It could be a number of things. There are several rollers the page goes through when printing (including the drum it self). They each have a different diameter. You see that repeating horizontal line/zone across the page? That is telling you which roller it is. In service manuals it would tell you the circumference of each roller so you could narrow down your troubleshooting. See if you can get the service manual and if HP still publishes these numbers for your printer.
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