RQT8017-R datasheet(5/71 Pages) PANASONIC

5 / 71 page

1.1.1.

Leakage current cold check

1. Unplug the AC cord and connect a jumper between the two

prongs on the plug.

2. Measure the resistance value, with an ohmmeter, between

the jumpered AC plug and each exposed metallic cabinet

part on the equipment such as screwheads, connectors,

control shafts, etc. When the exposed metallic part has a

return path to the chassis, the reading should be between

Ω and 5.2MΩ.

When the exposed metal does not have a return path to

the chassis, the reading must be

Figure 1

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

Ω, 10 watts resistor, in parallel with a 0.15µF

capacitors, between each 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 measuremen ts.

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

measuremen t 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.

1 Safety precautions

1.1.

General guidelines

1. When servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated or

damaged by the short circuit.

2. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly

installed.

3. After servicing, make the following leakage current checks to prevent the customer from being exposed to shock hazards.

DMR-ES10EB / DMR-ES10EC / DMR-ES10EG / DMR-ES10EP / DMR-ES10EBL

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