I have a 307ci that reds are printing orange. After talking to Kyo help desk and replacing magenta developer, transfer belt, and hv pwb, they said to replace dev/drum relay pwb. There are no instructions in the service manual as to how to replace this part that I can find, so I decided to dig in and try to figure it out myself. After not succeeding in replacing it I decided to start putting the machine back together before I (A. lost a part or screw, or B. forgot how it went back together). Got the entire machine back together and had a bit of trouble putting the black drum back in but eventually got it. Fire up the machine only to get this error C7901 Drum unit K EEPROM error. Tried a new drum, no luck, so now I'm back to replacing the dev/drum relay pwb. Anyone have insight on replacing the dev/drum relay pwb?
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