Cessna 182 1978 - Slip Ring Alignment; Timer Test; Trouble Shooting

MODEL
182 &
T182 SERIES
SERVICE
MANUAL
14-66.
TROUBLE
SHOOTING.
NOTE
The propeller
anti-ice
ammeter may
be used
while trouble
shooting
the system.
The ammeter
needle
should rest
within
the shaded band
except for
"flickers"
approximately
20
seconds
apart, as
the step
switch
of the
timer operates.
The
ammeter
will also reflect
a bad
connection
or open
circuit by reading
below
normal or
zero. A high
reading
indicates
a short
circuit.
TROUBLE
PROBABLE
CAUSE
REMEDY
ELEMENTS
DO NOT
Circuit
breaker
out
Reset circuit
breaker.
If it
HEAT.
or defective,
pops out again,
determine
cause and correct. Replace
defective parts.
Defective
wiring.
Repair
or replace
wiring.
Defective
switch.
Replace
switch.
Defective
timer.
Replace
timer.
Defective
brush-to-
Check
alignment.
Replace
slip ring
connection.
defective
parts.
SOME
ELEMENTS
DO
Incorrect
wiring.
Correct
wiring.
NOT HEAT.
Defective
wiring.
Repair
or replace
wiring.
Defective wiring.
Replace timer.
Defective
brush-to-
Check
alignment.
Replace
slip
ring connection.
defective
parts.
Defective
element.
Replace
element.
CYCLING
SEQUENCE
Crossed
connections
Correct
wiring.
NOT
CORRECT
OR
NOT
CYCLING.
Defective
timer.
Replace
timer.
RAPID
BRUSH
WEAR.
Brush
block
or slip
Align
properly.
FREQUENT
BREAKAGE.
ring
out
of alignment.
SCREECHING
OR
CHATTERING.
14-67.
TIMER
TEST.
When
correctness
of
the cycling
sequence
is estab-
a.
Remove
connector
plug
of wire
harness
from
lished,
turn
propeller
de-ice
switch
off at
the begin-
timer
and
jump
power
input
socket
of
wire
harness
ning
of
one of
the
on-time
periods,
and record
the
to
timer
input pins.
(Refer
to
chart
following
this
number
of
the pin
at which
the
voltage
supply
is pre-
paragraph
for
pin identification.)
sent.
b.
Jump timer
ground
pin
to ground.
c. Turn
on
de-icing
system.
TIMER
P/N
..............
C40171
d.
Check
timer
operation
per
the
chart.
(Use
a
POWER
INPUT
PIN ..........
1 (24VDC)
voltmeter.)
GROUND
PIN
..........
. 5 (24VDC)
e. Check
volts
to
ground
in each
case.
If engine
is
OUTPUT
SEQUENCE
2 sequences,
30
seconds
each
not
running.
and
auxiliary
power
is
not used,
voltage
(TIME)
will
be battery
voltage
and
cycle
time
may
be slightly
TIME
REPEAT
CYCLE
TIME
(SECONDS)
.. ..
60
longer
than
indicated.
f.
Hold
voltmeter
probe
on
pin
until voltage
drops
14-68.
SLIP
RING
ALIGNMENT.
After
installation.
to 0.
Move probe
to
next
pin in the
sequence
shown
the slip
ring
assembly
must
be checked
for run-out,
in
the
chart.
Check
voltage
at
each
pin in
sequence.
and
adjustments
made.
if necessary.
14-29