Lexmark W820 - Optra B/W Laser Printer Service Manual page 94

985 - Error Code Service Check
Logic control sensed that the Shift Roller failed.
Step Actions and Questions
1 SENSOR TEST
Enter Diagnostics and check the Shift Roller HP Sensor
function. Insert then remove a sheet of paper into the sensor.
Does the Operator Panel LCD change between OP and CL
as you insert then remove the paper?
2 SHIFT ROLLER HP SENSOR
Replace the Shift Roller HP Sensor. Go to
Assembly Removal" on page
check the Shift Roller HP Sensor function. Insert then remove
a sheet of paper into the sensor.
Does the Operator Panel LCD change between OP and CL
as you insert then remove the paper?
3 MOTOR TEST
Enter Diagnostics and select Output Bin Tests. Select Feed
Test, Output Bin 2 to feed paper through the Finisher.
Does the Shift Motor test ok?
4 SHIFT MOTOR
Replace the Shift Motor. Go to
Removal" on page
Shift Motor function.
Does the Shift Motor test ok?
5 DRIVE TRAIN INSPECTION
Inspect the drive train, including belts, gears, and levers of the
entire Shift Roller Assembly.
Does the entire drive train of the Shift Roller assembly
appear to be in good condition, with no damaged or
slipping gears and no broken levers?
6 FINISHER MAIN BOARD
Replace the Finisher Main Board. Go to
Main Removal" on page
Output Bin Tests. Select Feed Test, Output Bin 2 to feed paper
through the Finisher.
Does the Sensor and/or Motor test ok?
7 MCU BOARD
Replace the MCU Board. Refer to the Printer Service Manual.
Enter Diagnostics and check the Shift Roller HP Sensor and/or
Shift Motor function.
Does the Sensor and/or Motor test ok?
2-34
Service Manual
4025-Finisher
"No Paper Sensor
4-136. Enter Diagnostics and
"Motor Assembly-MP2
4-77. Enter Diagnostics and check the
"PWB Assembly-
4-132. Enter Diagnostics and select
Yes No
Go to step 3 Go to step 2
Problem Go to step 6
solved
Go to step 5 Go to step 4
Problem Go to step 6
solved
Go to step 6 Replace the
damaged
FRUs
Problem Go to step 7
solved
Problem Go to step 8
solved