Lexmark W820 - Optra B/W Laser Printer Service Manual page 77

Step Actions and Questions
2 SENSOR TEST
Enter Diagnostics and check the H-Tra Exit 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 H-TRA EXIT SENSOR
Replace the H-Tra Exit Sensor. Go to
page 4-20. Enter Diagnostics and check the H-Tra Exit 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 H-Tra Exit 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 MCU BOARD
Replace the MCU Board. Refer to the Printer Service Manual.
Enter Diagnostics and check the H-Tra Exit 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?
6 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
285 - Attendance Message
Logic Control sensed that the Finisher Input Path Sensor was not deactuated within a specified time after the
Finisher Input Path Sensor was actuated.
Step Actions and Questions
1 PATH LOCATION INSPECTION
Inspect the position of the sheet of paper exiting the Finisher
Input Path Sensor.
Has the trail edge of the sheet of paper cleared the
Finisher Input Path Sensor?
4025-Finisher
"Sensors Removal" on
"PWB Assembly-
4-132. Enter Diagnostics and check
Yes No
Go to step 4 Go to step 3
Problem Go to step 4
solved
Problem Go to step 5
solved
Problem Go to step 6
solved
Yes No
Go to step 2 Go to step 5
Diagnostic Information
2-17