GPX X642 User Manual

Have postage stamps attached.

Have any exposed adhesive when the flap is in the sealed or closed position.

Have nicked edges or bent corners.

Have rough, cockle, or laid finishes.

Use envelopes that can withstand temperatures of 230°C (446°F) without sealing, excessive 
curling, wrinkling, or releasing hazardous emissions. If you have any doubts about the 
envelopes you are considering using, check with the envelope supplier.

Load only one size of envelope at a time in the envelope feeder.

A combination of high humidity (over 60%) and the high printing temperatures may seal the 
envelopes.

The MFP can print on many labels designed for use with laser printers. These labels are supplied in 
letter size, A4 size, and legal size sheets. Label adhesives, face sheet (printable stock), and topcoats 
must be able to withstand temperatures of 230°C (446°F) and pressure of 25 pounds per square inch 
(psi).

Try a sample of any labels you are considering using with the MFP before purchasing a large 
quantity.

For detailed information on label printing, characteristics, and design, see the Card Stock & Label 
Guide available on the Lexmark Web site at www.lexmark.com/publications.

Note: Labels are one of the most difficult print media for laser MFPs. All MFP models 

require a special fuser cleaner for label applications to optimize feed reliability. See 

 for information on obtaining a label fuser cleaner.

For detailed information on label printing, characteristics, and design, contact the place where you 
bought your MFP.

After printing approximately 10,000 pages of labels (or each time you replace the print cartridge), 
complete the following steps to maintain MFP feeding reliability:

Print five sheets of paper.

Wait approximately five seconds.

Print five more sheets of paper.

When printing on labels:

Set the Paper Size/Type menu item to Labels in the Paper menu. You can set the Paper Size/
Type from the MFP control panel, the MFP driver, or from MarkVision Professional. 

Feed vinyl labels from the standard 250- or 500-sheet trays or the optional 250- or 500-sheet 
drawers. For vinyl labels, set the Paper Type to Labels, the Labels Texture to Smooth, and the 
Label Weight to Heavy, or set the Paper Type to vinyl labels and the texture and weight to 
normal.