Lexmark W820 Service Manual page 123

Step Actions and Questions
10 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, one at a time, until you isolate
and solve the problem.
•
Wiring and connectors linking the FRUs
Error Code 251
There is a paper jam between Paper Tray 5 and the Tray 4 Take Away Sensor.
Logic Control on the MCU PWB sensed that when paper was fed from Tray 5, the Tray 4
Take Away Sensor did not actuate within the specified time after the Tray 5 Feed Clutch
was actuated.
Step Actions and Questions
1 Are all the feed rolls correctly installed? Go to
Nudger, Feeder, and Retard Rolls" on page
Feed, Nudger, and Retard Rolls" on page
Feed, Nudger, and Retard Rolls" on page
2 PAPER INSPECTION
Inspect the paper that is loaded in the paper cassette.
Is the paper loaded in the cassette wrinkled or damaged?
3 PAPER PATH INSPECTION
Inspect the paper path for paper scraps or foreign objects that
could cause a paper jam.
Is the paper path clear?
4 TRAY 5 LIFT MOTOR QUICK TEST
With printer power on, pull paper drawer 3 out to drop paper
table. Push drawer 5 closed. The paper tray motor should run.
Does Tray 5 lift motor run?
5 TRAY 5 FEED CLUTCH TEST
Enter Diagnostic Mode - Input Tray Tests to start the HCF
Motor, and to check the Tray 5 Feed Clutch function.
Select Tray 5 Single (feed on sheet).
Does the Tray 5 Feed Clutch actuate and the Feed Roll
shaft rotate?
4025 Options
"Tray 3
4-84, "Tray 4
4-96, and "Tray 5
4-104.
Yes No
Yes No
Go to step 2 Install
correctly or
replace as
necessary
Replace the Go to step 3
paper with
new paper
Go to step 4 Clear the
paper path
Go to step 5 Replace the
"Lift Motor"
on page 4-67
Go to step 6 Replace the
"Trays 3, 4,
and 5 Feed
Clutches" on
page 4-70
Diagnostic Information
2-41