Lexmark 4039 - B/W Laser Printer, Service Manual

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Diagnostic Information
31
4039-1XX
If the problem is still present, replace one at a time the:
1. ROM SIMM
2. System board
Vertical Void or Streak
Do a developed image test to determine if the defect is occurring
before or after the transfer process.
If you see the defect on the photoconductor, check the operation of
the printhead shutter and clean the printhead window with a lint-free
cloth folded over a cotton swab; do not use a bare swab and do not
use any cleaning fluids or water on the printhead window. Inspect
the HVPS contacts.
If the image on the photoconductor is good, inspect the fuser rolls
and transfer roll. Make sure the left transfer roll bearing is contacting
the contact from the HVPS. Make sure the HVPS contacts are clean
and spring back when pressed.