Important Service Safety Notes - Sharp XV-Z1U Service Manual

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IMPORTANT SERVICE SAFETY NOTES
n 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 1.5k ohm, 10 watt
resistor paralleled by a 0.15uF 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.
TEST PROBE
TO EXPOSED
METAL PARTS
CONNECT TO KNOWN
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 "A"
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.
De nombreuses pieces, electriques et mecaniques, dans
AVIS POUR LA SECURITE
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 etre 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 etre identiques a celles utilisees dans le circuit
d'origine. Cutilisation 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.