Contact Image Sensor (Cis); Document Sensors - Lexmark X125 Service Manual

4412-00X

Contact Image Sensor (CIS)

The contact image sensor unit consist of LEDs, rod lens array, and a
photo sensor. The LEDs illuminate the document to be scanned
when the leading edge is detected by the document scan sensor.
The LEDs turn off when the document exits the scanner mechanism.
The LEDs illuminate the document to obtain an image from the
document through the rod lens array, where the image is translated
into voltage levels.

Document Sensors

There are two document sensors in the scanner mechanism; the
document detect and the document scan sensor. The document
detect sensor, detects whether or not a document is loaded, and the
document scan sensor detects the scan position of the document.
The scanner mechanism consists of components which feed, scan,
and eject the documents that are to be copied or transmitted to a
remote facsimile unit.
Service Mode
In service mode (tech) mode, the technician checks the machine
and performs various tests to isolate the cause of a malfunction.
To enter the service mode, press Menu, #, 1, 9, 3, 4 in sequence,
and the LCD briefly displays T. The machine has entered service
(tech) mode. While in service mode, the machine still performs all
normal operations. To return to normal user mode, press Menu, #, 1,
9, 3, 4 in sequence again, or turn the power off and then on by
unplugging and plugging the power cord.
Options changed while in service mode do not remain changed
unless you clear the machine memory.
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Service Manual