Printer Theory Of Operations; Print Engine Theory; Printing Process Flow - Lexmark C950 Service Manual

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Printer theory of operations

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:

1st transfer

Cleaning (Drum/Charge roll)

2nd Transfer

Electric Discharge

Cleaning (Transfer belt/2nd transfer roll)

(Drum/Charge roll)

Cleaning (Transfer

belt/2nd transfer roll

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.

Service Manual

(Drum/Charge roll)

1st transfer

(Drum/Charge roll)

1st transfer

2nd transfer

Electric discharge

1st transfer