Not sure why you find it necessary to post about the same issue under different names? Perhaps you would get a reply if it was possible to respond but your post only shows the attachments. I tried 2 different computers to reply.
Also some other info would be helpful when posting on this forum, such as what you did so far, consumable life, page count's, using genuine toners, etc etc
Anyway since i took the time to post this here is first thing I would check with that issue, check the black drum and developer unit (drum life, developer dumped, etc) If it is a C754 the Black still has separate drum & developer units where the colors both drum & developer are together in Image units.
best of luck
Also some other info would be helpful when posting on this forum, such as what you did so far, consumable life, page count's, using genuine toners, etc etc
Anyway since i took the time to post this here is first thing I would check with that issue, check the black drum and developer unit (drum life, developer dumped, etc) If it is a C754 the Black still has separate drum & developer units where the colors both drum & developer are together in Image units.
best of luck
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