Same problem here. I ended up calling Samsung support and, after being hung up on a couple of times, and transferred numerous other times, I managed to speak with someone who helped me through a few tests. He ended up sending me a new imaging unit. This is the main guts of the printer (when you open up the front panel and pull the green handle, the entire thing you're pulling out is the imaging unit). Since the unit was only 8 months old this new part was free (I think the warranty is a year). After installing this new part, the problem went away. :-)
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According to the service manual for problems with light print image, the cause can be the Developers or High Voltage Power Supply (HVPS). Other possible causes are given as: Developer roller is stained when the toner or developer cartridge is almost consumed. Ambient temperature is below 10 degrees Centigrade. Bad contacts with the HVPS or abnormal output from the HVPS. To replace the Developers you would need to purchase a replacement Imaging Kit CLP-R300A. Any problems in the HVPS would require a factory repair.
What do you mean that you get poor black printing? Is it faded on vertically, with one side of the page or or portions of the print faint? If so, the problem lies with the imaging unit, specifically the black developer blades. You can fix it by buying a new one. But eventually you need another one. This is the more expensive route. But, if you are handy you can clean it up yourself. If you look at my tips section, I have posted a detailed instructions to show you how you can do it yourself.
This is a very common problem with the Samsung CLP 300 and CLX 3160 printers. What happens is that the toner or developer blades become coated with toner. The developer blades meter the amount of toner that the printer uses to make the image on the paper. When the blade become blocked, the image become faint. To fix this problem, you and either replace the imaging unit for about $100 or you can clean the blades yourself. I have posted instructions how to clean them on my Tips section.