Panasonic DMR-ES15EB Service Manual page 3

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1.1.2. Leakage current hot check
(See Figure 1 .)
1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this
check.
2. Connect a 1.5k
exposed metallic part on the set and a good earth ground such as a water pipe, as shown
in Figure 1.
3. Use an AC voltmeter, with 1000 ohms/volt 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 volts RMS. A leakage current tester
(Simpson Model 229 or equivalent) may be used to make the hot checks, leakage current
must not exceed 1/2 milliampere. In case a measurement is outside of the limits specified,
there is a possibility of a shock hazard, and the equipment should be repaired and
rechecked before it is returned to the customer.
2. Warning
2.1. Prevention of Electrostatic Discharge (ESD) to Electrostatic
Sensitive (ES) Devices
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such
components commonly are called Electrostatic Sensitive (ES) Devices. Examples of typical
ES devices are integrated circuits and some field-effect transistor-sand semiconductor
"chip" components. The following techniques should be used to help reduce the incidence
of component damage caused by electrostatic discharge (ESD).
, 10 watts resistor, in parallel with a 0.15
Figure 1
3
F capacitors, between each