Lexmark W820 Service Manual page 99

Step Actions and Questions
6 I/O PWB REPLACEMENT
Replace the I/O PWB. Go to the printer service manual for the
Removal and Replacement Procedure.
Does the error code appear?
7 The following printer 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 the steps in this service check, replace each
FRU or troubleshoot each area, one at a time, until you isolate
and solve the problem.
•
Wiring and connectors linking the FRUs
Error Code 997
Logic control sensed that the installed Duplex is not compatible with the printer.
Step Actions and Questions
1 DUPLEX INSPECTION
Inspect the Duplex Unit to make sure it is the correct
manufacture and model for the printer.
Is the Duplex Unit the correct manufacture and model for
this printer?
2 RESET
Turn off the printer. Wait one minute, then turn on the printer.
Is the error code gone?
3 RESEAT
Disconnect then reconnect the Duplex from the printer.
Is the error code gone?
4 DUPLEX PWB
Replace the "Duplex PWB and Bracket" on page
Is the error code gone?
5 MCU BOARD
Replace the printer Engine Board (MCU PWB). Go to the
Printer Service Manual for the Removal and Replacement
Procedure.
Is the error code gone?
4025 Options
4-7.
Yes No
Go to step 7 Problem
solved
Yes No
Go to step 2 Replace the
Duplex Unit
with a correct
one
Problem Go to step 3
solved
Problem Go to step 4
solved
Problem Go to step 5
solved
Problem Go to step 6
solved
Diagnostic Information
2-17