Xerox Phaser 6115MFP Service Manual page 91

Theory of Operation
If the paper type specified by the controller when a print request is made does
not match the results of Transparency Sensor detection, the machine
suspends the print cycle and displays a corresponding message on the
control panel.
OHP Sensor
Reflection Mirror
s6115-100
Media Size Detection
Media size is detected using the Registration Sensor. The length of the media
is determined by the length of time the Registration Sensor remains High
indicating media in the registration section.
If the media size specified by the controller does not match the media size
detected by the Registration Sensor, the system displays an error message
on the Control Panel. The sheet causing the size error continues through the
print process and is output to the tray. Operations for subsequent sheets are
specified from the controller.
Phaser 6115MFP Multifunction Product Service Manual 2-47