Panasonic SA-HT535E, Service Manual

Page: 5 / 103

1.2. Checking Main Unit Using Power Jig
If the active subwoofer is not available during time of repair to the unit, the following equipment could be used.
Jig product number
RFKZ0182 (110V , 127V, 220V, 230V - 240V for with voltage selector overseas domestic use).
2 Before Repair and Adjustment (Using Active Subwoofer
Unit)
Disconnect AC power, discharge Power Supply Capacitors C2080 through a 10 Ω , 10 W resistor to ground.
DO NOT SHORT-CIRCUIT DIRECTLY (with a screwdriver blade, for instance), as this may destroy 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 (Active Subwoofer).
3 SAFETY PRECAUTIONS
3.1. GENERAL GUIDELINES
1. When servicing, observe the original lead dress. If a short circuit is found, replace all parts which have been overheated or
damaged by the short circuit.
2. After servicing, ensure that all the protective devices such as insulation barriers, insulation papers shields are properly installed.
3. After servicing, make the following leakage current checks to prevent 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 two prongs on the plug.
2. Measure the resistance value, with an ohmmeter, between the jumpered AC plug and each exposed metallic cabinet part on
the equipment 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
Ω
and 5.2
Ω
.
When the exposed metal does not have a return path to the chassis, the reading must be .
5
SA-HT535E / SA-HT535EG