Are any of the toner lights lit? Then the problem is you are out of that color toner and must replace it.
If the toner lights are off, then the printer has an error that must be corrected. Check for a paper jam, an open cover, no paper in the tray (or not being picked up by the rollers), the waste toner container being missing or full.
The other errors that could be at fault are service errors: LSU (laser unit) error, fuser error, or ITB
error. For these, you need to contact Samsung support for the part numbers. The fuser should last 100,000 pages. The ITB has an expected life of 60,000 black and white pages and 15,000 color pages. Samsung recommends these be replaced by a certified technician.
The unit will not print until the fault is fixed.
I hope this helps.
Cindy Wells
paper and red 
ink light flash alternately and green 
power light is off
possible problem:
Paper may be blocking movement of the print head. Turn off the printer, then open the cover and remove any jammed paper or other foreign objects. Turn the printer back on again. If the lights are still on, that means the printer is having a hardware issue
if:
Green power light is off; red paper and ink lights flash (quickly)
possible problem: The printer may have an internal error. Turn off the printer, wait a few seconds, and turn it on again. If the lights are still flashing , that means the printer is having a hardware issue
power light stops flashing) before you turn off the printer, or power light is still flashing after 5 minutes, turn off the printer. If the light is still flashing when you turn it back on, contact Epson. 1,087 views
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