Cessna 182 1978 - Control Wheel Map Light; Dome Light; Map Light; Transistorized Light Dimming

MODEL 182 & T182 SERIES SERVICE MANUAL
16-79A.
TROUBLE
SHOOTING
- POSTLIGHTING.
CONT.
ONE SECTION
OF LAMPS
Defective
rheostat.
3. Check
voltage
at output
side of
WILL NOT
LIGHT. Cont.
rheostat
with
battery switch
on.
Should read
battery voltage
with
rheostat turned full clockwise.
voltage
should
decrease
as rheo-
stat is turned counterclockwise.
If no voltage
is present or
volt-
age
has a sudden
drop
before
rheo-
stat
has been turned
full counter-
clockwise replace rheostat.
ALL LAMPS
OUT.
Open circuit
breaker.
1. With
battery
switch
on, check
circuit breaker. Reset if open. If
circuit breaker is set, check volt-
age
at output side
of breaker. If
no voltage is present, replace cir-
cuit breaker.
LAMPS WILL
NOT DIM. Defective resistor or rheostat.
1. Check resistor and rheostat
for
continuity
and resistance
value.
Also, check
transistors for
partial
short. Refer
to paragraph
17-90B.
Replace rheostat and transistor.
16-80.
TRANSISTORIZED
LIGHT
DIMMING.
16-83.
DOME
LIGHT.
16-81. DESCRIPTION.
The light
dimming circuit
16-84. DESCRIPTION.
The dome
light is
mounted
consists
of
a two-circuit
transistorized
dimming
aft of the
overhead
console.
The assembly
consists
assembly,
mounted on
the right hand
side of
the cabin
of a housing
a socket
and lamp
and a cover.
The
forward
of the instrument
panel,
and two controls
on
light is
controlled
by a slide
switch mounted
on the
the lower
left
hand side
of the
panel.
The left
control
cover
aft of
the light.
is
a dual rheostat
with a
concentric
knob
arrangement
The center
portion
controls
lower
panel lighting,
the
16-85.
REMOVAL
AND INSTALLATION.
See
outer
portion controls
engine instrument
and radio
figure
16-9. for
removal
and installation.
lighting.
The right
hand
is
a single
rheostat
and
con-
trols
instrument
lighting,
this
includes,
glare shield
16-86.
MAP
LIGHT.
lights, instrument flood lights, compass light and
post
lighting
if installed.
16-87.
DESCRIPTION.
A
light assembly
is
installed
in the
instrument
panel
galre
shield
above
the pilots
16-82.
REMOVAL
AND
INSTALLATION.
See
control
wheel.
The
light has
a blue
lens.
A switch
figure
16-11
for
removal
and
installation.
located
forward
of the
light
control
the
light.
16-82A. TROUBLE SHOOTING
- TRANSISTORIZED 16-88. REMOVAL
AND INSTALLATION. See
HEAT SINK.
Remove heat sink from airplane. Check
figure 16-10 for removal and installation.
transistors
for
opens
and shorts,
check
transistor
soc-
kets
for evidence
of shorting
out
against heat
sink,
16-89.
CONTROL
WHEEL
MAP LIGHT.
especially
on
the bottom
side.
Check
that
legs
of
transistor socket have
not been bent up against
heat
sink.
If this
has
happened,
you may
see
burned
spot
16-90.
DESCRIPTION.
The
control
wheel
map light
on
the socket
leg.
If the
transistor
sockets
and
wiring
is internally
mounted
in
the control
wheel.
A
rheostat
appear
to
be in
good
condition,
install
transistor
back
located
on
the
lower
right
hand
side
of the
wheel
con-
in heat
sink and
make
a continuity
check.
Attach
one
trols the
light.
lead
of an
ohmmeter
to
the heat
sink
then check
every
pin
of the
pigtail
plug
with
the
other
lead for
16-91.
REMOVAL
AND
INSTALLATION.
(See
continuity.
(These
should
not be
continuity).
If con-
figure 16-13.)
To
remove,
push upward
on the
lamp
tinuity
is found,
this
will burn
out transistors
im-
and
turn.
The
lamp
and
reflector
is replaced
as
a
mediately,
unit.
16-48A/(16-48B
blank)