Sanyo JT250L User manual

SERVICE MANUAL
STEREO TUNER
JT250!
Looe eID VI Le
(EUROPE)
This
is
a
service
manual
for
model
JT2501L
and
only
items
changed
from
model
JT3OOL
are
indicated.
For
other
items,
refer
to
Service
Manual
for
model
JTSOOL
(WM-8681)}.
#
mark
represents
a
non-interchangeable
part.
(PACKING & ACCESSORY)
141-6-133T-39902
141-6-410T-83302
141-6-133T-46201
-141-6-410T-83308
~ (CABINET)
1 141-0-122T-46201
4 141-2-163T-81330
5 141-2-163T-91900
12 141-2-126T-41102
16 141-2-160T-09700
17 141-2-160T-16500
27 141-2-247T-11800
141-0-122T-46205
141-2-163T-81340
141-2-163T-9 1930
(CHASSIS)
141-2-126T-41109
141-2-160T-09701
141-2-160T-16501
Not used
Individual Carton +
Instruction Manual | #
Front Panel Assy
#
Rotary Knob, Timing #
Rotary Knob, Selector #
Back Lid . i
Push Button, MONO/STEREO #
Push Button, POWER SW #
Sheet
. ° Ty ic . ~~ ee 1
| | Add this sheet to Model JT300L Service Manual. |
Apr./’83/2000 KA Printed in Japan
SANYO ELECTRIC TRADING CO., LTD.
33, Hiyoshi-cho 2-chome, Moriguchi-shi, Osaka-fu, 570 Japan.

SERVICE
MANUAL
STEREO
TUNER
JT 300L,
(EUROPE )
SPECIFICATIONS
NOTE:
The
below
mentioned
specifications
are
mainly
based
on
the
[HF
measurements
standard.
They
can
therefore
not
directly
be
compared
with
specifications
based
on
the
DIN
standard
or
other
standards.
FM section
87.5 — 108 MHz (nominal)
Frequency
range...
eee
cece
eee
eee
Usable sensitivity .............2++.+ 2,0NV (mono)
Signal
to
noise
ratio
(1
mV
ANT.).....
/.
70
dB
(mono)
Hermonic
distortion
(1kHz)..:...5.+.
0.2%
©
©
..
Frequency
response
......-0+0+0%
2,30
Hz
—
15
kHz
Stereo
separation
(1
KHz)
......
.:+...+
40dB
IF
rejection
2.0...
err
Soyaee
Ode.
|
*
Aerial
input...
2...
Coutts
sae:
20
ohms
unbalanced
AM (MW and LW) section
Frequency range... 2. ee ee ee eee
Sensitivity (ferrite aerial) |
Signal to noise ratio (5 m V/m)
Selectivity
....+e+eeeee-
Pe
ee
eee
General
Power requirements |
Power consumption
Dimensions (Approx.)
se see ene meeeereterteeaes 2 8 *# fF ee ee He ee ee
MW: 531 —: 1602 kHz
LW: 150 — 285 kHz
MW: 350 wV/m, LW: 500 wV/m
MW: 40 dB
30 dB
AC: 18 V, 50 Hz |
AC: 18 V, 300 mA (maximum)
420 x (W) x 220 (D) x 85 (H) mm
(16-1/2” x 8-5/8” x 3-3/8”)
2.6 kg (6 Ibs.)
* Specifications subject to change without notice.
NOTE:
The
power
switch
is
mounted
on
the
secondary
side
and
does
not
disconnect
the
set
from
AC-powe
r,
even when switched off.
WM-8681
ASA

HOW
TO
REMOVE
THE
PANEL
. Pull out the power cord from outet. _
1.
Cabinet
|
| :
Remove
Four
screws
”a’’
(binding
head
tapping
Screw
4
x
8
mm)
and
one
screw
"b”
{binding
head
tapping
screw
3
x
8
mm)
securing
the
cabinet,
a
2. Front panel | |
Pull
out
rotary
knobs
(Tuning
and
Band
Select).
Remove
six
screws
“'c’’
(binding
head
tapping
screw
3
x
10mm)
securing
the
front
panel.
3.: Bottom lid |
Remove
two
screws
“‘d”
(binding
head
tapping
screw
3
x
6mm)
securing
the
bottom
lid,
and
slide
the
lid
from
left
side.
|
|
4.
Bracket
dial
scale:
| : :
Remove
three
screws
“‘e”
(binding
head
tapping
screw
3
x
8mm)
securing
the
bracket
dial
scale.

