Lexmark W820 Service Manual page 139

Step Actions and Questions
4 TRAY 1 FEED CLUTCH TEST
Remove the printer rear cover to observe the paper feed
during a print cycle. Enter Diagnostic Mode - Input Tray Test,
Tray 1, Single print.
Does the Tray 1 Feed Clutch actuate during the run cycle?
5 FEED, NUDGER, AND RETARD ROLL CHECK
After performing step 4, open the Left Upper Cover.
Was a sheet of paper fed into the Registration area?
6 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?
7 MCU PWB REPLACEMENT
Replace the "Engine Board (MCU PWB)" on page
Does the error code appear?
8 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 242
There is a paper jam between Paper Tray 2 and the Registration
Sensor.
Logic Control on the MCU PWB sensed that the Registration Sensor did not actuate
within the specified time after the Tray 2 Feed Clutch was actuated.
Step Actions and Questions
1 PAPER INSPECTION
Inspect the paper loaded in the paper cassette.
Is the paper wrinkled or damaged?
2 PAPER PATH INSPECTION
Inspect the paper path for paper scraps or foreign objects that
could cause a paper jam.
Is the paper path clear?
4025-XXX
"I/O PWB" on page 4-89.
Yes
Go to step 5
Go to step 6
Go to step 7
Go to step 8
4-92.
Yes
Replace the
paper with
new paper
Go to step 3
Diagnostic Information
No
Replace the
"Tray 1 Feed
Clutch" on
page 4-14
Replace the
"Tray 1 Feed
Rolls" on
page 4-16
Replace the
"Registration
Sensor" on
page 4-56
Problem
solved
No
Go to step 2
Clear the
paper path
2-43