Bizhub 420 error C-2403

[Will]

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A lot of times,I have had this problem,and all the times I only clean de PS 28 (toner bottle position) with a vacuum cleaner...and problem solved...

Of course you could have a damage sensor or a fault in the PRCB

good luck

Thanks, but I already replaced both PS28 and the PRCB. The sensor or PRCB I think is ok cause I can get it to turn intermittently in service mode.