HP Cartridge C9351,
#21

Refill Instructions
Black cartridge

Instructions

1. Put the cartridge on some paper towels in an area where you can tolerate a spill.

2. Peal back the top label.

3. Fill the syringe with 5 ml. of black ink.

4. Very S-L-O-W-L-Y inject ink into the hole under the label.

5. When finished, replace the top label or peal it off (it will make no difference in the printing).

6. Replace the cartridge and run 1 - 3 cleaning cycles as per printer instructions.
Or print the following pages:
http://www.refillinstructions.com/black.htm for Black

If necessary leave cartridge in printer for up to 8 hours.

The cartridge will print just like a new one. Even though the cartridge prints good, the ink level gauge will not read full after a refill. To reset the ink level gauge back to full follow these instructions:
This will allow you to reset the ID system & Ink Level Indicator built into the printer.

RESETTING
1. Remove cartridge from your printer.
2. Place a piece of tape over the top left contact as shown in red on the picture to the right.
3. With the tape covering the contact place cartridge back into printer.
4. The printer will perform and alignment page.
5. Once an alignment page has been printed remove cartridge from printer.
6. Place a piece of tape over the second contact shown in blue.
7. Place cartridge into printer with both pieces of tape. (One covering the first contact and one cover the second contact.)
8. Printer will print another alignment page.
9. Once the second alignment page has been printed remove cartridge from printer.
10. Remove tape pieces from cartridge contacts (Make sure there is no residual adhesive on cartridge contacts.)
11. Place cartridge into printer. Cartridge should now read full.

Additional Notes:
As stated above it is very important that there is no residual adhesive on the cartridge contact point. This will make reading the cartridge difficult.
If the reset did not work on your printer, you can cycle cartridges through to reset the level. You will need two extra cartridges and the one you refilled. First, put the refilled cartridge in the printer. Allow it to recognize the cartridge and print an alignment page. Take that cartridge out and place in the first extra cartridge. Allow it to recognize and print an alignment page. Take the first extra cartridge out and place the second extra cartridge in. Allow it to recognize and print an alignment page. Take the second extra cartridge out. Place the refilled cartridge back in the printer. It will print an alignment page and then the estimated ink level will be reset to full.