Lexmark W820 Service Manual page 92

Step Actions and Questions
1 PAPER INSPECTION
Inspect the paper that is loaded in the paper cassette.
Is the paper that is loaded in the cassette wrinkled or
damaged?
2 PAPER PATH INSPECTION
Open the Duplex Unit and inspect the paper path between the
Fuser and the Duplex for paper scraps or foreign objects that
could cause a paper jam.
Is the paper path clear?
3 FACE UP EXIT SENSOR TEST
Enter Diagnostic Mode and select Face Up Exit Sensor.
Insert, then remove, a sheet of paper into the Face Up Exit
Sensor
Does the Control Panel LCD change between OP and CL
as you insert then remove the paper?
4 DUPLEX UNIT EXIT SENSOR TEST
Enter Diagnostic Mode, select Duplex Exit Sensor.
Insert, then remove, a sheet of paper into the Duplex Exit
Sensor.
Does the Control Panel LCD change between OP and CL
as you insert then remove the paper?
5 INVERTER CLUTCH TEST
Enter Diagnostic Mode, select Duplex Quick Test.
You can see and hear the clutch "pick" (energize). The Exit Roll
shaft rotates when the clutch engages.
Does the Wait Clutch actuate and does the Exit Roll rotate
during the Quick Test?
6 DUPLEX EXIT GATE SOLENOID TEST
Enter Diagnostic Mode, select Duplex Quick Test.
With the Duplex top cover removed, you can see the Exit Gate
solenoid "pick" (energize) during the Quick Test.
Does the Exit Gate Solenoid toggle the Exit Gate during
the Quick Test?
2-10
Service Manual
4025 Options
Yes No
Replace the Go to step 2
paper with
new paper
Go to step 3 Clear the
paper path
Go to step 4 Replace the
Face Up Exit
Sensor. Go to
the printer
service
manual for the
Removal and
Replacement
Procedure.
Go to step 5 Replace the
"Duplex Exit
Sensor" on
page 4-10)
Go to step 6 Replace the
Exit Drive
Assembly. Go
to the printer
service
manual for the
Removal and
Replacement
Procedure.
Go to step 7 Replace the
"Duplex Exit
Gate
Solenoid" on
page 4-11