Error Code 993 And 994 - Lexmark W820 Service Manual

Step Actions and Questions
3 TRAY 5 NO PAPER SENSOR TEST
Enter Diagnostic Mode, Base Sensors - Tray 5 Empty.
Push the sensor flag up and then release.
Does the Control Panel LCD change between OP and CL
as you move the sensor flag?
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 993 and 994

Logic control sensed that the installed High Capacity Feeder is not compatible with the
printer.
Step Actions and Questions
1 HIGH CAPACITY FEEDER INSPECTION
Inspect the High Capacity Feeder to make sure it is the correct
manufacture and model for the printer.
Is the High Capacity Feeder the correct manufacture and
model for this printer?
2 RESET
Turn off the printer. Wait one minute, then turn on the printer.
Is the error code gone?
4025 Options
4-66.
Yes No
Go to step 4 Replace the
Tray 5 No
Paper Sensor.
Go to "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 the
High Capacity
Feeder with a
correct one
Problem Go to step 3
solved
Diagnostic Information
2-51