Technics SL-PJ28 - Page 12

MINTERNAL CONNECTION OF FL
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i
DIGITAL
SERVO
SYSTEM
The
newly-developed
digital
servo
system
is
adopted
in
the
servo
circuit
of
the
unit’s
CD
player
instead
of
the
ordinary
analog
servo
system.
1.
The
diagrams
shown
below
represent
differences
between
the
analog
servo
o
and
digital
servo
systems.
The
HEAD
AMP.
output
signals
(i.e.,
focus
error
and
tracksing
error
output
signals)
are
analog.
These
analog
signals
are
converted
to
the
8-bit
digita!
signals
through
the
MN6650.
The
‘MN6650
performs
the
following
adjustments
automatically;
focus
offset,
tracking
offset,
focus
gain,
tracking
gain,
and
tracking
balance
adjustments.
The
outputs
from
the
MN6650
such
as
the
focus
coil
driving
signal,
tracking
coil
driving
signal,
and
traverse
motor
driving
signal
are
converted
to
analog
signals
again
and
sent
to
the
coils
and
motor
to
periorm
proper
servo
control
for
a
disc.
ANALOG SERVO SYSTEM
SVLFYSgs
6 VRs require adjustment
: To EMF demodulation Digital audio
RF
signal
&
D/A
conv.
playback
=”
pobinlhs (Analog processing)
Focus coil
Focus error”
output signal
Tracking error
output signal
:
DIGITAL SERVO SYSTEM
§
Only
1
VR
requires
adjustment
(best
eye
adjustment)
z
‘ To EMF demodulation Digital audio
AF
signet
&
D/A
conv.
playback
o
MN6650
(Digital
servo
processor)
Pu
i
A/D conversion
Focus coil Lens
cial
Traverse coil
Focus error
output signal Tracking coil
Soft
microprogram
Tracking error
output signal
t
'
t
'
1
‘
'
i
‘
4
1
t
'
4
!
y
4
t
1
'