Sharp 15JF-25S Service Manual - Page 3

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15JF-25S

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 disconnected 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.

X-Ray

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 27.5 KV, (at a

instantaneous beam current of 1000µA

2. Ensure that during normal operation the EHT does not exceed 24.5 KV±1.5KV (at a beam current of

900µA). This level has been preset in the factory. Always check that this level has not been exceeded

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.

IMPORTANT SERVICING NOTES

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