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Thank
you
for
the
confidence shown
us
in
purchasing
a
Pioneer 4-channel receiver, model
QX-646. This
4-channel
solid state
receiver
will
lead
you into the
exciting
world
of
4-channel
sound
in
all
its
varieties: discrete
4-channel
tapes
or
disc
records
(CD-4), regular
matrix
(RM)
as
well
as
SQ
matrix
records
and
broadcasts.
lf
you
only
have
two
speaker systems
at the
moment,
the
QX-646
will
also
serve
LINE
VOLTAGE
AND
FUSE
The QX-646 is available
in
two
models; one model
operates
only on L20V,
and the other operates on
one
of
the five line
voltages;
110V, 1,20V,130V,
220Y
and
240V.
If
your
QX-646 is the latter model,
set
the
unit to
the proper line voltage by following the
procedure
described below.
CHANGING LINE VOLTAGE SETTING AND
FUSE
To
remove
the
fuse,
turn the
fuse cap located on
the line
voltage selector
in
the direction indicated
by the arrow.
Then remove the
fuse
plug from the
unit. Put
the
fuse plug so
that the
proper
line
voltage marking can be
seen
through the cut in the
edge
of
the plug.
Whenever
the position
of
the
selector
is
changed,
check
the rating
of
the
fuse.
A
l-ampere fuse is
to
be used
for either
220Y or
240V
operation and
a
2-ampere fuse
for
110V,
120V or 130V operation.
If
the rating
of
the
fuse
is
correct, replace
cap.
FUSE REPLACEMENT
If
the fuse blows, remove the fuse
cap and replace
the fuse with
a
new one.
6a
"b-qffiw:
as
a
2-channel receiver
until
you
decide
to
step
up
into
4-channel sound
by
adding
two
more
speaker systems.
To
develop
its
full
potentials,
the QX-646 must
be
com-
bined
with other
components
(speakers,
turntable,
tape
deck)
of
equally high
quality. Also,
please
study
the fol-
lowing
operating instructions
carefully
to
make
full
use
of
this
receiver's many possibilities and features.
CONTENTS
LineVoltageandFuse
....2
QX-646 Features and Performance . . . . .
.
3
Composition
of
a4-channelStereoSystem
.....
4
Hints
for
Operating
CD-4DiscRecords
......5
Speaker Systems
-
PlacementandConnections
.
...
6
Antennas and
Ground Connections . . . .
.
7
ConnectionofTapeDeck. ......
8
Connectionof Turntable
...
.....9
ConnectionDiagram
.......
9
FrontPanelFacilities..
...11
PreparationsbeforeOperation
...
13
FMandAMReception..
..74
RecordPlaying
.....15
UsingtheAUXJack.
.....15
BeforeCD-4RecordPlaying
...
.
.
15
UsingaTapeDeck.
......
L7
AboutCD-4Record
....
......
18
Matrix4-channelDecoder
......
19
Conditions Frequently Mistaken
forMalfunction
.
.....20
Specifications...
..2L
2
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