Technics SL-1200MK2

BLOCK DIAGRAM
9V 9V
+_ FG Coil
TURNTABLE DRIVE/CONTROL CIRCUIT
IC201
AN6680
Reference sigr_l generation
FG amplifier, speed and phase
contrOl
Position
detection
50kHz
IClOl
AN6675
45rpm, 15ms
X201
IC201
Strobe drive
Q202 _
I 0.9
33rpm , I0 ms
45rpm , 7.3ms
Strobe
20V
Start/
Stop
S 203
Speed se lector
(45) (33)
S202 SZOI
20V
Brake adj.
VR201
Speed
control
Phase
control
1
III
Turntable drive
Three-phase
full wave PNP
Three-phase
full wave NPN
Power TR
Power TR
Regulator
20V
Pilch control
_tO% adj.
VR301
Pitch control
gain adj.
VR302
Stabi lizer
Frequency
Phase
comparator
I
P,,chooo,,o,I I
VR303
" PITCH CONTROL CIRCUIT
IC301
AN6682
Pitch control
Pitch 0% 262,08kHz
20V
I
$301 "]
Reset I
[
I
• 0 I
VR303 Center 3.8/us I
[
I
i
I
Drive col I
AI
A2
A3
|C302
MN4OIIB
Pitch contro I
on/off select
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