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  9. Panasonic SU-373 User manual

Panasonic SU-373 User manual

Service
Man
Stereo
Integrated
Amplifier
ORDER
NO.
HAD87051
20C1
Amplifier
SU-373
Color
(K)...Black
Type
SPECIFICATIONS
(IHF’
78)
M@
AMPLIFIER
SECTION
Rated
minimum
sine
wave
RMS
power
output
20
Hz~20
kHz
both
channels
driven
0.09%
total
harmonic
distortion
100W
per
channel
(8
ohms)
1
kHz
continuous
power
output
both
channels
driven
0.09%
total
harmonic
distortion
105W
per
channel
(8
ohms)
Dynamic
headroom
1.1
dB
(8
ohms)
Total
harmonic
distortion
half
power
at
1
kHz
0.09%
(8
ohms)
SMPTE
intermodulation
distortion
0.09%
(8
ohms)
Note:
Frequency
response
PHONO
RIAA
standard
curve
+0.8
dB
TUNER,
CD/AUX,
TAPE
1,
TAPE
2/EQ
10:
A270
KHZ;
—3:dB
Total
harmonic
distortion
is
measured
by
the
digital
spectrum
analyzer
(H.P.
3045
system).
Specifications
are
subject
to
change
without
notice
for
further
improvement.
Mi
CONTENTS
SAFETY
PRECAUTION
..........-.
PROTECTION
CIRCUITRY
.........-
BEFORE
REPAIR......-++
+2
sees
HOW
TO
CONNECTION.......-...-:
LOCATION
OF
CONTROLS........
DISASSEMBLY
INSTRUCTIONS
......
BLOCK
DIAGRAM
......++++++:5
Panasonic.
Matsushita
Services
Company
50
Meadowland
Parkway,
Secaucus,
New
Jersey
07094
Panasonic
Hawaii,
Inc.
91-238,
Kauhi
St.
Ewa
Beach
P.O.
Box
774
Honolulu,
Hawaii
96808-0774
Tone
controls
BASS
TREBLE
Loudness
control
(volume
at
~
30
dB)
50
Hz.
+10
dB~
-10
dB
20-KH2,.
4
10:
dB==—10'
dB
Input
sensitivity
50
Hz,
+9
dB
PHONO
0.4
mV
(2.5
mV,
IHF
'66)
Output
voltage
TUNER,
CD/AUX,
TAPE
1,
TAPE
2/EQ
TAPE
1,
TAPE
2/EQ
REC
OUT
150
mV
15
mV
(150
mV,
IHF
'66)
Low
frequency
damping
factor
50
(8
ohms)
S/N
(IHF,
A)
Load
impedance
PHONO
71
dB
(73
dB,
IHF
'66)
MAIN
or
REMOTE
8~16
ohms
TUNER,
CD/AUX,
TAPE
1,
TAPE
2/EQ
MAIN
and
REMOTE
8~16
ohms
75
dB
(94
dB,
IHF
'66)
@
GENERAL
Maximum
input
voltage
;
PHONO
128
mV
(135
mV,
1
kHz)
Power
consumption
360W,
470
VA
Input
impedance
power
supply
|
AC
120V,
60
Hz
PHONO
A?
ionic
Dimensions
(WxHxD)
430
x
oe
x
240
mm
TUNER,
CD/AUX,
TAPE
1,
TAPE
2/EQ
TO:
eee
a
opciones
Weight
7.0
kg
(15.4
Ib.)
Page
Page
roe
tee
2
CIRCUIT
BOARD
AND
WIRING
soe
eee
2
CONNECTION
DIAGRAM....
9~
12
ee
Sa
ee
S
2
SCHEMATIC
DIAGRAM
.................
13
™~
16
soe
ee
3
RESISTOR
&
CAPACITORS
...............
17
ses
4
REPLACEMENT
PARTS
LIST..............
18
Dee
5,6
EXPLODED
VIEWS...............+.....
19,
20
eee,
Ghana
rs
7,8
Panasonic
Sales
Company,
Division
of
Matsushita
Electric
of
Puerto
Rico,
Inc.
Ave.
65
De
Infanteria,
KM
9.7
Victoria
Industrial
Park
Carolina,
Puerto
Rico
00630
Mi
SAFETY
PRECAUTION
mh
wWhHND
prevent
the
customer
from
being
exposed
to
a
shock
hazard.
e
INSULATION
RESISTANCE
TEST
(This
‘safety
precaution”
is
applied
in
U.S.A.)
.
Before
servicing,
unplug
the
power
cord
to
prevent
an
electric
shock.
.
When
replacing
parts,
use
only
manufacturer’s
recommended
components
for
safety.
