Sanyo JA 250 User manual

SERVICE
MANUAL
PWER
AMPLIFIER
JA 250
(EUROPE)
This
is
a
service
manual
for
mode!
JA250
and
only
items
changed
from
model
JA300
are
indicated.
For
other
items,
refer
to
Service
Manual
for
model
JA300
(WM-8507).
#
mark
represents
a
non-interchangeable
part.
(PACKING & ACCESSORY)
141-6-133T-38802
141-6-133T-46
100
Individual
Carton
=
141-6-410T-81802
141-6-410T-93100
Instruction
Manual
#
(CABINET)
,
1
141-0-122T-46500
141-0-122T-46501
Front
Panel
Assy
#
3
141-2-163T-91900 141-2-163T-91930
Rotary
Knob,
Function
#
4
141-2-163T-81730
141-2-163T-81740
Rotary
Knob,
Volume
#
6
141-2-160T-09700
141-2-160T-09701
Push
Button
#
7
141-2-160T-16500
141-2-160T-16501
Push
Button,
Power
SW
#
(CHASSIS)
13
141-2-126T-41302
141-2-126T-41307
Back
Lid
_
#
25
141-2-453T-01701
(Not
used)
Washer
3x10
x
Imm
)
(Add) 141-2-421T-43900 Special Screw
Add this sheet to Model JA300 Service Manual.
SANYO ELECTRIC TRADING CO., LTD.
33, Hoyoshi-cho 2-chome, Moriguchi-shi, Osaka-fu, 570 Japan.
Apr./'83/2000
KA
Printed
in
Japan
WM-9992

NOTE:
The below mentioned specifications are mainly based on the IHF measurements standard.
directly be compared with specifications based on the DIN standard or ther standards.
Continous output power .......
re e 8 # @ @#
Total harmonic distortion
Input sensitivity and impedance
PHONO” s63725 oars ee ea Sees
AUX/TUNER/TAPE PLAY .
Phono overload level ..........
Output level
PACE OREC oo eso ee tees
Frequency response
ss 8 8 #* © @ 8&8 @ 6
SPECIFICATIONS
25W x 2 (at 8.ohms,
0.3% distortion)
0.1% (20 W output,
8 ohms)
2.5 mV/47 kohms
. 180 mV/47 kohms
130 mV RMS (at 1kHz)
150mV
20 — 20000 Hz
Graphic equalizer controls ...
High filter response ........
Loudness control response
100 Hz/10 kHz
Power consumption
Weight (Approx.) .........
Specifications subject to change without notice.
Signal to noise ratio .......
Power requirements .......
AC output socket .........
Dimensions (Approx.) ......
They can therefore not
Shama +10 dB (63/250/1000/
4000/16000 Hz)
eee 7 kHz (—6 dB/oct.)
Satoh We +8 dB/+4 dB
ie hee 90 dB
ay hea ees AC: 220V, 50Hz
ere 130 W
5 Sb, ase AC: 18 V, 300 mA
satan 420 (W) x 220 (D) x
85 (H) mm
(16-1/2” x 8-5/8” x3-3/8"’)
BS ach es 4 kg (9 Ibs.)
WM-8507
AS

DISMOUNTING
OF
CABINET
AND
FRONT
PANEL
e@
_
Perform
disassembly
of
amplifier
after
removing
the
power
supply
cord
with
out
fail.
@
Revove
parts
in
order
of
disassembly
as
numdered.
1.
TO
DISMOUNT
CABINET
(1).
Take
out
total
4
screws
(Binding
head
tapping
4
x
8mm
1)
from
cabinet.
|
(2).
Take
out
1
screw
(Binding
head
tapping
3
x
6mm
2
)
from
cabinet.
2.
TO
DISMOUNT
FRONT
—
PANEL
(1).
Remove
volume
control
knob
and
function
select
knob.
(2).
Take
out
total
6
screws
(Binding
head
tapping
3
x
12mm
6)
from
front
panel.

