Hi, I have a HP 3550 which is streaking all the colours vertically doen the page, especially on the right hand side. All toners and transfer belt have been changed. Fault happens before the fuser, you can see the streaks on the transfer belt. All toners are original. A bit stumped as to what else could be causing it. I've had this problem in the past with other 3500/3700 series and replacing toners and belt has always cured the issue.
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