Panasonic DMR-E85HEP Service Manual

Panasonic DMR-E85HEP Service Manual Manual pdf 3 page image

2. After servicing, see to it that all the protective devices such asinsulation barriers, insulation papers shields are properlyinstalled.3. After servicing, make the following leakage current checks toprevent the customer from being exposed to shock hazards.1.1.1. Leakage current cold check1. Unplug the AC cord and connect a jumper between the twoprongs on 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.When the exposed metallic part has a return path to thechassis,the reading should be between 1M and 5.2M . / When theexposed metal does not have a return path to the chassis, thereading 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.3