Lexmark X95 series, Руководство по обслуживанию

Страница: 412 / 1182

3-60
Service Manual
7558- xxx
Go Back
Previous
Next
Printer theory of operations
Print engine theory
Four toner cartridges (cyan, yellow, magenta, and black) are used to create text and images on media. Each of
the colors has a photoconductor drum and an image transfer unit (ITU). To obtain a print output, each drum will
undergo the following processes:
1. Charge
2. Exposure
3. Development
4. 1st transfer
5. Cleaning (Drum/Charge roll)
6. 2nd Transfer
7. Electric Discharge
8. Cleaning (Transfer belt/2nd transfer roll)
9. Fusing
Printing process flow
In summary, the printer’s controller board receives print data and the command to print. The controller board
then initiates the print process. The controller board is the command center for the EP process and coordinates
the various motors and signals.
The high-voltage power supply sends a charge to various components in the EP process. The printhead LED
arrays fire on the photoconductors and alter the surface charge relative to the planed image for each
photoconductor. Each photoconductor rotates past its respective developer roll, and toner is developed on the
surface of each photoconductor. The four separate color images are then transferred to the transfer belt as it
passes under the photoconductors. After the image is transferred to the transfer belt, the photoconductors are
cleaned and recharged.
The transfer belt carries the four-colored image towards the transfer roll. Media is picked up from the tray and
carried to the transfer roll where the image is then transferred from the transfer belt to the media. The timing of
the paper pick is determined by the speed of the transfer belt.
The media is carried to the fuser belt and roller where heat and pressure are applied to the page to permanently
bond the toner to the page. The fuser rollers push the media into the output bin. The transfer unit is cleaned and
the process begins again for the next page.
DRUM (Y)
charge exposure
Cleaning
(Drum/Charge roll)
development
1st transfer
DRUM (M)
charge exposure
Cleaning
(Drum/Charge roll)
development
1st transfer
charge exposure
Cleaning
(Drum/Charge roll)
development
1st transfer
charge exposure
Cleaning
(Drum/Charge roll)
development
1st transfer
Cleaning (Transfer
belt/2nd transfer roll
2nd transfer
Electric discharge
Fusing
Belt
Paper
DRUM C DRUM (K)