ADJUSTMENT OF BIAS
. CONDITIONS
VOLUME
KNOB
:
“0°
(Minimum)
GRAPHIC
EQUALIZER
KNOB
~
:
*“Q"”
(Center)
BALANCE
KNOB
:
“0”
(Center)
FUNCTION
KNOB
:
“aux”
MONITOR
BUTTON
:
“source”
H! — FILTER BUTTON : “off”
LOUDNESS BUTTON : a © oh i ad
SPEAKER BUTTON : “on”
Note : No-input @ No-Load
@ Lol
To DC Volt Meter
—-/+
SVR701
To
DC
Volt
Meter
(L-ch)
SVR 801
(R-ch)
MAIN AMP PCB
After
the
power
switch
is
turned
on,
adjust
SVR701
and
SVR801
respectively
as
follows.
1
—
Channel
:
SVR701
for
3mV+0.5mV
reading
beteen
the
both
leads
of
R758.
R
—
Channel
:
SVR801
for
3mV+0.5mV
reading
beteen
the
both
leads
of
R858.

EXPLODED VIEW

PARTS
LIST
PARTS
LIST
Description
PACKING
&
ACCESSORY
141-6-133T-38
802
GRAPHIC
EQUALIZER
AMP
P.
C.
B.
ASS'Y
MAIN AMP P. C.B. ASS'Y
PHONO AMP C. C. B. ASS’Y
Individual
Carton
141-4-250T-61671
|
P.C.B.
Ass’y,
Phono
Amp
1
71
1
76
141-4-250T-62102
|
P.C.B.
Ass’y,
Graphic
1
77
141-4-250T-62273
|
P.C.B.
Ass’y,
Main
Amp
PCB
1
141-6-144T-8&000
|
Foam
Plastic
Case
2
|
4-240T-06900
|
Socket,
4p
RCA
1
|
Equalizer
Amp
P.C.B.
4-240T-11276
|
Socket,
9p
1
141-6-331T-11
600
|
Protector
Sheet
1
4-240T-07000
|
Socket,6p
RCA
1
Q709,809
Transistor
2SA1016
2
.
141-2-381T-04200
|
Bracket
Fuse
4
141-6-231T-3600
|
Inner
Polye
Cover
1
1C701
iC
LA6458SS
1
Q710,711,
Transistor
2SC2362
4
SVR701,801
4-222T-73573
|
Semi-Variabie
Resistor
1K
ohm
2
141-6-410T-81
802
|
Instruction
Manual
1
CAPACITORS
810,811
701,801
4-265T-07930
|
VHF
Coil
2
141-6-415T-32
300
|
Notic,
FTZ
1
C704
,804
Electrolytic
4.7u4F
25V
2
Q706
806
Transistor
2SA608K
2
4-240T-11200
|
Socket,
3p
1
C713,813
Electrolytic
14F
(Nonpolar)
50V,
2
Q701,702,
Transistor
2SC536
AUD
SP
5
Q714,814
Transistor
2SC3179
2
C710,711
Electrolytic
220uF
25V
2
703,704,
ss
Q715,815
Transistor
2SA1262
2
C707
807
Electrolytic
22uF
10V
2
705
Q712,812
Transistor
2SC2274K
2
C708
,808
Mylar
0.018uF
+5%
50V
2
Q801,802,
Transistor
2SC536
AUD
SP
5
Q713,813
Transistor
2SA984K
2
C709,809
Mylar
0.0047uF
15%
SOV
|
2
803
804,
Q716,816
Transistor
2SD612
2
-C712,812
Mytar
0.0039uF
+10%
50V
2
805
D707
807
Diode
DS442
X
2)
.
