Panasonic PT-40LC12 Service Manual page 2

1. SAFETY PRECAUSIONS
1.1. GENERAL GUIDELINES
1. For continued safety, no modification of any circuit should be
attempted.
2. Disconnect AC Plug before disassembling this unit.
3. It is advisable to use an isolation transformer in the AC supply before
servicing.
4. 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.
5. After servicing, see to it that all the protective devices such as
insulation barriers, insulation papers, shield, and isolation R-C
combinations etc. are properly installed.
6. After servicing, be sure to restore the wires, leads, insulation barriers,
shields, etc.
7. After servicing, make the leakage current checks to prevent the
customer from being exposed to shock hazards.
Caution:
Use a separate Isolation Transformer for this unit when servicing.
1.2. LEAKAGE CURRENT COLD CHECK
1. Unplug the AC cord and connect a jumper between the two prongs on
the plug.
2. For physically operated power switches, turn power on. Otherwise
skip step 2.
3. Measure the resistance value, with an ohmmeter, between the
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