Replaced the K imaging unit. The new unit does not reflect it being replaced on the copier. Consumables screen shows the K unit at empty still.

Check copy life of consumables like Developer and Drum if ghost image might be Cleaning Blade found Imagaing Unit or Upper Fuser at Fusing Unit. If replace the whole imaging unit can solve your problem but individual parts try to clean first imaging include charge roller before you replace drum, cleaning blade and developer. mostly we replace developer only.

replace your consumables. (Toner or Drum)

Some Brother laser printers have separate consumables - the toner cartridge and the drum unit. From time to time you may need to replace only the drum unit and not the toner cartridge.

The error LED lights up, or an error message shows on a flat screen panel, when the drum unit is near the end of its working life. Use the drum unit until you have a print quality problem, then replace the drum unit with a new one.

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have you replaced all of the consumables?
drums X2 black and color
developer units X4 CMYK
transfer imaging belt X1
Fuser unit X1
if the unit has over 60k prints it will need to have these items replaced and once that is done the color registration will come back inline.

you need to replace the K pcu and if the unit has 60K prints all of the consumables need replacing CMYK drums CMYK Developers and the imaging transfer belt and fuser unit

Hi rmcday: Here your problem. The imaging unit creates the image using an electro-photo process. The imaging unit consists of the following: ■ An OPC Drum ■ Waste Toner Assembly ■ Charge Roller Assembly 9.0 Consumables, Routine Maintenance Items and Options Item Life based on 5% coverage Part No. Replaceable by Black Standard Toner Cartridge Black High capacity 3,000 7,000 106R00679 106R00684 User replaceable Cyan Standard Toner Cartridge Cyan High capacity 2,000 5,000 106R00676 106R00680 User replaceable Yellow Standard Toner Cartridge Yellow High capacity 2,000 5,000 106R00678 106R00682 User replaceable Magenta Standard Toner Cartridge Magenta High capacity 2,000 5,000 106R00677 106R00681 User replaceable Imaging Unit 50,000 images 108R00593 User replaceable Transfer Belt 50,000 images 108R00594 User replaceable 500-Sheet Feeder N/A 119650600 Waste Toner Cartridge 3,000 to 5,000 pages (color 5%) 106R00683 User replaceable. Your imaging unit may have exeeded it life of 50,000 pages and will need to be replaced. Hope this helps

its classed as consumables/ counters

turn macine off wait 5 min repower and run recheck

These units are automatically reset with a fuse. When you put the imaging unit in it will completes a connection which resets the count then simultaniously blows the fuse. Sometimes the fuse blows before the reset, which is what it sounds like happened here. The machine should print normally but the error will persist until the unit is replaced with a new one. Is the the imaging unit an OEM unit or remanufactured? Whoever you got the unit from should replace it as defective free of charge. If it is OEM you might have to go through Xerox to get it replaced. I don't know if the Big Box stores will.

Without the Bizhub model number. You mite try this, take each of the image units out and shake them so that all of the developer and toner are spead out across the entire image unit one of the image units mite have been stored with all of the developer at one end, and when place in the machine the motor for that image unit has a hard time trying to turn..

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f