Here is a post I found how someone else fixed their problem. Good Luck
I was getting the same fake paper jam and improper shutdown error
messages on this POS printer. I blew it out with compressed air - but
that was no help. To watch what was going on, I stuck a pen top in the
open cover switch sensor (see top image at
http://windowshopusa.com/hp_8500_POS.html
). It didn't appear that the cog wheel was the problem - it made no
clicking noise or anything - the print head just traversed from R to L,
then errored.
After I removed the sliding cover on the right, and
with the print heads out of the way, I noticed that the chrome
hold-down clip (bottom image) was crooked, and this prevented the print
heads from traveling all the way to the right, causing the fake paper
jam. Straightening the clip fixed the problem. (I didn't have to remove
the clip, just pushed it straight - it's not in very tight.)
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