Intermec EasyCoder PX4i Service Manual page 87

Testing the LSS
EasyCoder PX4i and PX6i Service Manual
Var. Length Strip and Fix Length Strip/Continuous
The light is emitted from the diode in lower part and received by the
sensor in the upper part. The beam will either be blocked by the media
or be completely uninterrupted when the printer runs out of continuous
stock. 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.
General
The information on where the gaps or marks are presently positioned
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 raised, or if the power is inter-
rupted during printing, this fi le may be cleared, which will affect any labels
between the LSS and the dot line. In this case, readjust the LSS using a
TESTFEED operation (Fingerprint) or by pressing the <Feed/Pause>
button (IPL).
Note (Fingerprint only): It is possible to decide if the media feed data
should be cleared or not when the printhead is raised using the Fingerprint
instruction SYSVAR(28). By default, the media feed data are not cleared.
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 (retract).
Gaps and black marks up to 170 dots (21.3 mm/0.84 inches) are allowed.
In the Print Defi nes part of the Setup Mode, you have two ways to test the
label stop sensor if you encounter a detection problem; LSS Auto and LSS
Manual.
The menus only provide indications from the label stop sensor unit. The
testing menus can determine if the sensor unit is not physically in position,
is blocked by dust or stuck labels, or is defective in some way. Furthermore,
this is an aid if media has detection complications.
Note: There is no way to adjust the LSS-function; the menus only indicate
values from the LSS obtained by performing a testfeed operation.
LSS Auto is the quick and normal way to determine if the label stop sensor
works properly and is able to detect gaps, slots, or black marks.
LSS Manual shows the actual setting provided by the latest testfeed
operation. It is also possible to try other settings. LSS Manual is primarily
intended for service and is not described in the User's Guide.
LSS Auto
• Check that the printer is set up for the type of media loaded in your
printer.
• Perform a testfeed by simultaneously pressing the <Shift> and <Feed>
keys on the printer's keyboard (Fingerprint) or by pressing the <Feed/
Pause> key (IPL).
• Make sure that there is a label—not a gap or mark—at the LSS.
Chapter 8 — Print Unit
77