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Save Hundreds of Pounds Replacing HP9000 Printheads Yourself

HP9000s Head Replacement

Although we have found this printer to produce a good quality print and to have been reliable, there is a question mark over the longevity of the printheads and also the high cost of replacing them. You will find, in this article, my experiences dealing with these issues and I hope you will find some inspiration for dealing with your own problems.

If you own or operate one of these printers you will be aware of the cost of replacement of the printheads and may also be aware of the relatively short life-span reported by a number of owners. Hopefully, if you read on, you will find the confidence to attempt the replacement yourself and save up to £400 per head in doing so.

When routinely printing the IQ test print to confirm that the quality of print from each head was acceptable, we noticed that the L Magenta swatch had a scratchy appearance. We were advised that this was an indication of a head that was wearing out and that it would need replacing soon.

Before committing ourselves to replacing it we decided to give the head a clean by hand using lint-free cloth dampened with head cleaning fluid and gently dabbing the head in order to soften and them draw through any congealed ink. Repeating this a number of times resulted in the print quality returning to its original quality.

Over 2-3 days, however, the IQ print became somewhat 'scratchy' again - this did not generally affect the prints that we were producing but did cause problems in areas of flat colour especially light greys.

We continued in this manner for 2-3 months with reasonable success but eventually the amount of up-time deteriorated to a level where the machine could print no more than a few feet before needing a headclean, so the decision was taken to replace the suspect printhead. The price that we were given was around £1800-£2000 for parts and labour. A maintenance engineer was arranged to attend on the Tuesday following the weekend to double-check that the head needed replacing.

We decided to park the head in the docking station and switch the machine off - this seats the printheads in a bath of ink and is recommended in order to soften any congealed ink and aid cleaning.

On the Monday the machine was switched on and the heads put through the standard cleaning routine and left for the engineer.

When the engineer arrived he ran the IQ test to ascertain the state of the print quality and found that all 6 heads were printing scratchily. The heads did seem to recover a little after a number of strong purges but it was not consistent and still did not produce a useable print quality.

After a significant amount of further cleaning it was decided that we would replace the Magenta and Light Magenta Head under a scheme run by HP for out of warranty machines where they agree to sort out any problem (including changing up to 2 heads) for a 1 off charge of £1000 (I?m not aware if they are still running this scheme)

When a second engineer came to change the heads he noticed that there was an air leak into the ink reservoir. Once this had been fixed and the heads cleaned a number of times, the prints being produced were of an acceptable quality and the IQ prints appeared to be improving a little each time they were printed.

We were concerned, however, that once the engineer had gone, if the heads deteriorated we would have missed our opportunity to have them replaced as part of the HP scheme. We had some concerns that if any of the printheads deteriorated after the engineer had signed off the job that we would have missed the opportunity to have them replaced as part of the HP deal, so we asked him to leave the heads with us.

Almost inevitably, the day following the engineers visit, the light magenta and magenta heads deteriorated significantly. The earliest that the engineer could return was in three days so we decided to investigate replacing the heads ourselves.

Parking the head and switching of the machine we then removed all the covers on that side of the printer to allow easy access. Then we removed the metal covers, back and front to the printhead assembly. Next using a scalpel we scratched marks into the head fixing plate to mark the current position of the head. Using the caps supplied with the new printhead, seal off the ink flow and remove the connector for the electrical feed. Take a small socket driver and undo the screws which secure the head to the fixing plate.

We then removed the printhead from the storage packet and carefully placed onto the head fixing plate, lining it up with the marks previously made. Next re-connect the ink feed and electrical connections. Replace covers and run the ink system purge routine in the maintenance menu to fill the printhead with ink and run the head alignment routines to fine tune the alignment.

We did this with both heads and they are working fine. All the other heads have improved with use (and regular cleaning) and are printing well.

We have since been made aware that the use of an ultrasonic cleaner can return the heads to a good condition when they have been clogged with ink.

About the Author

Matt has been involved in the design and production of exhibition stands for 2 decades and has run his large-format digital printing business in Maidenhead for the last 8 years. http://www.exdisplay.co.uk

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