User Guide

The tray 2 cassette can detect the media size by using the switches described; however, the user
can define the media size for the tray by using the control panel (see
Paper-handling menu). In this
case, the printer might not detect the media size correctly if the size that the user defined does not
match the tray settings.
To prevent a false size-detection, the printer measures the time it takes for the media to pass
through the printer and determines the size of media that was fed from the tray. When the measured
size differs from the user defined size or from the media size-switches, a message appears on the
control-panel display (see
Alphabetical printer messages).
Lifter-driver operation
The lifter driver keeps the tray 2 media-stack surface at a specific level in order to have a stabilized
pickup operation regardless of the size of the media in the tray 2 cassette. The dc controller PCA
operates the lifter-driver motor (M103) for 50 seconds. The motor stops when the paper-stack-
position sensor (PS107) detects the media. If the paper-stack-position sensor does not detect any
media within 8 seconds after the lifting operation has begun, the dc controller PCA determines that a
lifter-driver motor failure has occurred, and a message appears on the control-panel display (see
Alphabetical printer messages or Numerical printer messages). The dc controller PCA stops the
lifting operation if the paper-stack-position sensor detects that the tray 2 cassette is missing.
120 5 Theory of operation