Printronix SL5000r Quick Setup Manual page 36

Calibrating The Printer
To avoid this problem, increase the Threshold Range value to 60%
in the CALIBRATE CTRL menu (the default is 50%), then run an
Auto Calibrate again (page 30).
NOTE: Any changes to Threshold Range will not take effect until
This will raise the Gap/Mark threshold high enough so that the
printer will not falsely use the antenna or noise as the gap (top-of-
form).
255
191
127
Paper Out(075)
063
Gap/Mark(040)
000
36
you run an Auto Calibrate again.
Detected Amplitude
of the Antenna
Detected Amplitude
of the Gap