Lexmark W820 - Optra B/W Laser Printer Service Manual page 76

Step Actions and Questions
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 PATH PAPER INSPECTION
Inspect the Drive Rolls in the entire H-Tra Assembly.
Are all of the Drive Rolls in the H-Tra Assembly clean and
free of obvious wear and damage?
6 DRIVE TRAIN TEST
Enter Diagnostics and select Output Bin Tests. Select Feed
Test, Output Bin 2 to run the Finisher Main Feed Motor.
Does the Finisher Main Feed Motor run smoothly?
7 DRIVE TRAIN INSPECTION
Inspect the drive train, including belts, pulleys, and gears, of
the entire H-Tra Assembly from the Finisher Main Feed Motor
to Feed Roller 1.
Does the entire drive train of the H-Tra Assembly appear
to be in good condition, with no damaged or slipping belts
and no chipped or broken pulleys or gears?
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
284 - Attendance Message
Logic Control sensed that the H-Tra Exit Sensor was actuated during Finisher initialization.
Step Actions and Questions
1 SENSOR INSPECTION
Inspect the H-Tra Exit Sensor for a piece of paper or something
else actuating the Sensor.
Is there a piece of paper or something else actuating the
Sensor?
2-16
Service Manual
4025-Finisher
"PWB Assembly-
4-132. Enter Diagnostics and check
Yes No
Problem Replace the
solved
MCU Board
Go to step 6 Replace the
suspect Drive
Rolls
Go to step 7 Replace the
Finisher Main
Feed Motor
Go to step 8 Replace the
suspect belts,
pulleys, and
gears
Yes No
Remove Go to step 2
whatever is
actuating the
Sensor