The
"right
low
fuel"
orthe
"left
low
fuel"
lamps
light
before a
low
fuel
situation
has
occured.
Recalibrate
the
appropn’ate
channel
CR1
(Assy
Al)
open
18.
Both
the
"left
low
fuel"
and the
"right
low
fuel"
channels
stay
dim
when
they
annunciate
a
low
fuel
situation or
during
’7EST".
03
(Assy
Al)
defective
05
(Assy
Aidefective
U2CAssyAl
defective
04
(Assy
Al)
defective
CR22
(Assy
Al)
and
CR23
(Assy
Al)
open
17.
Neither
the
"left low
fuel"
nor
the
"right
low
fuel"
lights
dun’ng
’ITEST".
CR1
(Assy
Al)
shorted
U1
CAssy
Al)
defective
i8.
The
"high
low
vac"
lamp
will
not
light
during
’7EST’
but
does
annunciate
a
high
or
low
vacuum
situation.
CR14
CAssy
Al)
open
19.
The
"high
low
vac"
lamp
will
not
light
dun’ng
’ITEST’
or
in
a
high
or
low
vacuum
situation.
Filament
of
DS5
(AssyA2)
open
07
(Assy
Al)
defective
20. The
"high
low
vac"
lamp
will not
light
in
a
low
vacuum
situation
but
does
light
in
a
high
vacuum
situation.
08
(Assy
Al)
defective
CR12
and/or
CR13
(Assy
Al)
open
21. In
a
low
vacuum
situation
the
"high
low
vac"
lamp
lights
but
does not
flash.
CR16
(Assy
Al)
open
08
(Assy
Al)
defective
U2
CAssy
Al)
defective
CR1
(Assy
Al)
shorted
22.
The
"high
low
volts"
lamp
will
not
light
dun’ng
’ITEST’
or
in
a
high
or
low
voltage
situation.
Filament
of
DS6
CAssy
A2)
open
Q10
(Assy
Al)
defective
09
(Assy
Al)
defective
23.
The
"high
low
volts"
lamp
will
not’’TEST’
but does
annunciate
a
low
or
high
voltage
situation.
CR20
~Assy
Al)
open
24.
The
"high
low
volts"
lamp
lights
but
does not
flash in
a
low
voltage
situation.
CR17
~ssy
Al)
open
08
(Assy
Al)
defective
U2
(Assy
Al)
defective
25.
The
"high
low
volts"
lamp
will not
light
in
a
over
voltage
situation
CR21
(Assy
Al)
open
28.
The
"high
low
volts"
lamp
flashes
before
a
low
voltage
situation
has
occured.
R42
(Assy
Al)
out
of
calibration
U2
(Assy
Al)
defective
CR1
(Assy
Al)
open
27.
The
"high
low
volt"
will
not
light
in
a
low
voltage
situation.
R42
(Assy
Al)
out
of
calibration
U2
(Assy
Al)
defective
CR19
(Assy
Al)
open
08
(Assy
A?)
defective
CR1
(Assy
Al)
shotted
28.
The
"alt
air"
will
not
light
during
’ITEST’
or
in
normal
operation.
Filament
of DS8
(Assy
A2)
open
CR6
and
CR7
(Assy
A2)
open
24-3405
17
OLDWILLWAYNE