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ADJUSTMENT CONNECTIONS
| ' ¢ FM-SG
croc
FMCSTEREO
MODULATOR
(6)!
CED
ex
Ser
haste
*ourPur
|
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t
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em
Sipe caren sere ion Beet F
FREQUENCY
COUNTER
AM ADJUSTMENT CONNECTIONS
TEST LOOP ANTENNA
ai OSC- oO)
:] OUTPUT Ee
DISTORTION METER
ore @® 0 |l~ yo a }
_— a |
fen 9

PARTS LIST
PACKING & ACCESSORY .
CABINET
CHASSIS
141-6-133T-39902
141-6-144T-85000 |
141-6-231T-35600
1416-231T-25350
141-6-33 1T-1 1600
141-6-415T-23500
1416-4157 -32301
141-6-410T-83302 |
4-245T-00700
141-0-122T-46201
141-2-111T-54900
141-2-125T -25900
141-2-163T-8 1330
141-2-163T-91900
141-2-174T-11200
141-2-221T-10600 |
141-2-126T 41102
141-2-125T-30100
141-2-146T -30601
141-2-231T-013906
141-2-160T-09700
141-2-160T-16500
141-2-511T-24500
1410566T-13600
141-2-329T 08600
141-2538T-13200
141-2-855T-38700
141-2-340T-05003
141-2-447T-96001
141-2-661T-71300
141-0-661T-36300
141-2-247T-11800
141-2421T-20900
141-2-310T-76000
141-2472T-01001
141-2464T-14400
141-2-464T-11800
141-2-464T-20600
141-2-3.10T-81 100
141-2-310T-81200
141-2-852T-43500
141-2-247T-12500
141-2-464T-29900
141-2-464T-39500
123-2-472R-00401
| 441-2-247T-11801 |
Individual Carton
Foam Plastic Case
inner Polye Cover, Set
Inner Polye Cover, Inst. M
Protector Sheet |
Notice
Notice |
Instruction Manual
Antenna
Front Panel Ass’y
Cabinet
Bottom Lid
Rotary Knob, Tuning
Rotary Knob, Selector
Stand
Bracket Panel
Back Lid
Bottom Lid
Dial Scale
Bracket Diai Scale
Push Button, MONO/STEREO
Push Button, POWER SW
Pointer
Tuning Shaft Ass’y
Reflector
Drum
Spring Coil
Rope
Cushion
Pulley
Pulley Ass’y
Sheet
Special Screw
Bracket, Pulley (Left)
Lug
Fixer
Fixer, AC Cord
Fixer, Lead
Bracket, Pulley (Right)
Bracket, Pulley (Center)
Spring Wire
Sheet
Fixer, Output Lead _
Fixer, Output Lead
Lug, Earth
Sheet, Shield Plate
| Pan. Hd. Tapping Screw
2.3 x 6mm
Pan. Hd. Tapping Screw
W/Washer 3 x 6mm
Pan. Hd. Tapping Screw
W/Washer 3 x 8mm
Pan. Hd. Tapping Screw
3x 20mm
Binding Hd. Screw 3 x 8mm
Binding Hd. Tapping Screw
3x 4mm .
Binding Hd. Tapping Screw
3 x 6mm
Binding Hd. Tapping Screw
3 x 8mm
pee Hd. Tapping Screw
3x 10mm
Binding Hd. Tapping Screw
4x8mm
Pan. Hd. Screw W/Spring
Washer 3 x 4mm
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FIXING PARTS
Y12
Y13
Y14
ELECTRICAL PARTS
TUNER P.C. B. ASS‘Y |
71
