Question about HP LaserJet 4700 Printer
I would first suspect the black toner cartridge. This is especially true since you have replaced the Fuser and Transfer Units. Most likely you have a pit or other mark on the drum surface so it is printing the mark on the page at regular intervals as the drum rotates. If you have a spare I would swap it out and I'd be willing to bet it goes away.
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Posted on Sep 29, 2010
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Posted on Jan 02, 2017
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