Another Canon Pixma iP8750 problem

[sbelt]

Hi there - I have found a series of exchanges with The Hat because I have a printing problem on my Pixma iP8750 - but not like any other indicated on this forum. I have had the printer since early 2015 and used it without any problems.

After using the CD printer tray on my machine at Christmas, I started to get the issues indicated on the attached scan of an A4 landscape colour print. There is a marked error down each print approximating to the side of the CD tray when it was used. However this changes position towards the bottom of the printout. Also, the left and right margins show a stepped edge as if the printhead is not travelling in the same line each forward and return movement.

After cleaning nozzles etc. and doing a factory reset; and checking my two Mac laptops (a new Macbook Air and a well used Macbook Pro from 2013 - so different MacOS systems) - I got nowhere, so started a web search that brought me here.

In desparation I have now bought a replacement iP8750 - and this allowed me to:

Exchange the print heads to check both work - OK.
A n
ew set of ink cartridges to check both work - OK
Print jpg and pdf files from both computers - OK, except for this problem on the older one.
Use different cables and Airprint on both - OK except for this problem on the older one.

It would suit me to get this machine working again - but I have run out of ideas. From your feedback on this forum, I guess it is probably a logicboard problem, and would appreciate any views?

 

[The Hat]

I guess it is probably a logicboard problem, and would appreciate any views?

OK let’s start at the top, no it's not the logic board..

Mac old or new, you shouldn’t be using Airprint as that print driver is totally crap, remove it and install the proper print driver from Canon website..

Now to your photo print problem, first you should print out a nozzle print check, and then examine it for issues on each colour block.

Next you need to clean the timing strip with window cleaner and a paper towel both sides, but be careful not to put too much pressure on the plastic strip while cleaning..

Now print another nozzle check and compare both for any improvement, then try your photo again and see if it prints ok the second time..

When your printer gives you any print issues, you should stop all test prints until your nozzle checks are all perfect, otherwise you run the risk of ruining the print head..