.
Check
the
condition
of
the
power
cord.
Replace
if
wear
or
damage
Is
evident.
.
After
servicing,
be
sure
to
restore
the
lead
dress,
insulation
barriers,
insulation
papers,
shields,
etc.
.
Before
returning
the
serviced
equipment
to
the
customer,
be
sure
to
make
the
following
insulation resistance
test
to
1.
Unplug
the
power
cord
and
short
the
two
prongs
of
the
plug
with
a
jumper
wire.
2.
Turn
on
the
power
switch.
3.
Measure
the
resistance
value
with
ohmmeter
between
the
jumpered
AC
plug
and
each
exposed
metal
cabinet
part,
such
as
screwheads
antenna,
control
shafts,
handle
brackets,
etc.
Equipment
with
antenna
terminals
should
read
between
3MQ
and
5.2M2Q
to
all
exposed
parts.
all
exposed
parts.
(Fig.
B)
Note:
Antenna
terminal
Exposed
2
Exposed
metal
Ch
metal
part
part
|
Ohmmeter
(Fig.
A)
Resistance
=
3M2—5.2MQ
(Fig.
A)
Equipment
without
antenna
terminals
should
read
approximately
infinity
to
Some
exposed
parts
may
be
isolated
from
the
chassis
by
design.
These
will
read
infinity.
(Fig.
B)
Resistance
=
Approx
oo
4.
|f
the
measurement
is
outside
the
specified
limits,
there
is
a
possibility
of
a
shock
hazard.
The
equipment
should
be
repaired
and
rechecked
before
It
is
returned
to
the
customer.
Mi
PROTECTION
CIRCUITRY
The
protection
circuitry
may
have
operated
if
either
of
the
following
conditions
is
noticed:
@
No
sound
is
neard
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
‘‘shorted’’,
or
if
speaker
systems
with
an
impedance
less
than
the
indicated
rated
impedance
of
this
unit
are
used.
Mi
BEFORE
REPAIR
If
this
occurs,
follow
the
procedure
outlines
below:
1.
Turn
off
the
power.
2.
Determine
the
cause
of
the
problem
and
correct
It.
3.
Turn
on
the
power
once
again
after
one
minute.
Note
When
the
protection
circuitry
functions,
the
unit
will
not
operate
unless
the
power
is
first
turned
off
and
then
on
again.
Disconnect
AC
power,
Discharge
both
Power
Supply
Capacitors
C703
and
C704
through
a
102,
5W
resistor
to
ground.
DO
NOT
SHORT-CIRCUIT
DIRECTLY
(witha
screwdriver
blade,
for
instance),
as
this
may
distroy
solid
state
devices.
After
repairs
are
completed,
restore
power
gradually
using
a
variac,
to
avoid
overcurrent.
Current
consumption
at
120V,
60Hz
in
NO
SIGNAL
mode
should
be
250
~
500mA.
e
Accessories
@AC
power
supplycord
............
1
e
Flat
cable
for
remote-control
(SJA172—1)
operation
....
1
(SWKUV96KM)
eBatteries..........
2
(UM—3NEP)
@
Remote-control
@
HOW
TO
CONNECT
Note:
Be
sure
to
use
the
power
cord
included
with
each
unit,
because
some
power
cords
are
polarized
and
some
are
non-
polarized
(plug
shapes
are
different).
foretaTar-xeaccelame)
mer:
le)
(-1-3
Connection
of
AC
power
supply
cords
This
turntable’s
ground
wire
connection
is
not
required
for
this
system.
(Ground
wire
is
not
included.)
Turntable
|
Turntable
(SL-H309U
)
(L)
Household
AC
outlet
AC
po
F
(AC
120V/60
Hz)
wer
Supply
cor
(Included
in
turntable)
-{@)
Tuner
QUTPUT
AC
power
supply
(ST-373)
|
REMOTE
cord
B)
g
CONTROL
(Included
in
tuner)
O
aa
[see]
ria
Tuner
eer
rae
connection
cable
{(pL
A\
To
prevent
overheating
of
the
stereo
amplifier,
only
the
tuner
should
be
placed
on
top
of
it.
AC
power
»
Stereo
connection
supply
cord
AS
cable
(Short)
(Included
ry
in
amplifier)
(R)(L)(R)(L)
Fiat
cable
for
remote-control
Amplifier
. .
ipl
e78!
|
rTAPE)
——
-TAPE2/EQy
[=|
H
7
REC
PLAY
REC
PLAY
PRE
MAIN
|
Amplifier
CD/AUX
OUT
BACK
cp,
OUT
BACK
OUT
IN
:
TAPE1
maria
©
©
C2
le
TAPE1
we
©
©|6O@
GND
PHONO
TUNER
:
(TUNER)
aa
(R)(L)
(R)(L)(R)(
This
terminal
can
be
:
:
used
if,
in
the
future,
a
turntable
with
a
ground
wire
is
connected
to
this
amplifier.
