Lexmark W820 Service Manual page 149

Attendance Message - Close Door B
The Left Lower Cover is open.
The Left Lower Cover is closed, but Logic Control on the MCU PWB sensed the Left
Lower Cover Interlock Switch is open.
Step Actions and Questions
1 LEFT LOWER COVER CHECK
Open and close the Left Lower Cover.
Is the error code cleared?
2 LEFT LOWER COVER INTERLOCK SWITCH INSPECTION
Inspect the Left Lower Cover Interlock Switch for damage.
Is the switch damaged?
3 LEFT LOWER COVER INTERLOCK ACTUATOR
INSPECTION
Inspect the Left Lower Cover Interlock Actuator for damage
that may prevent the Cover from actuating the Interlock when
the Cover is closed.
Is the Interlock Actuator damaged?
4 LEFT LOWER COVER INTERLOCK SWITCH TEST
Enter Diagnostic Mode, Base Sensor Test.
Actuate and deactuate the Left Cover Interlock Switch.
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
4025-XXX
"I/O PWB" on page 4-89.
Yes
Problem
solved
Replace the
"Left Lower
Cover
Interlock
Switch" on
page 4-49
Replace the
"Left Lower
Cover
Assembly"
on page 4-46
Replace the
"Left Lower
Cover
Interlock
Switch" on
page 4-49
Go to step 6
4-92.
Diagnostic Information
No
Go to step 2
Go to step 3
Go to step 4
Go to step 5
Problem
solved
2-53