Lexmark W820 - Optra B/W Laser Printer Service Manual page 82

Step Actions and Questions
3 FINISHER PATH SENSOR
Replace the Finisher Path Sensor. Go to
Removal" on page
Finisher Path 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 Finisher Path 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 Finisher, especially the Input
Rolls and the Registration Rolls.
Are all of the Drive Rolls in the Finisher 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 Finisher Assembly from the Finisher Main Feed
Motor to the Registration Rolls.
Does the entire drive train of the Finisher 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
2-22
Service Manual
4025-Finisher
"Sensor, Input Path
4-41. Enter Diagnostics and check the
"PWB Assembly-
4-132. Enter Diagnostics and check
Yes No
Problem Go to step 4
solved
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