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etc. When the exposed metallic part has a return pathto 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 zero.
1.3. Leakage Current Hot Check (See Fig. 1)
1. Plug the AC cord directly into the AC outlet. Do not use an
isolation transformer for this check.
2. Connect a 2 k , 10 W resistor in series with an exposed metallic
part on the receiver and an earth such as a water pipe.
3. Use an AC voltmeter, with high impedance type, to measure the
potential across the resistor.
4. Check each exposed metallic part, and measure the voltage at
each point. Fig. 3.
5. Reverse the AC plug in the AC outlet and repeat each of the above
measurements.
6. The potential any point should not exceed 1.0 V rms. In the case
of a measurement being outside of the limits specified, there is a
possibility of a shock hazard, and the receiver should be repaired
and re-checked before it is returnedto the customer. Fig. 4.
1.4. X-Radiation
Warning :
1. The potential sources of X-Radiation in TV sets are the EHT
Fig. 3
Fig. 4
4
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