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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:
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.
Ic
Be
|
IC
=
:
Ic
Re
.
(Rising)
(Twisting)
(inclining)
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