Dell 3110cn Service Manual page 205

Yes
Try replacing the DUPLEX
ASSY. (Removal 5/
Replacement 41)
Try replacing the DUPLEX
ASSY. (Removal 5/
Replacement 41)
Version 1 2006.02.25
Yes
Checking the DUPLEX
ASSY installation
Reseat the DUPLEX
ASSY.
Does the noise arise
from the printer?
Checking the Duplex Motor
arise from the printer?
Yes
Checked by [Digital
Output]-[DO-13] in [IOT
A
Checking the Duplex
Does the noise arise
when feeding the paper
from the Duplex?
Yes
B
No
Does the noise
No
Diagnosis].
Chapter 1 Troubleshooting
No
Checking the FUSER
ASSY installation
Reseat the FUSER ASSY.
Does the noise arise
from the printer?
END
No
END