Sony CFD-444L - Page 27

FocurÆracking
Gain
Adjustment
A
frequency
responce
analyzer
is
necessary
in
order
to
perform
this
adjustment
exactly.
However,
this
gain
has
a
margn,
so
even
if
it is
slightly
off,
there
is
no
problem.
Therefore.
do
not
perform
this
adjustment.
Focus/tracking
gain
determines
the pick_up
follow_
up
(vertical
and
horizontal)
relative
to
mechanical
notse
and
mechanical
shock
when
the
2_axis
device
operat
e.
.
However,
as
these
reciprocate,
the
adjustment
is
at
the point
where
both
are
satisfied.
o
When gain
is
raised,
the
noise
when
the
2_axis
device
operates
increases.
a
When gain
is lowered,
mechanical
shock
and
skipping
occurs
more
easily.
o
When
gain
adjustment
is
off,
the
symptoms
below
aPpear.
The
following
is a
simple
adjustment
method.
-
Primary
Adjustment
_
Noto:
Since
exact
adjustment
cannot
be performed,
remem_
bej the positions
of
the
controls
befole performins
the
adjusrment.
If
the
positions
"ft",
th";;i_;;;;;j;;;_
ment
ale
only
a little
different,
return
the
controls
to
the
original
position.
Procedure:
l.
Keep
the
set
horizontal.
/tf
the
set
is
not
horizontal,
this
adjustment\
I
c€nnot
be
performed
due
to
the
gravity
against
I
\the
2
axis
device.
I
2.
Insert
disc
(yEDS-18)
and
press
)pLAy
button.
3.
Connect
oscilloscope
to
CD
main
board
Tp
(FE).
4.
Adjustment
RV705
so
that
the
waveform
is
as
shown
in
the
figure
below. (focus
galn
adjustment)
VOLT/OI
V:
,t
OO mv
TIME/D|V:
2
mS
a
Incorrent
Examples (DC
on
adjusted
waveform
)
level
chaDges
more
l@mV
OV
than
VOLT/DI
V:
TIME/DIV:
IOO
mV
2mS
high
focus
gain
25O
mV
OV
VOLT/DIV:
TIME/DIV:
fOOmV
2mS
5.
o.
Coinect
oscilloscope
to
CD
main
board
Tp
(TE).
Adjust
RV704
so
that
the
waveform
is
as
shown
the
figure
below. (tracking
gain
adjustment)
ln
Gain
Symptomt
Foqr3
Trrcking
.
The
time
until
music
slarts
becomes
longer
for
STOp
-+
DPLAY
or
automatic
selection
(L<l
tùlbuttons
pressed.)
(Normally
takes
about
I seconds.)
low
low
or
high
o
Music does
not
start
and
disc
continues
to
rotate
for
STOP--'DPLAY
or
automatic
selection.(
La
lùl
buttons
pressed.)
low
.
Disc table
opens
shortly
afrer
STOP--'>pLAy.
low or high
.
Sound is
interrupled
dur-
ing
PLAY.
Or
time
counr-
er
display
stops
progress-
ing.
Iow
o
Mole
noise
during
2.axis
device
operation.
high
high
low
focus
gatn
-21-