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Jammed paper must be removed, and is the most common problem. Opening the front of the copier and following the directions on the inside of the copier is the best way to deal with this. Often jams are caused by moistened or curled paper. Keep paper in a cool, dry place.
Keep your copy machines clean. Dust and transferred ink can poorly affect the copy machine.
Replacing the toner cartridge can also help troubleshoot light and dark spots on the page, and is much easier than calling a technician from the copy machine leasing company.
If all else fails, then you need someone who really knows copiers. Call a pro.