Media Feed Principles - Intermec EasyCoder PX4i Service Manual

Chapter 8 — Print Unit

8.10 Media Feed Principles

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Fingerprint only
The Start and Stop Adjust parameters in the Fingerprint Setup Mode con-
trol how the media will be positioned in relation to the printhead when the
printing starts and after the printing is completed, respectively. By default,
the Start and Stop Adjust parameters are both set to 0, which is suitable for
tearing off the media against the tear bar, for example between labels or at
the perforation in a pre-perforated continuous stock. However, because the
dot line on the printhead is situated 15.7 mm (0.62 inches) back from the
tear bar, the printing will not start at the top of the label but further back
along the media path.
Note: Due to several factors, media feed measurements are not exact and
may vary somewhat between applications and individual printers. There
is inevitably a small amount of slippage between media and platen roller,
which in its turn is affected by printhead pressure, type of media or liner,
thickness of the media, roll size, type of media supply device, etc. The
platen roller may be worn, giving it a slightly smaller diameter and/or less
friction. There is also a certain amount of inexactness in the media feed
mechanics and belts and so on. Therefore, the operator cannot expect to
reach exact Start and Stop Adjust values simply by calculation. Use the
measurements given in this chapter to calculate rough starting points and
use the trial-and-error method to fi nd values that give the desired result.
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