Archived from groups: comp.sys.laptops (More info?)
> HP Laser jet printer making a rhythmic clunk as it's printing Model
> is HP Laser Jet 6p.
It's difficult to abswer your query as there are so many things it could be.
Pull the toner cartridge and make sure all of the drive sprockets are
properly fitted. Check the toner cartridge for foreign bodies. (I once found
a 6" long piece of plastic flashing sticking out of one of mine!).
Next thing to check would be the motor's drive sprockets and gear train.
This requires a partial disassembly of the machie and you can find
directions on the HP parts website: http://h20141.www2.hp.com/hpparts/
Some older HP LJ printers had a known problem with drive sprockets coming
adrift on their shafts and causing a "clunking" noise when printing.