Red and green light blinking

Do a factory reset on the printer.

Check you printer driver settings if you are printing using it.

Clear the print que. Sounds like you have a print job in the que that has a European paper size. Example A4. U.S.A. useS 8.5x11 or letter or letter (r)

The lights continually flashing indicate a paper jam or the printer being out of ink. Check/clear any paper jam and verify the ink cartidge is set correctly.

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

The green light is the power light, the red light indicates out of paper or an empty ink cartridge.

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 printer does a longer green flash and then the amber flashes. you need to tell me how many flashes between the green flashes, to know what the problem is.

dear sir

1. it is problem paper miss feed
2. over temparature

clean thermostator.thermostator over dry toner
or cartridge assembling problem

1: Is it a TLP2844 or a TLP2844Z.

Operationally they are completely different printers. TLP2844 uses ELP (Eltron Programming Language. but TLP2844Z uses ZPL (Zebra Programming Language). You need to calibrate the printer to the labels.

Calibration:
If its a TLP2844. Load media. Connect power.
Hold down feed key, power on, count one, two, release feed key. The printer will go through a calibtation routine and print config label. IMPORTANT - When it prints this label you must press the feed key and see the message OUT OF DUMP. Your printer will now be calibrated. Check this by hitting the feed key a few times and printer will feed one label each time feed is hit.

Calibration:
If its a TLP2844z.

Load media. Turn printer on and wait for green light (Approx 1 minute)
Press feed key and keep it pressed until green light blinks once, then twice, now release feed key.

Misfeed:
Put the paper back in properly, and then press the control panel button. The printer will start printing again.

this is according to the website