Canon IRAC 5051 copy quailty just goes light in middle of printjob

[nicknt82]

At a loss have tried so many things.
I swapped out the ITB assembly with known good one ran itb int still did the same thing.
Swapped out known good 2nd transfer unit on door. Same issue
Swapped out patch sensors front and back same issue
swapped out patch timing sensor in middle inserted code off of board same issue.

had a change in results when I replaced all 3 color drums. It was good for approx 200 pages then now it errors lite on a run for a bit then gets better.
also it can be lite on one side of a double sided run but good on the other side of the same page.

what else would you try??

I thinks you should replace whole of right door, not only transfer roller.

[skynet]

Open the right door inside the machine is a metal roller below the registration on the left side of this roller is a leaf spring check this is in contact with the roller.

[wachman]

Sorry for the big delay in getting back on this issue. I value all of those who replies thank you so much for your help!

In the end It was resolved with all new drums. the black one was affecting all the others. odd because I used 100% Canon supplies.

I have seen this on the HP cm2320 printer style where a drum would error and cause full horizontal patch lines.

I am assuming that the Drum grounds must all be connected and one can effect all the others.