Kyocera 1135 4201 jams

[JR2ALTA]

Machine has many j-4201 (exit sensor not reached). I could never duplicate. After replacing feed rollers and drive pack client still complained. Finally they left it jammed and it was a sheet of paper under the drum just at fuser entrance but short of the fuser itself.
I scraped off a lot of hardened toner from that area and ran a couple hundred but wondering if anyone has seen this out there.

Thanks in advance.

[D Colour]

Have you had a look at this thread?

ECOSYS M2535dn jamming

[taskalfa]

Machine has many j-4201 (exit sensor not reached). I could never duplicate. After replacing feed rollers and drive pack client still complained. Finally they left it jammed and it was a sheet of paper under the drum just at fuser entrance but short of the fuser itself.
I scraped off a lot of hardened toner from that area and ran a couple hundred but wondering if anyone has seen this out there.

Thanks in advance.

Check the Mylar guides under reg roller, I remove them altogether, they seem to work better without