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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 CHECK
1. Connect AC Plug to 120 volt or 240 volt AC outlet.
Do not use the ground prong of AC Plug. (See Fig. 1-2-1)
Do not use a isolation transformer for this check.
2. Connect a 1.5K ohms, 10 watts resistor, in parallel with a 0.15
capacitor, between each exposed metallic part on the set and a
good earth ground. (See Fig. 1-2-2)
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Fig. 1-2-1
Fig. 1-2-2
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