Intermec EasyCoder 501 XP Service Manual page 52

8.6 Label Stop Sensor,
cont.
1
/. It is possible to decide if the media
feed data will be cleared or not when
the printhead is lifted by means of the
Fingerprint instruction SYSVAR(28.)
By default, the media feed data are not
cleared. Introduced with Intermec Fin-
gerprint v7.12.
Intermec EasyCoder 501 XP – Service Manual Ed. 4
Var. Length Strip and Fix Length Strip
The light is emitted from the upper sensor and received by the
lower sensor. The beam will either be blocked by the media or be
completely uninterrupted when the printer runs out of media. The
fi rmware assumes an out-of-paper condition if the light has not
been interrupted within a media feed corresponding to 150% of the
set length (Setup\Media\Media Size\Length.)
In case of "variable length strip", the printer will feed out an extra
195 dots of media after the last dot of the print image to allow the
strip to be torn off. Note that the print image may contain "invis-
ible" dots, such as the "white" parts of a character cell or an image,
or a space character.
General
The information on where the gaps or marks are presently posi-
tioned relative the LSS (and thereby also relative the dot line on the
printhead) is saved as an "invisible" fi le in the fl ash memory's fi le
operating system (see Chapter 15.2.) However, if the printhead is
lifted, or if the power is interrupted during printing, this fi le may be
cleared 1 , which will affect any labels between the LSS and the dot
line. In this case, perform a TESTFEED operation.
The LSS checks for gaps or marks at every dot of positive media
feed (feed out/print), but gaps or marks are ignored at negative
media feed (pull back.) Gaps and black marks up to 256 dots (21.3
mm/0.84 inches) are allowed.
Adjustment of the Sensitivity
The LSS should always be adjusted after changing to another brand
(sometimes even batch) of media, and when a defective sensor
has been replaced. This is especially the case with self-adhesive
labels on liner (backing paper), since the transparency of the liner
may vary and the difference between labels and gaps may be too
small. Before starting the adjustment, check that both the upper
and lower sensor are clean and free from obstructions and that the
edge guides are adjusted so as to guide the media with a minimum
of play. Also check that the LSS is laterally positioned so as to
detect the gaps or black marks, whenever such media are used.
As standard, there are four means of adjustment for the LSS:
• Performing a TESTFEED by simultaneously pressing the
"Shift" and "Feed" keys in the Immediate Mode.
• Selecting the TESTFEED option in Intermec Shell.
• Selecting the TESTFEED option in the Setup Mode.
• Executing a TESTFEED statement in a Fingerprint program.
The printer feeds out 1.5 times the set label length while testing
all levels of the LSS at each millimetre of media feed. The LSS is
adjusted according to the result of the check and a full label is fed
out in accordance with the present feedadjust setup.
The label stop sensor/black mark sensor can be turned off for a
specifi ed amount of media feed by means of the LBLCOND state-
ment, see Intermec Fingerprint v7.xx Reference Manual.
Chapter 8 Print Unit
51