Canon G7020 Not printing black

jackson

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Worse printer I ever owned.
Couple of months ago ended up doing multiple 'ink flushes' to get decent colour and b/w; today cannot get any black (pg bk 20), at all.
Tried multiple cleanings/deep cleanings/flushes to no avail.
Anyone know what's next?
 

Ink stained Fingers

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Do you see any bubbles in the tubing going to the printhead or is the tube for the black ink completely empty ?
 

jackson

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I can see a bubble in one line.
can 003.jpg
 

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That bubble has not reached the printhead yet and cannot be the cause of the misprints. I'm not aware of other cleaning methods for a Canon Megatank printhead, the black printhead in Germany for the G7050 is listed as the QY6-8029 as a sparepart.
 

jackson

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Yes, the bubble is in the cyan.
Looking closer, I don't think there is any ink in the black tube.
 

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jackson

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I used a syringe to pull ink up to the head, the tube is full but there is no trace of black after multiple cleanings/flushes.
 

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How old is the printer - do you still have warranty ?
the tube is full but there is no trace of black after multiple cleanings/flushes.

Is the ink running back when you close the lid on the printhead ?
 

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the ink tube(s) empty after a time.
That would mean that there is an air leakage into the black ink tube; I don't have an idea how that's possible, I'm not familiar with the constructional details how the tubes connect to the printhead and are sealed at this point. I think that this problem would require repair by Canon.
 
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