Sharp 28L-F92EES Service Manual download (Page 4 of 16)

Manual type:Service Manual
Pages:16
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Page 4 of 16
4
28LF-92EES
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 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 30 KV, (at a
instantaneous beam current of 1800 μA
)
.
2. Ensure that during normal operation the EHT does not exceed 28,15 KV (at a beam current of 1800 μA).
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.
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