Lexmark T650n Service Manual page 237

Registration
Aligner
assembly
Sensor (input)
Sensor (input)
The sensor (input) is located just before the print cartridge and can detect whether media exists in the input
path.
Aligner assembly
The aligner assembly is used to feed the media through the input path and to ensure that media is fed through
the machine in a perfectly straight manner and not in a skewed manner. The aligner assembly can be adjusted
to correct media skew issues and should always be adjusted when it is replaced.
4062-XXX
3-35
Diagnostic aids