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This light is indeed designed to indicate a low toner condition. Its coming on is triggered not by the actual level of toner in the cartridge, but by a software process that estimates toner use. If you are inclined to refill your own cartridges, you can use install a glass fuse in the little clip on the back of the toner cartridge that will reset the counter, and turn out the light, otherwise the light will stay on. The reset process will blow the fuse, so a new fuse is needed each time a cartridge is refilled. Leaving the light lit does not hinder the operation of the printer, so as long as there is still sufficient toner to print, the printer will operate normally.
Maybe the toner is low... According to the manual, a blinking red light:
• A minor error is occurring and the printer is waiting for the error to be cleared. When the problem is cleared, the printer resumes printing. • The toner cartridge is low. Order a new toner cartridge. You can temporarily improve print quality by redistributing the toner. See page 8.3. • The toner is totally exhausted. Remove the old toner cartridge and install a new one. See page 8.4. • The toner cartridge reached the end of its life.
The cause of this is a faulty toner cartridge. What happened was some toner spilled out of the cartridge and down into your printer. Take the toner cartridge out and with a damp paper towel just goto town and wipe everything down.
Replace the toner cartridge, and in about 20 pages it should clear up.
I'm using remanufactured toner provided with my ML-2010 by Discount City when I purchased the printer and I'm having the same problem.
I have used non OEM toner in other laser printers also with disasterous consequnces so I think you'll have to 'bite the bullet' and purchase a new Samsung toner cartridge unless you can find out who manufactures the cartridge in which case you might be able to souece one directly avoiding the extorionate mark up.