Toshiba B-EP Series Key Operation Specification page 143

6.6.7 Label Paper Loading Method
<Reflective sensor adjustment>
Place a specified paper in a manner so that the label
(red dashed line) comes in contact with the reflective
sensor.
Label paper
<Transmissive sensor adjustment>
Remove a few labels from a specified paper and place
the backing paper (red dashed line) in a manner so that
it comes in contact with the transmissive sensor.
<Adjustment without paper>
Do not place a paper in the printer.
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Head (printer) side
Reflects
Cover side
Head (printer) side
Backing paper
Transmits
Cover side
Head (printer) side
No paper
Cover side