Sony CFD-K10 - Focus;Tracking Gain Adjustment; Primary Adjustment

CFD.KlO
ENC
Focus/Tracking
Gain Adjustment
A frequency
responce
analyzer
is necessary
in order
to
per-
form
this
adjustment
exactly.
However,
this
gain
has a margin,
so
even if it is
slightly
off,
there is
no
problem.
Therefore,
do not
perform
this
adjust-
ment.
Focus/tracking gain
determines
the
pick-up
follow
up
(ver-
tical
and horizontal)
relative
to mechanical
noise
and
shock
when
the 2-axis
device
operate.
However,
as
these reciprocate,
the adjustment
is
at the
Doint
where
both are
satisfied.
r
When
gain
is raised,
the noise
when
the 2-axis
device
operates
increases.
oWhen
gain
is lowered,
mechanical
shock
and
skipping
occurs
more
easily.
The
following is
a simple
adjustment
method.
-
Primary
Adjustment
-
Note:
Since
exact
adjustment
cannot be
performed,
remem-
ber
the
positions
of the
controls
before
performing
the
adjustment.
If the
positions
after
the
primary
adjustment
are
only
a little
different,
return
the controls
to the
original
Dosition.
Keep
the set horizontal.
If
the
set is not
horizontal,
this adjustment
cannot
be\
performed
due to
the
gravity
against
the 2-axis
device.
/
Connect oscilloscope
to TP701
pin
O
(VREF)
and
pin
@
Procedure
:
audio'CD
board
TP70l
oscilloscope
(dc
range)
(FE-t)
on audio-CD
board.
3.
Insert
disc
(YEDS-I8)
and
press
D
PLAy
button.
4.
Adjustment
RV702
on audio.CD
board
so that
the
waveform
is
as
shown in
the figure
below.
(focus
gain
adjustment)
.
Incorrent
Examples
(DC
level
changes
more
than
on adjust-
ed
waveform)
low tocus
gain
VOLTIDIV : 1O0mV
TIME/DtV
: 2nS
VOL||D|V
: loonv
TIME/Dlv : 2mS
VOLT
lDlV
: lo1nv
TIME/DlV:
2mS
l0OmV
75mV
OV
.
When
gain
adjustment is
off,
the symptoms
below
appear.
Gain
Symptoms
Focus
Tracking
.
The
time until music
starts
becomes longer
for STOP
--D
PLAY
or automatic
selection.
(K<,
>> buttons
pressed.)
(Normally
takes about
1 sec-
onds.)
low
low
or high
r
Music
does not start
and disc
continues
to
rotate
for
STOP
--D
PLAY
or automatic
selec.
tion.
(K<,
>)| buttons
pressed.)
low
r
Sound
is interrupted
during
PLAY.
Or time
counter
display
stops
progressing.
low
.
More noise
during
2-axis
device
operation.
high
high
high
locus
gain