D-203 can be caused by dry scanner rails, remove the original glass and clean and then oil the scanner rails on both sides. Also sometimes your CF card cab be corrupted. A C-2403 is a dirty toner bottle detection sensor, remove the toner bottle and clean inside the housing, the sensor is way at the back on the top left side.
SOURCE: Our KonicaMinolta Bizhub C280 Internal Error C2555
You didn't mention the size of the job size, but it sounds like a memory problem. If you have a service contract or it's still under warranty, contact your rep before you start opening things up.
The following is if you don't have a service contract. If the bizhub has been working with no problems in the past, try reseating or replacing the RAM. I've had to replace RAM that started causing problems on classroom computers. If you bought it refurbished (used) check to see the 2GB RAM that supposed to come with the bizhub hasn't been removed or replaced with smaller memory.
SOURCE: what does error code C-2403 indicate on bizhub 421 Konica A-4403
Click Here or difinition and possiable fix for C-2403 error code.
SOURCE: How to make nvram recovery
You'll need:
1- 1 compatible CompactFlash card (not all of them work, you'll need to try for yourself)
1- 1 CompactFlash card reader/writer
1- This tool
There should be a document enclosed with that tool explaining the process, it's fairly easy and quick. Notice that the procedure will solve some NVRAM related problems and also some network card related problems, but it will not erase your counters.
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konica Minolta bizhub error c-d203 error
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