Question about HP Officejet Pro L7590 All-in-One InkJet Printer
While using a re-fillable ink cartridge on my L7590, I forgot to remove the "air" vent plug, and got some air into the cyan ink line. I've managed to purge the air from the line, but the cyan ink still won't print. I purchased and installed a set of new HP Brand 88 ink cartridges last evening, but still no success. I've tried running the clean head process several times.What could be wrong and how can I try to fix it.
My recipe for print head cleaning:
1. Soak the print head in distilled water until it is very clear. Use a small plastic container that did not contain any chemicals in it before procedure. Single use containers should be used.
2. Leave the head in distilled water solution for 24hrs. Make sure water level covers ink inlet ports too.
3. Change distilled water in the container and heat it to degrees 40-50C. Too hot can damage the dead so make sure to not overheat the water. When the water is ready submerge the head into the container for 15mins or so. Make at least 4 cleaning cycles this way.
4. Put a coffee filter on the table, underneath the coffee filter put 3 - 4 sheets of paper towel to absorb the cleaning solution.
5. Put the print head on the coffee filter and get some soda straws (they are ideal for ink ports on pixma printers) remove rubber padding around ink ports on the print head by using some instrument as tweezers. Recommended way is to submerge the head into distilled water because rubber padding can be removed easily without friction in water. Now when you are ready connect each soda straw to every ink port.
6. Make a cleaning solution by using few drops of ammonia solution and distilled water. For example 2ml of ammonia and 19ml of water in a 20ml syringe. Mix the solution by shaking the syringe.
7. Fill the soda straws with cleaning solution. If you get air pockets in the straws use another 20ml syringe to connect and force air trough the straws until there are no more air pockets and solution level is decreasing in the straws. Take some patience the method is slow but well worth it. The solution should decrease faster as more nozzles are cleared. Don’t hesitate to use the empty syringe to force some air trough the nozzles if you get air stuck when filling the straws.
8. Finish the cleaning by injecting pure distilled water and by submerging the print head into distilled water for 15mins. Then blow the ports with air using a syringe with a soda straw.
9. Clean the gold contacts on the head with some isopropyl alcohol and then immediately install into printer and perform 2 to 5 cleaning cycles or some deep cleaning to prime the head, and then print some purge pages. Now you can print nozzle check to see how well the cleaning unclogged the nozzles.
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Posted on Aug 27, 2008
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