Lexmark W820 - Optra B/W Laser Printer Service Manual page 73

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 components
Finisher Main Board
MCU Board
281 - Attendance Message
Logic Control sensed that the H-Tra Input Sensor was actuated during Finisher initialization.
Step Actions and Questions
1 SENSOR INSPECTION
Inspect the H-Tra Input Sensor for a piece of paper or
something else actuating the Sensor.
Is there a piece of paper or something else actuating the
Sensor?
2 SENSOR TEST
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?
3 H-TRA INPUT SENSOR
Replace the H-Tra Input Sensor. Go to
on page 4-20. 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?
4 FINISHER MAIN BOARD
Replace the Finisher Main Board. Go to
Main Removal" on page
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?
4025-Finisher
"Sensors Removal"
"PWB Assembly-
4-132. Enter Diagnostics and check
Yes No
Yes No
Remove Go to step 2
whatever is
actuating the
Sensor
Go to step 4 Go to step 3
Problem Go to step 4
solved
Problem Go to step 5
solved
Diagnostic Information
2-13