Canon black doesn't print on return pass of head

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i560

This one's weird. A document won't print every other pass of the print
head (left to right or the other way around, I don't know).

HOWEVER . . .

As long as I park any color at all in the vertical stretch of paper,
the black text will print fine (no blank passes).

So if I have a full page of text and the top half has a thin vertical
blue line to one side (for example), the top half will be readable and
the bottom half will be banded with blank passes of the head.

This was a tough one to google for, too. :-/

Any ideas?

- Scott
 
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<scott.marquardt@gmail.com> wrote in message
news:1110041536.909194.220110@z14g2000cwz.googlegroups.com...
> i560
>
> This one's weird. A document won't print every other pass of the print
> head (left to right or the other way around, I don't know).
>
> HOWEVER . . .
>
> As long as I park any color at all in the vertical stretch of paper,
> the black text will print fine (no blank passes).
>
> So if I have a full page of text and the top half has a thin vertical
> blue line to one side (for example), the top half will be readable and
> the bottom half will be banded with blank passes of the head.
>
> This was a tough one to google for, too. :-/
>
> Any ideas?
>

If you perform a Nozzle Test Pattern, are all grids complete?
Are the boxes below the grids complete?