SU-VX620
m
CONTENTS
Page
Page
@BEFORE
REPAIR
AND
ADJUSTMENT...................06.
2
e@PRINTED
CIRCUIT
BOARD
DIAGRAM................
18~22
@PROTECTION
CIRCUITRY
.......
0.000
2
e@WIRING
CONNECTION
DIAGRAM
.................0.005
23
@ACCESSORIES
213.
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PRES
2
e@FUNCTIONS
OF
IC
TERMINALS
.................0.0000.
24
@FUNCTION
OF
CONTROLS
.......
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3
@BLOCK
DIAGRAM.........
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cece
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25
@CONNECTIONS
oo...
teen
eeenes
4~6
@REPLACEMENT
PARTSLIST
.................004
26~29,
32
e@DISASSEMBLY
INSTRUCTIONS
...........
000.
e
aes
7~11
@CABINET
PARTS
LOCATION
..................0..020008
30,
31
eMEASUREMENTS
AND
ADJUSTMENTS
................
14
@PACKAGING
.....
2.2
ccc
ete
eet
ence
nee
eens
33
@SCHEMATIC
DIAGRAM
.............
000.
12~17
m@
BEFORE
REPAIR
AND
ADJUSTMENT
(1)
Turn
off
the
power
supply.
Using
a
10Q,
10
W
resistor,
shortcircuit
both
ends
of
power
supply
capacitors
C701
and
C702
in
order
to
discharge
the
voltage.
(2)
Before
turning
on
the
power
switch
of
the
unit.
.
Connect
the
voltage
controller
to
the
primary
side.
.
Connect
the
AC
ampere
meter
to
the
primary
side
or
connect
the
DC
voltage
meter
to
the
“+B”
circuit
of
the
secondary
side.
.
Turn
the
VR
of
ICQ
(VR451
and
VR452)
to
minimum
(counterclockwise).
.
After
setting
the
output
to
zero
of
the
voltage
controller,
turn
on
the
power
switch
of
the
unit.
And
increase
the
output
of
voltage
controller
gradually.
Then,
check
carefully
whether
the
current
value
of
primary
side
become
more
than
following
value
or
whether
the
DC
voltage
of
secondary
side
is
increasing
slowly.
E.
If
the
value
of
current
is
increasing
unusually
or
the
DC
voltage
is
not
increasing,
lower
the
output
level
of
voltage
controller
immediately.
@The
current
value
of
the
primary
side
at
no
signal.
(Confirm
the
power
supply
voltage
of
each
area
and
provided
voltage
of
the
unit.)
C0OWPY
Power
supply
voltage
AC
230
V
AC
240
V
m@
PROTECTION
CIRCUITRY
The
protection
circuitry
of
the
amplifier
may
have
operated
if
either
of
the
following
conditions
is
noticed:
®@No
sound
is
heard
when
the
power
is
turned
on.
Sound
stops
during
a
performance.
The
function
of
this
circuitry
is
to
prevent
circuitry
damage
if,
for
example,
the
positive
and
negative
speaker
connection
wires
are
Note:
“shorted”,
or
ifspeaker
systems
with
an
impedance
less
than
the
When
the
protection
circuitry
functions,
the
unit
will
not
operate
indicated
rated
impedance
of
the
amplifier
are
used.
unless
the
power
is
first
turned
off
and
then
on
again.
m
ACCESSORIES
@AC
powersupply
cord
......
6.
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il
<RJAO0019-1K>:
(EG),
(EO)
<SJA193>:
(EB)
If
this
occurs,
follow
the
procedure
outlined
below:
1.
Turn
off
the
power.
2.
Determine
the
cause
of
the
problem
and
correct
it.
3.
Turn
on
the
power
once
again.
Remote
control
transmitter
(RAK-SU301W)
..............
1
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eed
2
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L
The
configuration
of
the
AC
power
supply
cord
differs
according
to
area.
@
FUNCTION
OF
CONTROLS
STEREO
INTEGRATED
AMPLIFIER
a
SU-VX620
[1]
Power
switch
(POWER)
[2]
Operation
indicators
(AMPLIFIER
OPERATION
MONITOR)
These
indicators
illuminate
to
indicate
the
operating
condi-
tion
of
this
unit.
VOLTAGE
CONTROL:
When
the
power
is
switched
ON,
this
indicator
illuminates
when
the
unit
is
in
the
operating
condition.
CURRENT
DRIVE:
When
the
power
is
switched
ON,
this
indicator
illuminates
after
about
4
seconds
when
the
unit
is
in
the
operating
condi-
tion.
If
an
abnormal
condition
in
the
circuitry
is
detected,
such
as
DC
voltage
appearing
in
the
output,
or
a
short-circuit
of
the
positive
(+)
and
negative
(—)
wires
from
the
speaker
ter-
minals,
the
protection
circuit
functions
and
this
indicator
will
not
illuminate.
[3]
Source
direct
switch
(SOURCE
DIRECT)
This
switch
is
used
when
enjoying
high
quality
sound
playback
such
as
that
from
a
CD.
[4]
Volume
control
(VOLUME)
[5]
Recording
selector
(REC
SELECTOR)
This
selector
is
used
to
select
the
sound
source
to
be
record-
ed
by
the
connected
first
tape
deck
and/or
second
tape
deck
(or
DAT).
[6]
Remote
control
input
indicator
(REMOTE
SELECTOR)
This
indicator
illuminates
to
indicate
the
input
source
selected
(TAPE
1,
CD
or
TUNER).
While
this
indicator
is
illuminated,
the
input
will
not
change
even
if
the
input
source
is
changed
using
the
main
unit
input
selector.
Remote
control
input
erase
button
(OFF)
This
button
is
used
to
erase
the
input
selected
on
the
remote
control
transmitter
in
order
to
select
the
desired
source
us-
ing
the
input
selector
on
the
main
unit.
Input
selector
(INPUT
SELECTOR)
This
selector
is
used
to
select
the
sound
source
to
be
heard,
such
as
a
disc,
radio
broadcast,
etc.
[9]
Headphones
jack
(PHONES)
Speaker
selector
(SPEAKERS)
This
selector
is
used
to
select
the
speakers
to
be
used.
[11]
Tone
controls
(BASS/TREBLE)
The
bass
control
is
used
to
adjust
the
low-frequency
sound
range,
and
the
treble
control
is
used
to
adjust
the
high-
frequency
sound
range.
[12]
Balance
control
(BALANCE)
This
control
is
used
to
adjust
the
left/right
volume
balance.
[13]
Loudness
switch
(LOUDNESS)
This
switch
is
used
when
listening
to
music
at
a
low
volume
level.
Auditory
perception
of
sound
in
the
low
frequency
range
falls
off
at
low
volume,
but
when
the
switch
is
set
to
the
“ON”
position,
this
deficiency
is
compensated
for,
so
that
the
full
impact
of
the
musical
performance
can
be
en-
joyed.
Subsonic
filter
switch
(SUBSONIC
FILTER)
This
switch
is
used
to
eliminate
ultra-low-frequency
noise
such
as
motor
‘‘rumble”’
and
unusual
vibration
of
the
woofer
cone
caused
by
a
warped
disc,
etc.
[15]
Mode
selector
(MODE)
This
selector
is
used
to
select
stereo
or
monaural
operation.
Remote
control
signal
receptor
(REMOTE
SENSOR)
Receives
the
signals
from
the
remote
control.
