Panasonic DVD-RV26 Service Manual

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the plug.2. Measure the resistance value, with an ohmmeter, between thejumpered AC plug and each exposed metallic cabinet part on theequipment such as screwheads, connectors, control shafts, etc. Whenthe exposed metallic part has a return path to thechassis, the readingshould be between 1M and 5.2M . / When the exposed metal doesnot have a return path to the chassis, the reading must be .Figure 11.1.2. LEAKAGE CURRENT HOT CHECK (SeeFigure 1.)1. Plug the AC cord directly into the AC outlet. Do not use an isolationtransformer for this check.2. Connect a 1.5k , 10 watts resistor, in parallel with a 0.15 Fcapacitors, between each exposed metallic part on the set and a goodearth ground such as a water pipe, as shown inFigure 1.3. Use an AC voltmeter, with 1000 ohms/volt or more sensitivity, tomeasure the potential across the resistor.4. Check each exposed metallic part, and measure the voltage at eachpoint.5. Reverse the AC plug in the AC outlet and repeat each of the abovemeasurements.6. The potential at any point should not exceed 0.75 volts RMS. Aleakage current tester (Simpson Model 229 or equivalent) may be usedto make the hot checks, leakage current mu3st not exceed 1/2milliamp. In case a measurement is outsideof the limits specified,there is a possibility of a shock hazard, and the equipment should berepaired and rechecked before it is returned to the customer.2. PREVENTION OF ELECTRO STATIC DISCHARGE(ESD) TO ELECTROSTATICALLY SENSITIVE (ES)4