CT3,4,5
CT6,7
L701
L102
L103
L104
L106
L108
L109
T201
T202,203
T204
T205
T206,207
T208
T301
CF201,20
D206
D203 ,204
D207 ,208
D201 202,
102,103,
101,205,
301 ,302
D303
D304
€107
C209
C106
C206
C114
C108
C116
4-243T -19974
4-236T-20000
4-240T-32800
141-4-250T-15704
4-224T-08372
4-224R-11600
4-224T-15471
4-265T-03700 |
4-265 T-03800
4-265R-15100
4-265T-51340
4-258T-28640
4-258T-28840
4-253T-15014
4-2561-05146
4-256R-19540
4-256T-04540
4-256T-04040
4-256R-00141
4-256R-00241
4-255T-02900
4-256T-81000
141-2-322T-40800
141-2-322T-18900
141-2-322T-72101
4-238T-58200
4-238T-39000
4-222T-97572
4-222T-97574
4-222T-97578
123-2-471R-10900°
4-240T-11200
4-240T-11271
CAPACITORS
4-257T-52701
Pan. Hd. Screw W/Spring
_ Washer 3.x 8mm
Hexagon Hd. Bolt 2.6 x 6mm
Hexagon Nut 9¢
Antenna Coil Ass‘’y
Lead Cord
Plug
Socket
P.C.B. Ass’y, Tuner
Variable Capacitor
Trimmer
~—-——7~"OO0O0<<<
MX Coil
1 F Filter.
Shield Plate
Shield Plate
Shield Plate
Rotary Switch
Push Switch »
Semi-Variable Resistor 1K ohm
Semi-Variable Resistor 5K ohm
Semi-Variable Resistor {OOK ohm
Core
Socket, 3p
Socket, 4p
IC LA3350 S
1C LB1426
Transistor 2K212
Transistor 2SC2840
Transistor 2SC930 CONV
Transistor 2SC1571
| Transistor 2SC930 IF
Transistor 2SC930 IF
Transistor 2SC536 AUD
Transistor 2SC945
Transistor 2SA608
Transistor 2SD325 _
Zener Diode GZA13Y
Diode 1$189
Diode 1$189
Diode 18189
Diode DS442X
Diode DS17
Diode DS18
Ceramic 1pF NPO 40.5pF 50V
Ceramic 2pF +0.25pF 50V
Ceramic 3pF NPO £0.25pF S50V |
Ceramic 6pF +0.25pF 50V
Ceramic 10pF NPO +0.5pF 50V
Ceramic 6p>F NPO +5% 50V
Ceramic 15pF +5% 50V
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PARTS LIST
10121
Ceramic 15pF N1500 410% 50V} 1
-Ci01 Ceramic 18pF N220 +5% 50V 1 )
C105 Ceramic 18pF N220 +5% 50V 1 316,
C113
Ceramic
18pF
N220
+5%
50V
1
R212
470
ohm
1
C102
Ceramic
20pF
§§§
45%
50V
1
R201
560
ohm
1
C210
Ceramic
30pF'N750
+*5%
50V
|
1
R208
680
ohm
1
C115.
Ceramic
33pF
NPO
45%
50V
1
R118,217,
1K
ohm
6
C221
Ceramic
100pF
5%
SOV
1
218,219,
C109
Ceramic
220pF
15%
50V
i
220,224
:
C216
_
Ceramic
220pF
45%
50V
1
R215,324,
1.5K
ohm
3
C307,311
Ceramic
560pF
+10%
5OV
2
205
.
C104,217,
Ceramic
0.001nF
+10%
SOV
<
R334,335,
33
ohm
3
218
:
:
336
1.
C204,208
Ceramic
0.0047pF
£10%
50V
|
2
R308
,309
2.2K
ohm
2
C124
~
Ceramic
2p
NPO
+0.25pF
50V
1
Rii1
2.7K
ohm
1
C130
|
Ceramic
180pF
NPO+5%
SOV
1
R107,115,
3.3K
ohm
6
C125
.
Ceramic
33pF
+5%
50V
1
R303,304,
| 7
C337
+
