Technics SL-1200MK2 Service Manual Supplement page 17

I 3 I 4 I 5 I 6 I 7 I 8 I 9 10
I
A
B
D
1 I 2
• SCHEMATIC DIAGRAM
(This schematic diagram may be modified at any
time with the development of new technology.)
Notes:
1. $201,202
2, $203
3. $301
4. $401
5. $601
6. 8602
: Speed selector switch.
: Start/stop switch.
: Pitch control reset switch in "off" position.
: Stylus illuminator switch in "off" position.
: Power switch in "on" position.
: Voltage selector in "220 -- 240" position.
7. The voltage value, and waveforms are the reference voltage values of this unit
measured by DC electronic voltmeter (high.impedance) and oscilloscope on
the basis of chassis. Therefore, the voltage value and waveform may include
some error due to the internal impedance of the tester or the measuring set.
* _ is the voltage when turntable is in stop.
*( ) is the voltage when turntable is in rotation. (at 33 rpm)
8. +B voltage lines.
9. Important safety notice.
Components identified by ,_ mark have special characteristics important for
safety. When replacing any of these components, use only manufacturer's
specified parts.
10. The part No. of diodes mentioned in the schematic diagram stand for produc-
tion part No, Regarding the part No. with O mark the production part No.
are different from the replacement part No. Therefore, when placing an order
for replacement part, please use the part No, in the replacement parts list.
• Terminal guide of transistors, diodes and IC°s
AN6675
13
24 _-'"
1"
[ ,MN4011B t 14
Pi. I
2SC 1328
svDPR39o2s-9
SVDSLH54VT3
AN6680
13
2A_2
l
2SC 1846
B
SVDGL-9PG2
K
AN6682
2SD1265
2SD637 2SB641
2SD636 2SB643
SVDS1RSA20F
2 1 7
I 4
MA150
M"A1051
mork
POWER SOURCE CIRCUIT
A
POWER
SSOI
A
AC 120V
( 50/60Hz
Product for U,S.A.
C601 R60I
0047 47
(O.SW)
D301
MA1051M
5.IV ZENE
-OFP,OV
S. 6V
IC302
MN4OIIB
PITCH CONTROL
ON/OFF SELECT
• S3OI-ON, OV
e S3OI---OFF5.6V VR303Centel
IS3OI_._ON O,28ms
16301
r+-m
RT2 CT2 FRC GND FO CTI RTI FI
,3--(
VR303 Center
3.eps 1C30 I
AN6682
ssv PITCH CONTROl
Pitch control 1"O% adjustment
*STOP
33rpm--2Om$
45 rprr.--L5 ras
*ROTATION
Broke
• ROTATION
q l m
m
Iv i I
33rpm-+2Oms
45tpm--t5 ms
¢2t0
0.22
v0
I I
040 I
SVDGL-9NG2
PITCH I NOICATOR
PITCH CONTROL
VR303 20KB
S3Ol
Reset
L_OK8
Pitch control gain adjustment
s_ 33
D2OI,202
SVDPR3902S'9
SPEED INDICATOR
I
Q2,3
2SD637
REGULATOR
DI
_SVDSIRBA20F
RECTI FI ER
STOP
R204
2.?K
C204
Pe FAO FAI ECR R S.S T az FG_ FGO r6I
=c2ol AN6680 CONTROL
r ¢2t?
0202
S60€1_)
IOK
0201
2SCl846
REGULATOR
4, I93MHz
O 202
2SD637
LED DRIVER
I D203 D205
L
D204 D206
45
D203 _ 206
SVDSLH 54VT3
STROBE
(
/!
ST
IL
G --19-- --20--