Matsushita Electric TC-21FX20M-MALAYSIA, Service Manual, Page: 3 / 41

metallic cabinet part on the receiver, such as screw heads, aerials,
connectors, control shafts, etc. When the exposed metallic part has a
return path to the chassis, the reading should be between 4 M and 20
M . When the exposed metal does not have a return path to the
chassis, the reading must be infinite.
1.3. Leakage Current Hot Check (Fig. 1)
1. Plug the AC cord directly into the AC outlet. Do not use an isolation
transformer for this check.
2. Check a 2 k non-inductive resistor and an AC/DC current meter, in
series with each exposed metallic part on the receiver in turn and an
earth such as a water pipe.
The current from any point should not exceed 0.7 mA peak AC or 2 mA
DC. In the case of a measurement being outside of these limits
specified, there is a possibility of a shock hazard and the receiver
should be repaired and rechecked before it is returned to the customer.
Fig. 1
1.4. X-Radiation
Warning:
The potential sources of X-Radiation in TV set are the EHT section and the picture tube. When using a
picture tube test jig for service, ensure that jig is capable of handling 29.0kV without causing X-
Radiation.
Note: It is important to use an accurate periodically calibrated high voltage meter.
1. Set the brightness to minimum.
2. Use the remocon to get into Service Mode.
3. Measure the EHT. The meter reading should indicate 27.5±1.5kV. If the
meter indication is out of tolerance, immediate service and correction
3