C706
,806
Mylar
0.0015uF
+10%
50V
2
Q707,708,
Transistor
2SA999
NF
4
D901
902
Diode
DS135
D
4
1
141-0-122T-46500
|
Front
Panel
Ass’y
1
C705,805
Ceramic
220pF
+10%
50V
2
807,808
903
904
2
141-0-1111T-54901
|
Cabinet
Assy
1
C702,703,
Ceramic
0.01yuF
+80—20%
3
D703,801,
Diode
DS442X
4
D906
Diode
DS135D
1
3
141-2-163T-91
900
|
Rotary
Knob
1
701
50V
802,803
4
141-2-163T-8
14
730
|
Rotary
Knob
1
C717,718
Ceramic
0.01uF
+10%
50V
2
D708
Zener
Diode
GZA15Y
1
CAPACITORS
5
141-2-164T-30700
|
Slide
Knob
6
C001,002,
Ceramic
220pF
+10%
50V
6
'
.
C903
,904
4-163T-10100
|
Electrolytic
3300uF
35V
2
6
141-2-160T-09700
|
Push
Button
4
003,004,
CAPACITORS
C907
908
Electrolytic
220uF
35V
2
7
141-2-160T-16500
|
Push
Button,
Power
SW
1
005,006
C909
Electrolytic
220uF
16V
1
C906
Electrolytic
220uF
25V
1
8
141-2-174T-119200
|
Stand
2
RESISTORS
ald
te
Electrolytic
10QuF
oo
2
C739
839
Electrolytic
1uF
(Nonpolar)
5042
;
C730,8
Electrolytic
10uF
16V
2
C902
4-2237T-13771
Capacitor
0.022uF
+20%
200V
1
All
Resistors
are
Carbon
T-type
+5%
‘AW,
unless
C732,832
Electrolytic
4.7uF
25V
2
|
|C738,838
Mylar
0.047uF
+10%
50V|
2
otherwise
noted.
C721,821
Mylar
0.15uF
+10%
50V|
2
C910,911
Mylar
0.1yF
420%
100V|
2
CHASSIS
R703,803
330
ohm
2
C723,823
Mylar
0.334F
+10%
50V|
2
|
|
C912
Ceramic
O.1uF
+10%
SOV]
1
R706,806
560
ohm
2
C725
825
Mylar
0.0082uF
+10%
50V|
2
C735,835
Ceramic
47pF
+10%
50V|
2
141-2-311T-423800
|
Chassis
1
|
|
R701,801
1.5K
ohm
2
C727
827
Mylar
0.0018uF
+10%
50V|
2
|
|C743,744,
Ceramic
220pF
§
+10%
50V|
4
141-2-125T-29600
|
Bottom
Lid
1
|
|
705,805
TSK
ohm
2
C729,829
Mylar
470pF
+10%
50V|
2
843,844
|
141-2-126T-41302
|
Back
Lid
1
|
|
R702,802
47K
ohm
2
C734
834
Mylar
470pF
+10%
50V|
2
|
{C903
Ceramic
0.1uF
+80—20%
50V|
1
141-2-310T-68400
|
Bracket,
Heat
Sink,
Right
1
|
|
R707,807
100K
ohm
2
C737
837
Mylar
0.014F
+10%
50V|
2
141-2-310T-68500
|
Bracket,
Heat
Sink,
Left
1
|
|
R704,804
270K
ohm
2
C731,831
Ceramic
220pF
+10%
50V!
2
RESISTORS
141-2-143T-92601
|
Marking
Plate
1
R700
10
ohm
i
C742,842
Ceramic
3pF
+10%
50V
2
All
Resistors
are
Carbon
T-type
15%,
%W
unless
141-2-329T-08700
|
Reflector
1
|
|
R0O1,002,
aS
On
6
C913
Mylar.470pF
+10%
50V|
1
otherwise
noted.
441-2-464T-14400
|
Fixer,
AC
Cord
1
003,004,
RESISTORS
R758,759,
Metal
0.33
ohm
P-type
1W
4
141-2-310T-69700
|
Bracket
1
005
,006
All
Resistors
are
Carbon
T-type
45%
%W,
unless
858
859
|
141-2-135T-86702
|
Cover
1
otherwise
noted.
