When replacing, the following precautions will help to prevent recurring malfunctio
ns.
1. Cover the plastic parts with aluminum foil.
2. Ground the soldering irons.
3. Use a conductive mat on the work-table.
4. Do not grasp IC or LSI pins with bare fingers.
3. CAUTION
3.1. SAFETY PRECAUTIONS
1. Before servicing, unplug the power cord to prevent an electrical shock.
2. When replacing parts, use only manufacturer’s recommended
components for safety.
3. Check the condition of power cord. Replace if wear or damage is
evident.
4. After servicing, be sure to restore the lead dress, insulation barriers,
insulation papers, shields, etc.
5. Before returning the serviced equipment to the customer, make the
following insulation resistance test to prevent a shock hazard.
3.2. INSULATION RESISTANCE TEST
1. Unplug the AC power cord and short the two prongs of the plug with a
jumper wire.
2. Measure the resistance value with ohmmeter between the jumpered AC
plug and each exposed metal cabinet part, such as screw threads, etc.
Note:
Some exposed parts may be isolated from the chassis by design. These will read infinity.
3. If the measurement is outside the specified limits, there is a possibility
of shock hazard. The equipment should be repaired and rechecked
before it is returned to the customer.
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