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. Continue Reading

Lexmark Autocompensator 101

It’s fairly simple in design (see diagram at the end of this post). A motor turns some gears that in turn rotate the shaft the rollers are attached to. In theory the design’s use of force makes the media in the tray inconsequential. No matter what media is being used, from tissue paper to card stock labels, the Autocompensator will deliver it to the imaging part of the printer one page at a time. Also, in theory, the Autocompensator cannot fail. In theory.

From the Lexmark Optra S to the Lexmark T630s the Autocompensator had a spring operated clutch on the roller shaft that only allowed the shaft to turn in one direction. That made it real easy to troubleshoot. The spring clutch, gears, motor, etc. rarely fail. However, the rollers get slick and then can’t move the media from the tray to imaging. Thus, you’d get a paper jam error but no jammed paper could be found. Simple fix: replace the rollers and all is well with the world.

One common problem to avoid is installing the rollers on the wrong side. They’re directional. Look at the sides of the rollers to observe the direction of the arrows. Always make sure they are pointing toward the front of the printer. Continue Reading