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The error code E020 refers to a density problem with one of the Drum Units. The sub-code 03b0 refers to one specific Drum Unit, of which I'm not sure. I believe if you go into service mode and check Density, you'll see each Drum Unit listed there. You are looking for an average Density reading of +-2.5 for the Units. Don't get crazy trying to reach that value, but look to see which one is way off and that may be your culprit. Or maybe one of these other guys may be able to tell you which unit the sub-code is pointing to.
This error indicates that it cant detect the scanner unit of IRC3220
Check the cable that connect the machine and scanner unit .switch off the machine disconnect the cable and reconnect it and switch on the machine again hope this will help
im assuming your talking about the upper roller in the fuser? if so you need to take the unit out 2 silver screws on top looking back at you. and replace the unit try ebay. those rollers are very difficult to do
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