have download a number of manuals todate , most are excellant, one or two sometimes a little difficult to read but a least avaialable, great site .
Brad.
Text excerpt from page 23 (click to view)
Troubleshooting
Symptom Charts /Paper Feed - 9
Paper Feed
Grinding during paper feed 1 2 3 4 1 Remove platen knob and verify that there are no obstructions in gearing beneath knob. Adjust paper guide (refer to Adjustments). Replace paper feed motor. Replace drive board. Verify that mechanical paper sensor is properly positioned.
Paper-out sensor interferes with paper path; left side of paper fits �tighter� under platen than does right side