Sony CDP-101 - Focus;Tracking Gain Adjustment Details

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CDP-101
CDP-101
AF
Offset
Adjustment.
Procedure:
oscilloscope
or
vom
(DC
range)
TP9
(R-CH)
O<=
~4
i
TP8
(L-CH)
O——_»>—-O
+
1.
Turn
POWER
switch
on.
(STOP
mode)
2.
Connect
oscilloscope
or
VOM
to
audio
amp
board
test
points
TP8
(L-CH)
and
TP9
(R-CH).
3.
Adjust
RV501
(L-CH)
and
RV502
(R-CH)
so
that
the
oscilloscope
or
VOM
reading
is
DC
0
V.
Adjustment
Location:
Audio
amp
board
RV502_—s«sTP9
TPS
RV501
(R-CH)
—
(R-CH)
(L-CH)
—{L-CH)
we
43-
REFERENCE
Focus/Tracking
Gain
Adjustment
A
frequency
response
analyzer
is
necessary
in
order
to
perform
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
adjustment.:
Normally,
RV205
and
RV301
are
set
in
the
positions
shown
below..
mechanical
center
mechanical
center
midway
between
)
midway
between
MIN
and
mechani-
MIN
and
mechan-
Cal
center
cal
center
19)
MIN
1
MAX
r
MIN
;
(low
gain)
th.
(high
gain)
tr
flow
gain)
(seen
from
component
side}
_—_
{seen
from
conductor
side}
Focus/tracking
gain
determines
the
pick-up
follow-
up
(vertical
and
horizontal)
relative
to
mechanical
noise
and
mechanical
shock
when
the
2-axis
device
operates.
However,
as
these
reciprocate,
the
adjustment
is
at
the
point
where
both
are
satisfied.
@®
When
gain
is
raised,
the
noise’
when
the
2-axis
device
operates
increases.
@
When
gain
is
lowered,
it is
more
susceptible
to
mechanical
shock
and
skipping
occurs
more
easily.
When
gain
adjustment
is
off,
the
symptoms
below
appear.
e
The
time
until
music
starts
becomes
longer
for
STOP
‘>DPLAY
or
automatic
selection
(k@q,p>P>|
buttons
pressed.
(Normally
takes
about
2
seconds.)
low.
or
high
e@ Music does not start and
disc
continues
to
rotate
for
STOP
>
DPLAY
or
automatic
selection
(Kd
PPI buttons pressed.)
e
Disc
table
opens
shortly
after STOP
>
D>
PLAY.
e
Susceptible
to
mechanical
shock.
Even
with
anti-
shock
switch
on,
display
and
sound
skip
when
a
light
shock
is
given.
low or high
e Sound is interrupted dur-
ing
PLAY.
Or
time
count-
er
display
stops
progress-
ing.
e
More
noise
during
2-axis
device
operation.
The
following
is
a
simple
adjustment
method.
—
Simple
Adjustment
—
Note:
Since
exact
adjustment
cannot
be
performed,
remember
the
positions
of
the
controls
before
performing
the
adjustment.
If
the
positions
after
the
simple
adjustment
are
only
a
little
different,
return
the
controls
to
the
original
positions.
oscilloscope
Procedure:
(DC
range)
servo
amp-board
—_—
TP5
O-——-——_0
+
|
|
TP6
O--
-7
1.
Keep
the
set
horizontal.
If
the
set
is
not
horizontal,
this
adjustment
cannot
be
performed
due
to
the
gravity
against
the
2
axis
device.
Put
set
in
adjustment
mode.
(see
page
38)
Insert
disc
(YEDS-1)
and
press
[>
PLAY
button.
.
Connect
oscilloscope
to
servo
amp
board
TPS.
.
Adjust
RV205
so
that
the
waveform
is
as
shown
in
the
figure
below.
(focus
gain
adjustment)
VOLT/DIV: 1V
TIME/DIV:
2mS
@
Incorrect
Examples
(DC
level
changes
more
than
on
adjusted
waveform)
:
low
focus
gain
VOLT/DIV:
1V
TIME/DIV:
2mS
a—
2V
high
focus
gain
VOLT/DIV:
1V
TIME/DIV:
2mS
OS
EB
RIES
ESO
asf
aatd
ages
Hea
aad
eK
CDP-10'
6.
Connect
oscilloscope
to
servo
amp
board
TP6.
7.
Adjust
RV301
so
that
the
waveform
is
as
shown
in
the
figure
below.
(tracking
gain
adjustment)
VOLT/DIV:
2V
TIME/DIV:
2mS
@
Incorrect
Examples
(fundamental
wave
appears)
low
tracking
gain
high
tracking
gain
(higher fundamental wave than for low gain}
Adjustment
Location:
Servo
amp
board
RV301
{tracking
gain}
TP6
o4u3s a2]s
RV205
(focus
gain}
VOLT/DIV:
2V
TIME/DIV:
2mS
VOLT/DIV:
2V
TIME/DIV:
2mS
, i
t [ t '