Mooney M20R - Check Control Panel; Check Solenoid Valve

SERVICE
AND
MAINTENANCE
MANUAL
M20R
MOONEY
AIRCRAFT
CORPORATION
LevellV
Maintenance
Practice
(con’t.)
Procedures
Check
Solenoid
Valve.
Check
V~ndshield
Pump
as
detailed
above.
Re-
NOTE:
Solenoid
Valves
have
a
history
of
reliability.
It
connect
V~ndshield
Pump
to
Solenoid
Valve.
Oper-
is
recommended
that all
other
components
be
checked
ate
pump
be
pressing
’1MNDSHIELD"
switch
on
out
prior
to
further
troubleshooting
of
Solenoid
Valves.
control
panel.
Fluid
should
be
discharged
onto
the
windshield,
if
not,
disconnect
Nylon
tube
from out-
let of
Solenoid
Valve
and
repeat
test.
Fluid
should
be
discharged
from
outlet of
Solenoid
Valve.
If
not,
check
electrical
power
at
connections
to
Sole-
noid valve
(See
Figure
30-2)
when
pump
is
operat-
ing.
If
Solenoid
Valve
is
suspected
of
not
closing,
disconnect
electrical
power
to
the valve
and
oper-
ate
V~ndshield
Pump.
No fluid
should
be
dis-
charged
from
the
spraybar
(or
Solenoid
Valve
out-
let).
OR
2. Remove
Solenoid
Valve and
bench
test.
Check
Control
Panel.
1. Remove
screws
and
pull
Control
Panel out
as
NOTE:
Voltages
specified
in
Procedures are
based
on
far
as
wiring
will allow.
Use voltmeter
probe
to
a
voltmeter
with
a
resistance
of
at
least
10,000
ohms
measure
voltage
at
the various
pins
in connectors
per
volt.
Readings
marked
with
will differ
if
a
lower
re-
C! C2
on
rear
panel
(Figure
30-2
Schematic)
sistance
voltmeter
is
used.
[1]
Aircraft
Power
ON
all switches
OFF
All
pins
zero
volts
except:
C1
-3
to
be
aircraft
voltage.
C1 -2
to
be 7.5
volts
C2
-1
to
be
5
volts.
C2 -2 to
be
between
zero
and
2
volts"
(depending
on
tank
contents)
C2 -3 to
be
5 volts.
[2]
As
[Ij
but
with
MAXIMUM
selected.
All
pins
zero
volts
except:
C1
-3,
-5
to
be
aircraft
voltage.
C1 -2
to
be
7.5
volts"
initially,
changing
to
zero as
pressure
rises.
All
pins
on
connector
C2
as
[1].
[3]
As
[1]
but
with
NORMAL
selected.
All
pins
zero
volts
except:
C1
-3,
-4
to
be
aircraft
voltage.
C1
-2
to
be
7.5 volts"
initially,
changing
to
zero as
pressure
rises.
All
pins
on
connector
C2
as
[1].
[4]
As
[1]
but
with
WINDSHIELD
1
selected.
All
pins
zero
volts
except:
C1
-3, -6,
-8
to
be aircraft
voltage.
C1
-2
to
be
7.5
volts".
All
pins
on
connector
C2
as
[1].
[5]
As
[1]
but
with
V\IINDSHIELD
2
selected.
All
pins
zero
volts
except:
C1
-3,
-9,
-11
to
be
aircraft
voltage.
C1
-2
to
be
7.5
volts".
All
pins
on
connector
C2
as
[1].
OR
2. Remove
Control
Panel and
bench
test.
REV.
7-96
30-12-02
Island Enterprises