Lexmark W820 Service Manual page 119

Step Actions and Questions
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 4 LIFT MOTOR QUICK TEST
With printer power on, pull paper drawer 3 out to drop paper
table. Push drawer 4 closed. The paper tray motor should run.
Does Tray 4 lift motor run?
5 TRAY 4 FEED CLUTCH TEST
Enter Diagnostic Mode - Input Tray Tests to start the HCF
Motor, and to check the Tray 4 Feed Clutch function.
Select Tray 4 Single (feed on sheet).
Does the Tray 4 Feed Clutch actuate and the Feed Roll
shaft rotate?
6 FEED, NUDGER, AND RETARD ROLL CHECK
After performing step 4, open the Left Upper Cover of the HCF.
Was a sheet of paper fed out of the tray?
7 TRAY 3 TAKE AWAY SENSOR TEST
Enter Diagnostic Mode, Base Sensors - Tray 3 Take Away
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?
8 HCF PWB REPLACEMENT
Replace the "HCF PWB" on page
Does the error code appear?
9 I/O PWB REPLACEMENT
Replace the I/O PWB.
Does the error code appear?
10 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
4-66.
Yes No
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
Go to step 7 Replace the
"Tray 4
Feeder
Assembly"
on page 4-92
Go to step 8 Replace the
"Tray 3 Take
Away
Sensor" on
page 4-78
Go to step 9 Problem
solved
Go to step 10 Problem
solved
Go to step 11 Problem
solved
Diagnostic Information
2-37