This is a c550 or c650 model. HV1 will be here Monday. I changed this out last year at this time (same issue) and did not change anything. SSD had me change the prcb, HV1, clean and check every contact for the iu's, ohm the harness, recheck the connections on the hv1, flash the machine (only one version back at the time). After all this I replaced the transfer belt unit and the iu at the same time. This fixed it for over 8 months. Then the iu needed to be replaced and now it is back again.
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