Onkyo DX-C300 Service Manual

DX-C300
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
cable
and
chassis.
Specifications: more than 10Mohm at SO0V.
2. Voltage selector (rear panel)
Worldwide models are equipped with a voltage selector to
conform with local power supplies. Be sure to set this selector
to match the voltage of the power supply in your area before
turning the power switch on. Voltage is changed by turning
the voltage selector with a screwdriver or similar instrument
to the 110V, 120V, 220V or 240V position. Confirm that the
selector has been set to the correct position before turning
the power switch on. If there is no voltage selector switch on
the unit you have purchased, it can only be used in areas
where the power supply voltage is the same as that of the unit.
SEA
atAC 110V at AC 120V atAC 220V— at AC 240V
3. Procedures for replacement of flat packaged ICs
1. Tools to be used:
(1) Soldering iron .... Grounded soldefing iron or
soldering iron with leak re-
sistance of 10 Mohms or
more.
Form of soldering iron’s tip:
(2) Magnifying glass ... for checking of finished
works
(3) Tweezers........ for handling of IC and
forming of leads
(4) Grounding ring... . Countermeasure for electro-
static breakdown
(5) Nipper ......... for removing defective IC
(6) Small brush ...... for application of flux
(7) Enamel line
2. Work Procedures:
(1) Remove the defective IC
Cut all leads of the defective IC one by one using
a nipper and remove the IC.
1.
An
enamel
line
has
been
pierced
between
the
legs
of the flat package IC.
2. Use a soldering iron to unsolder the legs one at
a time.
3.
Repeat
the
procedure
of
I
and
2
above
for
the
3
sides only.
ay
While holding the soldering against the enamel line,
pull in the direction of the arrow.
(2)
Clean
the
pattern
surface
of
the
PC
board.
Get
rid
of
the
remaining
leads
and
solder.
(3)
Check
and
from
the
leads
of
the
new
flat
pack-
aged
IC
to
be
installed.
From
every
lead
on
the
new
IC
using
a
pair
of
tweezers,
so
that
all
of
them
are
aligned
neatly
without
being
risen,
twisted
or
inclined
toward
one
side.
Especially
the
rising
portion
of
every
lead
must
be
formed
with
greatest
care.
Ic Be | IC = : Ic Re
.
(Rising) (Twisting) (inclining)

Onkyo DX-C300 Specifications

General

Brand	Onkyo
Model	DX-C300
Category	CD Player
Language	English