Sharp 4M-IOM Instrukcja serwisowa - Strona 2

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IMPORTANT SERVICE SAFETY PRECAUTION

Service work should be performed only by qualified service technicians who are

thoroughly familiar with all safety checks and servicing guidelines which follow:

WARNING

circuit should be attempted.

BEFORE RETURNING THE RECEIVER

(Fire &Shock Hazard)

Before returning the receiver to the user,

perform the following safety checks:

are not pinched, and check that hardware is

not lodged between the chassis and other

metal parts in the receiver.

metallic control knobs, insulating materials,

cabinet backs, adjustment and compartment

covers or shields, isolation resistor-capacity

networks, mechanical insulators, etc.

for current leakage in the following manner.

Plug the AC Adaptor directly into a 110-240

volt AC outlet, (Do not use an isolation

transformer for this test).

Using two clip leads, connect a 1.5k ohm, 10

watt resistor paralleled by a 0.15~.1F capacitor in

series with all exposed metal cabinet parts and

a known earth ground, such as electrical

conduit or electrical ground connected to an

earth ground.

Use an AC voltmeter having with 5000 ohm per

volt, or higher, sensitivity to measure the AC

voltage drop across the resistor.

Connect the resistor connection to all exposed

metal parts having a return path to the chassis

(antenna, metal cabinet, screw heads, knobs

and control shafts, escutcheon, etc.) and

measure the AC voltage drop across the

resistor.

All checks must be repeated with the AC

Adaptor plug connection reversed.

necessary, a nonpolarized adapter plug must

be used only for the purpose of completing

these checks.)

Any reading of 0.3 volt RMS (this corresponds

to 0.2 milliamp. AC.) or more is excessive and

indicates a potential shock hazard which must

be corrected before returning the receiver to

the owner.

TO EXPOSED'

METAL PARTS

SAFETY NOTICE

Many electrical and mechanical parts in television

receivers

h a v e s p e c i a l

characteristics.

'These characteristics are often not evident from

visual inspection, nor can protection afforded by

them be necessarily increased by using

replacement components rated for higher

voltage, wattage, etc.

Replacement parts which have these special

safety characteristics are identified in this

manual;

electrical components having such

features are identified by H A" and shaded areas

in the Replacement Parts Lists and Schematic

D i a g r a m s .

F o r c o n t i n u e d p r o t e c t i o n ,

replacement parts must be identical to those used

in the original circuit. The use of a substitute

replacement parts which do not have the same

safety characteristics as the factory recommended

replacement parts shown in this service manual,

may create shock, fire, or other hazards.

CONNECT TO

KNOWN EARTH

GROUND

s a f e t y - r e l a t e d