Samsung CLX-9252 Series Service Manual page 421

7.3.1 Vertical white band / Dark band
A. Typical faulty images A. Typical faulty images
B. Troubleshooting procedure
Step
1 A black line in sub scan direction is sha
2 2 A white line in sub scan direction is shar A white line in sub scan direction is shar
3 The surface of the OPC drum is scratche
4 Dirty on the outside.
5 5 Contact terminals make good connection Contact terminals make good connection
each imaging unit and machine.
6 Developing bias contact terminal makes
connection.
7 The surface of the LSU window is dirty.
8 8 The problem has been eliminated throug The problem has been eliminated throug
checks of steps up to 7.
Service Manual
7. Troubles
Vertical white bands
Check item
shooting
(in feeding direction)
Vertical color bands
rp. Clean the charge scorotron.
rp. rp Clean the LSU window Clean the LSU window
ed. Change imaging unit.
Clean.
n between n between Clean contact terminals Clean contact terminals.
good Clean contact terminal and check
terminal position.
Clean with cleaning jig.
h the h the Change LSU. Change LSU
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Action
To be continued on next page...
SAMSUNG ELECTRONICS