Lexmark W820 Service Manual page 103

Step Actions and Questions
3 MAILBOX INPUT SENSOR TEST
Enter Diagnostic Mode - MBX Input Sensor
Insert, then remove, a sheet of paper into the Sensor.
Does the Control Panel LCD change between OP and CL
as you insert then remove the paper?
4 MAILBOX CONTROL PWB REPLACEMENT
Replace the "Mailbox Control PWB" on page
Does the error code appear?
5 IN GATE OBSERVATION
When performing step 2, did the paper travel under the IN
Gate and never enter the Mailbox?
6 IN GATE SOLENOID TEST
Enter Diagnostic Mode - Output Bin Feed Test.
Select single bin to feed one sheet of paper to one bin.
Does the In Gate open to guide paper into the Mailbox?
7 MAILBOX CONTROL PWB REPLACEMENT
Replace the "Mailbox Control PWB" on page
Does the error code appear?
8 MCU PWB REPLACEMENT
Replace the printer Engine Board (MCU PWB). Go to the
printer service manual for the Removal and Replacement
Procedure.
Does the error code appear?
4025 Options
4-44.
4-44.
Yes No
Go to step 4 Replace the
"Mailbox
Entrance
Sensor" on
page 4-39
Replace the Problem
MCU PWB solved
Go to the
printer service
manual for the
Removal and
Replacement
Procedure.
Go to step 6 Go to step 8
Go to step 7 Replace the
"IN Gate
Solenoid" on
page 4-40
reset the IN
Gate Solenoid
plunger in the
IN Gate Link
Go to step 8 Problem
solved
Go to step 9 Reinstall the
Exit Gate and
Spring or
replace the
Exit Gate and
Spring. Go to
the printer
service
manual for the
Removal and
Replacement
Procedure.
Diagnostic Information
or
2-21