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rJION€EfI
RECORD PLAYING
1. Set
the FUNCTION switch to PHONO.
2. Set
the MODE switch to match the type of
disc record
to
be
played.
*
Note
that
it
is
necessary
to
adiust the Carrier level and Separation
for
each
four-channel before playing
a
CD-4 disc record.
For details,
see
below and
the next
page.
**
Any
ordinary
2-channel
stereo record
other than
CD-4 disc
records
can be played
at
either position
of
RM
or
SQ
as
4-channel
perfor-
mance.
3.
Set the VOLUME,
BASS and TREBLE controls to
desired
positions.
USING
TH
E
AUX
JACK
1. Set
the FUNCTION switch to AUX.
2.
Set
the
MODE switch according
to
the type
of
the
program sources connect
to
the AUX jacks.
3.
Set the VOLUME,
BASS and TREBLE controls to
desired positions.
BEFORE
CD.4
RECORD
PLAYING
Before playing aCD-4 disc record, adjust such
as
"Carrier
Level," "Separation," "Channel Confirmation
and Sound
Volume Adjustment"
with
the supplied test record.
Re-adjustment is required when the phono cartridge
and
stylus are replaced,
or
after a long period
of
play. For
details,
follow
the
steps
described
below:
CARRIER LEVEL ADruSTMENT
1.
Turn
up
volume to
average
listening
level.
2.
Play the Band
4
to
adjust a 30kHz carrier level from
the test
record. "SIGNAL
FOR 30kHz
CARRIER
LEVEL ADJUSTMENT."
3.
Listening
to
the
signal (400H2),
turn the
CARRIER
LEVEL
CONTROL knob
of
the QX-646 on the
rear
panel
from the right
(maximum position)
to
the left.
4.
Turning
the
CARRIER LEVEL CONTROL knob to
the
left, find
the
changing
point
of
tone quality,
at
which the
signal becomes distorted. Then
turn
to
the
right
to let
the knob adjust at
a
tuming
angle
of
be-
tween 15"-30".
Once
the final carrier adjustment
is
made,
the knob must
not
be turned except
for
readjustment after replacement
of
phono cartridge
or
stylus, and after
a
long period of
play.
CD-4
INDICATOR
LAMP
I\4ODE
INDICATOR
LAMPS
2
CHANNEL
4
cHANNEL
@
cD-4
FlM
so
Fig.
15
NOTE:
If
you
use
a
2-channel
phono
cartridge
of a
capacity
larger than
specified,
you
may
occasionally
feel
repro-
duced sound distorted.
In
this
case,
turn
the
SEPARA-
TION
CONTROL
knob
to
left
(b-) of
the
QX-646
on
the
front
panel,
to eliminate
the
distorted
sound.
ASC
(Automatic Selectivity Control) Circuit
When the
engraved grooves
of
a CD-4
disc
record
a.re
worn down into
a
noise
un-
pleasant
to
listen, the ASC circuit is
used
for'suppressing such
a
noise
by
compensat-
ing
for
frequency
in
accordance
with
a
change
of
carrier
levels.
Type
of
Record.
MODE
Switch
Position
RM 4-channel record
4CH
RM
SO
matrix
4-channel record
4CH
SO
CD-4
record*
4CH
CD-4
Ordinary
stereo
record
*
"
2CH
3
TEST RECORD
(POX.I011I
Fig.
16
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