Panasonic TH-103PF10EK, Service Manual

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TH-103PF10UK/EK
1 Safety Precautions
1.1. General Guidelines
1. W hen conducting repairs and servicing, do not attempt to modify the equipment, its parts or its materials.
2. W hen wiring units (with cables, flexible cables or lead wires) are supplied as repair parts and only one wire or some of the
wires have been broken or disconnected, do not attempt to repair or re-wire the units. Replace the entire wiring unit instead.
3. W hen conducting repairs and servicing, do not twist the Faston connectors but plug them straight in or unplug them straight
out.
4. W hen 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.
5. After servicing, see to it that all the protective devices such as insulation barriers, insulation papers shields are properly
installed.
6. After servicing, make the following leakage current checks to prevent the custom er from being exposed to shock hazards.
1.2. Leakage Current Hot Check (See
Figure 1.)
1. Plug the AC cord directly into the AC outlet. Do not use
an isolation transform er for this check.
2. Connect a 1.5kohm, 10 watts resistor, in parallel with a
0.15|iF 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 ohm s/volt or more sensi­
tivity, to measure the potential across the resistor.
4. Check each exposed metallic part, and measure the volt­
age at each point.
5. Reverse the AC plug in the AC outlet and repeat each of
the above measurements.
6. The potential at any point should not exceed 0.75 volts
RMS. A leakage current tester (Simpson Model 229 or
equivalent) may be used to make the hot checks, leakage
current must not exceed 1/2 milliamp. In case a measure­
ment is outside of the limits specified, there is a possibility
of a shock hazard, and the equipm ent should be repaired
and rechecked before it is returned to the customer.
1.1.1. Leakage Current Cold Check
1. Unplug the AC cord and connect a jum per between the
two prongs on the plug.
2. Measure the resistance value, with an ohmmeter,
between the jumpered AC plug and each exposed metal­
lic cabinet part on the equipm ent such as screwheads,
connectors, control shafts, etc. W hen the exposed metal­
lic part has a return path to the chassis, the reading
should be between 1Mohm and 5.2Mohm.
W hen the exposed metal does not have a return path to
the chassis, the reading must beO O .
1.1
Figure 1
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