That code indicates a problem with the (K) developing unit, which is the black color developing unit. Try removing and reinserting the black developing unit. If that doesn't work, probably need to replace the developing unit. Hope that helps.
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That code indicates a problem with the (K) developing unit, which is the black color developing unit. Try removing and reinserting the black developing unit. If that doesn't work, probably need to replace the developing unit. Hope that helps.