Envelope Printing Slows Down After the First Few Prints

If your customers print large numbers of envelopes or other narrow media on Lexmark printers, they may wonder why the printer slows down after quickly printing the first dozen or so pieces.

Here’s why:   Lexmark printers have a built in safety feature that protects the fuser from damage when printing on envelopes or on narrow media.

When an envelope print job is sent to the printer, the first 10 to 20 envelopes will print at normal speed but then the printer slows down for the remainder of the print job. The narrow media is sensed by the fuser, which signals the machine to modify the print speed.

The reason for the slower print speed is to prevent the hot roller in the fuser from becoming warped or out of round. When the envelope goes through the fuser, it only comes in contact with the fuser rollers on the left side, therefore the heat needed to bond the toner to the envelope only dissipates from that section of the fuser. The right side of the fuser dissipates less heat since there is no media running through it. The printer slows down to keep the fuser at a consistent temperature.

The hot roller would warp or become out of round if one side was running significantly cooler than the other. This is not a problem when printing on regular width paper since, obviously, the paper is wide enough to dissipate heat evenly.
Ron Marquez is a Lexmark certified printer technician and Depot Manager at Market Point. If you have a question regarding this topic or have any other printer repair related questions or topics for which you would like more information, please send an email to maryp@marketpoint.com.

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