Lexmark C78x Service Manual page 91

Envelope feeder
Before proceeding with this service check, make sure the envelope option is installed correctly.
Step Actions and questions
1 Make sure the envelopes installed in the tray meet
specifications.
Some guidelines that can be used in selection of
envelopes that will minimize the jam rate are:
• Flat envelopes that are not warped or twisted.
• Flexible envelopes that can conform to the paper
path.
• Smooth surface on the envelopes. Rough or ridged
surfaces may cause the envelopes to stick together
in the tray.
• No cotton content, or as little as possible to meet
the user's needs.
• If the envelopes have a pressure-sensitive
adhesive flap, performance might be improved by
reversing the orientation of the envelope in the tray
and reversing the image in the drive or application.
Are any problems found with the envelopes?
2 Make sure the envelopes are loaded correctly. Make
sure the side and back restraints are located and
seated properly.
Are the envelopes loaded correctly?
3 Observe if the envelopes feed from the tray.
Note: You can observe the autocompensator pick rolls
and the envelopes through the tray access door.
Are the envelopes leaving the tray?
4 Check the pick rolls to verify both pick rolls are
installed.
Are any of the pick rolls missing?
5 Check to make sure the autocompensator pick rolls are
correctly installed.
Are the autocompensator pick rolls correctly installed?
6 Observe the pick rolls as they try to pick and feed
envelopes from the tray.
Do the pick rolls turn?
7
Check the autocompensator pick rolls for signs of wear
or contamination.
Are the pick rolls worn or contaminated?
8 If you continue to have problems, replace the complete
envelope option.
Yes No
Inform the Go to step 2
customer of the
problems with the
envelopes that
do not meet
specifications.
Go to step 3 Load the
envelopes
correctly.
Go to step 8 Go to step 4
Go to step 5 Install a new pair
of pick rolls. Both
pick rolls should
be installed at the
same time. See
"Pick rolls
removal" on
page
Go to step 6 Install the pick
rolls correctly.
See
removal" on
page
Go to step 7 Replace the
envelope option.
Replace the pick Go to step 8
rolls. Both pick
rolls should be
replaced at the
same time. See
"Pick rolls
removal" on
page 4-70.
Diagnostic information
5061
4-70.
"Pick rolls
4-70.
2-47