Technical information

ink cartridge is not used). You can remove the tri-color cartridge, reactivate the tap 41 test and the

printer will print the diagnostic test print in black ink.

You can also test general printer performance by running the 'Tap 10' diagnostic test, use same

procedure above and enter "code = 10". Both the ‘Tap 41’ and ‘Tap 10’ tests are ‘forced print tests’ –

the printer will make every attempt to print the pattern whether the ink cartridges are good or bad…the

patterns should be utilized to diagnose cartridge health. If ‘regular’ printing is still not possible then one

or both of the ink cartridges is damaged.

NOTE 3: It is possible to 'temporarily' bypass the cartridge error message (for emergency printing

purposes only), please refer to link above/below for video/documentation instructions. However, if the

cartridge is determined to be electrically damaged, largely dependent on the 'Tap 41' diagnostic test

results, the cartridge will eventually need to be replaced with a new one. With a marginally performing

ink cartridge, this typically results in allowing 1 entire print job to be printed at a time. If this does not

permit any print operations then the cartridge has severe internal electrical damage and wi ll need to be

replaced:

http://inkjet411.retailinkjet.com/wp-content/uploads/2013/04/HP-74-75-Problem-Resolution_v10.pdf

D. Cartridge Error Bypass ( Emergency Printing Only - http://inkjet411.com/?page_id=544 ):

1. Press the * and # keys simultaneously.

2. Enter 123 (or 124) at keypad. The ‘Underware’ menu should be displayed.

3. Use the arrow keys to navigate to the Information Menu. Select Ok.

4. Use the arrow keys to navigate to the 'checksum for relock data input'. Select Ok. LCD should

display a 5-digit number after a few seconds.

5. Attempt to send a print job to printer

NOTE: with a marginally performing ink cartridge, this typically results in allowing 1 entire print job to be

printed at a time. If this does not permit any print operations then the cartridge has severe internal

electrical damage and will need to be replaced.

*Many cartridges eventually do encounter problems or failures, especially after their original ink is gone

and they are re-used, and this is often unrelated to the refill process. The “Incompatible Print

Cartridge(s)" / “Print Cartridge(s) Problem” / “Refer to printer documentation” / “Cartridge Error:

Cartridge must be replaced” / “Cartridge in left/right slot is not intended for use in this printer“ /

"Now printing alignment page" error messages are typically indicative of failed micro-electronics

internal to the ink cartridge(s). Also note that it is common to have a marginally performing ink

cartridge (which was performing ok before) in the adjacent slot (i.e. color), then when a marginally

performing cartridge is installed into the other slot (i.e. black), both of the ink cartridge(s) then get

flagged with electrical errors. Running the 'Tap 41' cartridge health diagnostics test will confirm the

active state of both cartridges.