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7558-xxx
ADF paper path
Sensor (ADF feed out)
ADF transport rolls
Sensor (ADF scan width 1)
Sensor (ADF scan width 2)
Sensor (ADF scan width 3)
Sensor (ADF registration)
ADF registration
rolls
Scan area
The document set sensor on the ADF tray determines if a sheet is set and correctly positioned on the ADF
document tray. At the same time, a set of sensors also detect the sheet dimensions: the width is determined by
the adjustments on the tray guides, and the length is determined by actuating the photo sensors on the tray
surface.
After executing the command to start scanning, the ADF pick roller rotates to transport the document one by one
to the ADF feed roller and separation roller. As the feed roller moves the sheet towards the ADF transport rolls,
the ADF feed-out sensor detects if the sheet has completely exited the feed roller. At the ADF transport rolls, the
skew of the sheet is corrected in preparation for registration. When the ADF transport rolls feed the sheet
towards the registration rolls, the size of the media is detected and confirmed by the ADF scan width sensors.
In preparation for scanning, the registration sensor detects and confirms if the sheet is correctly positioned on
the ADF registration rolls. Scanning begins when the ADF registration rolls move the sheet to the scan area
where the image will be copied. The scanned sheet is then transported by the ADF feed-out rolls towards the
ADF exit rolls.
If it's a simplex scan job, the scanned sheet is moved by the ADF exit rolls to the ADF output bin.
If it's a duplex scan job, the scanned sheet is fed to the ADF exit rolls. As the trailing edge of the scanned sheet
actuates the ADF inverter sensor, the inverter gate changes position to reroute the paper path. At the same
time, the exit rolls reverse directions to feed the document through the inverter gate, then towards the ADF
transport rolls. The media is fed again and the scanning cycle repeats, this time on the other side of the
document.
Color theory
What is RGB color?
Red, green, and blue light can be added together in various amounts to produce a large range of colors
observed in nature. For example, red and green can be combined to create yellow. Televisions and computer
monitors create colors in this manner. RGB color is a method of describing colors by indicating the amount of
red, green, or blue needed to produce a certain color.
What is CMYK color?
Cyan, magenta, yellow, and black inks or toners can be printed in various amounts to produce a large range of
colors observed in nature. For example, cyan and yellow can be combined to create green. Printing presses,
inkjet printers, and color printhead LED printers create colors in this manner. CMYK color is a method of
Service Manual
3-74
Separation
roll
ADF feed roll
ADF pick roll
Sensor (document set)
Sensor (ADF inverter)
‐
ADF feed out
rolls
Sensor (ADF document tray width 1)
Sensor (ADF document tray width 2)
Sensor (ADF document tray width 3)
ADF exit rolls
Inverter gate
Document tray
Sensor (ADF document tray length 1)
Sensor (ADF document tray length 2)
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