Panasonic DVC PRO Studio AJ-D950P Service Manual page 2

2.1. 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, make the following leakage current checks to
prevent the customer from being exposed to shock properly
installed.
3. After servicing, make the following leakage current checks to
prevent the customer from being exposed to shock hazards.
2.2. LEAKAGE CURRENT COLD CHECK
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
exposed metal does not have a return path to the chassis, the
reading must be infinity.
2.3. 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
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
measure the potential across the resistor.
4. Check each exposed metallic part, and measure the voltage at
Figure 1
, 10 W resistor, in parallel with a 0.15
and 5.2M
2
. When the
capacitor,