Auto Density Sensing - Lexmark X940e Service Manual

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At the beginning of each individual printer cycle, the Printhead scans the surface of the drum, further discharging

any residual DC charge that may be left on the drum.

Erase lamp LED array

Auto density sensing

Image density

sensor assembly

The image density sensor assembly uses a reflection type sensor that detects a pre-placed toner patch and

image on the transfer belt and outputs pulses when the central line of the patch image aligns with the central line

of the detector. The sensor outputs pulses at the timing the patch image passes the sensor. Therefore,

observing changes of intervals at which pulses are output leads to color mis-registration detection. If no color

mis-registration occurs, pulses are output at regular intervals.

General information