Panasonic SA-HT535EE Service Manual

Subwoofer Unit)Disconnect AC power, discharge Power Supply Capacitors C2080 through a 10 , 10 W resistorto ground.DO NOT SHORT-CIRCUIT DIRECTLY (with a screwdriver blade, for instance), as this maydestroy solid state devices.After repairs are completed, restore power gradually using a variac, to avoid overcurrent.Current consumption at AC 230V, 50Hz in NO SIGNAL mode should be ~850 mA (ActiveSubwoofer).3. SAFETY PRECAUTIONS3.1. GENERAL GUIDELINES1. When servicing, observe the original lead dress. If a short circuitis found, replace all parts which have been overheated ordamaged by the short circuit.2. After servicing, ensure 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.3.1.1. LEAKAGE CURRENT COLD CHECK (FOR ACTIVE SUBWOOFER)1. 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 the chassis,the reading should be between 1M and 5.2 . / When theexposed metal does not have a return path to the chassis, thereading must be .Fig. 13.1.2. LEAKAGE CURRENT HOT CHECK (See Figure 1.)6PDF created with pdfFactory Pro trial version www.pdffactory.com