How can I refill an HP51645A inkjet cartridge?

I have ink but cannot figure out how to take the cartridge apart to add ink. I've refilled other HP cartridges but this cartridge different. Any suggestions would be appreciated.





Thank you.How can I refill an HP51645A inkjet cartridge?
Flip that bad boy over. Print head facing up.


You see that little circle on the underside. Well if you remove the circular tape it will reveal a small ball bearing.





Before you complete the next step I strongly recommend that you have a kit designed for this cartridge. Punch that little ball bearing inside the cartridge. Voila a place to fill!





There is no sponge inside this cartridge rather air bags. You are going to want to force a little air through this whole to separate the bags. Inject 40 ml of ink. Seal up with new ball bearing (if you have the proper refill kit you will have them (standard B.B's sometimes work as well)


there should be no leakage around the sides of the ball bearing! Finally cover the ball bearing hold with some electrical tape.





It's done.How can I refill an HP51645A inkjet cartridge?
http://www.inksupply.com/51645a.cfm
use a plunger...
Instructions





Step 1) Put the cartridge on some paper towels in an area where you can tolerate a spill. Be sure that you are wearing old clothes, since the first time you fill the cartridge, you will probably get some ink on your clothes and hands. You may wish to wear rubber gloves if you don't wish to stain your hands.





Step 2) Turn the cartridge upside down.





Locate the rectangular copper printhead where the ink comes out.


Behind the printhead is a black plastic rectangular well.


Behind the rectangular well is a round black dimple in the center of the cartridge bottom.This round black dimple looks similar to a mold release mark from the plastic mold. In reality, this dimple is a small piece of black rubbery plastic which conceals the original fill hole of the cartridge!





Step 3) Remove the black dimple plug over the fill hole. You may need to scrape it off with a knife or screwdriver.





Step 4) Push the ball in the fill hole into the cartridge with a ball point pen or similar device. Forget about it.





Step 5) Inject 30 ml (one syringe bottle) of the ink into the fill hole slowly. You may add an additional 5 ml if the cartridge will take it. Fill to the bottom of the fill hole.





Step 6) Now you must seal the fill hole air tight. We suggest using silicon rubber, hot glue, or (preferred) a 10-32 x 1/2 inch long (M6) set screw. (Stainless steel is preferred for longer life, but regular steel will do. These set screws should cost you 25 cents or so at the local hardware or home center store.) The set screw will self-tap and form an excellent plug which can be removed and re-installed each time you refill. Do not use a screw with a round or flat head! Only use a set screw so that this can be recessed below the surface of the cartridge.





Whichever you decide to use, you should squeeze and hold the cartridge just before sealing to set up the vacuum. Make sure the seal is flush or just below the cartridge surface.





Step 7) After sealing, release the sides of the cartridge and squeeze again, twice. A couple of drops of ink should come out of the printhead.





Step 8) You might wish to set the cartridge over a paper towel for an hour as a drip precaution. Expect a few drips until the vacuum stabilizes. Before inserting the cartridge, blot off the hanging drop of ink with a paper towel.





Step 9) When inserting the cartridge, first tilt the cartridge so that the ball is caught above the set screw and doesn't roll into the area above the print head, where it can occasionally block off some ink flow.





Step 10) Immediately run the printhead cleaning software. (Go to the HP software and select ';Services';.)
call cartridge world they will do it cheap

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