L)
{
(R)(L)
(R)
(L)
=
___
Stereo
connection
cable
(Short)
Graphic
Perutagee
Graphic
equalizer
coke
equalizer
(SH-253)
o
oa
|
Flat
cable
for
AC
power
supply
cord
Stereo
connection
cables
remote-control
(option)
(Short)
Tape
deck
m
Tape
deck
(RS-373)
|
LINE
IN.
LINE
OUT
REMOTE
Zz
=
Connection
cable
for
Pe
3
,
Stereo
connection
=
=
remote-control
|
ee
supply
cor
cable
(option)
R)
(
i
:
(option:
SJP2257T)
(Included
in
cassette
tape
deck)
Compact
Connect
this
cord
to
the
AC
outlet
of
disc
player
the
amplifier
if
the
compact
disc
is
not
(option)
connected
Compact
disc
player
(option)
Mi
LOCATION
OF
CONTROLS
Power
switch
(power)
(volume/balance)
Volume-controls
(volume)
Loudness
switch
(loudness)
Headphones
Tape-monitor
selector/indicator
Balance
controls
jack
(phones)
(tape
2/EQ)
(balance)
Speaker
selectors
(speakers)
Input
selectors/indicators
(input
selector)
Tone
controls
(bass/treble)
CD/tapel
output
Tuner
connector
Playback
TAPE
IL
Playback
a
ah
L-TAPE2
/
EXT
Rec
out
Switched}——-AC
outlets
Main
speaker
terminal
AC
inlet
(+)(—)(—
ine
Lt
«tech
Remote
speaker
terminal!
Rech
Main
in
Ground
Phono
TUNER
CD/
aux
Pre
out
Tape
deck
connector
®
Phono
input
capacitance
is
about
100pF.
fi.
DISASSEM
BLY
INSTRUCTIONS
|
use
No.
How
to
remove
the
main
P.C.B.
How
to
remove
the
front
panel
ATTEN
TOME
Ce.
.
|
Procedure
SOME
CHASSIS
COMPONTS
MAY
HAVE
SHARP
i
(paramos
ane
tO
Meus
(‘O
~
ri0)
.
ene
|
EDGES.
BE
CAREFUL
WHEN
DISASSEMBLING
DO
Pamaveshe
mane
CB
a
1.
Remove
the
top
cabinet.
AND
SERVICING.
.U.D.
2.
Pull
out
the
2
knobs
(@,@).
3.
Remove
the
3
screws
(@
~@
).
4.
Remove
the
2
nuts
(@,
@)
5.
Remove
the
connector.
Removing
the
knob
Connector
(lOpin)
Wind
cellophane
tape
around
the
knob
and
put
it
the
direction
of
the
arrow
as
shown
in
Fig.
1.
Front
panel
Fig.
1
Fig.
2
|
eee
How
to
remove
the
power
amplifier
IC.
How
to
remove
the
P.C.B.
Procedure
Procedure
3
4
1.
Unsolder
the
power
IC.
1.2
1.
Remove
the
7
screws
(Q@
~
@).
.
a
2.
Remove
the
2
screws
(@,
@).
2.
Remove
the
LED
P.C.B.
:
3.
Remove
the
sub
heat-sink.
4.
Remove
the
2
screws
(@,
@).
LED
PCB
@
When
mounting
the
power
IC,
apply
silicon
thermal
compound
(SZZOL15
or
equivalent)
to
the
rear
of
the
power
'C.,
3.
Remove
the
power
switch
knob.
4.
Remove
the
1
screw
(
@).
Fig.
3
5
Remove
the
power
switch
P.C.B.
a?
6.
Remove
the
1
tab.
Procedure
7.
Remove
the
headphones
P.C.B.
5
Knob
Headphones
PC.B
Power
switch
PC.B
Remove
the
knob
by
pushing
it
Fig.
4
from
behind
the
panel
as
shown
in
Fig.
4.
Hi
BLOCK
DIAGRAM
MAIN
IN
ol.
PRE
OUT
LIC
101
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(+8
EQUALIZER
AMP
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ATTENUATOR
TONE
AMP
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IC's
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10
11
12
13 14
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16
17
18
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Left’’
switch.
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5,
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Loudeness
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switch.
Q257,258
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selector,
‘‘Tape
1'’
switch.
