Technical information

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f. Select Ok. Screen should display “code = 0”.

g. Use the arrow keys to enter “code = 41” (or just enter 41 on keypad). Select Ok. The Tap 41

diagnostic test pattern prints.

NOTE: The Ta p 10 self-test print may also be initiated via ‘code = 10’ (use to verify ink nozzle performance)

Check the 4

line at the top of the printed report; an electrically good/stable PRINTHEAD will state “Pen Status:

Pen OK”………if any other message is displayed then the PRINTHEAD may have failed and may need to be replaced.

* Failure of the PRINTHEAD has nothing to do with refilled ink cartridges; the PRINTHEAD assembly is a

separate electronic unit in which the cartridges plug into and feed ink into. Refer to NOTE below.

4) To rule out printer/cartridge connectivity (assembly interface/connection) issues please ensure you

have followed all steps on the Inkjet411 support page - this includes PRINTHEAD removal and thorough

cleaning of the electrical surfaces on the PRINTHEAD and on the CARRIAGE ASSEMLBY:

http://inkjet411.com/?page_id=1451 (564 PH Removal-Cleaning)

http://inkjet411.com/?page_id=1495 (920 PH Removal-Cleaning)

5) If this does not remedy the problem, then you may have a defective PRINTHEAD in the printer (worst

case scenario), unrelated to the refilled cartridges.**

NOTE 1: The HP 564 printer models have an electronic PRINTHEAD within the base of the

carriage assembly (responsible for pulling ink from the 4 (or 5) ink cartridges and then firing the

ink droplets onto the paper) – these will eventually fail depending on print usage type and

printer duty cycle (i.e. rated for ~8,000 printed pages over life, but the consumer average is

typically closer ~6,000 pages). The printhead is replaceable and can be ordered directly from

HP.com. For information on how the PRINTHEAD functions, please watch the following video:

http://inkjet411.com/?page_id=2054

NOTE 1: The HP 920 / 920XL ink-series printer models have an electronic PRINTHEAD within the

base of the carriage assembly (responsible for pulling ink from the 4 ink cartridges and then

firing the ink droplets onto the paper) – this electronic assembly will eventually fail depending

on print usage type and printer duty cycle (i.e. rated for ~12,000 printed pages over life, but the

average throughput is closer to 6,000 to 7,500 pages). The printhead is replaceable and can be

ordered directly from HP.com. For information on how the PRINTHEAD functions, please watch

the following video: http://inkjet411.com/?page_id=2054

NOTE 1: The HP 940 printer models have two (2) electronic PRINTHEADS (responsible for pulling

ink from the ink cartridges and then firing the ink droplets onto the paper). One for

Yellow/Black, the other for Cyan/Magenta colors. Either PRINTHEAD will eventually fail

depending on print usage type and printer duty cycle (i.e. rated for ~20,000 maximum printed

pages). http://inkjet411.retailinkjet.com/?page_id=2054