Datamax-O'Neil S-Class User Guide - Manual (Page 39)

S-Class 31
 Grasp the Nut to move the Media Sensor. Position the sensor so that
it can see the Quiet Zone and the TOF Marks on the ticket stock, as
described in Section 4.0.
 Tighten the Nut securely.
 Turn ‘On’ the printer and load ticket stock; see Section 3.2.
 To verify the alignment, press the FEED button several times – the
stopping point should be the same for each ticket that is output. Note
that if the Fault Indicator illuminates, the sensor needs to be
repositioned (see Section 5 for a complete listing of possible causes).
4.0.2
SV Model Media Sensor Adjustment
 Loosen the Thumbscrew and adjust the Media Guides to fit the width
of the ticket stock:
The guides should be positioned so that there is no side-to-side ticket
movement (too loose), but not so close as to cause friction or bowing
of the ticket (too tight). (See Step 5 in Section 3.2.1 for an
illustration).
Once properly positioned, tighten the Thumbscrew to secure the
Media Guides in place.
 Unlock and lower the Printhead Assembly.
 Grasp the Media Sensor to move it. Position the Media Sensor so
that is can see the Quiet Zone and the TOF Marks on the ticket stock,
as described in Section 4.0.