Omnivision PVQ-130W Service Manual page 4

1. Plug the AC cord directly into the AC outlet.
Do not use a isolation transformer for this check.
2. Connect a 1.5 kΩ Ω Ω Ω , 10 W resistor, in parallel with a 0.15µ µ µ µ F 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 kΩ Ω Ω Ω /V or more sensitivity, to measure 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 the
receiver 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
Figure 1
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