Lexmark W820 - Optra B/W Laser Printer Service Manual page 90

Step Actions and Questions
3 ENCODER ASSEMBLY
Replace the Encoder Assembly. Enter Diagnostics and check
the Stacker Tray Position 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 Docking Interlock Switch function.
Does the Interlock Switch test ok?
5 MCU BOARD
Replace the MCU Board. Refer to the Printer Service Manual.
Enter Diagnostics and check the Docking Interlock Switch
function.
Does the Interlock Switch test ok?
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
• Elevator Drive Unit
• Elevator Belt
• Stacker Tray
• Stacker Tray Paper Sensor
982 - Error Code Service Check
Logic control sensed that there is a problem at the Jogger Home F Sensor.
Step Actions and Questions
1 SENSOR TEST
Enter Diagnostics and check the Jogger Home F 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?
2-30
Service Manual
4025-Finisher
"PWB Assembly-
4-132. Enter Diagnostics and check
Yes No
Problem Go to step 4
solved
Problem Go to step 5
solved
Problem Go to step 6
solved
Yes No
Go to step 3 Go to step 2