Samsung SCX-472 series Service Manual page 112

4. Alignment and Troubleshooting
7) Uneven Density
Description : Print density is uneven between left and right.
Check and cause
The pressure force on the left and right springs of the
•
transfer roller is not even.
The springs are damaged.
•
The transfer roller is improperly installed.
•
The toner level is not even on the toner cartridge roller due
to the bad blade.
8) Background
Description : Light dark background appears in whole area of the printing.
Check and cause
Does recycle paper be used?
The life of the toner cartridge has been expired
The output from the HVPS is abnormal.
4-45
Solution
1) Remove the transfer roller Assy.
2) Check if the transfer roller Assy has any wrong part.
3) Replace the transfer roller Assy.
Replace the toner cartridge.
Solution
Use the proper papers.
Replace the toner cartridge.
Replace the HVPS board.
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