Sharp 21HM-10F Service Manual - Page 3

Browse online or download pdf Service Manual for TV Sharp 21HM-10F. Sharp 21HM-10F 32 pages. Secam b/g, l/l' - pal b/g system colour television

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21HM-10F

IMPORTANT SERVICING NOTES

Only qualified service personnel are allowed to carry out maintenance and repair of this receiver.

SERVICING OF HIGH VOLTAGE SYSTEM AND CRT

It is important that the static charge is removed from the high voltage system when carrying out work

on the receiver. This can be achieved by connecting a 10K resistor (with a suitably insulated lead) from

the CRT cavity connector to the CRT ground tag. This must be carried out with the AC supply discon-

nected from the receiver.

Note the following:

•

The CRT in this receiver employs Integral Implosion Protection.

•

If the CRT has to be changed it MUST be replaced with the correct type for continued safe

working

•

DO NOT lift the CRT by its neck.

•

When handing the CRT, ensure that shatterproof goggles are worn.

•

Ensure that the CRT is discharge before handling.

This receiver is designed to keep any x-ray emission to an absolute minimum. Some fault conditions

and servicing procedures may produce potentially hazardous x-ray radiation levels. This is a problem

when in close proximity to the receiver for long periods of time. To reduce any risks associated with

this, please observe the following precautions:

1. When undertaking any servicing on this chassis, DO NOT increase the EHT to more than 30.5 KV,

(at a instantaneous beam current of 1300µΑ).

2. Ensure that during normal operation the EHT does not exceed 25.0 KV

1100µΑ). This level has been preset in the factory. Always check that this level has not been ex-

ceeded after carrying out any repair on the receiver.

3. DO NOT replace the CRT with any other type than that specified in the parts listing as this may

cause excessive x-ray radiation.

BEFORE RETURNING THE RECEIVER TO THE CUSTOMER

In addition to the above checks, the following should also be carried out before returning the receiver

to the customer.

1. Inspect all the leads to ensure that they are dressed correctly and that they are not obstructed or

pinched by any other parts.

2. Ensure that all protective devices are in good condition. These will include nonmetallic control

knobs, insulating fish papers, cabinets backs, compartment covers or shields, mechanical insulators,

etc.

X-RAY

1.5KV (at a beam current of