Digital BW, The Print

I wonder if it's just a bad printer. Odd problem.

Scott

Jeff Medkeff wrote:

>
> When last we discussed the C86 tiny random black dots issue, I had noted:
>
> 1) They appear on the paper outside the image area, wherever the head
> flies over the paper;
>
> 2) They are reduced by using high speed mode, apparently because the
> number of marginal overflies is lower.
>
> 3) It apparently isn't a driver issue, as I have the symptom with driver
> v. 5.5 and 5.4; meanwhile, we know for certain that other C86 users do
> not have the symptom with 5.4.
>
> I can now report that switching my C86 out to the Epson OEM color inks
> and printing some images reveals no errant dots visible anywhere in the
> print.
>
> I can also report that when printing a black square with a white center
> on the paper, the errant dots appear with a random distribution wherever
> the print head passed over the paper; that is to say, the dots appear in
> the margin and inside the square at about the same density. It is not a
> repeatable pattern of errant dots. It is, however, about the same number
> of errant dots per square inch everywhere, and in each print.
>
> When I refer to "tiny random black dot," I'm referring to something that
> is roughly circular, maybe elongated a little in the direction of the
> head travel, and is less than half a millimeter or so in diameter (I
> don't have a magnified reticle to actually measure it, so this is a
> guess). It is, in other words, small and not obtrusive on a casual
> glance at the image, but quite a bit larger than the dots that appear in
> dark image areas.
>
> Ok, so I'm no expert. What is going on here? The best hypothesis that I
> can come up with is that the EZ black cart is somehow causing ink to
> leak through the head and drip onto the paper, but I would think I would
> be getting much bigger blobs and smears than what I'm seeing if that
> were the case. Any ideas?
>
> -- 
> Jeff Medkeff
> Eagle River, Alaska
>
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