Rank: Guru
Rating: 85%, 191 votes
It sounds like you may have a broken (or perhaps stuck) pin in the
printhead. Check for missing dots in other letters also, or if printing
a graphics object, again, a missing dot, consistent throughout the
print.
Other possible causes of a pin not being "fired", are a
small break in the ribbon cable from the printhead to the control
circuit. Look for a tiny crack or break in the ribbon, especially along
the edge. Also, a defect in the electronics which control the printhead
pins will cause this.
If by chance the printhead is all gooped
up with old ink, a pin might merely be stuck. I have taken printheads
out of dot-matrix printers and soaked the pin area (area closest to the
paper) in rubbing alcohol, or used Chemtronics cleaning chemicals to
spray off the old sticky ink. Messy job: don't wear a clean white shirt!
Lastly,
if a pin is broken, either the printhead must be replaced, or sent in
for repair, assuming repair centers still exist. In years gone by, I
have sent in heads, and gotten them repaired successfully.
by:
dodgecharger