JVC PC-X95B User Manual

@
Tracking
Offset
Adjustment
*
Required
things:
Oscilloscope
Normal
disc
(CTS1000)
+
Adjustment
procedure:
(1)
Connect
TP503
(Hot
side)
to
an
oscilloscope
while
connect
TP501
(Earth
side)
to
GND.
(2)
Play
back
a‘normal
disc
to
check
if
tracking
error
signal
is
output
or
nor.
(3)
Shortcircuit
between
TP504
and
TP501.
(4)
Adjust
VR501
so
that
DC
level
of
tracking
error
signal
is
on
the
*0"
(zero)
level.
Note:
Adjust
VR501
so
that
the
waveform
becomes
vertically
symmetrical.
Oscilloscope
input
should
be
DC
coupling.
Tracking offset waveform
Fig. 3-3
@
Maintenance
of
CD
pickup
¢
To
confirm
the
service
life
of
laser
diode
(1)
Load
the
set
with
a
disc
and
turn
on
the
power
switch.
(2)
Press
the
PLAY
button
to
play
back
the
disc.
(3)
Observe
RF
output
with
an
oscilloscope.
If it
is
0.6
Vp-p
or
less,
clean
the
object
lens
with
a
cotton
swab.
Again
measure
RF
output.
If
it
is
still
under
0.6
V-p,
the
laser
diode
maybe
gets
having
had
it.
In
that
event,
replace
the
pickup
following
the
instructions.
+
Semi-fixed
resistor
on
the
pickup
board
The
semi-fixed
resistor
on
the
pickup
board
installed
on
the
pickup
are
prepared
for
laser
power
adjustment.
Since
this
adjustment
must
be
performed
in
accordance
with
the
properties
of
the
optical
block,
do
not
disturb
this
semi-
fixed
resistor.
:
When
laser
power
is
poor,
it
results
from
wear
of
the
laser
diode
and
it
needs
to
replace.
if
the
semi-fixed
resistor
of
the
normal
pickup
is
turned,
it
may
be
damaged
by
overcurrent.
;
* Grating adjustment:
Grating
has
been
adjusted
well
in
the
unit
condition.
If
it
is
maladjusted,
playback
of
CD
may
become
impossible
since
,
laser
beam
traces
another
track.
*
APC
(automatic
program
control)
In
the
OPTIMAS,
APC
is
prepared
in
the
CD
mechanism,
however,
in
the
OPTIMAG,
an
IC
on
the
CD
board.
functions
as
APC.
(CD
mechanism
has
no
APC
function.)
_| Preset VR501 for tracking adjustment to the center
position.
| PC-X95 pecan
To set center of P-P
to DC zero level.
+ Pickup replacement procedure
Separate
the
pickup
from
the
set
to
be
a
unit,
and
|—
confirm
no
incoming
electricity.
J
Detach the CD mechanism from the CD board.
Loosen
screws
fixing
the
pickup
to
the
pickup
holder
and
shaft
and
remove
the
pickup.
L
Install a new pickup and securely connect it to the
connector, then reassemble the CD mechanism to the
CD board.
L
Unsolder solder bridge of the shorting land for laser
protection on the soldered side of the pickup board.
Turn on the electricity without disc being loaded, and
confirm that the lens vertically moves with emission
_ of the laser. (Do not look laser bean in the eye.)
Play back a disc to confirm that the disc normally
rotates.
Adjust tracking offset
=a
PLAY, SKIP operation normal ?
See Repair
LYES instructions.
Replacement completes.
(No. 1859) 21

JVC PC-X95B Specifications

General

Brand	JVC
Model	PC-X95B
Category	CD Player
Language	English