Lexmark C920 - Color Drum Sensor Error; Black Drum Sensor Error; Cassette Error

Diagnostic information 2-15
5056-XXX
934 - Color Drum Sensor Error
935 - Black Drum Sensor Error
936 - 939 Cassette Error
934 Service
Drum Sensor
Step Questions/actions Yes No
1 Clean the color drum sensor LED.
Did this fix the problem?
Problem solved. Go to step 2
2
Swap the yellow photo developer with a different color
photo developer. Did this fix the problem?
Replace the
photo developer
that called the
error.
Go to step 3.
3
Is connector CN2 on the printer controller board
connected properly?
Replace the sub
frame assembly.
Plug the
connector in
securely.
4
Did replacing the sub frame fix the problem? Problem solved. Replace the
printer controller
board.
Step Questions/actions Yes No
1 Clean the black drum sensor LED.
Did this fix the problem?
Problem solved. Go to step 2
2
Swap the black photo developer with a different color
photo developer. Did this fix the problem?
Replace the
photo developer
that called the
error.
Go to step 3.
3
Is connector CN2 on the printer controller board
connected properly?
Replace the sub
frame assembly.
Plug the
connector in
securely.
4
Did replacing the sub frame fix the problem? Problem solved. Replace the
printer controller
board.
936 Service
Paper Option
Step Questions/actions Yes No
1 Are connectors CN8 and CN6 on the printer controller
board connected properly?
Replace the
printer controller
board.
Plug the
connector in
securely.