Ricoh 907EX [line pattern] during printing

[RicohUser]

Does anyone know what causes the copier to randomly output a sheet with lines covering the whole area during regular printing.
I have tried several things such as replacing the box where the hard drive is, the double floor back board where the corona wires connect, LD unit, Drum, and more.
IMG_3193.jpg

[slimslob]

Re: Ricoh 907EX [line pattern] during printing

IMHO, if it is electronics it would be more likely BICU memory than HDD. Try replacing the SRAM on the BICU or the entire BICU board.

Bad drum shaft ground or development unit ground could also cause image problems but not that small and not that regularly spaced.

[Codex]

Re: Ricoh 907EX [line pattern] during printing

Had this issue in 3 Pro machines, never solved.I remember that we tried in one machine to change BICU, HDD, check Drum earth, Laser Diode , and Polygon motor. But because the problem occurs very randomly (once a week or so) the other 2 machines are still working in this way.