Lexmark W820 Service Manual page 141

Step Actions and Questions
3 TAKE AWAY ROLL CHECK
Enter Diagnostic Mode - Input Tray Test, tray 2.
Remove Tray 1 to observe Tray 2 Take Away Roll rotation.
There is a small cutout just above the tray 2 Take Away Roll
that can be used to observe roll rotation.
Press Single to run a single sheet.
Does the Take Away Roll rotate during the run cycle?
4 REGISTRATION SENSOR TEST
Enter Diagnostic Mode and select Registration Sensor.
Open the Left Upper Cover.
Insert and then remove, a sheet of paper into the Registration
Sensor.
Does the Operator Panel LCD change between OP and CL
as you insert then remove the paper?
5 MCU PWB REPLACEMENT
Replace the "Engine Board (MCU PWB)" on page
Does the error code appear?
6 The following printer 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 the steps in this Service Check, 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
• I/O PWB - Go to
Attendance Message 256
There is problem with the Tray 2 Take Away Sensor.
Logic Control on the MCU PWB sensed the Tray 2 Take Away was on while the printer
was in standby.
Step Actions and Questions
1 TRAY 2 TAKE AWAY SENSOR INSPECTION
Inspect the Tray 2 Take Away Sensor for contamination or
paper scraps that may have actuated the sensor.
Is the Sensor clean and free of paper scraps?
4025-XXX
"I/O PWB" on page 4-89.
Yes
Go to step 4
Go to step 5
Go to step 6
4-92.
Yes
Go to step 2
Diagnostic Information
No
Replace the
"Tray 2
Feeder
Assembly"
on page 4-36
Replace the
"Registration
Sensor" on
page 4-56
Problem
solved
No
Clean or clear
paper scraps
from the
Sensor
2-45