Use new black developer units for colors. Just swap chips. Run 60 11x17 halftones of the color dev unit you are replacing, around 40 pages you will see the black changing to the color. After around 60 pages black will have changed to the color!
Also I've brought back many dev units that have crashed by adding developer from another bad unit until I get the proper TCR reading. Of course did this after replacing any overlife consumables that caused the dev crash in first place.
There is NO way I'm paying Kon/Min $500+ for a color dev unit !!! I'll buy an off lease working C224 for around $500 and get 4 dev units plus other parts before paying kon/min that kind of money !!!!
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