R760
860
FP-Carbon
5.6
ohm
P-type
AW
2
141-2-464T-40500
|
Fixer
1
FUNCTION
SWITCH
P.
C.
B.
R752
852
FP-Carbon
390
ohm
P-type
2
R901
FP-Carbon
1
ohm
P-type
1
141-2-464T-29900
|
Fixer
1
R908
FP-Carbon
4.7K
ohm
P-type
1
R757,857
FP-Carbon
82
ohm
P-type
2
141-2-421T-28800
|
Special
Screw
1
141-4-250T-61771
|
P.C.B.
Ass’y,
Function
Switch
R749
849
15K
ohm
2
R762,763
FP-Carbon
33
ohm
P-type
2
141-2-464T-20600
|
Fixer
5
4-238T-56000
|
Rotary
Switch
R742,842
330K
ohm
2
R906
Metal
82
ohm
P-type
1W
1
141-2-453T-01701
|
Washer
3
x
10x
Imm
1
R725,726,
150K
ohm
5
R909
Metal
100
ohm
P-type
2W
1
727,728,
R748
848
56K
ohm
2
729
R764
864
100K
ohm
2
SWITCH
P.
C.
B.
ASS’Y
R825
,826,
150K
ohm
5
R903,904
2.2K
ohm
2
827,828
R775
875
1.5K
ohm
2
73
141-4-250T-61871
|
P.C.B.
Ass’y,
Switch
829
R774,874
3.9K
ohm
2
Pan
Hd.
Screw
2
x
4mm
$5
6,7
4-238T-56100-
|
Push
Switch
R720,721,
56K
ohm
5
R865
3.3K
ohm
1
Pan.
Hd.
Tapping
Screw
722,723,
R907
Metal
330
ohm
P-type
2W
1
W/Washer
3
x
6mm
CAPACITORS
724
R902
,905
FP-Carbon
1.5K
ohm
P-type
2
Pan.
Hd.
Tapping
Screw
C716,816
Mylar
0.056uF
+10%
50V
R820,821,
56K
ohm
5
R761,861
FP-Carbon
10
ohm
P-type
“W
2
W/Washer
3
x
8mm
C714,814
Mylar
0.0068uF
+10%
50V
822,823,
Pan.
Hd.
Tapping
Screw
C715,815
Ceramic
150pF
+10%
50V
824
W/Washer
4
x
8mm
R730,731,
15K
ohm
5
SPEAKER
SWITCH
P.C.
B.
ASS’Y
Binding
Hd.
Screw
3
x
6mm
RESISTORS
732,733,
Binding
Hd.
Screw
3
x
8mm
R710,711,
1M
ohm
734
78
141-4-250T-62373
|
P.C.B.
Ass’y,
Speaker
Switch
1
Binding
Hd.
Tapping
Screw
810,811
R830,831,
15K
ohm
5
S2
4-238T-49700
|
Switch
1
3x
6mm
R712,812
10K
ohm
832,833,
Binding
Hd.
Tapping
Screw
R709
809
3.3K
ohm
834
3
x
8mm
R744,745,
10K
ohm
4
Binding
Hd.
Tapping
Screw
,
844
845
HEADPHONE
P.
C.
B.
ASS’Y
|
3
x
10mm
:
R735,736,
1K
ohm
5
Binding
Hd.
Tapping
Screw
VOLUME
P.
C.
B.
ASS’Y
737,738,
79
141-4-250T-62402
|
P.C.B.
Ass’y,
Headphone
1
3
x
12mm
=
739
4-240T-29971
|
Socket
:
1
Binding
Hd.
Tapping
Screw
74
141-4-250T-61971
|
P.C.B.
