General Maintenance Procedure 

Yearly 
1.      Blow out rectifier/inverter with a low-pressure air hose.
2.      Make sure all connections are tight.
3.      Perform a visual check on all internal components.
4.      Check front panel meters and alarms for accuracy.  

4th Year 
 
REPEAT ABOVE WITH THE ADDITION OF: 
1.      Check relay contacts for pitting or corrosion.
2.      Check capacitors for leakage.  

7th Year
 
REPEAT ALL, WITH THE ADDITION OF: 
1.      Filter, resonating capacitors and control relays should be replaced.  

10th Year
 
REPEAT ALL WITH THE ADDITION OF: (except replacing capacitors and control relays, they should be replaced every 7 years) 
1.      Check magnetics, components and wiring for signs of excessive heat.