Lexmark W820 Service Manual page 96

Error Code 233
There is a problem with the Duplex Exit Sensor.
Logic Control on the MCU PWB sensed that the Duplex Exit Sensor was on while the
printer was in standby.
Step Actions and Questions
1 DUPLEX EXIT SENSOR INSPECTION
Inspect the Duplex Exit Sensor for contamination or paper
scraps that may be actuating the sensor.
Is the Duplex Exit Sensor clean and free of paper scraps?
2 DUPLEX EXIT SENSOR INSPECTION
Inspect the Duplex Exit Sensor for damage, such as a broken
spring or actuator, that may have locked the Sensor in the on
position.
Is the sensor undamaged?
3 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?
4 DUPLEX PWB REPLACEMENT
Replace the
Does the error code appear?
5 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?
6 I/O PWB REPLACEMENT
Replace the I/O 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
2-14
Service Manual
"Duplex PWB and Bracket" on page
4025 Options
4-7.
Yes No
Go to step 2 Clean or clear
paper scraps
from the
Sensor
Go to step 3 Replace the
"Duplex Exit
Sensor" on
page 4-10
Go to step 4 Replace the
"Duplex Exit
Sensor" on
page 4-10
Go to step 5 Problem
solved
Go to step 6 Problem
solved
Go to step 7 Problem
solved