ENGLISH
SAFETY PRECAUTIONS
WARNING: The following precautions must be observed.
ALL PRODUCTS CE MARK
Before any service is performed on the chassis an 1. HITACHI products may contain the CE mark on
isolation transformer should be inserted between the the rating plate indicating that the product
power line and the product.
contains parts that have been specifically
1. When replacing the chassis in the cabinet, ensure approved to provide electromagnetic
all the protective devices are put back in place. compatibility to designated levels.
2. When service is required, observe the original 2. When replacing any part in this product, please
lead dressing. Extra precaution should be taken to use only the correct part itemised in the parts list
ensure correct lead dressing in any high voltage to ensure this standard is maintained, and take
circuitry area. care to replace lead dressing to its original state,
3. Many electrical and mechanical parts in as this can have a bearing on the electromagnetic
radiation/immunity.
HITACHI products have special safety related
characteristics. These characteristics are often not
evident from visual inspection, nor can the PICTURE TUBE
protection afforded by them necessarily be
obtained by using replacement components rated 1. The line output stage can develop voltages in
for higher voltage, wattage, etc. Replacement excess of 25kV; if the E.H.T. cap is required to be
parts which have these special safety removed, discharge the anode to chassis via a
high value resistor, prior to its removal from the
characteristics are identified by marking with a picture tube.
on the schematics and the replacement parts
list. 2. High voltage should always be kept at the rated
The use of a substitute replacement component value of the chassis and no higher. Operating at
that does not have the same safety characteristics higher voltages may cause a failure of the picture
as the HITACHI recommended replacement one, tube or high voltage supply, and also, under
shown in the parts list, may create electrical certain circumstances could produce X-radiation
shock, fire, X-radiation, or other hazards. levels moderately in excess of design levels. The
4. Always replace original spacers and maintain lead high voltage must not, under any circumstances,
exceed 29kV on the chassis (except for projection
lengths. Furthermore, where a short circuit has Televisions).
occurred, replace those components that indicate
evidence of overheating. 3. The primary source of X-radiation in the product
5. Insulation resistance should not be less than 2M is the picture tube. The picture tube utilised for
the above mentioned function in this chassis is
ohms at 500V DC between the main poles and specially constructed to limit X-radiation. For
any accessible metal parts. continued X-radiation protection, replace tube
6. No flashover or breakdown should occur during with the same type as the original HITACHI
the dielectric strength test, applying 3kV AC or approved type
4.25kV DC for two seconds between the main 4. Keep the picture tube away from the body while
poles and accessible metal parts. handling. Do not install, remove, or handle the
7. Before returning a serviced product to the picture tube in any manner unless shatterproof
customer, the service technician must thoroughly goggles are worn. People not so equipped should
test the unit to be certain that it is completely safe be kept away while picture tubes are handled
to operate without danger of electrical shock. The
service technician must make sure that no LASERS
protective device built into the instrument by the
manufacturer has become defective, or If the product contains a laser avoid direct exposure to
inadvertently damaged during servicing. the beam when the cover is open or when interlocks are
defeated or have failed. |
ACEC
