I`ve got lots of colour machines that only do black and white and as Stirton says the image unit life will count up as the machine stabilizes regardless of the print count, bearing in mind that if the machine is subject to temperature changes it will stabilize more frequently. However if your not fussed about colour quality then I would do what he has suggested ie: set the iu life to no stop and ignore any warning messages about replacing the image units. All mine are set that way and my customers understand that its nothing to panic about.
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