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QLS-4100 X 92
After normal use or as a result of a failure, the printheads will eventually need to
be replaced.
Some symptoms of printhead failure include:
• Significant reduction in printed image darkness that cannot be corrected by
using an increased print intensity.
• Vertical line(s) of missing print running through the entire length of the label.
• A wide vertical area of missing print indicating physical wear to the printhead or
an electrical failure
The following procedure explains how to remove and replace a printhead.
Caution
Printheads can be damaged by static electricity. Always use standard
anti-static procedures when replacing printheads.
Caution
To prevent personal injury or damage to electronic components, ensure
that the printer is turned off and the power cord is disconnected.
Turn the printer off and unplug the AC power cord. Lift the printer’s side cover.
Remove the black guide roller under the static brush for easier access to the
printhead mounting screw. There are three inline screws on the outer plate at the
end of the guide roller. Remove the two lower screws and pull on the tab to slide
the center shaft out, releasing the guide roller to drop down.
Remove the platten roller if you are changing the printhead on print station #1.
Use a Phillips screwdriver to loosen the captive printhead mounting screw over
the top of the printhead.
Raise the printhead assembly by the handle to allow the printhead to drop down
away from the bracket.
Gently pull the printhead out to the side until the three connectors on the top of the
head are exposed.
Disconnect the three printhead harness connectors on the printhead by pulling
straight up on each of the harnesses.
Printhead Replacement
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