Lexmark W820 Service Manual page 138

Step Actions and Questions
3 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?
4 MCU PWB REPLACEMENT
Replace the
Does the error code appear?
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 241
There is a paper jam between Paper Tray 1 and the Registration
Sensor.
Logic Control on the MCU PWB sensed that the Registration Sensor did not actuate
within the specified time after the Tray 1 Feed Clutch was actuated.
Step Actions and Questions
1 PAPER INSPECTION
Inspect the paper loaded in the paper cassette.
Is the paper wrinkled or damaged?
2 PAPER PATH INSPECTION
Inspect the paper path for paper scraps or foreign objects that
could cause a paper jam.
Is the paper path clear?
3 TRAY 1 LIFT MOTOR QUICK TEST
Turn printer off. Pull paper drawer 1 out to drop paper table.
Push drawer closed. Turn printer on. The paper tray motor
should run.
Does Tray 1 lift motor run?
2-42
Service Manual
"Engine Board (MCU PWB)" on page 4-92
"I/O PWB" on page
4025-XXX
4-89.
Yes No
Go to step 4 Replace the
"Face Up
Exit Sensor"
on page 4-77
Go to step 5 Problem
solved
Yes No
Replace the Go to step 2
paper with
new paper
Go to step 3 Clear the
paper path
Go to step 4 Replace the
"Tray 1 Lift
Motor" on
page 4-13