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I have to ask this question of you, just to make sure this is not an issue.Are you using a factory new ink cartridge? Please consider the following: If you are using a refilled or third party cartridge that may well be your problem.Most manufacturers build logic into their products to prevent the use of “Other Equipment Manufactured” cartridges as well as re-filled cartridges. They do this to prevent problems from contaminated inks causing problems with print quality or damaging the physical printhead. If you are using factory new cartridges, then please call the manufacturers Technical Support for assistance with the warranty on the cartridges Don
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.
LSU means "Laser Scanner Unit". That is the part that actually "prints" the image on the drum before it goes to the paper. If the toner (not ink) cartridge is in good condition, then you need an Authorized Service Center to replace the LSU assembly.
All toner cartridges have a waste toner area where excess toner is stored, therefore appearing to be heavy. The 1450 will not ask for toner when depleted, and Samsung cartridges are cheaper than competing brands.
Sounds like your PCU is starting to fail. There is a cleaner roller that removes any remained toner and this could be shot.
Try replacing the PCU. If this makes no difference it could be the fuser though this si less likely.