Tip & How-To about HP LaserJet 2550n Printer

How to use all of the Toner in your HP 2550 series printer

Most laser printers on the market today use a computer chip to tell the printer/computer when it's empty. The chip does not have any kind of physical sensor to tell whether the toner is actually low or not, instead it keeps track of how many pages were printed using the toner cartridge. (there is a separate chip on each cartridge, so in a color printer there are 4 chips one of each color and one on the black)

The chips tell your printer/computer that they are low or empty long before the toner is actually low or empty. If you replace them when the computer tells you to you are throwing away a lot of good toner.

To make things worse, the printers will not print at all (color or b/w) once it believes that one of the cartridges is empty.

There are 2 ways to 'trick' your printer into not believing that a cartridge is empty.

(Solution 1)
The chips that are on the cartridges can be swapped out with new ones. There are several vendors that sell aftermarket chips for your 2550 toner cartridges. Do a general search for 2550 reset chip and you will find vendors that sell reset chips. You can also find them on eBay for around $20-$25 a set.

The chips themselves are very simple to replace. Use a small screwdriver and pry off the old chip. They are just held in place with a strong piece of double sided tape. If the old tape is still there and good, you can just put the new chip in it's place, otherwise stick the new one on with some double sided tape.

This trick can also be used to extend the life of your printer drum, as you can buy reset chips for it as well.

(Solution 2) A bit clunky, but this one is free
You can literally trick your printer into not reading the info from the chip and thus not stopping you from printing. This solution is not as nice and clean as the first one, but it does work and it's free. You will have to repeat this solution from time to time if the printer stops working.

  • Step 1: Power off your HP2550 printer.
  • Step 2: While the printer is off, press and hold the big green button on the printer.
  • Step 3: While still pressing the green button, power the printer back on using the power button (lower back corner on the left side of the printer).
  • Step 4: Continue to hold the green button while the printer initializes. During this time all of the front lights will turn on one at a time and then all but the first green light (the ready light) will turn off one at a time - this step can take several minutes to be patient and keep holding the green button.
  • Step 5: When all the lights have turned off except the front green light, release the big green button. The front lights with flash a few time, while they are flashing, press and release the red circle button 1 time.
  • Step 6: You may have to reload the printer driver at this point. If your computer has detected new hardware then go ahead and reinstall the driver.
Be aware
  • Some of the back cartridge lights (the back 4) may stay on or flash, this is OK.
  • The front green 'Ready' light will no longer be on, again this is OK.
  • If at any time your printer stops printing all together, then go through these steps again. I have had to redo this about 10 times over the past 2 1/2 years. It is a nuisance, but it saves a great deal of money.
  • If this does not work the first time then try it again. Each step must be done in order and correctly otherwise it does not work.
I have had my printer for almost 3 years now. The original cartridges that came with my printer stopped working because they told the printer they were empty about 2 1/2 years ago. I started doing this at that time and all 4 of mine (I have a 2550 color printer) are all still working and have not started to fade, so there was a lot of toner left when my printer said it was empty.

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1 Answer

I refill the toner for samsung scx4720fn .Now its show toner empty replace the toner on the printer lcd. How i can slove this problem.


Dear raju
Pl. replace the toner chip with a fresh. As the toner chip known as CRUM stores the data about toner and printer irrespective of physical qnty. of toner. The chips are available in local market also you can search with on line stores like ebay,amazon etc.
Thanks.

Mar 16, 2015 | Samsung Office Equipment & Supplies

1 Answer

toner empty error


In order for your printer to read the cartridge as full the chip on the toner will need to be replaced/reset. Sadly these cartridges are unable to physically check toner levels and rely upon counting pages/page coverage to estimate.

Dec 06, 2012 | Ricoh Aficio Sp 1000sf All-In-One Laser...

1 Answer

i ran out of toner, so i refilled the toner and put it back into the printer, it is still reading empty and will not print unless i put in a new cartridge. please help


Today printers have a chip in the toner that indicates if the cartridge is empty or full. Even if you fill the cartridge, it doesn't matter. The chip is telling the printer "it is empty", so as you can see, Dell wants your money.

Sorry about that.

Dec 11, 2010 | Dell 3130cn Color Laser Printer

4 Answers

how do i install a toner chip on my hp Cp2025


TONER CHIP on CP2025 printer:
This resource may help
http://resources.lasertekservices.com/hp-smart-chips-overriding-this-lockout-mechanism-with-reset-chips/
Gives types of chips to use, sales in USA, and certain things to take note of.
The toner reset chip replaces the original HP ID chip and is designed to be used only on refilled HP cartridges.
It is not recommended to force toner cartridges to run on empty, as this can cause damage to both the printer and the toner cartridge.
The reset chips are dedicated to one color only, so that user can not swap toners.
As for actual physical installation, just push the new ID chip in until it clicks into place. The correctly manufactured ones should be a snug fit.
I have seen techs using a drop of contact glue behind the chip-board to secure it.
Copper pads face outwards towards matching printer pins.
See photo for polarity 'square' pad.
My printer is Samsung, not HP, so your toner cartridge may be a different shape.
samsung_cyan reset chip-4febss1ixlhhr5zh2r4k1b5y-2-0.jpg

Nov 07, 2009 | HP Color LaserJet 2550n printer + HP Color...

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