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‎09-12-2025 12:09 AM - edited ‎09-12-2025 12:10 AM

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Hello, I have had issues with deveoper units failing after 50% usage.  2 x HP Color LaserJet MFP E78323 machines, cyan and Magenta on each.  The latest machine has printed around 150k pages. Is there a way to get them working again, is this a known issue.  When printing these colours do not print.  Toner is full, Drums have been changed.  Seeems its the deloper units again.  Can anyone give me some advice on this. Its funy that its the same 2 colours as the last machine, Cyan and Magenta, is there a known issue ?? There are no error codes or anything on the printer -  Many thanks, Chris.

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