Cessna 172P - Page 256

9
AUDIO
CONTR,OL
PANELS
5.
8.
PILOT'S
OPER,ATING
HANDBOOK
SUPPLEMENT
Z. INTERCOM
VOLUME
CONTROL
(INT)
-
Controls
the intercom
audio
volume.
clockwise rotatlon
ofthe
knob
increases
the intorcom
a,udio volume
andoounter-
clockwise
rotation decreaeee
it.
3
4
6
?
HEADSET
SIDETONE
INTERNAL
ADJUSTMENT
ACCESS
- To
adjust
headset
sidetone,
removo
the
plug
button,
place
COM AUTO
selector
Bwltch
in
th€ PHONE
position,
insort a small
screwdriver
into
the &dju8tment
potontiometor
and rota,te
it
clockwise
to increase
tbo
aidetono
volume
or
counterolockwieo
to decrease
sidetone.
SPEAKER,
SIDETONE INTERNAL
ADJUSTMENT
ACCESS
-
To adjust
spea,ker
sidotons,
romov€
the
plug
button,
plaoe
COM
AUTO selootor
swltch
-ln
the
SPEAKER positlon,
insert
¿ emall
sorêwdrlv€r
into the adjustment potèntiome-
tor
ãnd rota,te
lt clookwlse
to increase
the
sidetone
volume
or
oounterõlookwlee to
decreaso
sidetone.
\ltlhile adlusting
eidetone,
be
aware
that
lf the sidetone
volume
level is set too
hlgh, audio
l€edback
(squeel)
rnay
result
when transmltting.
ANNUNCIATOR,
LIGHTS
BRIGHTNESS
SELECTOR
AND
TEST
SWITCH
(ANN
positi
level
Iights
NITE
adjusted down
to a
preset
mlnimum
uÊing
the RADIO
I¡T
dimming rheostatknob.
AUDIO SELÐCTOR
SWITCHES -
Three-position
eelector
switches used to
seleot
either
SPEAKER,
or PHONE
operation
for
aUdio outputs.
Enables
tho opera,tor to
select
any one or more,
audio
signals on
oither
SPEAKER
or
pHONE
at the samo
time or to
silence audio
when
placod
in the OFF
posltlon,
COMBOTHAUDIO
SELECTO
hree-posiüontoggle
switch
used to allow
both COM
e
same timo.
placing
the
COM BOTH
Ewitoh in the
I enable
the
pilot
to
monitor
both the number
1 and
the
SpEAKEH,
at
the
same time. Pla,cing
the
switch iu the
down
(PHONE)
posltion
allows the
pilot
to
monitor
both
the number 1 andnumber2
COM receivers
through
the headset a,t the
same time,
Center
(OFF)
posltion,
removoÊ
the non-eelected
COM receiver
(or
both
COM recelvsrs if
COM AUTO
swltch
ls OFF) from tho
audio system.
COM AUTO
AUDIO
SELECTOR, SÌI'ITCH
(COM
AUTO ON, AUTO) -
A thrEe-
position
toggle
switch
provided
to automa,tica,Ily
match the audlo
of
the
approp-
riate
NAV/COM
communications
receiver
to
the
transmitter
Belected by
tho
trensmitter
selector
switch. In
tho up
(SPEAKER)
positlon,
audio from the
selected receiver
will be he&rd
on the
eirplene
speakãr. In the
down
(PHONE)
position,
audio from
the
selected receiver
wlll be
heard through the
headset,
Center
(OFF)
position,
romoves
the automatic
SPEAKER/PHONE
solection
feature and will also
disable the
sidotone
foature.
6
TF,ANSMITTEF,
SELECTOR
SWITCH
(XMTR
SEL)
-
A
three-position
rotary
switch used to activote
the audio
amplifier a,nd
switch the
microphone to the
desired
trensmittor. The numbers
1,
2 and 3
positions
oorrespond
to the
.first,
second and third
(from
top to
bottom) trensmitterB,
reepectively.
Figure 1.
Audio
Control Panel
Operating Controls
(Sheet
2 o12)
9.
30
May
1980