Hi I have a canon LC 830i and I am having jamming problems. The paper is picked up out of the cassette and stops intermittently at the registration roller. If I open up the back of the machine you can see the pick up gear turn and the registration clutch does not fire,Then the pick up gear will turn again and the clutch does not fire.and again. Then it will jam at the registration roller. This does not happen all the time. I can make any where from 1-50 prints and no jam. But when it does jam it will stop every time at the registration roller.
Parts replaced-
Pick up Rollers
Sep Rollers
Registration clutch
Torque limiter
Registration sensor and flag unit

any one have any ideas??