Sharp Aquos LC-60LE360X Service Manual Download

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LC-60/70LE360X

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CHAPTER 1.

SAFETY PRECAUTION

[1] IMPORTANT SERVICE PRECAUTION

IMP OR TA NT S E R V IC E S A F E T Y P R E C A UT ION

WA R NING

1. F or continued s afety, no modification of any circuit s hould be

attempted.

2. Dis connect AC power before s ervicing.

B E F OR E R E T UR NING T HE R E C E IV E R (F ire &

S hoc k Hazard)

B efore returning the rec eiver to the us er, perform the following
s afety c hec ks :

3. Ins pect all lead dres s to make certain that leads are not pinched,

and check that hardware is not lodged between the chas s is and
other metal parts in the receiver.

4. Ins pect all protective devices s uch as non-metallic control knobs ,

ins ulation materials , cabinet backs , adjus tment and compartment
covers or s hields , is olation res is tor-capacitor networks , mechanical
ins ulators , etc.

5. To be s ure that no s hock hazard exis ts , check for leakage current in

the following manner.

•

P lug the AC cord directly into a 110-240 volt AC outlet.

•

Us ing two clip leads , connect a 1.5k ohm, 10 watt res is tor paral-
leled by a 0.15 F capacitor in s eries with all expos ed metal cabinet
parts and a known earth ground, s uch as electrical conduit or elec-
trical ground connected to an earth ground.

•

Us e an AC voltmeter having with 5000 ohm per volt, or higher, s en-
s itivity or meas ure the AC voltage drop acros s the res is tor.

•

C onnect the res is tor connection to all expos ed metal parts having a
return to the chas s is (antenna, metal cabinet, s crew heads , knobs
and control s hafts , es cutcheon, etc.) and meas ure the AC voltage
drop acros s the res is tor.

All checks mus t be repeated with the AC cord plug connection
revers ed. (If neces s ary, a nonpolarized adaptor plug mus t be us ed
only for the purpos e of completing thes e checks .)

Any reading of 0.74 Vrms (this corres ponds to 0.5 mA rms AC .) or
more is exces s ive and indicates a potential s hock hazard which
mus t be corrected before returning the monitor to the owner.

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S A F E T Y NOT IC E

Many electrical and mechanical parts in LC D colour televis ion have
s pecial s afety-related characteris tics .

T hes e characteris tics are often not evident from vis ual ins pection, nor
can protection afforded by them be neces s arily increas ed by us ing
replacement components rated for higher voltage, wattage, etc.

R eplacement parts which have thes e s pecial s afety characteris tics are
identified in this manual; electrical components having s uch features

are identified by "

" and s haded areas in the R eplacement P arts Lis t

and S chematic Diagrams .

F or continued protection, replacement parts mus t be identical to thos e
us ed in the original circuit.

T he us e of a s ubs titute replacement parts which do not have the s ame
s afety characteris tics as the factory recommended replacement parts
s hown in this s ervice manual, may create s hock, fire or other hazards .

S ervic e work s hould be performed only by qualified s ervic e tec hnic ians who are thoroughly familiar with all s afety c hec ks and the
s ervic ing guidelines whic h follow:

DV M

AC S C ALE

1.5k ohm

10W

T O E XP OS E D
ME T AL P AR T S

C ONNE C T T O
K NOWN E AR T H
G R OUND

0.15

µF

T E S T P R OB E