On the µR10000/µR20000 dot model, why does the color change between periodic printouts?

It changes color so that each color of the ribbon is consumed as equally as possible.

µR10000 & µR20000

The μR series are the compact industrial recorders with the recording widths of 100 mm (μR10000) and 180 mm (μR20000). Measured data can be saved to an SD memory card while recording on chart paper.

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