Lexmark Optra N 4040, Reference Handbook

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Laser Printer Reference Handbook
4040
Adjustments
Envelope Feeder Separation Guide and Lower
Separation Roller Gap Adjustment
Under normal conditions, remove the separation guide along with the
upper cover. If you removed just the separation guide or replaced a bent
separation guide, adjust the gap as follows:
Insert the separation guide 1.5 mm from the lower separation roller.
Adjust its position by inserting the thickness gauges (1 mm and 0.5 mm)
into the gap between the separation guide and the lower separation
roller.