HP LaserJet Enterprise 500 color MFP M575 Series - Page 58

The DC controller notifies the formatter of an error if any of the following conditions exist:
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The memory tag fails to either read to or write from the DC controller.
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The RD sensors detect a missing or incorrectly installed toner cartridge.
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The accumulated print time reaches a specified time period or the cartridge runs out of toner.
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The toner level in any of the toner cartridges drops below a certain level.
Developing roller engagement and disengagement
The product can print in full-color mode or in black-only mode. To print in black-only mode, the product
disengages the developing rollers in the cyan, magenta, and yellow toner cartridges. This maximizes
the life of the cartridges.
Figure 1-22 Developing-roller engagement and disengagement control
Four developing units engaged
Only the Bk developing unit engaged
Four developing units disengaged
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30 Chapter 1 Theory of operation ENWW