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JVC UX-A5 - CD Player Section Adjustment Procedures; Tracking Offset Adjustment Method

JVC UX-A5
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UX-A5
A/B/E/G/GI/EN
a
Adjustment
of
CD
Player
Sections
CD
unit
The
term
“in
this
State”
refers
to
the
state
in
which
the
CD
mechanism
(EXL-M5B)
and
CD
Control
Board
(VMW2307A)
are
assembled.
Accordingly,
maintenance
and
other
service
operations
are
performd
in
a
“State
of
CD
Unit”.
How
to
Reset
Microcomputer
Adjust
level
at
pin@®of
FW2
to
+5V
first,
and
then
shortcircuit
it
to
GND.
e
Preparation
1.
When
regulated
power
supply
is
used,
shortcircuit
between
pin@and
pin@of
FW501.
Supply
power
of
10
V
to
pin@of
FW501.
Measure
audio
output
at
the
speaker
output
terminal.
2.
When
adjustment
or
measurement
needs
to
load
a
disk,
remove
the
magnet
clamper
from
the
set.
3.
With
the
OPEN/CLOSE
switch
(leaf
switches
$718,
S717)
set
to
ON,
TOC
reading
starts.
Tacking
offset
NIARMARARATL
ALUN
TY
FULL
WAT
Fig.
6-9
TP504
TPS503
cp
Fig.
6-10
20
(No.
1857}
Adjustment
of
tracking
offset
Oscilloscope,
Normal
disk
are
necessary.
wn
Adjustment
procedure
.
Connect
an
oscilloscope
between
TP502
(VREF)
and
TP503
(TE).
Play
a
normal
disk.
Shortcircuit
between
TP504
and
TP502.
Adjust
VR501
so
that
DC
level
of
tracking
error
signal
becomes
zero
(waveform
on
oscilloscope
screen).
Note:
Adjust
VR501
to
shape
waveform
vertically
symmetric
based
on
zero
level.
Input
to
oscillocope
is
supplied
in
DC
coupling
circuit.
|
|
Match
the
center
of
P-P
to
zero
DC
level.
Shortcircuit
between
pin@and
pin@.
Supply
10
V
power
to
pin®.

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