D-2

MAINTENANCE

D-2

ROUTINE MAINTENANCE
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