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.
refilling the HP 901 black ink cartridge
