Lexmark W820 Service Manual page 136

Step Actions and Questions
3 PAPER FEED TEST
Enter Diagnostic Mode and select Duplex Quick Test.
The Face Up Clutch and the Exit Gate Solenoid should
operate.
Do the Offset Rollers rotate? Does the Exit Gate Solenoid
actuate during the Quick Test?
4 DUPLEX UNIT INSPECTION
Examine the Duplex Unit operation.
Is the Duplex Unit functioning correctly, and the rollers
feeding paper from the Offset Unit into the Duplex Unit?
5 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 209
There is a problem near the Fuser Exit Sensor.
Logic Control on the MCU PWB detected that the Fuser Exit Sensor did not actuate
within the specified time after the Fuser Entrance Sensor was actuated.
Step Actions and Questions
1 DUPLEX UNIT INSPECTION
Examine the Duplex Unit operation.
Is the Duplex Unit functioning correctly, and the rollers
feeding paper from the Offset Unit into the Duplex Unit?
2 FACE UP EXIT SENSOR TEST
Enter Diagnostic Mode and select Face Up Exit Sensor.
Insert and then remove, a sheet of paper into the Face Up Exit
Sensor
Does the Operator Panel LCD change between OP and CL
as you insert then remove the paper?
2-40
Service Manual
4025-XXX
"I/O PWB" on page 4-89.
Yes No
Go to step 4 Replace the
"Offset/Exit
Assembly"
on page 4-69
Treat problem Go to the
as intermittent Options
or go to step 5 Service
Manual and
troubleshoot
the problem
Yes No
Go to step 2 Go to the
Options
Service
Manual and
troubleshoot
the problem
Replace the Replace the
"Engine "Face Up
Board (MCU Exit Sensor"
PWB)" on on page 4-77
page 4-92