Any info about how this error is triggered, or even better, how to resolve it would be appreciated. I have already performed all the steps listed by HP at: HP Color LaserJet CP2020, CM2320, M351, M375, M451 and M475 MFP Product Series - Remove Shipping Lock error message on control panel - c01760760 - HP Business Support Center without any resolution. The tech that works for my HP parts distributor was pretty sure replacing the DC Controller PCB would solve it, but it has not. I have even removed the end of the toner cartridge where the HV contacts are (this worked for another user in this forum) and reinstalled it again to no avail. I have two brand new black cartridges and both produce the same error.
I have called HP tech support, but since I no longer work for an authorized warranty station, I get the end user support from India who have not been any help.
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