Toshiba P503DL service manual Safety Precaution

1500 ohm

10 watt

each exposed metallic part.

Good earth ground such as a water pipe, conduit, etc.

Place this probe on

0.15MFD

AC VOLTMETER

SAFETY PRECAUTION

WARNING: Service should not be attempted by anyone unfamiliar with the necessary precautions on this projector. The following are the necessary precautions to be observed before servicing this chassis.

1.An isolation Transformer should be connected in the power line between the projector and the AC line before any service is performed on the projector.

2.When replacing a chassis in the cabinet, always be certain that all the protective devices are put back in place, such as; non-metallic control knobs, insulating covers, shields, isolation resistor-capacitor network etc.

3.Before returning the set to the customer, always perform an AC leakage current check on the exposed metallic parts of the cabinet, such as terminals, screwheads, metal overlays, control shafts etc. to be sure the set is safe to operate without danger of electrical shock. Plug the AC line cord directly into a AC outlet

(do not use a line isolation transformer during this check). Use an AC voltmeter having 5000-ohm per volt or more sensitivity in the following manner: Connect a 1500-ohm 10W resistor, paralleled by a 0.15-MFD, AC type capacitor, between a known good earth ground (water pipe, conduit, etc.) and the exposed metallic parts, one at a time. Measure the AC

voltage across the combination of 1500-ohm resistor

and 0.15-MFD capacitor. Reverse the AC plug at the AC outlet and repeat AC voltage measurements for

each exposed metallic part. Voltage measured must

not exceed 5.25V(rms). This corresponds to 3.5mA(AC). Any value exceeding this limit constitutes

a potential shock hazard and must be corrected immediately.

PRODUCT SAFETY NOTICE

Many electrical and mechanical parts in this chassis have special safety-related characteristics. These characteristics are often passed unnoticed by a visual inspection and the protection afforded by them cannot necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in this manual and its supplements; electrical components having such features are identified by the international hazard symbols on the schematic diagram and the parts list.

Before replacing any of these components, read the parts list in this manual carefully. The use of substitute replacement parts which do not have the same safety characteristics as specified in the parts list may create shock, fire or other hazards.

ULTRAVIOLET DANGER IN SERVICE MODE

Eye damage may result from directly viewing the light produced by the lamp used in this product. Always turn off lamp before opening this cover. Ultraviolet radiation eye protection required during servicing.

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