Lexmark W820 - Optra B/W Laser Printer Service Manual page 104

Step Actions and Questions
5 MCU BOARD
Replace the MCU Board. Refer to the Printer Service Manual.
Check the Stapler function.
Does the Stapler function correctly?
6 The following Finisher FRUs and areas are associated with
this specific problem. One or more of these FRUs or areas may
have failed partially or completely. If you cannot isolate this
problem using these steps, replace each FRU or troubleshoot
each area listed below, one at a time, until you isolate and
solve the problem.
• Wiring and connectors linking the FRUs.
2-44
Service Manual
4025-Finisher
Yes No
Problem Go to step 6
solved