GPX X642 User Manual

The MFP can print directly on transparencies designed for use in laser printers. Print quality and 
durability depend on the transparency used. Always print samples on the transparencies you are 
considering before buying large quantities. 

The Paper Type setting should be set to Transparency to help prevent jams. In Macintosh, be sure to 
set the Paper Type to Transparency in the Print dialog on the Imaging choice in the Copies & Pages 
pop-up menu. 

Use transparencies designed specifically for laser printers. Check with the manufacturer or vendor to 
determine whether your transparencies are compatible with laser printers that heat transparencies to 
230°C (446°F). Use only transparencies that are able to withstand these temperatures without 
melting, discoloring, offsetting, or releasing hazardous emissions. For detailed information, see the 
Card Stock & Label Guide, which is available on the Lexmark Web site at 

.

Transparencies can be fed automatically from the multipurpose feeder and all standard and optional 
trays, except the 2000-sheet drawer. Before loading transparencies, fan the stack to prevent sheets 
from sticking together.

Be careful when you handle transparencies. Fingerprints on the surface of the transparency cause 
poor print quality.

You can load up to 10 envelopes in the multipurpose feeder and 85 envelopes in the envelope feeder. 
Try a sample of any envelopes you are considering using with the MFP before buying large 
quantities. See 

 and

 for 

instructions on loading envelopes.

When printing on envelopes:

To achieve the best possible print quality, use only high-quality envelopes that are designed 
for use in laser printers.

Set the Paper Size/Type in the Paper menu to MP Feeder, Manual Env, or Env Feeder 
depending on the source you are using. Set the paper type to Envelope, and select the 
correct envelope size from the control panel, the MFP driver, or from MarkVision™ 
Professional. 

For best performance, use envelopes made from 75 g/m

2

 (20 lb bond) paper. You can use up 

to 105 g/m

2

 (28 lb bond) weight for the multipurpose feeder or 105 g/m

2

 (28 lb bond) weight 

for the envelope feeder as long as the cotton content is 25% or less. Envelopes with 100% 
cotton content must not exceed 90 g/m

2 

(24 lb bond) weight.

Use only new, undamaged envelopes.

For best performance and to minimize jams, do not use envelopes that:

Have excessive curl or twist.

Are stuck together or damaged in any way.

Contain windows, holes, perforations, cutouts or embossing.

Use metal clasps, string ties, or metal folding bars.

Have an interlocking design.