Panasonic TX-32LX500M Service Manual

Also see for TX-26LX500A: Operating instructions Service manual

Panasonic TX-32LX500M Service Manual Manual pdf 4 page image

the reading should be between 1M and 5.2M .When the exposed metal does not have a return path to thechassis, the reading must be .Figure 11.1.2. Leakage Current Hot Check (See Figure 1.)1. Plug the AC cord directly into the AC outlet. Do not use anisolation transformer 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 agood earth ground such as a water pipe, as shown in Figure 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 ateach point.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 beused to make the hot checks, leakage current must not exceed 1/2milliamp. In case a measurement is outside of the limits specified,there is a possibility of a shock hazard, and the equipment shouldbe repaired and rechecked before it is returned to the customer.2. Prevention of Electro Static Discharge (ESD) toElectrostatically Sensitive (ES) DevicesSome semiconductor (solid state) devices can be damaged easily by static electricity. Suchcomponents commonly are called Electrostatically Sensitive (ES) Devices. Examples of typicalES devices are integrated circuits and some field-effect transistors and semiconductor "chip"components. The following techniques should be used to help reduce the incidence ofcomponent damage caused by electro static discharge (ESD).4