Panasonic TX-32LX80Y Service Manual

Panasonic TX-32LX80Y Service Manual Manual pdf 4 page image

1 Safety Precautions1.1. General Guidelines1. When servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated ordamaged by the short circuit.2. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properlyinstalled.3. After servicing, make the following leakage current checks to prevent the customer from being exposed to shock hazards.1.2. Touch-Current Check1. Plug the AC cord directly into the AC outlet. Do not use an isolation transformer for this check.2. Connect a measuring network for touch currents between each exposed metallic part on the set and a good earth ground suchas a water pipe as shown in Figure 1.3. Use the Leakage Current Tester (Simpson 228 or equivalent) to measure the potential across the measuring network.4. Check each exposed metallic part and measure the voltage at each point.5. The potential at any point (touch current) expressed as voltage U 1 and U2 , do not exceed the following values:For AC: U 1 = 35 V (peak) and U 2 = 0.35 V (peak);For DC: U1 = 1.0 V,NOTE :The limit value of U 2 = 0.35 V (peak) for AC and U 1 = 1.0 V for DC correspond to the values 0.7 mA (peak) AC and 2.0 mA DC.The limit value U 1 = 35 V (peak) for AC correspond to the value 70 mA (peak) AC for frequencies greater than 100 kHz.6. Should a measurement be out of 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.4TX-32LX80Y