TABLE
OF
CONTENTS
Specifications
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Service
procedures
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Caution
on
replacement
of
Sptical
ouckip
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Protection
of
eyes
from
laser
beam
during
servicing
..............
3
Laser:
warning
Labels:
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Chassis
exploded
View
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Chassis
exploded
view
parts
list
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Drive
unit
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Parts
List
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IC
block
diagrams
and
descriptions
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Block
diagram
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Microprocesser
terminal
description
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Adjustment
procedures
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©
Printed
circuit
board
view
from
bottom
side
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SGhernatic
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7
Printed
circuit
board
parts
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Packing
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SERVICE
PROCEDURES
1.
Safety-check
out
After
correcting
the
original
service
problem,perform
the
following
safety
check
before
releasing
the
set
to
the
customer:
|
Connect
the
insulating-resistance
tester
between
the
plug
of
power
supply
cord
and
chassis.
Specifications:More
than
10Mohm
at
SO0V.
2.
Voltage
Selector
(Back
panel)
Worldwide
models
are
equipped
with
a
voltage
selector
to
conform
with
local
power
supplies.Be
sure
to
set
this
switch
to
match
the
voltage
of
the
power
supply
7
in
user's
area
before
turning
the
power
switch
on.
_
Voltage
is
changed
by
sliding
the
groove
in
the
switch
with
a
screw
driver
to
the
right
or
left.
.
Confirm
that
the
switch
has
been
moved
all
the
way
to
the
right
or
left
before
turning
the
power
switch
on.
2200V~
120V~
at
AC220V
—220V
~
at
AC120V
120V
~
CAUTION
ON
REPLACEMENT
OF
OPTICAL
PICUP
The
laser
diode
in
the
optical
pickup
block
is
so
sensitive
to
static
électricity,surge
current
and
etc,
that
the
components
are
liable
to
be
broken
down
or
its
reliability
remarkably
deteriorated.
PRECAUTIONS
1.Ground
for
the
work-desk.
Place
a
conductive
sheet
such
as
a
sheet
of
copper
(with
inpedance
lower
than
1OM1)
on
the
work-
desk
and
place
the
set
on
the
conductive
sheet
so
|
that
the
chassis.
2.Grounding
for
the
test
equipment
and
tools.
Test
equipments
and
toolings
should
be
grounded
in
order
that
their
ground
level
is
the
same
the
ground
of
the
power
source.
During
repair,carefulley
take
the
following
precautions.
(The
following
precautions
are
included
in
the
service
parts.)
3.Grounding
for
the
human
body.
Be
sure
to
put
on
a
wrist-strap
for
grounding
whose
|
other
end
is
grounded.
Be
particularly
careful
when
the
workers
wear
synthetic
fiber
clothes,
or
air
is
dry.
4
Select
a
soldering
iron
that
permits
no
leakage
and
have
the
tip
of
the
iron
well-grounded.
5.Do
not
check
the
laser
diode
terminals
with
the
probe
of
a
circuit
tester
or
oscilloscope.
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