Sharp XV-ZW99U Service Manual page 3

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xv-zw99u
IMPORTANT SERVICE SAFETY NOTES
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Service work should be performed only by qualified service technicians who are
thoroughly familiar with all safety checks and servicing guidelines as follows:
WARNING
1. For continued safety, no modification of any circuit
should be attempted.
2. Disconnect AC power before servicing.
BEFORE RETURNING THE PROJECTOR:
(Fire & Shock Hazard)
Before returning the projector to the user, perform
the following safety checks:
1.
2.
3.
.
.
Inspect lead wires are not pinched between the
chassis and other metal parts of the projector.
Inspect all protective devices such as non-metallic
control knobs, insulating materials, cabinet backs,
adjustment and compartment covers or shields,
isolation resistor-capacity networks, mechanical
insulators, etc.
To be sure that no shock hazard exists, check for
current leakage in the following manner:
Plug the AC cord directly into a 120~volt AC outlet,
(Do not use an isolation transformer for this test).
Using two clip leads, connect a 1 Sk ohm, 10 watt
resistor paralleled by a 0.15yF capacitor in parallel
between all exposed metal cabinet parts and earth
ground.
Use an AC voltmeter with sensitivity of 5000 ohm
per volt., or higher, sensitivity to measure the AC
voltage drop across the resistor (See Diagram).
All checks must be repeated with the AC plug
connection reversed. (If necessary, a non-polarized
adapter plug must be used only for the purpose of
completing these checks.)
Any reading of 0.3 volts RMS (this corresponds to
0.2 milliamp. AC.) or more is excessive and indicates
a potential shock hazard which must be corrected
before returning the unit to the owner.
0 KNOWN
METAL PARTS EARTH GROUND
SAFETY NOTICE
Many electrical and mechanical parts in LCD Projector
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 "8"
and shaded areas in the Replacement Parts Lists 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.
AVIS POUR LA SECURITE
De nombreuses pieces, electriques et mecaniques,
dans les projecteur a LCD presentent des
caracteristiques speciales relatives a la securite, qui
ne sont souvent pas evidentes a vue.
Le degre de protection ne peut pas Qtre necessairement
augmentee en utilisant des pieces de remplacement
etalonnees pour haute tension, puissance, etc.
Les pieces de remplacement qui presentent ces
caracteristiques sont identifiees dans ce manuel;
les pieces electriques qui presentent ces particularites
sont identifiees par la marque "A" et hachurees dans
la liste des pieces de remplacement et les diagrammes
schematiques. Pour assurer la protection, ces pieces
doivent Qtre identiques a celles utilisees dans le circuit
d'origine. L'utilisation de pieces qui n'ont pas les memes
caracteristiques que les pieces recommandees par
I'usine, indiquees dans ce manuel, peut provoquer des
electrocutions, incendies ou autres accidents.
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