General Guidelines; Leakage Current Cold Check - Panasonic SB-WA880 Service Manual

1.1. 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, check for leakage current to prevent from being
exposed to shock hazards.

1.1.1. LEAKAGE CURRENT COLD CHECK

1. Unplug the AC cord and connect a jumper between the two
prongs on the plug.
2. Using an ohmmeter measure the resistance value, 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
exposed metal does not have a return path to the chassis, the
reading must be
1.1.2. LEAKAGE CURRENT HOT CHECK (See Figure 1.)
1. Plug the AC cord directly into the AC outlet. Do not use an
isolation transformer for this check.
2. Connect a 1.5k
capacitors, between each exposed metallic part on the set and a
good earth ground such as a water pipe, as shown in Figure 1.
3. Use an AC voltmeter, with 1000 ohms/volt or more sensitivity, to
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Fig. 1
, 10 watts resistor, in parallel with a 0.15
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