TC-21P50R - Panasonic TV Service Manual (repair manual). Page 4

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 1. The  potential sources of X-Radiation in TV sets are the

High Voltage section and the picture tube.

 2. When using a picture tube test jig for service, ensure

that jig is capable of handling 29.2kV without causing X-
Radiation.

It is important to use an accurate periodically cali-
brated high voltage meter.

 1. Set the brightness to minimum.

 2. Measure the High Voltage.  The meter reading should

indicate 28.5 ( +0.7, -1.5) kV.  If the meter indication is
out of tolerance, immediate service and correction is
required to prevent the possibility of premature compo-
nent failure.

 3. To prevent an X-Radiation possibility, it is essential to

use the specified picture tube.