Samsung SW-248B, Service Manual

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2
Electricity sensing device
Safety instructions
Some semiconductor units may be damaged easily by
electricity.
These elements are called as electricity sensing
device(ESD) in general. For example, integrated circuit,
field effect transister, semiconductor chip.
The following methods have to be used to reduce the
accident of element damage generated by electricity.
1) Emit all electric charges in your body through contact
with earthing materail at once before handling a
semiconductor factor or device including it.
In other way, make use of commercial wristlet against
electricity
It shall be detached before power impression to the
unit on testing because of shock.
2) After detaching an electrical device including ESD, it
shall be placed on conductive surface such as
aluminium to prevent the charge acummulation and
unit exposure.
3) Utilize only the soldering iron with earthed end for
ESD soldering or release
4) Make use of only anti-static soldering release unit.
A soldering release unit not to be classified as
antistatic may generate the enough charge to damage
ESD unit.
5) Never use a Freon-propelling chemical product.
It may generate the enough charge to damage ESD.
6) Untill installing ESD unit for replacement, never it from
protection package.
(Most of ESD unit for replacement have lead
composed of package shorted electrically by
conductive foam, aluminium or similar conductive
material.)
7) Contact with shassis including ESD or protection
material in circuit parts just before detaching the
protection material from lead of ESD unit for replacement
8) Minimize the body action at handling an unpacked
ESD unit for replacement.
(Otherwise, an unconscious action, so to speak,
friction between clothes or foot lifting from carpet floor
may generate the enough charge to damage ESD
unit.)
Note : Be sure to avoid the power impression to the
shassis or circuit and observe the safety instruction.
1) Read all safety and operational manuals before
operating this product
2) Keep the safety and operational manuals for future
reference.
3) Observe all precations and operational instructions in
or on the surface of this product.
4) Follow all operation and maintenance cautions.
5) Be sure to plug off the power cable before cleaning.
Use a dry cloth to clean a dusty cover of cabinet
instead of liquid or aersol cleaner.
6) Never use a attachment not to be recommended by
this company. It may result in danger and damage.
7) Never use this product around water such as
bathtub, washbasin, laundry machine, swimming pool
or lakeside.
8) Never place this product on bed, sofa or around
radiator and heater.
9) Power : Utilize the only power displayed on lebel
If the power type can't be checked, call to dealer or
Korea Electricity, Co, Ltd. Refer tooperate this product
by battery or other power.
10) Lightning : Plug off the power cable for product
protection during thunder and lightning flashes or this
product is unused for a long time.
11) Overload : Be careful that the wall outlet and
expanded cord is overloaded due to danger of fire
and electrical shock.
12) Never insert a substance or liquid into this product.
It may cause fire or shorck by contact with voltage
point or short.
13) Part replacement : The service engineer has to use
the parts of same specification at replacement.
Otherwire, fire, shock or other dangers may be
occurred.
14) Safety check : Be sure to perform the safety check
at service or repair completion
Importance : This product includes special impotrant
parts on safety.
These parts are indicated by on schematic
diagram.
At replacement of these parts, use the
parts of same specification due to shock,
fire or other dangers.
Never transform the original design without
permission of this company.