MP 5500-sc300

[aabarnes1]

Re-occurring code comes up, changed the main charge unit then changed the power unit for main charge, still coming up intermittently, your help would be appreciated, thanx

[RG1964]

Did you try a new drum? (what is the age of the drum at this moment)
Is proces control increasing the charge current? (check SMC)

[stephend]

Re-occurring code comes up, changed the main charge unit then changed the power unit for main charge, still coming up intermittently, your help would be appreciated, thanx

Did you changed the corona unit and the endblock as a set or just the corona unit? Also, if you replaced the HVPS for corona a good idea will be to check again the harness and reseat all the connectors. The last on my list will be the IOB if everything else didn't help. Good luck.