Technical information

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manufacturer instructions first as the Inkjet411 procedures are provided for general guidance

purposes only. Please note that a dirty service station can also cause poor image quality and/or

ink cross-contamination or bleed between different colors:

http://inkjet411.com/?page_id=1495

E. If the poor/degraded print quality problem still cannot be corrected, then the PRINTHEAD may

be dry and may need to be hot-water flushed. Refer to PRINTHEAD flushing video procedure at

the following link or refer to steps below: http://inkjet411.com/?page_id=2412

1. Remove all ink cartridges from the printer.

2. Remove the printhead – in most cases you will need to pull up on the lever at right side of

carriage assembly to unlock the printhead. Lift printhead straight up to remove.

3. Over a sink, run warm tap water directly into the 4 ink ports for approximately 2 minutes –

this will effectively saturate the foam ports and blow ink out/thru the nozzle plate bottom.

4. Using a lint-free towel, remove water from rear/bottom electrical contacts. Ensure

printhead electrical contacts and exposed surfaces are fully dry.

5. Install the printhead into the printer. You may observe a “Replace Printhead message” so

you will need to cycle printer power by turning printer off and the n on to clear the error.

6. Install ink cartridges and retest printer. You should observe a New PRINTHEAD alert

message followed by an approx. 4-minute preparation countdown prompt.

7. If permissible, activate the ‘Clean Printhead’. This can be done from the printer’s control

panel or software printer driver (for example, by selecting ‘Tools’ – ‘Clean Printhead’, or

similar).

F. To perform advanced PRINTHEAD diagnosis please visit our 'HP Printer Diagnostic Test' page:

http://inkjet411.com/?page_id=1813

*The HP 920 printer models have an electronic PRINTHEAD (customer replaceable) 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) – the PRINTHEAD will eventually fail over time depending on printed content,

frequency of printing and printer duty cycle (i.e. rated for max. of ~15,000 printed pages over life, but

the average throughput is more in the neighborhood of ~6000 to 9000 pages). Video of how the

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

NOTE 2: “Empty” and “Low Ink” alerts are COMPLETELY NORMAL for HP 920 ink cartridges which have

been refilled! While at first this may be an unusual workflow, it does allow print operations to proceed.

Only brand new ink cartridges support ink level monitoring. For “Low Ink”, "Unauthorized ink", "Non-HP

ink", "Fraud", "Counterfeit ink" or similar messages, you may ignore/dismiss this message by pressing

'OK' once for each cartridge, so that the printer resumes its normal operation. We suggest you do this at

the printer's control panel immediately following ink cartridge(s) installation.