Lexmark W820 - Optra B/W Laser Printer Service Manual page 84

Step Actions and Questions
8 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
290 - Attendance Message
Logic Control sensed that the Finisher Exit Path Sensor did not deactuate within the specified time after it was
actuated.
Step Actions and Questions
1 PATH LOCATION INSPECTION
Inspect the position of the sheet of paper in the Finisher.
Has the trail edge of the sheet of paper cleared the
Finisher Exit Path Sensor?
2 SENSOR TEST
Enter Diagnostics and check the Finisher Exit Path Sensor
function. Insert 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 FINISHER EXIT PATH SENSOR
Replace the Finisher Exit Path Sensor. Go to
Path Removal" on page
the Finisher Exit Path Sensor function. Insert 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?
4 FINISHER MAIN BOARD
Replace the Finisher Main Board. Go to
Main Removal" on page
the Finisher Exit Path Sensor function.Insert 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?
5 PATH PAPER INSPECTION
Inspect the Drive Rolls in the Finisher, especially the
Registration Rolls, Shift Rolls, and Exit Rolls.
Are all of the Drive Rolls in the Finisher clean and free of
obvious wear and damage?
2-24
Service Manual
4025-Finisher
"Sensor, Input
4-41. Enter Diagnostics and check
"PWB Assembly-
4-132. Enter Diagnostics and check
Yes No
Yes No
Go to step 2 Go to step 5
Go to step 4 Go to step 3
Problem Go to step 4
solved
Problem Replace the
solved MCU Board
Go to step 6 Replace the
suspect Drive
Rolls