
Page Setup
Parameters Used
104
P1003640-001 TTP2100 Technical Manual 10/22/2008
Garbage, Black-mark, and Out of Paper Detection
For every step the paper is feed, the black-mark sensor is sampled to detect garbage, black-
marks or out of paper.
When the printer detects blackness is has to check if it is only garbage; if the paper gets white
again within n40 x 0.125 mm, then it is garbage and the spot is ignored. If it is still black after
n40 x 0.125 mm, it is probably a black-mark.
If the paper gets white within an additional n39-n40 plus 5 mm then it is a black-mark. The 5-
mm is a constant added to make sure that noise on the edge not will interfere with the samples.
If it at this point still is still black we have detected out of paper.
Important • Be careful about n40 and n39. If n39 – n40 is to small, then the minimum
detection area will be too little. This area should not be less than a millimeter.
Garbage range n40
Printed black mark n39
Valid black mark range (n39 – n40 + 5mm)
5 mm
Constant
Out of paper
n37 &
n38
n39
10 mm
Detection
area
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