ASTRO-MED QLS-2000XE SERIES, Operation & Setup Manual, Page: 102 / 214

5-14 Printer Maintenance
To install the media sensor assembly:
1 Ensure the printer is still off and unplugged.
2 Position the media sensor assembly back into place.
Feed the gap top-of-form (TOF) sensor harness through the square hole
behind the media sensor bracket mounting location. Feed the reflective
top-of-form (RTOF) sensor harness through the small round hole located
near the lower-left corner of the media sensor bracket.
3 Mount the media sensor assembly using the four Phillips screws (with
locking washers). When mounting the sensor, ensure all of the screws
are in place, and then tighten each screw. This process ensures the sensor
is mounted evenly.
4 Plug in the new harnesses to the marked harnesses inside the printer.
5 Re-install the back cover.
6 Plug in the printer and turn the power on.
7 Calibrate the printer using the calibration procedure found earlier in the
manual.
If the printer does not calibrate successfully, adjustments to the TOF or
RTOF sensors may be required.
Gap (TOF) Sensor Adjustment:
1
Load paper media into the printer.
2 Position the stock sensor.
3 Monitor voltages at test point T2 and adjust R43.
3.5 VDC + 0 VDC - 0.25 VDC
4 Verify the voltage is low (< 1.5 VDC) with just the carrier in front of
the sensor. If the low level does not go below 1.5 VDC, then adjust
the low to 1.2 VDC and the high level may only reach approximately
2.5 VDC.