Samsung SCX4521F Service Manual - Page 114
Uneven Density, Background
UPC - 635753616040
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Troubleshooting 6.5.7 Uneven Density • Description Print density is uneven between left and right. Check and Cause 1. 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, or the transfer roller bushing or holder is damaged. 2. The toner level is not even on the developer roller due to the bad blade. Solution 1. Replace both the left and right Spring Holder. 2. Occur in the developer cartridge, replace the developer and try to print out. 6.5.8 Background • Description Light dark background appears in whole area of the printing. Digital Printer Digital Printer Digital Printer Digital Printer Digital Printer Check and Cause 1. Does character exist less than 2% per a page, and hasn't it been used long time? 2. Does recycle paper be used? 3. Has the life span of the developer ended? 4. Is the movement(Up and Down) of the transfer roller smooth? 5. Is the HVPS normal? Solution 1. The toner cartridge is basically designed to print 3,000 sheets with 5% image. 2. The B/S is not guaranteed if using recycle paper. 3. Replace the developer when the life span of it has been ended. 4. Clean the bushing part of the transfer roller. 5. If the problem is still not solved, replace the developer. Samsung Electronics Service Manual 6-19