LC-37GE1E (serv.man12) - Sharp TV Service Manual (repair manual). Page 2

LC-37GE1E

1 – 1

LC-37GE1E

Service Manual

 

1. For continued safety, no modification of any circuit should be attempted.

2. Disconnect AC power before servicing.

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. (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

μF 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.

• A true RMS reading multimeter should be used for this test, especially where the equipment uses a switch mode power supply which may result in

very non-sinusoidal leakage current.

• 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 pur-
pose of completing these checks.)
Any reading of 1.75 Vrms (this corresponds to 0.7 mA. peak AC.) or more is excessive and indicates a potential shock hazard which must be cor-
rected before returning the monitor to the owner.

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Many electrical and mechanical parts in LCD color 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, watt-
age, etc. Replacement parts which have these special safety characteristics are identified in this manual; electrical components having such features

are identified by " 

" . 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.

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Service work should be performed only by qualified service technicians who are thoroughly familiar with all safety checks and the 
servicing guidelines which follow:

CAUTION: FOR CONTINUED PROTECTION AGAINST A RISK OF

FIRE REPLACE ONLY WITH SAME TYPE

F701 (4A / 250V)

DVM

AC SCALE

1.5k ohm

10W

TO EXPOSED

METAL PARTS

CONNECT TO

KNOWN EARTH

GROUND

0.15

μF

TEST PROBE