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Posts: 1
Registered: ‎01-14-2013
Canon MP640 banding problem

After two years problem free, I'm having issues with printing and copying, and would appreciate feedback about (a) potential source of the problem and (b) how I might go about fixing it.


The following images show what's happening.


1. Printing text: every third line or so looks like it has been bolded. Copying text has the same result.


lorem ipsum.jpeg


2. Printing images: banding progressively becomes more pronounced as the page is printed.





3. Check pattern: top of PGBK row is missing alternate bars.


check pattern.jpeg


(The last BK row doesn't actually print in rainbow patterns: it's plain grey.)


I've cleaned and deep cleaned 4-6 times, removed the print head and flushed the nozzles with warm water without success. 


I'm using an iMac with OSX 10.6.8. Problem happens with both wifi and usb setup.


Any idea what's going on?





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