The two most common causes of paper jamming in early white ImageWriter II
printer's were caused by the old style mechanical paper out sensors, and the
older style paper guides which had a stainless steel ribbon shield instead of
the amber colored plastic. If either of these are present then they should be
upgraded. The optical paper out sensor kit is available as part number
076-0250, and the paper guide is part number 949-0029.
Other possibilities are that the platen has been configured for single sheets
which creates a feed rate slightly different than the tractor feed. This can
lead to the paper jumping off of the tractor mechanism. To test for this
problem remove the tractor feed paper from the printer and then try inserting a
single piece of paper into the printer under the platen. There should be very
little resistance. If there is resistance then check to make sure that the
platen is configured for tractor feed paper, that there are no labels or
adhesive residue stuck to the black paper guide, and that the optical paper
guide has been installed and the old metal paper-out sensor plate removed.
If the problem still persists then try temporarily removing the paper guide and
then printing several pages. If the problem disappears then the paper guide is
adjusted too close to the platen. Insert 4 sheets of paper into the printer to
use as a spacer when reinstalling the paper guide, then retest. Inspect the
tractor mechanism for signs of damage and replace if necessary.
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