Sanyo JA 20 User manual

SERVICE
MANUAL
@SANYO
STEREO
AMPLIFIER
JA
20
(EUROPE)
ШИНЕ
ë
a
NOTE:
SPECIFICATIONS
The
below
mentioned
specifications
are
mainly
based
on
the
IHF
measurements
standard.
They
can
therefore
not
directly
be
compared
with
specifications
based
on
the
DIN
standard
or
other
standards.
Continuous
output
power
...........
20
W
x
2
(at
8
ohms,
1%
distortion)
Total
harmonic
distortion
...........
0.1%
(16
W
output,
8
ohms)
Input
sensitivity
and
impedance
PHONG
1.1.1...
Le
2.5
mV/47
kohms
AUX/TUNER/TAPEPLAY
........
150
mV/47
kohms
Phono
overload
level
...............
120
mV
RMS
(at
1
kHz)
Output
level
pai
jan
b.
.........
150
mV
Frequency
тео
S
GG.
10
Hz
—
40
kHz
(AUX)
Tone
control
response
BASS
С
2
ee
+8
dB
(at
100
Hz)
TREBEE2
eee
、。。。、.
+8
dB
(at
10
kHz)
High
filter
respone
an
KAN...
8
kHz
(—6
dB/oct.)
Loudness
control
response
(Vol.
—30
dB)
100
Hz/10
ketenes.
....
*8
dB/+4
dB
Signal
to
noise
таве
ЕЕ...
70
dB
Power
requirements
...............
AC:
220
V,
50
Hz
Power
consumption
TM...
90
W
AC
output
socket
.
.
ШШ
5...
AC:
18
V,
300
mA
(max.)
Dimensions
(Approx)
TET
E...
380
(W)
x
180
(D)
x
88
(H)
mm
шы
жч,
ж
ee
Ta
ЧА
(15-3/16"
x
7-1/8"
x
3-1/2")
Weight
(Approx)
ass
=
ere
sc.
3.6
kg
(7
Ibs.
15
ozs.)
*
Specifications
subject
to
change
without
notice.
WM-6567

FRONT PANEL DISASSEMBLY
FITTING
OF
LED
METER
PCB
ASS'Y
ADJUSTMENT
1. ADJUSTMENT OF BIAS
* CONDITIONS
2.
ADJUSTMENT
OF
PEAK
LEVEL
METER
*
CONDITIONS
VOLUME
CONTROL:
“0”
(Minimum)
BALANCE
CONTROL
VOLUME:
(Center)
BASS
CONTROL
VOLUME:
“0”
(Center)
TREBLE
CONTROL
VOLUME:
“0”
(Center)
FUNCTION
SWITCH:
TUNER
MONITOR SWITCH: SOURCE
HIGH FILTER SWITCH: OFF
LOUDNESS SWITCH: OFF
OUTPUT LOAD: NO LOAD
After
the
power
switch
is
turned
on,
adjust
SVR703
and
SVR803
respectively
as follows:
L — channel: SVR703 for 2 ~ 3mV reading between the
both leads of R734.
R
—
channel:
SV
R803
for
2
~
3mV
reading
between
the
both leads of R834.
TEST OSCILLATOR
(OSCILLATOR & ATTENUATOR)
INPUT
SIGNAL:
1kHz,
46mV
OUTPUT
LOAD:
8Q,
100W,
non-inductive
resistance
VOLUME
CONTROL:
"10"
(Maximum)
(1)
Introduce
test
oscillator
signal
to
the
TUNER
terminal.
(2)
Adjust
test
oscillator
signal
so
that
LED
“3”
of
the
right
side
peak
level
meter
begins
to
light.
(The
output
voltage
of
the
right
side
becomes
about
3.5V
at
this
time.)
Next,
check
that
the
output
voltage
of
left
speaker
is
same
as
the
right
side.
Adjust
with
SVR762
so
that
LED
“3”
of
peak
level
meter
begins
to
light.
(3
—
OSCILLOSCOPE
OUTPUT (SP)

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VOLT
METER
(DC)
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R734
R834
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SVR803

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SW
51.
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ЭЗ...
S4....
SS...
ITCHES
...FUNCTION SWITCH
.MONITOR SWITCH
.HIGH
FILTER
SWITCH
LOUDNESS SWITCH
.POWER SWITCH
MAIN
(
TUNER
PHONO
AUX
)
(SOURCE
TAPE
)
(
ON
(
ON
(
ON
TO TUNER
AC OUT~ 18V 300mA
CONTROLS
BALANCE CONTROL
VR702.
802
...
VOLUME
CONTROL
VR704. 804 ...BASS CONTROL
VR705,
805
...TREBLE
CONTROL

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PHONO
TUNER
AUK
— LEFT
——RIGHT
PHONES
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0727,
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25А965
(€)
0765
0723,
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0761
0724,
825....25А999
0725, 825... 25С536

SPEAKERS
TO TUNER
RIGHT
LEFT
AC
OUT
~
18У
300mA
— . 一
PHONES
s
со
ш
ә
d
BLUE
T901
50Hz
SWITCHES
Sie
FUNCTION
SWITCH
Ponce
tert
MONITOR
SWITCH
Som ee HIGH FILTER SWITCH
S4............,
LOUDNESS
SWITCH
55............
POWER
SWITCH
CONTROLS
VR701...........BALANCE CONTROL
VR702, 80 CONTROL
VR704,
804...
CONTROL
VR705, 805....... CONTROL