I've boaght a C-250 with boot issue (25%). After firmware update solved. Exposure lamp belt mounted, because it was used for another machine. Everything seems ok. Sometimes scanning or copying from DF site complete black or different colours but no original, sometimes ok. From glass always ok. I thougt it caused to awful justaged DF, but justage didn't help. Thanks for help!
Edit: didn't we have this problem here. But I don't find.
Edit: didn't we have this problem here. But I don't find.