MAINTENANCE
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PREVENTIVE MAINTENANCE
1.Perform the following preventive mainte- nance procedures at least once every six months. It is good practice to keep a pre- ventive maintenance record; a record tag attached to the machine works best.
2.Remove the machine wraparound cover and perform the input filter capacitor dis- charge procedure (detailed at the begin- ning of this chapter).
3.Clean the inside of the machine with a low pressure airstream. Be sure to clean the following components thoroughly.
•Power Switch, Driver, Protection, and Control printed circuit boards
•Power Switch
•Main Transformer
•Input Rectifier
•Heat Sink Fins
•Input Filter Capacitors
•Output Terminals
•Lower base compartment
4.Examine capacitors for leakage or oozing. Replace if needed.
5.Examine wraparound cover for dents or breakage. Repair as needed. Cover must be kept in good condition to assure high voltage parts are protected and correct spacings are maintained.
6.Check electrical ground continuity. Using an ohmmeter, measure resistance between either output stud and an unpaint- ed surface of the machine case. Meter reading should be 500,000 ohms or more. If meter reading is less than 500,000 ohms, check for electrical components that are not properly insulated from the case. Correct insulation if needed.
7.Replace machine cover and screws.
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