Lexmark W820 - Optra B/W Laser Printer Service Manual page 74

Step Actions and Questions
5 MCU BOARD
Replace the MCU Board. Refer to the Printer Service Manual.
Enter Diagnostics and check the H-Tra Input 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
282 - Attendance Message
Logic Control sensed that the H-Tra Exit Sensor was not deactuated within a specified time after it was
actuated.
Step Actions and Questions
1 PATH LOCATION INSPECTION
Inspect the position of the sheet of paper exiting the H-Tra Exit
Sensor.
Has the trail edge of the sheet of paper cleared the H-Tra
Exit Sensor?
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?
2-14
Service Manual
4025-Finisher
"Sensors Removal" on
"PWB Assembly-
4-132. Enter Diagnostics and check
Yes No
Problem Go to step 6
solved
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