Ribbon Jams - IBM 5100 Maintenance Information Manual

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Ribbon Jams
Check the following items if you are experiencing
frequent ribbon jams:
The ribbon shield is not adjusted properly.
There is improper tracking of the ribbon through
the ribbon feed rolls. The ribbon should not be
above the rollers more than 0.010 to 0.015 inch
(0.254 to 0.381 mm). If the ribbon is above the
rollers, one of the following could be the cause:
• The rollers are not adjusted properly. Check
that the rollers are the same height and are not
cocked.
• The print head cover is hitting the print cable
near the oil reservoir. This can cause the left
side of the head cover to rise and lift the ribbon
off the print head. If this condition is present,
cut a small portion from the head cover where
it hits the head cable.
• The ribbon box may be positioned too low.
Loosen the two screws holding the ribbon box
to the carrier (one on the left side and one in
the bottom of the box), and raise or lower the
box for proper ribbon tracking through the
ribbon rollers. Retighten the screws.
- The ribbon drive rolls are sticking. Remove and
clean the rollers.
There are metal spacers in the ribbon roller
assembly between the rubber rolls and the plastic
housing. Replace the rollers if either spacer is
missing (one at the top of the rollers and one at
the bottom).
- The print wires are protruding beyond the face of
the print head by more than 0.002 inch (0.0508
mm).
The copy control dial is improperly set. The dial
should be set for good print quality on the last
copy and no smudging on the first copy. The
numbers on the copy control dial do not
correspond to the number of parts in the form.
Intermittent Failures Troubleshooting Guide 3-107