Ceramic
100pF
-
+5%
50V
1
305,321
~
C132
Ceramic
220pF
+5%°
50V
1
R325,122
5.6K
ohm
2
C140
;
Ceramic
47pF
.
5%
50V
1
R318,319
4.7K
ohm
2
C141,
143
|
.
Ceramic
0.01nF
+80—20%
50V
2
R105,221,
5.6K
ohm
3
C142 = Ceramic 0.022uF +80—20% 50V; 1 222.
C103,110,
Ceramic
0.
OipF
+80—20%
"14
R306,307,|
|
8.2K
ohm
5
141,112,
50V
310,314,
117,201,
320
.
202,203,
R114,213,
10K
ohm
7
325,333,
126,132,
334,335, 331,223,
336,133
344
:
C112,205,
Ceramic
0.022uF
+80—20%
10
R233
1.2K
ohm
1
207,211,
5OV
|
R127
,231,
3.3K
ohm
4
212,213,
234,134
223,225,
R135,130
1K
ohm.
2
316,222
foe
R110,119
12K
ohm
2
C127
BC
Con
0.0033nF
220%
50V
1
R109,204,
15K
ohm
4
C308 ,312, BC Con 0.0022nF +20% 25V 2 226 333
C118,119,
~~
BC
Con
0.01nF
+20%
25V
4
R
106,203,
22K
ohm
4
219,220
|
225,302
C315
|
BC
Con
0.047pF
+20%
25V
1
R113,125
39K
ohm.
2
C310,314
|
°
BC
Con
0.0033uF
+20%
25V
2
R322
328,
56K
ohm
3
C302,303 - BC Con0.015uF +20% 25V 2 229
C227
|}
BCCon0.047uF
+20%
25V
1
R332
~
|
68K
ohm
1
Ci20
Styrol
340pF
+5%
50V
1
R214
82K
ohm
1
C317
|
PP
Con0.0015nF
15%
100V
1
R101,227,
|.
100K
ohm
5
C228
BC
Con
0.01uF
+20%
25V
1
228,313,
.
'
C332
Electrolytic
470uF
25V
oo
317
-
C329
Electrolytic
470uF
16V
1
R327
...
1.450K.0hm
1
C301
Electrolytic
220uF
16V
1
R123
.
100K
ohm
1
C331
Electrolytic
100nF
25V
1
R230
27K
ohm
1
C214,330
|
Electrolytic
100uF
16V
2
R323
18K
ohm
1
C328
| .
Ps
Electrolytic
10uF
16V
1
R311,315
470K
ohm
2
C229
Electrolytic
4.7uF
25V
1
R330
1M
ohm
1
i
C215,224,|
j
Electrolytic
47
BF
25V
8
H
R2
2
|
|
H
390K
chm
:
Hy
1
306,326,
|
R301
Solid
82
ohm
P-type
“ZW,
+10%
4
321,324
:
|
-R337
100
ohm
P-type
#%W,
£10%
4
C309,313
Electrolytic
O.14F
50V
2
R340
Solid
390
ohm
P-type
“%W
+10%
|}
1
C320,327
2
Electrolytic
1F
50V
2
R338
FP
5.6
ohm
P-type
%4W
£5%
1
C304
,305
|
Electrolytic
O.1uF
SOV
2
R341
Metal
150
ohm
P-type
2W
15%
1
C318,322
|
.
Electrolytic
0.47uF
50V
2
R342
Solid
470
ohm
P-type
“ZW
410%}.
1
C323
Electrolytic
1uF
50V
4
R131
390K
ohm
1
C319
Electrolytic
0.22uF
50V
1
:
:
C226
Electrolytic
10uF
25V
1
:
|
C128
{1
Styrol
250pF
+5%
50V
1
C126
©
BC
Con
0.0022uF
+20%
25V
1
METER
LED
P.
C.
B.
ASS’Y
RESISTORS
141~4-250T-64200
|
P.C.B.
Ass‘y,
Meter
LED
Alt
Resistors
are
Carbon
T-type
+5%,
“W,
unless
LED
SIP151B
Red
otherwise
noted.
|
LED
SLP251B
Green
R102,117,
10
ohm
.
3
128.
R112,211, 56 ohm 3
124 | |
-R108,116, 100 ohm 6
209,326,
329,121 es
R216 % | 180 ohm 1
R206 a 220 ohm 1
R103 ,104 ; 270 ohm 2

