Greetings all. I have a 4501i giving a C7301 error.Checked toner hopper unit motor and developer unit in Maintenance Mode , all was well.I tried original developer unit and toner hopper unit in a working machine and no issues.I replaced toner hopper unit, Front PWB as suggested by Service Manual. No joy. The next step is the Engine PWB. Need some advice as to what else should I check before replacing Engine PWB.
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