Intermec EasyCoder 301 – Service Manual Ed. 3
33
Chapter 7 Print Unit
Replacement
• Turn off the power.
• Open the front and user covers.
• Remove the transfer ribbon
1
and paper.
• Raise the printhead.
• Unhook the spiral spring.
• Slightly lift the front of the printhead and manipulate the rear part
of the bracket so it comes loose from the black plastic moulding.
• Pull the printhead forward and remove the electrical connector.
• Slide in the new printhead, plug in the electrical connector and
hook the spring in position.
• Replace the paper and transfer ribbon
1
.
• Turn on the power.
IMPORTANT!
After completing the physical installation, it is important that the
printer is instructed to measure the resistance of the new printhead
and adjust itself accordingly. This is done by sending the following
instruction:
PRINT HEAD(-1)
The printer will check all dots in the printhead and determine its
mean resistance. Provided you have a two-way communication, it
will return -1 if the printhead is OK, else 0. The resistance value is
saved in the printer’s permanent memory.
The printhead resistance is also measured when a test label is
printed, see chapter 13.1.
Failure to adjust the printer to the printhead resistance may result
in inferior printout quality or premature wear-out of the printhead.
7.6
Printhead,
cont'd.
Plastic Moulding
(black)
Printhead Bracket
Spiral Spring
Printhead Cable
1
/. Not in the LinerLess model.
