Technical information

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1) Press and HOLD the printer’s ‘Reset’ button for five (5) seconds...this will reset the HP 940 cartridge's

smart chip, and may correct the current issue.

2) For expired ink/cartridge error messages, please refer to the following information on how to bypass:

http://inkjet411.com/?page_id=1457

---- If you observe an “Expired xxxx ink cartridge” alert or message, this error may be bypassed

by performing the following:

a. Press and HOLD the Power button.

b. Press Resume button 3 times.

c. Release the Power button

NOTE: The only way to fully reset the ink level monitoring is to replace the chip, but Costco

photo center personnel do not do this as it is not vital/required to support HP OJ PRO 8500 (or

8500A) printer operations. Since it is not essential to supporting printing operations, chip

replacement is not included.

Now, since the ink level indicator is not re-set, it is not 'feature usable', meaning that you just need to

ignore incoming 'ink low' alert messages as they appear. Continue to print until you notice a missing

color, then replace that color (please see attached warning as a reminder).

However, losing this feature is not necessarily significant, because the ink level indicator usually has

substantial usable ink remaining when it shows "low on ink". Therefore, the warning has limited value,

because users who prematurely replace their cartridges when they see the "low ink" message are

wasting a lot of residual ink. In order to use as much available ink as possible, many users (not only

those who refill their cartridges, but many who have not yet tried refilling) always ignore the ink level

indicator "low" warning, and wait to replace/refill their cartridge until immediately after seeing ink begin

to fade on their printouts.

Many customers who disregard the low ink indicator keep a spare set of cartridges so that their printing

productivity is not disrupted when the cartridge runs out of ink. If the cartridge completely runs out of

ink and continues to be used when it is dry, this could damage the cartridge, so users should promptly

refill/replace their cartridge when the ink begins to fade. This fading process is gradual, so that you will

have sufficient time to refill/replace the cartridge before the risk of empty cartridge printing. In

summary, most refill customers agree that the huge savings of refilling is much greater than the

potential loss of the low ink indicator feature.

For more information on HP 940 cartridge 'Quick/Usage Tips', please refer to the following information

on Inkjet411: http://inkjet411.com/?page_id=1423

NOTE 1: The HP 940 printer models have two electronic PRINTHEADS (each of these electronic devices

are responsible for pulling ink from the ink cartridges and then firing the ink droplets onto the paper) –

both PRINTHEADS will eventually fail depending on printed content, printer duty cycle (i.e. typically