Ass’y,
Volume
R835
836,
1K
ohm
5
R766,866
FP-Carbon
270
ohm
P-type ZW}
2
4x8mm
VR701,801
4-220T-03400
|
Variable
Resistors
837,838,
Spring
Washer
3
x
10
x
1t
839
External
Tooth
Lock
Washer
R746,846
1.5K
ohm
2
3x
6.5t
x
0.45t
R747
847
330
ohm
2
AC
POWER
SWITCH
P.C.
B.
ASS’Y
GRAPHIC
EQUALIZER
CONTROL
P.
C.
B.
ASS'Y
R750,751,
27
ohm
4
3
:
:
Sse
ont
are
Aniee
Boe
Seren
;
2,
141-4-250T-62573
|
P.C.B.
Ass’y,
AC
Power
Switch
S
175
141-4-250
C.B.
Ass'y,
Graphic
Equalizer
:
ohm
4-238T-30100
|
Switch,
Power
ELECTRICAL
PART
|
Control
R743
843
3.3K
ohm
2
|
|c901
4-223T-12100
|
Capacitor
0.01uF
400V
4-300T-GO600
|
Power
Transformer
1
VR703,704,
4-220T-03500
|
Variable
Resistor
5
R741,
5.6K
ohm
1
141-4-381T-04200
|
Bracket
Fuse.
4-243T-84971
|
Power
Cord
;
705,706,707
|
|
141-2-368T-26100
|
Heat
Sink
4-240T-16571
|
Socket,
TUNER
AC
1
‘CAPACITORS
:
.
4-234T-10583
|
Fuse,
T800mA
250V
(F901)
1
C720,820
Electrolytic
1uF
50V
2
4-234T-10588
|
Fuse,
T2.0A
250V
(F701,801)
2
C722,822
Electrolytic
0.33uF
50V
2
141-2-243T
09800
|
Base
.
4
C724
824
Mylar
0.082uF
+10%
50V
2
141-2-327T-26100
|
Insulator
6
C726,826
Mylar
0.022uF
+10%
50V
2
C728
828
Mylar
0.0047
uF
+10%
50V
2

SCHEMATIC
DIAGRAM
M
|
[
MAIN
AMP
PCB.
POWER
SWITCH
PcBIA\
|
PHONO
AMP
PCB.
1C701(1/2)
AN
O : 0901 0S135D
R701.
1.5K
ger,
m3,
Neer
5
iy
o
R903
1
+
601
704
Jerns
od
oat:
in|
|
SWITCH
|
VOLUME
seal
ree
A
ee
|
cB.
jPce.
ia
a
3
:
i]
: fy VR7 01 8
250KCX2 ‘
C=) he
']
i]
A
et 3/5V
dita
'
A
220V
&110V
2
50H
PHONO
(S)
its.
>
>|
2
C717
a
~“
gla
0,01
bay
N
R
S
&
25%
3
:
L
[
Se
or.
oO
oO
a?ls
oor |
LAMP PCB.
i cues
O| TUNER AC
ee -
18V
ewer
IC 701(2/2)
ROO4
1K
LA6458SS
1
|
PCB.
