Dell 2135cn Service Manual page 393

Step
Checking the PHD UNIT for connection
Remove the PHD UNIT.
Are five HV terminals on the PHD UNIT, and five springs on
the frame (PL4.1.10 and PL4.1.15 to 18) dirty and/or
deformed?
14
Checking after reseating the PHD UNIT
15 Reseat the PHD UNIT.
Is the image printed correctly?
Checking the laser beam windows of the ROS ASSY
Are the laser beam windows on the ROS ASSY clean?
16
Checking the laser beam path
Are there any foreign substances between the ROS ASSY
and PHD UNIT?
17
Version 1 2008.02.01
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Chapter 1 Troubleshooting
Remedy
Yes
Clean and/or
replace the PHD
UNIT or Go to step 15.
SPRING(s), then
go to step 15.
End of work. Go to step 16.
Clean the
window(s) with
Go to step 17.
soft cloth or cotton
swab gently.
Remove the
foreign Go to step 18.
substances.
No