Technics QUARTZ SL-MA1 - Page 12

@ TECHNICAL GUIDE
This
unit
is
equipped
with
an
electronic
drive
arm
employing
unique
DD
arm
drive
motor
mechanism
in
which
the
newly
developed
vertical
and
horizontal
drive
motors
are
unistructurally
included.
It
ensures
smoother
operation
without
applying
load
to
the
arm
and
cartridge
during
auto
lead-in
or
auto
return
as
compared
with
a
mechanism
type.
Also,
infrared
detection
system
is
employed
for
the
detection
of
record
and
size,
and
while
non-contact
type
auto
mechanism
utilizing
magnetic
characteristics,
for
the
detection
of
record
ends.
Horizontal Drive coil
control
circuit
Arm
position Lead-in DD
cheat Serie mater
pe =
: ‘ Brake
position det.
aie skating det.
coil
Vertical control circuit
Record
size
;
Cueing
detection
circuit
ey
Stylus
position
det.
Muting,
Brake
System
micom
tay
8M
MN1420
Power
supply
control
circuit
Display
LED
Quartz DD
module
Power
ii switch
Key matrix
circuit
System Block Diagram
e Schematic diagram of electronic drive arm
* Cueing down
Tonearm
——__.. Magnet
Horizontal = =
ee detection coil — = Vertical
Vertical drive coil ~~. detection coil
Back yoke
Vertical drive coil
-~ (inner periphery) y
~~~
Vertical
detection
coil
*
'
(outer
periphery)
Cueing
up
Horizonta! drive coil
— —— Back yoke