Originally Posted by
dan7777
I . Clutch, sensor, paper path rollers, registration rollers. Also the sensor arm could be worn down from paper hitting it (now the updated flag has metal over the plastic) or dust in sensor. The clutches get worn or get rust in them and make them slip. My theory is as long as you don't keep doing the same thing eventually you stumble on the problem. I don't remember on that model but Canon put dampers behind the flags that over time are sticky causing jamming problems or registration problems. .
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