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1-4-4 Image formation problems
Isolate the component an image defect has occurred from.
<A guide to isolate the component of the cause.>
Print a test page and check whether an image defect happens.
(System Menu > Adjustment/Maintenance > Service setting)
YES: Main unit as the cause of defect
NO: Scanner as the cause of defect
Perform enlarged or reduced copying and verify if the defective images are enlarged or reduced, accordingly.
YES: Scanner as the cause of defect
1. Scanner as the cause of defect:
If the defect occurs with copying or sending, refer to P.1-4-45.
(Defects caused by a reading error that occurs at the original (glass) LED lamp to CCD.)
Isolate the problem at the location that the originals are scanned.
a. DP (read by CCD)
b. On the contact glass (read by CCD)
2. Main unit as the cause of defect: refer to P. 1-4-45.
(A defect of image forming occurs from the rendering process that involves charging, drum, LSU,
developer, and primary transferring.)
<Flow of image data>
Copying :
LED lamp
Sending :
LED lamp
Printing data from PC :
Printer driver
Service Manual
Control PWB
CCD
ControlPWB
CCD
Control PWB
1-4-44
APC PWB
(LSU)
PC
APC PWB
(LSU)
Y116540-5
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