Resolution:

Perform the sensor tune to calibrate the sensors to the ambient light source.

- Remove paper from all paths.
- Turn off the printer power.
- Press and hold the LF and FF keys, and turn the printer power on- 
  the display shows INITIAL MENU.
- Release the keys- the display shows INITIALIZE.
- Press the UP arrow key until the display shows SENSOR TUNE.
- Press the  ENTER key- the display shows TUNE > N.
- Press the UP ARROW- the display shows TUNE > Y.
- Press the  ENTER key- the display shows SENSORS TUNING.
- After the sensor tune is complete, the display will show INTIALIZE.
- Turn off the printer power.
- Wait 10 seconds, then turn the printer power on.


NOTES:

- A sensor tune is recommended when first installing a printer, or if the printer is
  moved to a different location.

- If the sensor tune is performed with paper loaded, the sensors will be incorrectly
  calibrated, and problems will be compounded.

- If the printer is placed inside any enclosure, a sensor tune MUST be performed or 
  the printer will be susceptible to hard paper jams.

- Hard paper jams occur when the sensor indicates paper is installed when it is 
  actually out:

   Normally, when the paper is out and the LOAD/FF key is pressed, the print head moves
   to the right and the mylar upper paper clamp opens to the load position.

   If paper is in, and the LOAD/FF key is pressed, the print head and the paper clamp 
   do not move.

   If the printer does not sense that the paper is out, then when paper is loaded the 
   paper clamp does not open, and paper jams against it as it loads.