100 EasyCoder PX4i and PX6i Service Manual
Chapter 8 — Print Unit
8.9 Ribbon Assist Roller
Description (EasyCoder PX4i and PX6i)
The purpose of the ribbon assist roller is to help the ribbon rewind unit to
keep the transfer ribbon tight, thereby avoiding ribbon wrinkling, which
could ruin the printout. The angle of the ribbon assist roller relative to the
printhead is adjustable.
The ribbon assist roller is subject to very little wear and is expected to last
as long as the printer as a whole. Replacement involves removing the belt
and pulley as well as the upper, outer gable of the print unit (see illustra-
tions in Chapter 8.8.)
Adjustment (EasyCoder PX4i and PX6i)
If the ribbon becomes wrinkled, a few checks should be performed before
the ribbon assist roller is readjusted:
• Is the printhead pressure properly adjusted?
• Is the green edge guide correctly positioned?
• Is there anything that may interfere with the transfer ribbon, for exam-
ple the printhead cables.
If the wrinkling problem remains, proceed as follows:
• Using a #T20 Torx screwdriver, loosen the locking screw that runs in the
crescent-shaped hole in front of the headlift lever.
• Insert a #T20 Torx screwdriver as illustrated on the next page. By turn-
ing the screwdriver, you can move the outer end of the roller back and
forth:
- Turn the screwdriver clockwise to move the end of the roller forward.
- Turn it counterclockwise to move the end of the roller rearward.
• If the ribbon gets wrinkled at the inner edge, you should move the end
of the roller slightly rearward, that is, rotate the screwdriver counter-
clockwise and vice versa.
• Select an appropriate layout, for example a test label, and print it repeat-
edly while carefully moving the end of the roller back or forth, depend-
ing on which side the wrinkling has occurred.
• When the wrinkling ceases, continue the movement ever so slightly to
create a small safety margin. The movement is best detected by the rela-
tion between the roller bearing and the hole through the upper gable.
Another method is to determine the positions where wrinkling starts at
either side and adjust the roller to the middle.
• You will need to print several labels before a new adjustment has any
noticeable effect.
• When you are satisfi ed that the problem is cleared, tighten the locking
screw and test again by printing several more labels. Readjust if neces-
sary.
Refer to the illustrations on the next page!
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General
Weight and Dimensions