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8.S8
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Input
selector,
‘’‘CD/aux’’
switch.
Q258
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Input
selector,
‘“Tuner”’
switch.
yo"
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selector,
‘‘Phono’’
switch.
cat
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11.$13
:
Main
speakers
switch
in
‘‘on”’
position.
has
ON
ad
12.514
:
Remote
speakers
switch
in
‘‘off’’
position.
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switch
in
‘’on”’
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Q255
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2
3
14.
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voltage
values
are
the
standard
values
for
12Vv
q>
O.4V
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I
8
|
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7
)
bensos
the
unit
measured
by
the
DC
electronic
circuit
tester
©
RELAY
DRIVE}
(high-impedance)
with
the
chassis
taken
as
standard.
is
x
Therefore,
there
may
exist
some
errors
in
the
voltage
|
i
g
2
values,
depending
on
the
internal
impedance
of
the
Gs
ere
DC
circuit
tester.
Measurement
condition:
Input
selector
—
phono
(no
signal)
Volume
—
Minimum
Loudness
—
off
15;
mm
}eme
Positive
(+B)
voltage
lines
16,
-«o{__}ee
Negative
(—B)
voltage
lines
17,
seexeeexenst
Signal
lines
(L
channel)
18.
Impedance
safety
notice:
|
I
Components
identified
by
A,
mark
have
special,
Lene
ES
RE
f
characteristics
important
for
safety.
When
replacing
any
of
these
components,
use
only
manufacturer’s
specified
parts.
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111
MUTING
CONTROL
C405
0.01
—
C406
0.01
t—
R602
470K
(LOUDNESS)
*
Coution!
IC
and
LSI
are
sensitive
to
static
electricity.
Secondary
trouble
can
be
prevented
by
taking
=
care
during
repair.
‘S)
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*
Cover
the
parts
boxes
made
of
plastics
with
|
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foil.
oo
*
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the
soldering
iron.
2
Te
METER
AMP.
CIRCUIT
1C602
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LED
DRIVE
<<
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SPEAKERS
R556
150K
Om
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one
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work
table.
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not
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tne
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IC
or
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|1C203
microcomputer
is
to
be
modified
or
S
.
|
7
3
halfway
under
production.
5.7V
.
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:
[RefNo
|
Old
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0601,603,
607,
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60,603,605
607,603
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new-type
microcomputer
is
interchangeable
.
a
2
with
the
old
one,
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the
new
ones
are
shipped
as
replacement
part
for
the
products
already
supplied,
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BOF.
sain
ak
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4
REGULATOR
@
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the
circuit
diagram
and
replacement
parts
list
is
described
the
new-type
microcomputer.
—15-
=
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Notes:
i
REPLACEMENT
PARTS
LIST
1.
Part
numbers
are
indicated
on
most
mechanical
parts.
Piease
use
this
part
number
for
parts
order.
2.
Important
safety
notice:
Components
identified
by
A
mark
have
special
characteristics
important
for
safety.
When
replacing
any
of
these
components,
use
only
manufacturer's
specified
parts.
3.
Bracketed
indications
in
Ref.
No.
columns
specify
the
area.
Parts
without
these
indications
can
be
used
for
all
areas.
Notes:
*
!mportant
safety
notice:
Components
identified
by
A
mark
have
special
charac-
teristics
important
for
safety.
When
replacing
any
of
-
Carbon
pe
;
:
.Th
f
tand
for
th
tit
;
these
components
use
only
manufacturer's
specified
Sa
Ode
4.
The
parenthesized
numbers
in
the
column
of
description
stand
tor
the
quantity
per
set
parts.
:
Metal
Film
.
*
indicati
i
_
No.
i
;
Fuse
Type
Metal
‘oti
:
:
Metal
Film
(chip)
(SAPS
PR
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No
RE
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Parts
without
these
indications
can
be
used
for
all
areas.
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Value
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191
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001
030
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L204
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001
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Example
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:
:
+0.5pF
|
QCUD
:
Ceramic
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Type)
:
:
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102
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:
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PL
701
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LAMP
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125V,
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electrolyte
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0256
MATES
001
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double
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capcitor
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1
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003
439
2072
1
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001
033
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4
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ASS’Y
001
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Value
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micro
farad)
S3,
S4
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0258-,
D264
LNOTE328P
001
032
86746
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ASS’Y
$5,
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001
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001
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001
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001
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C510
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001
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0360
4
SPP723
O16
978
02075
PROTECTION
COVER
ae
ee
ee
|
cee
li
EXPLODED
VIEW
Headphones
P.C.B.
870503800
®YY/TS
Printed
in
Japan
<5
O02
=
G:2:

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