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? Use an AC voltmeter having with 5000 ohm per volt,
or higher, sensitivity or measure the AC voltage drop
1. For continued safety, no modification of any circuit
across the resistor.
should be attempted.
? Connect the resistor connection to all exposed metal
2. Disconnect AC power before servicing.
parts having a return to the chassis (antenna, metal
cabinet, screw heads, knobs and control shafts,
CAUTION: FOR CONTINUED PROTECTIONescutcheon, etc.) and measure the AC voltage drop
AGAINST A RISK OF FIRE REPLACE ONLY WITHacross the resistor.
SAME TYPE FUSE.All checks must be repeated with the AC cord plug
AVC SIDE: F701 (T2A, 250V)connection reversed. (If necessary, a nonpolarized
LCD SIDE: F7501, F7502, F7503, F7504, F7551,adaptor plug must be used only for the purpose of
F7552, F7553, F7611, F7612, F7613, F7614, F7641,completing these checks.)
F7642, F7643 (T1AL, 250V), F2701, F2702 (T2.5AH,Any reading of 35V peak (this corresponds to 0.7
250V)mA. peak AC.) or more is excessive and indicates a
potential shock hazard which must be corrected
before returning the monitor to the owner.
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 theDVM
receiver.AC SCALE
2. Inspect all protective devices such as non-metallic
50k ohm
control knobs, insulation materials, cabinet backs,10W
adjustment and compartment covers or shields,
isolation resistor-capacitor networks, mechanical
insulators, etc.
3. To be sure that no shock hazard exists, check for
0.15 ?F
leakage current in the following manner.
TEST PROBE
? 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 0.15?F capacitor in series
with all exposed metal cabinet parts and a known
TO EXPOSED
earth ground, such as electrical conduit or electricalCONNECT TO
METAL PARTS
KNOWN EARTH
ground connected to an earth ground.
GROUND
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SAFETY NOTICE
Many electrical and mechanical parts in LCD colourand shaded areas in the Replacement Parts List and
television have special safety-related characterSchematic Diaistics.grams.
These characteristics are often not evident from visualFor continued protection, replacement parts must be
inspection, nor can protection afforded by them beidentical to those used in the original circuit.
necessarily increased by using replacement componentsThe use of a substitute replacement parts which do not
rated for higher voltage, wattage, etc.have the same safety characteristics as the factory
Replacement parts which have these special safrecommended replacement paretyts shown in this service
characteristics are identified in this manual;man electrual, maicaly create shock, fire or other hazards.
components having such features are identified ba�y O
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2 |
ACEC
SHARP
