Lexmark W820 Service Manual page 134

Attendance Message 204
The Fuser Exit Sensor is actuated at printer power on.
Logic Control on the MCU PWB sensed the Fuser Exit Sensor was on while the printer
was in standby.
Step Actions and Questions
1 SENSOR INSPECTION
Inspect the Fuser Exit Sensor for paper scraps that may have
actuated the Sensor or may have caused it to stick.
Is the Fuser Exit Sensor free of paper scraps?
2 FUSER EXIT SENSOR TEST
Enter Diagnostic Mode and select Fuser Exit Sensor.
Insert and then remove, a sheet of paper into the sensor.
Does the Operator Panel LCD change between OP and CL
as you insert then remove the paper?
3 MCU PWB REPLACEMENT
Replace the
Does the error code appear?
4 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 listed below, one at a time, until
you isolate and solve the problem.
• Wiring and connectors linking the FRUs
• I/O PWB - Go to
Attendance Message 206
There is a paper jam at the Face Up Exit Sensor.
Logic Control on the MCU PWB sensed that during Face-Down-Mode the Face Up Exit
Sensor did not deactuate within the specified time after the Sensor actuated.
Step Actions and Questions
1 PAPER TRAVEL INSPECTION
Remove the Fuser Full Cover.
Observe the position of the sheet of paper.
Did the sheet of paper stop on the Face Up Exit Sensor?
2-38
Service Manual
"Engine Board (MCU PWB)" on page 4-92
"I/O PWB" on page
4025-XXX
4-89.
Yes No
Go to step 2 Clear paper
from the
Sensor
Go to step 3 Replace the
"Face Up
Exit Sensor"
on page 4-77
Go to step 4 Problem
solved
Yes No
Go to step 3 Go to step 2