|Printer and Photocopier Troubleshooting and Repair Collection : HP LaserJet III paper jam
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"I have two LaserJet IIIs that complain about a paper jam on power up,
right after the self test (i.e. before I've even had a chance to send
anything to the printer)."
(From: Terry (firstname.lastname@example.org).)
The most likely cause of this problem is the exit sensor arm or
photointerrupter or the dc controller board. Standing in front of the
printer with the top cover up it will be in the far left lower corner.
(From: Wong Sy Ming (email@example.com).)