refilling the HP 901 black ink cartridge

Step 1. Turn your printer on and take out the cartridges.
Step 2. Take a piece of tape and cover contact #1, as in the picture below.
Step 3. Put the cartridge back into the printer. It will print out an alignment page.
Step 4. Take the cartridge out and put tape over contact #2, as in the picture below.
Step 5. Remove all the tape and put the cartridge back into the printer. The ink levels should now be reset.