Red paper light blinking

Red blinking could indicate out of paper or out of toner. Be sure to check which light is blinking; the one for lack of toner or paper.

Check whether the paper tray has any paper and if it has, is it properly closed? Check whether it has a paper jam also.

Check the toner cartridge and ascertain whether it has anything. Lastly open the top cover and close it again for the printer to re-initiate itself.

I had the misfortune of between two sheets of paper, out of the packet, there was a piece of tape that jammed the drum.
Nothing else for it with your, take the drum and toner out and check for bits of paper.

Does one of these situations apply to you?

The Status LED light is Red and the Toner lights are OFF (Check Smart Panel for message)

• A Paper Jam has occurred.
• The Front, Top, or Back Cover is open.
• There is no paper in the Paper Tray.
• There is a problem with the Waste Toner container.
• A major error has occured.

The Status LED light is Blinking/Flashing Red and the Toner light(s) are Red

• The Toner cartridge(s) that are Red need to be replaced. (Can still be used to print, but quality is unreliable)

The Status LED light is Red and the Toner light(s) are Red

• The Toner cartridge(s) that are Red need to be replaced. (Printing is not available)
• The Toner cartridge(s) are not installed properly.

Source: samsung troubleshooting guide for CLP-315

samsung ml1640 laser red and green light blinking continuously and printing not happening

There are actually some certain meaning on the red light and green light showing different information to user. The summaries are:
1) Green On, Red Off = Printer Ready.
2) Green Fast-Flashing, Red Fast-Flashing = Printer warm up.
3) Green Fast-Flashing, Red Off = Printer off-line.
4) Green Slow-Flashing, Red Off = Processing Data.
5) Green Off, Red On = Cover Opened, Toner Empty or Developer Unit / Drum unit missing.
6) Green Off, Red Fast-Flashing = Paper Jam or waiting for jam reset.
7) Green Off, Red Slow-Flashing = Paper Empty or Paper tray is not inserted.
8) Green Off, Red Off = Printer power is off.
9) Green Very-Slow-Flashing, Red Off = Printer in sleep mode.
10) Green (any condition above), Red Slow-Flashing = Toner low or paper empty.

So what is your printer condition? Better know what is going on your printer so can solve the problem.

The following conditions can cause the On Line LED to glow:

* Printer paper is jammed inside your printer.
* A cover is not be closed properly.
* The toner cartridge is not inserted properly and needs to be reinstalled.
* The toner cartridge is running low.
* There is no paper in the paper tray.
* The paper inside the paper tray is not be installed correctly.

Red Error Light Blinks

If your printer's On Line LED is blinking red, your printer's toner is exhausted and needs to be replaced. For replacement cartridges, please click here to visit our official online parts distributor.
On Line and Error Light Blink Simultaneously

If your printer's On Line and Toner Save LEDs blink simultaneously, your printer requires service

Red Error Light Stays On The following conditions can cause the On Line LED to glow solid red:

• Printer paper is jammed inside your printer.
• A cover is not be closed properly.
• The toner cartridge is not inserted properly and needs to be reinstalled.
• The toner cartridge is running low.
• There is no paper in the paper tray.
• The paper inside the paper tray is not be installed correctly.

Red Error Light Blinks If your printer's On Line LED is blinking red, your printer's toner is exhausted and needs to be replaced. On Line and Error Light Blink Simultaneously
If your printer's On Line and Toner Save LEDs blink simultaneously, your printer requires service.

You can go to samsung online service request http://www.samsung.com/us/support/repaironline/supportOnlineServiceRequest.do

LED pattern Possible Problems and Solutions
Your system has some problems. If this problem occurs,
contact your service representative.
On Line/Error LED
lights red
• Paper jam occurs. To solve the problem, see “Clearing
Paper Jams” on page 5.6.
• The front cover is open. Close the front cover.
• Paper tray is empty. Load the paper in the Tray.
• The toner cartridge is out of toner. Remove the old toner
cartridge and install a new one. See “Installing the Toner
Cartridge” on page 2.4.
• You pressed the Cancel button while the printer is
receiving data.
• In Manual Feed mode, there is no paper in the manual
tray. Load paper into the manual tray.
• If the printer is receiving data, the On Line/Error LED
slowly blinks green.
• If the printer is printing the received data, the On Line/
Error LED blinks green fast.

If you turn off the printer and turn it back on, do you get any noises, ie motor noises, or does it instantly go to all lights flashing?
If you get no noises this usually indicates a board fault and you should look for a new printer.

I had this problem. The cancel button was stucked. Open the toner tray and slighly push the button side top-cover up. It released the cancel button for me (actually I was trying to open the top, but it worked). The cancel button was released and the blinking red-green stopped. Printer now working.