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The c-d403 code indicates a checksum error. Try turning the copier off and on via the Main power switch either behind the copier or inside the front door of the copier. Checksum error along with no operation panel means something could be fried on the main board.
The error code means that the finisher bins could not find HP. The problem shows up when something is placed under the bins and stops them from moving down, most of the time a "G" file or a case of paper. Move the object and move the bottom bin up till you hear it click. Before doing that make sure the MAIN Power Switch is OFF on the right side of copier... Then turn the copier back ON and it should clear it self.. Good Luck
Error code 5100 /this error is an error within the printer. This error means that there is
something obstructing the printing process. Check inside your printer through the gears that
you can see under the lid. There should be something obstructing the gears such as dirt or
in my case popcorn. Check VERY thoroughly.