Safety Precautions - Hitachi 32PD3000 Service Manual

SAFETY PRECAUTIONS

WARNING: The following precautions must be observed.
ALL PRODUCTS
1. Before any service is performed on the chassis an isolation transformer should be inserted
between the power line and the product.
2. When replacing the chassis in the cabinet, ensure all the protective devices are put back in
place.
3. When service is required, observe the original lead dressing. Extra precaution should be taken
to ensure correct lead dressing in any high voltage circuitry area.
4. Many electrical and mechanical parts in HITACHI products have special safety related
characteristics. These characteristics are often not evident from visual inspection, nor can the
protection afforded by them necessarily be obtained by using replacement components rated
for higher voltage, wattage, etc. Replacement parts which have these special safety
characteristics are identified by marking with a
parts list.
The use of a substitute replacement component that does not have the same safety
characteristics as the HITACHI recommended replacement one, shown in the parts list, may
create electrical shock, fire, X-radiation, or other hazards.
5.
Always replace original spacers and maintain lead lengths. Furthermore, where a short circuit
has occurred, replace those components that indicate evidence of overheating.
6. Insulation resistance should not be less than 2M
any accessible metal parts.
7. No flashover or breakdown should occur during the dielectric strength test, applying 3KV AC or
4.25KV DC for two seconds between the main poles and accessible metal parts.
8. Before returning a serviced product to the customer, the service technician must thoroughly
test the unit to be certain that it is completely safe to operate without danger of electrical shock.
The service technician must make sure that no protective device built into the instrument by the
manufacturer has become defective, or inadvertently damaged during servicing.
CE MARK
1. HITACHI products may contain the CE mark on the rating plate indicating that the product
contains parts that have been specifically approved to provide electromagnetic compatibility to
designated levels.
2. When replacing any part in this product, please use only the correct part itemised in the parts
list to ensure this standard is maintained, and take care to replace lead dressing to its original
state, as this can have a bearing on the electromagnetic radiation/immunity.
LASERS
If the product contains a laser avoid direct exposure to the beam when the cover is open or when
interlocks are defeated or have failed.
on the schematics and the replacement
Ω
at 500V DC between the main poles and
i