Sharp AN-37W4K Servicehandleiding - Pagina 2

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LC-37HV4EB, AN-37U4-B

AN-37L4-T, AN37W4K

IMPORTANT SERVICE SAFETY PRECAUTION

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

oughly familiar with all safety checks and the servicing guidelines which follow:

WARNING

1. For continued safety, no modification of any circuit

should be attempted.

2. Disconnect AC power before servicing.

CAUTION: FOR CONTINUED PROTECTION

AGAINST A RISK OF FIRE REPLACE ONLY WITH

SAME TYPE FUSE.

AVC SIDE: F701 (T2A, 250V)

LCD SIDE: F7501, F7502, F7503, F7504, F7551,

F7552, F7553, F7611, F7612, F7613, F7614, F7641,

F7642, F7643 (T1AL, 250V), F2701, F2702 (T2.5AH,

250V)

BEFORE RETURNING THE RECEIVER

(Fire & Shock Hazard)

Before returning the receiver to the user, perform

the following safety checks:

1. Inspect all lead dress to make certain that leads are

not pinched, and check that hardware is not lodged

between the chassis and other metal parts in the

receiver.

2. Inspect all protective devices such as non-metallic

control knobs, insulation materials, cabinet backs,

adjustment and compartment covers or shields,

isolation resistor-capacitor networks, mechanical

insulators, etc.

3. To be sure that no shock hazard exists, check for

leakage current in the following manner.

» Plug the AC cord directly into a 220~240 volt AC outlet.

» Using two clip leads, connect a 50k ohm, 10 watt

resistor paralleled by a 0.15µF 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.

1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1

SAFETY NOTICE

Many electrical and mechanical parts in LCD colour

television have special safety-related 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 " å"

1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1

» Use an AC voltmeter having with 5000 ohm per volt,

or higher, sensitivity or measure the AC voltage drop

across the resistor.

» Connect the resistor connection to all exposed metal

parts having a return 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 cord plug

connection reversed. (If necessary, a nonpolarized

adaptor plug must be used only for the purpose of

completing these checks.)

Any reading of 35V peak (this corresponds to 0.7

mA. peak AC.) or more is excessive and indicates a

potential shock hazard which must be corrected

before returning the monitor to the owner.

TO EXPOSED

METAL PARTS

and shaded areas in the Replacement Parts List and

Schematic Diagrams.

For continued protection, 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.

DVM

AC SCALE

50k ohm

10W

0.15 µF

TEST PROBE

CONNECT TO

KNOWN EARTH

GROUND