Sony KDL-40CX525 Service Manual page 11

SEÇÃO 1 - SEGURANÇA E CARACTERÍSTICAS
The AC leakage from any exposed metal part to earth ground and from all
exposed metal parts to any exposed metal part having a return to chassis, must
not exceed 0.5 mA(500 microamperes). Leakage current can be measured by
any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA WT-
540A. Follow the manufacturers' instructions to use these instructions.
2. A battery-operated AC milliampmeter. The Data Precision 245 digital
multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a VOM or
battery-operated AC voltmeter. The "limit" indication is 0.75 V, so analog
meters must have an accurate low voltage scale.
4. The Simpson's 250 and Sanwa SH-63TRD are examples of passive
VOMs that are suitable. Nearly all battery-operated digital multimeters
that have a 2 VAC range are suitable (see Figure A).
COMO ENCONTRAR UM BOM ATERRAMENTO
A cold-water pipe is a guaranteed earth ground; the cover-plate retaining screw
on most AC outlet boxes is also at earth ground.
If the retaining screw is to be used as your earth ground, verify that it is at ground
by measuring the resistance between it and a cold-water pipe with an ohmmeter.
The reading should be zero ohms.
If a cold-water pipe is not accessible, connect a 60-to 100-watt trouble-light (not
a neon lamp) between the hot side of the receptacle and the retaining screw. Try
both slots, if necessary, to locate the hot side on the line; the lamp should light at
normal brilliance if the screw is at ground potential (see Figure B).
KDL-32CX525/40CX525/46CX525
TESTE DE FUGA
To Exposed Metal
Parts on Set
0.15 µF
Earth Ground
Figure A. Using an AC voltmeter to check AC leakage.
Trouble Light
Ohmmeter
AC Outlet Box
Figure B. Checking for earth ground.
AC
Voltmete r
(0.75V)
Cold-water Pipe
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