Error E511 services required mean part of photosensor that is transfer belt is not being detected
1. power the printer off, wait for 30 sec, and then power it on.
2. remove the photoconductor unit
3. check and clean the photoconductor and transfer belt.
4. clean the TR0 sensor in the printer
5. resolve any toner spillage inside the printer
6. reinstall the photoconductor,close all the covers and then power the printer off and on
if it dosnt work
To check whether the problem is with the printer or the PCU, if possible either try another PCU in the printer, or test the PCU in another printer you know to be working.
I think I it should work.
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