Lexmark W820 Service Manual page 131

Step Actions and Questions
3 TRAY 3 NO PAPER 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?
4 HCF PWB REPLACEMENT
Replace the "HCF PWB" on page
Does the error code appear?
5 I/O PWB REPLACEMENT
Replace the I/O PWB.
Does the error code appear?
6 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?
7 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 944
There is a problem with Tray 4.
Logic Control on the MCU PWB sensed that the Tray 4 Paper Level Sensor did not
actuate within the specified time after the Tray 4 Lift Motor was actuated.
Step Actions and Questions
1 TRAY 4 LIFT MOTOR TEST
With printer power on, pull paper drawer 4 out to drop the
paper table. Push drawer 4 closed. The paper tray motor
should run.
Does Tray 4 lift motor run?
2 TRAY 4 CHECK
Slowly slide Tray 4 out of Feeder 4.
Does the Tray 4 bottom plate drop as you slide the Tray
out of the Feeder?
4025 Options
4-66.
Yes No
Go to step 4 Replace the
"Trays 3, 4,
and 5 No
Paper
Sensors" on
page 4-73
Go to step 5 Problem
solved
Go to step 6 Problem
solved
Go to step 7 Problem
solved
Yes No
Go to step 2 Replace Tray
4 Lift Motor.
Go to
Motor" on
page 4-67
Go to step 3 Replace
"HCF Tray 4"
on page 4-86
Diagnostic Information
"Lift
2-49