11-22-2016 02:19 PM
I am posting this so others can recognise the signs of a heat damaged print head on a Canon ip7250. This is caused by prolonged printing when there is no ink. If the pigment black head is damaged it will show double printing in a bow shaped pattern. The problem is not improved by head cleaning. The only solution is to buy a new printer or replace the head*.
Nozzle check example of heat damaged head:
Notice the bow shape is greatest in the middle where the head gets the hottest.
This is not to be confused with another kind of double printing caused by a dirty calibration strip. With a dirty calibration strip all the colours will print double parallel lines with no "bow" shape.
*Beware of some very cheap print heads from China sold on e bay for the Canon ip7250, QY6-0082). They are sold as original Canon "NEW" but are actually taken from used printers and are cleaned and repackaged to look like new. I recently bought two of these and had to return them as they didn't work.
02-15-2017 09:58 AM
Thank you for this info. Only wish I had found it earlier as I purchased one of those cheap ebay heads.
When it didn't work Igot a new MX475 printer as less than £50 and recommended by Which.
I wanted to mend the old one but what a crazy world where you can buy a complete new printer for about the same as a new print head.
02-21-2017 02:33 AM
Thank you, Chris
I have two printers (an MG5560 and a MX926) and you have just saved me from paying out $30 each for the repair shop to look at them.
I'll start saving for a new printer.
In the meantime, I find that if I change the text of the document to dark blue, it doesn't use the damaged black head and the printing is perfect.
02-21-2017 05:45 AM
I am glad I was able to help. Yes if you change the text colour to dark blue or grey the printer will use the colour nozzles and you will get a clearer printout. As Geoff says, its sad that its more cost effective to buy a new printer rather than just replace the head.