Samsung SCX-472 series Service Manual page 111

5) Light image
Description : The printed image is light, with no ghost.
Check and cause
Toner cartridge life is expired.
HVPS terminal is contaminated.
The output from the HVPS is abnormal.
6) Dark or Black page
Description : The printed image is dark or black.
Check and cause
Check if the high voltage terminal is contaminated.
The charging roller is defective.
The output from the HVPS is abnormal.
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4. Alignment and Troubleshooting
Solution
Replace the toner cartridge.
Clean the contaminated terminal.
Replace the HVPS board.
Solution
Clean the high voltage terminal.
Replace the toner cartridge.
Replace the HVPS board.
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