Lexmark W820 - Optra B/W Laser Printer Service Manual page 80

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
• H-Tra drive train FRUs, including gear, belts, and rolls.
287 - Attendance Message
Logic Control sensed that the H-Tra Input Sensor was not actuated within a specified time after the Fuser Exit
Sensor was deactuated.
Step Actions and Questions
1 PATH LOCATION INSPECTION
Inspect the position of the sheet of paper entering the H-Tra.
Has the lead edge of the sheet of paper actuated the H-Tra
Input Sensor?
2 H-TRA GATE SOLENOID TEST
Enter Diagnostics and check the H-Tra Gate Solenoid 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 GATE INSPECTION
Inspect the H-Tra Gate for damage.
Is the H-Tra Gate in good condition and does the H-Tra
Gate move when you actuate the H-Tra Gate Solenoid?
4 FINISHER MAIN BOARD
Replace the Finisher Main Board. Go to
Main Removal" on page
the H-Tra Gate Solenoid 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 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?
2-20
Service Manual
4025-Finisher
"PWB Assembly-
4-132. Enter Diagnostics and check
Yes No
Yes No
Go to step 5 Go to step 2
Go to step 3 Go to step 7
Go to step 4 Replace the
H-Tra Gate
Problem Replace the
solved MCU Board
Go to step 8 Go to step 6