Replacing The Printhead - Intermec EasyCoder PX4i Service Manual

Chapter 8 — Print Unit

Replacing the Printhead

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The printhead is a consumable part subject to wear from both the thermal
paper or transfer ribbon, and from the rapid heating and cooling process
during printing. Thus, it will require periodical replacement depending on
print volume, type of print media, amount of energy to the printhead, and
several other factors.
To replace a defective or worn printhead, proceed as follows:
• Switch off the power.
• Open the front and right-hand doors.
• Turn the printhead lift lever to "Open" position.
• Remove any media and/or transfer ribbon from the print unit.
• Carefully pull the printhead bracket away from the magnet in the lift
arm.
• Disconnect the hooked fi ngers at the rear of the bracket from the
headlift shaft and pull out the printhead as far as the cables allow.
• Disconnect the two cables from the printhead.
Note the snap-lock on the inner connector. Pull at the connectors, not at
the cables!
• Connect the cables to the replacement printhead assy with the ribbon
cable to the right.
• Insert the printhead assy into the print unit, fi tting the bracket's fi ngers
over the headlift shaft.
• Check so the cables will not interfere with the transfer ribbon, prevent
the printhead from moving freely, or have become jammed between
parts in the print unit.
• Turn the printhead lift lever to "Closed" position, so the magnet engages
the printhead bracket.
• Switch on the power. The printer's fi rmware automatically measures the
printhead resistance at power-up.
• Load media and, if so required, transfer ribbon again.
Refer to the illustrations on the next page! Detailed step-by-step illustra-
tions can be found in the User's Guide, Chapter "Maintenance."
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