Front Panel Facilities - Pioneer SA-950 Service Manual

2.FRONT PANEL FACILITIES
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@ POWER SWITCH
When this switch is pushed, the power is supplied
(the function indicators light). When it is pushed
again, the power is switched off.
@ LOUDNESS SWITCH
Push this switch to the 'ON' position for low-
volume sound listening. The bass and treble are em-
phasized and you can sit back and listen to a
dynamic sound even under low-volume conditions.
© ADAPTOR/TAPE 2 SWITCH
This is used when operating an adaptor (such as a
tape creating amplifier) or when playing back a tape
in a tape deck connected to the rear panel ADAP-
TOR/TAPE 2 terminals.
@ ADAPTOR/TAPE 2 INDICATOR
This lights when the ADAPTOR/TAPE 2 switch is
set to ON.
@ OUTPUT POWER INDICATORS
The left and right indicators show the output level (in
watts) when a speaker system with an 8-ohm
nomimal impedance has been connected to the unit.
"L" indicates the left channel output level and ''R"
the right channel.
@ FUNCTION INDICATORS
The indicator corresponding to the function switch
which has been pushed lights. Each indicator has a
symbol: "@ " for PHONO, " ## " for TUNER,
" =>" for CD/AUX and " ac " for TAPE 1.
@ FUNCTION SWITCHES
PHONO: Used when playing records on a turntable
OQ connected to the rear panel PHONO ter-
minals.
TUNER: Used when listening to broadcasts on the
nm tuner connected to the rear panel TUNER
terminals.
CD/AUX: Used when operating a TV tuner or com-
— _ pact disc player etc. connected to the rear
panel CD/AUX terminals.
TAPE 1: Used when playing back tapes in the tape
Qo deck connected to the rear panel TAPE 1
terminals.
@ SPEAKER SELECTOR SWITCHES
Select the switch that corresponds to the speaker
systems through which the sound is to be heard.
When the switch is pressed, the sound is heard
through the speaker systems selected.
A: The sound is heard from the speakers con-
nected to the speaker A terminals on the rear
panel.
B: The sound is heard from the speakers con-
nected to the speaker B terminals on the rear
panel.
No sound will be heard when SPEAKERS A and B
switches are both released. This is the position at
which the sound can be heard through the head-
phones.
NOTE:
No sound will be heard through the speakers when both
the A and B switches are depressed if only one set of
speakers has been connected to either the A or B
SPEAKERS terminals.
@ PHONES JACK
Plug the headphones into this jack securely for
private listening.
NOTE:
Make it a rule to turn down the volume before plugging in
the headphones. A loud sound can hurt your ears.
@ BASS CONTROL
This is used to adjust the bass sound.
When rotated clockwise from the center DEFEAT
position, the bass is emphasized; when rotated
counterclockwise, the bass is attenuated.
@ TREBLE CONTROL
This is used to adjust the treble sound.
When rotated clockwise from the center DEFEAT
position, the treble is emphasized; when rotated
counterclockwise, the treble is attenuated.
@ BALANCE CONTROL
This is normally kept at the '0' position. It should be
adjusted when the left/right stereo balance has
become lopsided. Rotate the control to the left when
the right channel sound is too loud; rotate it to the
right when the left channel sound is too loud.
@ CD/AUX 1, 2 SELECTOR SWITCH
Use this to select the component which has been
connected to the auxiliary (CD/AUX 1, 2) terminals
on the rear panel.
@ VOLUME CONTROL
This is used to adjust the sound volume of the
speakers and headphone. No sound will be heard
when the control has been set to the "0" position.
Rotate the control clockwise to increase the sound
level.
OUTPUT POWER INDICATORS
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The output power indicators show the output
level when speaker systems with a nominal im-
pedance of 8 ohms have been connected to the
rear panel speaker terminals. The output level
(peak value) is indicated in watts by the scale
units. Since a logarithmic compression scale is
used, outputs ranging from the weak (0.05 W) to
the strong (70 W) can be displayed without selec-
ting the range.
During actual play the impedance of the speaker
systems changes in accordance with the frequen-
cy. For this reason, the value indicated is not an
exact representation of the output but only a
rough guide.