Lexmark W820 Service Manual page 148

Attendance Message - Close Door A
The Left Cover is open.
The Left Cover is closed, but Logic Control on the MCU PWB sensed the Left Cover
Interlock Switch indicates the Cover is open.
Step Actions and Questions
1 LEFT COVER CHECK
Open and close the Left Cover.
Does the error code appear?
2 LEFT COVER INTERLOCK SWITCH INSPECTION
Remove the Rear Cover.
Inspect the Left Cover Interlock Switch for damage, such as a
broken or missing spring or a broken switch button.
Is the switch undamaged?
3 LEFT UPPER COVER INTERLOCK ACTUATOR
INSPECTION
Open and close the Left Upper Cover while observing the
action of the Left Upper Cover Actuator against the Interlock
Switch Spring.
Is the Left Cover Interlock Actuator pressing against the
Interlock Switch Spring?
4 LEFT 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
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
2-52
Service Manual
"Engine Board (MCU PWB)" on page 4-92
"I/O PWB" on page
4025-XXX
4-89.
Yes No
Tighten the Go to step 2
Switch
Bracket screw
Go to step 3 Replace the
"Left Lower
Cover
Interlock
Switch" on
page 4-49
Go to step 4 Replace the
"Left Upper
Cover
Assembly"
on page 4-52
Go to step 5 Replace the
"Left Cover
Interlock
Switch
Assembly"
on page 4-90
Go to step 6 Problem
solved