meer
e o 5 O
OmmM w
10702 ee
S26 iG v is O i
|
2 in|
0 ae OD oe ee x Esa ONE |
) ea, CB
ROO2 1K C002 Z20P-—1t—H Z R766
at O ROOG6 1K aaa €006 220P>— i J I 2z0fv2wy |
FC x008 1K yy __co0s_220°5 IF aoe J_ R866 |
ROOS
1K
=
C005
_220P'—||
A
SLP251B
x5
oo SS Se OOO SEE «V1 20 a ° 7/5: —m= OOO =
GRAPHIC EQULIZER & AMP PCB. C730 tounev SSASGSEL Se or6G ce SPEAKER SPEAKER
; 1 SWITCH TERMINAL
| 33,7V PCB. '| PCB
D703 (a
Q701~
705
0708
ite
C
)aQ7i2
2SC536G SP nei cal &™ \< aay fe
Q701 iz ieee 0.01 R758
> R742
|
330K
:
:
:
2
co07
L
Ki) oa
C732
eel atal
C724. 0,082
C728 .0,0047
C726. 0,022
2v or)
c7341Q710.711 “Ss
470P | 25C2362G
C738 0,047
1SK yR703~707 77
250KWX2 to
S1-+-»POWER SW (ON)
S2--*>SP SW(ON)
R763 33 ca08 220.u/35V
S4 ++. FUNCTION SW
o
a
> R8S8
sd (AUX)
R873 so
al tL nor R059 Q712 2SC2274EK ee ca ae
e A 4). Q713 2SA984EK (OFF)
co Q714 2SC3179Y S7++++HIGH FILTER SW
Cy = Q715. 2SA1262Y (OFF)
Rea S} oo Q716 2SD61Z2E |
ibe | es Q815 , 3
0
R857
C835
C822
C824
C826
+)
Te R836 Tee
R825 R830 >R826 R831 >R827

WIRING DIAGRAM
220V &110V
50Hz
Mite
thaiee
Q8i4
Q816
Q8is
715
an
Q71s
PHONO
TUNE
R
AUX
PLAY
REC
|
ie R L R is
TO TUNER AC 18V
|
PHONO AMP PCB.
MAIN AMP PCB.
GRAPHIC EQUALIZER PCB.
a8
SWITCH PCB. FUNCTION
SWITCH
PCB.
SPEAKER
TERMINAL
PCB.
LAMP PCB
mae
HEADPHONE.
PCB,
R768.
VR701
t|
| VR 801
VOLUME PCB.
SPEAKER SWITCH PCB.
HEADPHONE
LED METER PCB.
BALANCE PCB. GRAPHIC EQUALIZER CONTROL PCB
Q701~705
-Q801~ 805
POWER SWITCH PCB.
}- s00ee?2PSC536
Gey |
OE
-— Q706.806 ++---++ 2SA608
Q707.708
Qso7, oe aed
Q709,809 --+-++++2SA1016
es Oe 2502362
Q810.811 |
Q7123 B12 ieee tA ISCIZTS
OPIS BIe avian 2SA9B4
Q714,
814
Cee
enens
25C
3179
Q715,
B15
see
wee
2PSAIZ
62
Q716.816 s+e-e +e, 2SD612
B
C
E
ICTOL +++ seen eee LA6458
IC70Z vere ree eees BA6124

PARTS LIST
mom
[mm
[om
[ow
LAMP
P.
C.
B.
ASS’'Y
141-4-250T
62674
P.C.B.
Ass’y,
Lamp
4612T-17400
|
Lamp
12V,
100mA
SPEAKER
TERMINAL
P.
C.
B.
ASS’Y
141-4-250T-62773
|
P.C.B.
Ass’y,
Speaker
Terminal
4-237T-110717
Terminal
Board
009,
‘010
C007
,008
Mylar
0.0056uF
+£10%
50V
LED
METER
P.
C.
B.
ASS‘Y
|
141-4-250T-645714}
P.C.B.
Ass’y,
LED
Meter
iC
LB1403
)
Ic BA6124/°°
LED SLP251B Green
Electrolytic 10nF 16V
Carbon 10K ohm T-type “W
BALANCE P.C. B. ASS’Y
141-4-250T-6467
1
P.C.B.
Assy,
Balance
4-220T-03600
|
Variable
Resistor
Carbon 1K ohm T-type 4W
Carbon 1K ohm P-type “W
IC BLOCK DIAGRAM
LA 6458S (Dual Operation Amplifier)
_ Vcc
BA6124 (LED Level Meter)
ee
Constant
Curtent
SANYO ELECTRIC TRADING CO., LTD.
33, -Hiyoshi-cho 2-chome, Moriguchi-shi,
Osaka-fu, 570 Japan.
Aug./’82/2000 KM Printed in Japan.