Panasonic PT-40LC12 Service Manual page 3

jumpered AC plug and each exposed metallic cabinet part on the
receiver, such as screwheads, connectors, etc. When the exposed
metallic part has a return path to the chassis, the reading should be
between 1 M
return path to the chassis, the reading must be infinity.
1.3. LEAKAGE CURRENT HOT CHECK
1. Plug the AC cord directly into the AC outlet.
Do not use a isolation transformer for this check.
2. Connect a 1.5 k
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
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.
1.4. UV-PRECAUTION
1. Be sure to disconnect the AC Plug when replacing the lamp.
2. Since the lamp reaches a very high temperature during its operation,
and 12 M . When the exposed metal does not have a
, 10 W resistor, in parallel with a 0.15
/V or more sensitivity, to measure the
Figure 1
3
F capacitor,