Just before the new year I went out to a customer that called and said the machine has a C7901 (Drum unit K EEPROM error). So I went out taking a DK-8550 drum unit just in case.
When I arrived I did a C0906, no change. I then swapped the cyan drum with the black drum to see if the problem followed the drum, no change. I swapped the drums back and then tried the drum I brought, no change. I left the new drum in the machine and backed up the settings with U917. I then flashed the machine with the lasted firmware. When it rebooted, C7901. I then reinitialized the machine (U021), no change upon reboot. I examined and re-seated (where I could) the connections on the drum relay PCB, feed image PCB, engine PCB, and main PCB. Rebooted the machine, no change.
At this point, I had the machine brought into the shop leaving a loaner 3552ci in its place. In the shop I have swapped out the drum relay PCB, feed image PCB, engine PCB with another working machine. All with out change. I have taken the PCBs I have removed and put them into the donor machine and that machine works just fine. I also tried swapping the black developer unit as well as the transfer belt and that resulted in no change of state. But those units work fine in the donor machine.
Finally (and most importantly) I kicked the stand of this machine but that resulted in no change as well.
I did contact Kyocera early on in this process and they just wanted me to replace the PCBs I have already replaced.
Any help with this would be appreciated.
When I arrived I did a C0906, no change. I then swapped the cyan drum with the black drum to see if the problem followed the drum, no change. I swapped the drums back and then tried the drum I brought, no change. I left the new drum in the machine and backed up the settings with U917. I then flashed the machine with the lasted firmware. When it rebooted, C7901. I then reinitialized the machine (U021), no change upon reboot. I examined and re-seated (where I could) the connections on the drum relay PCB, feed image PCB, engine PCB, and main PCB. Rebooted the machine, no change.
At this point, I had the machine brought into the shop leaving a loaner 3552ci in its place. In the shop I have swapped out the drum relay PCB, feed image PCB, engine PCB with another working machine. All with out change. I have taken the PCBs I have removed and put them into the donor machine and that machine works just fine. I also tried swapping the black developer unit as well as the transfer belt and that resulted in no change of state. But those units work fine in the donor machine.
Finally (and most importantly) I kicked the stand of this machine but that resulted in no change as well.
I did contact Kyocera early on in this process and they just wanted me to replace the PCBs I have already replaced.
Any help with this would be appreciated.
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