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When you replace the developer unit, you have to reset the developer counter first, with the machine open and after you have removed the old developer. Once you have reset the counter, you can then install the new developer and your machine should recognize thats its been changed and start the count over.
If you dont have it, id suggest purchasing the service manual for that machine here. https://www.tradebit.com/filedetail.php/278469362-konica-minolta-bizhub-42-36-full-service
Section 6.3.3 covers the proper way to replace the developer.
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Its slightly different in each model of Konica machine.
The service manual for your specific machine will show you how to reset the developer counter in section Section 6.3.3