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capacitor, between each exposed metallic part on the set and a
good earth ground , as shown in Figure 1.
3. Use an AC voltmeter, with 1 k
the potential across the resistor.
4. Check each exposed metallic part, and measure the voltage at
each point.
5. Reverse the AC plug in the AC outlet and repeat each of the above
measurements.
6. The potential at any point should not exceed 0.75 V RMS.
A leakage current tester (Simpson Model 229 equivalent) may be
used to make the hot checks. Leakage current must not exceed 1/
2 mA. In case a measurement is outside of the limits specified,
there is a possibility of shock hazard, and thereceiver should be
repaired and rechecked before it is returned to the customer.
2. X-RADIATION
WARNING :
1. The potential source of X-Radiation in TV sets is the High Voltage
section and the picture tube.
2. When using a picture tube test fixture for service, ensure that the
fixture is capable of handling 25.0 kV (For model with 13 inch
CRT) or 30.0 kV (For model with 20 inch CRT) without causing X-
Radiation.
NOTE :
It is important to use an accurate periodically calibrated high
voltage meter.
1. Reduce the brightness to minimum.
/V or more sensitivity, to measure
Figure 1
5
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