Technics SL-1200MK2 Service Manual Supplement page 19
Turntable system
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Also See for SL-1200MK2:
- Service manual (49 pages) ,
- Service manual supplement (40 pages) ,
- Operating instructions manual (34 pages)
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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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