I have an HP 4650 that's out of warranty. Whenever I print a black and white page the text fades out the closer that it gets to the right hand side of the page, right up until it vanishes all together. However whenever I print color this does not happen. Even if there is only a little bit of color on the page the print out is perfect. My toners are all full, my imaging drum is at about 90% but my developer is at about 10%. I have also checked the distribution of ink inside the toner cartridge and they are all OK. The diagnostic prints are all perfect. What could be wrong? I'm certain that it's a hardware problem but a not certain where it stems from.

I have an HP 4650 that's out of warranty. Whenever I print a black and white page the text fades out the closer that it gets to the right hand side of the page, right up until it vanishes all together. However whenever I print color this does not happen. Even if there is only a little bit of color on the page the print out is perfect. My toners are all full, my imaging drum is at about 90% but my developer is at about 10%. I have also checked the distribution of ink inside the toner cartridge and they are all OK. The diagnostic prints are all perfect. What could be wrong? I'm certain that it's a hardware problem but a not certain where it stems from.
Tried a print with text as the black, as in images the black will be made up from 'composite' black, with the C, M and Y toners. Open printer remove all toners, I seem to recall the BLACK is at the bottom, Check for toner spillage around the laser opening for the black drum. If there is some, this needs carefully removed. If you do not have access to a proper toner vacuum, remove as much as you can with VERY MILDLY moist tissue (kitchen roll, not toilet paper, the stronger stuff) and then clean the lens to the laser with a dry tissue.

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