ROuTINE MAINTENANCE

D-2	MAINTENANCE	D-2

1.Perform the following preventive maintenance pro- cedures at least once every six months. It is good practice to keep a preventive maintenance record; a record tag attached to the machine works best.

2.Remove the machine wrap-around cover and per- form the input filter capacitor discharge procedure (detail at the beginning of this chapter).

3.Keeping the machine clean will result in cooler operation and higher reliability. Be sure to clean the following areas with a low pressure air stream. See figure D.2 for component locations.

•Power and control printed circuit boards

•Power switch

•Main transformer

•Input rectifier

•Heat sink fins

•Input Filter Capacitors

•Output Terminals

4.Examine capacitors for leakage or oozing. Replace if needed.

5.Examine the sheet metal case for dents or break- age. Repair the case as required. Keep the case in good condition to ensure that high voltage parts are protected and correct spacings are maintained. All external sheet metal screws must be in place to assure case strength and electrical ground continu- ity.

6.Check electrical ground continuity. Using an ohm- meter, measure resistance between either output terminal and an unpainted surface of the machine case. (See Figure D.2 for locations.) Meter reading should be 500,000 ohms or more. If meter reading is less than 500,000 ohms, check for electrical com- ponents that are not properly insulated from the case. Correct insulation if needed.

7.Replace machine cover and screws.

ES 275i