Dell 2135cn Service Manual page 446

Step
Checking after reseating the DRIVE ASSY SUB
Reseat the DRIVE ASSY SUB.
8 Does the noise arise from the printer?
Checked by [Digital Output]-[DO-05] of the [IOT Diag] on the
[Printer] of the diagnosis.
Version 1 2008.02.01
Check
1 - 418
Chapter 1 Troubleshooting
Remedy
Yes
Try replacing the
PHD UNIT (refer
to Removal 3/
Replacement 57),
FUSER ASSY
(refer to Removal
End of work.
9/ Replacement
51) and DRIVE
ASSY SUB (refer
to Removal 34/
Replacement 26)
one after another.
No