M651 jams in output tray when duplex printing

[SherryK1952]

Printer jams in output tray when duplex printing. Don't know how to open the cabinet to check the paper path for duplex

[Repairatrooper]

The right side of the printer is the only door that you can access. Duplex issues are often caused by a worn or damaged fuser or some debris in the paper path. I have seen cases where small fingers on paper guides get broken and that can cause jamming issues.

[SherryK1952]

Thx for your reply. I checked those things but found no problem. I read on another post about running card stock through to clear any debris that might be causing the jam. I did run card stock through the side paper feed and the drawer paper feed. I ran 3 sheets and printed duplex, 3 different times. No jams. Subsequently I ran better paper in both side and drawer trays on duplex and single pages. No jams. Finally I used thinner paper  doing the same tests. No jams. I never saw anything brought out with the exit of the card stock, but so far no jams. I'll report back here again after more time. I hope that this is the solution because the transfer kit has been replaced twice and it didn't solve it.

[Repairatrooper]

Using paper thinner than 20lb is going to be problematic for duplex. If you are printing with heavier color coverage (over 60 percent of page covered, I typically recommend 24lb bond to customers.