PARTS
LIST
|
|
EXPLODED
VIEW
rom] rome | __en_itn
POWER SWITCH P. C. B. ASS’Y
141-4-250T-15901 P.C.B. Ass’‘y, Power Switch
4-238T-41200 | Push Switch
Ceramic 0.01uF +80—20% 50V
LAMP P, C. B. ASS’Y
141-4-250T-64300
4-612T-17400
P.C.B. Ass’y, Lamp
| Lamp
POINTER LED P. C. B. ASS’Y
P.C.B. Ass’y, Pointer LED
) LED SLP135BB Red
141-4-250T-18902
OUTPUT P. C. B. ASS'Y
1414-233T-22502 P.C.B. Ass’y, Output
4-265R-12600 | VHF Coil
Ceramic 47pF +10% 50V |.

SCHEMATIC DIAGRAM
Q101 Q102 | Q201 Q202 Q203
25K212F —rioz 19 2SC2840E 2SC930E 25C930D - 2SC930E rpg R217 1K
108
|
ay
202
eB
--
120
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EMUANT.
C102
cn
ala
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is
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aes a. 4 ) 8101 3 oe te) —_ 15 189
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150
s
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100
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=
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5
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470
L193
39k
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|=
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1M
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|
|
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3-2
:
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[st
=>
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18V
AC
RN2
CNB
“le
31
24.3
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B56
4
ON
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0,01
73.7
b.3
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|
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Shiites FUNCTION SWITCH
EE
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in = | = a
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S2......MONO
STEREO
SWITCH
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a,
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ec
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SWITCH
awWMAQMa
a
(Y¥)
r
oe
D405
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VOLTAGE INDICATED IN-——“ move. 2 1 2.38 8 Der Pt35 8
' AM D a ra) Pas ‘ !
—10 —

WIRING DIAGRAM
IC302- - -LB1I426
SLP151B
D401
SLP251B
IC 30!1---LA3350
L105
L. wf. ~ J. ~ -f- — -J-- fe LJ
Q105 Q 104
2SC930E 2SC930E
ys
Q101, Q106: --2SK212
, G (B)
Q102:--25C2840
D 2(C)
(E)
Q103,Q104 ,Q105
Q201,Q.202, Q203 --2SC930
Q204,Q301 ,Q302:: 2SC536
Q303,Q304:-2SC945
Q305- -2SA608
STEREO
Q 302
2S5C 536G
Q306: -250325
SLP135B
OUTPUT
R L
18V

IC BLO
CK DIAGRAM
LB1426
(5
DIGITS
LEVEL
METER
DRIVER)
. ae
IN 10
noe
IN ©
ey a
Roy
:
Aizae
eee
mae
i
> beste hemlet
Ff
Pa
5
4}
146 7 34 124
OUT GNO 05 04
LA3350
Sper
ae
geo
gee
ae
gue
AS
med
!
{
H
)
|
|
INPUT
!
|
l
|
{
1I9KHz
cHeck
2)
:
4
|
|
|
z
i
l
{
L-----4)--©
L
R
SEPARATION
SIGNAL
|
CONTROLL
OUTPUT
(PLL FM Multiplex Stereo Demodulator)
GROUND Vee. 12V
: PHASE COMPARATOR FOR LAMP
- LOW PASS FILTER
~ PHASE COMPARATOR FOR V.C.O
: VOLTAGE CONTROLLED OSCILLATOR
. DIRECT COUPLED TYPE FLIP-FLOP
poe oe ee
i
1
‘
SANYO
ELECTRIC
TRADING
CO.,
LTD.
33,
Hiyoshi-cho
2-chome,
Moriguchi-shi,
Osaka-fu,
570
Japan.
Aug./'82/2000
K-M
Printed
in
Japan.