HP C3844 & C3845 refilling instructions for HP printers.
PREPARATION
Note: These cartridges must be filled BEFORE they become empty. Once empty, they will clog themselves and refilling will not work. Run a self test on the cartridge before starting this procedure.
Step 1:
Remove cartridge from printer.
Step 2:
Using the small hand drill in your refill kit, make a hole in each chamber as shown below. You will find that there is a perforated area that marks where the holes should be placed. This is the vent system for the cartridge.
Step 3:
Using the syringe in your kit, attach the 4" long needle and draw about 10 cc of ink into the syringe.
Step4:
Using a tooth pick or needle. Push it into each chamber and pull it out, so that you know for sure which color ink goes in which chamber. Use a clean toothpick for each chamber. Set the cartridge, head down, on thick paper towel or newspaper before filling. Keep the head in contact with the paper while filling to avoid a drop from forming on the head. If this happens the drop can be drawn into one of the other chambers through capillary action. Another way to prevent this is to use a cartridge cover. The cover also protects the print head and can be used to store your cartridge for later use. For cartridge covers please see our accessories page.
Step5:
Fill the cartridge through the holes created in step 2 above, as shown above. Keep your needle as deep as possible when refilling. DO NOT OVER FILL. If the cartridge was empty, it requires only about 8 to 10 cc of ink maximum, maybe a little less. In the chambers that were not empty, only put 5 cc of ink. Too much ink causes dripping.
Step6:
Let the cartridge stand upright for about 30 minutes in a paper or Styrofoam cup to let any excess ink drain from the cartridge. Don't put the cartridge back into the printer if it is dripping.
Step7:
Gently blot the print head with paper towel and reinstall in printer. DO NOT COVER OR TAPE OVER THE FILL HOLES, leave them open. Run a couple of cleaning cycles and your done.
Trouble Shooting:
Colors Missing at Step 1:
If one or more colors are missing before you started this procedure, most likely the inkjets are plugged. Your chance of success is reduced to about 50%. It all depends how long you have been out of ink. If it is just a matter of minutes, you will probably be OK. If it has been empty for hours or days, you best bet is a new cartridge. This cartridge self-destructs if left empty for longer than about 30 minutes. Successful re-fillers learn to top it off before it goes empty. If you wish to proceed, read the next trouble shooting step.
Colors Missing after Step 7:
If there is no color present on your paper towel after putting ink in each chamber, then one of two things is wrong.
Clogged Jets - The very small inkjet holes, where the ink comes out can easily clog. Ink starts to dry from the outside air and the inside air, as soon as the chamber is empty. The dried ink blocks the holes.
There is a kitchen remedy using hot water. Boil some water in a tea kettle or microwave and pour it into a shallow container, like a saucer or the bottom of a paper cup. You only need about 1/8" to 1/4" of water. Hold just the print head in the hot water until the water becomes cool. Then immediately take your cartridge to the printer and run the cleaning cycles. You may have to repeat this 3 or 4 times. The hot water will soften up the dried ink and the cleaning cycles will force it out of the inkjet holes. If this does not work after about 4 attempts, try adding a little print head cleaner (see our accessories page) to the hot water.
Air Pockets - Air pockets are hard to correct. If you did not get your needle all the way to the bottom in Step 5, chances are you have created an air pocket at the bottom of the sponge.
If there is an air pocket, many times you will get ink coming out on the paper towel, but the cartridge will not print. The remedy is to go back in with the 4 inch long needle, this time get all the way down to the bottom and put in another 2 cc of ink. Then fold a paper towel into a small square, and attach it to the print head with a rubber band. Let it sit like this for a couple of hours. The paper towel should become saturated. After a couple of hours, remove the paper towel, then add 2 more cc of ink. Take it to the printer, run the series of cleaning cycles and see if it prints. If it does not, put the folded towel on it again and wait another few hours. Try it again. If nothing is coming out it is time for a new cartridge, you are spending too much time on it.
Plenty of Ink - No Print
This is an overfill condition. Too much ink in the sponge will cause it to leak very slowly. A film of ink builds up on the print head and during normal operation the jets of ink can not get through the film of ink, or they get through but have weird colors.
The remedy is similar to the air pocket remedy. fold a paper towel into a small square, and attach it to the print head with a rubber band. Let it sit like this for a couple of hours. The paper towel should become saturated. After a couple of hours, remove the paper towel, install the cartridge in the printer and run the cleaning cycles.
Color Contamination
In Step 4, if you did not keep the print head in contact with some paper while putting the ink in, it will create color contamination. When a drop of ink forms on the print head, the adjacent chamber sucks it in by capillary action. This causes minor color contamination.
The remedy is to run about 10 pages of each color. Make them solid pages, 8x10. This will get the ink flowing and hopefully purge out the ink that has minor contamination. If 10 pages doesn't do it, try 20 each color.
The Best Solution
The best way to avoid all of these problems is to fill BEFORE the cartridge goes empty. You will have to develop a feel for when it is time to top off the colors. Keeping track of how much paper you have consumed is one method, filling once per week or month is another, or go by the weight of the cartridge. If you know the empty and full weight, you can calculate how empty it is. When topping off don't use the full 5 cc of ink, use about 2 or 3. You can do it with out removing it from the printer if you know you won't be over filling.
For extra syringes, needles or other tools please see our accessories page.
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