Intermec EasyCoder 501XP, Руководство по обслуживанию

Страница: 75 / 210

Intermec EasyCoder 501 XP & 601 XP – Service Manual 73
Chapter 8 Print Unit
8.7 Printhead, cont.
Replacing the Printhead (EasyCoder 501 XP and 601 XP)
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 periodi-
cal 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.
In early manufactured printers, the magnet could come loose
if excessive force was used to separate the printhead lift arm
from the printhead bracket. If so, use a drop of Loctite 638
glue to fasten the magnet again. Let the glue dry with printhead
in closed position. The glue requires 1 minute to dry, but full
strength is not obtained until after 20 hours
.
• 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 white connector and pull at the con-
nectors rather that at the cables!
• Connect the cables to the replacement printhead assy, blue con-
nector to the left – white connector to the right.
• Insert the printhead assy into the print unit, fi tting the bracket’s
fi ngers over the headlift shaft. Check that the printhead can
move freely up and down.
• Check so the cables will not interfere with the transfer ribbon 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 desired, transfer ribbon again.
Refer to the illustrations on the next page!
For illustrated step-by-step instruc-
tions, please refer to the Maintenance
chapter in the User's Guides.