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This code is for LCT (Large Capacity Tray) lock release failure. This means there is a problem with the LCT, usually the large paper drawer at the bottom. This code is usually reset by opening then closing the front door. Sometimes turning off then on the main power switch on the right side will clear it. Try releasing the LCT and get it open. Then check the paper in the tray. Most of the time when there are problems with these LCT's it is because too much paper has been loaded or it has been loaded improperly. If you get it open, remove all paper. Then load smaller amounts of paper at a time to insure that it is loaded perfectly. Only load the tray half full at first and then close the drawer and allow it to lift. Then make a copy from that drawer to be sure it feeds paper. Then release the drawer again and finish loading if you want. If you continue to have the code then you can leave the drawer open an inch or so to de-activate it so you can still use the printer from the other drawers until you can get a technician out ot service it.
Good Luck and Thank You for using Fixya.
according to what I read on the C450 biz hub, in order to do OCR you
need to use the option that scans to SMB, that sends the scanned
documents to your computer on the network. You can then process
the documents on your computer with the OCR software program so you can
edit the finished documents. I did not see anything that
indicated the Bizhub had OCR software capabilities built into the
unit. Regards, rcampsr
U4 code refers to a fuser heat failure, you'll probable find the fuser roll is stone cold .Possible cause is open circuit heater or overheat thermostat popped.Either way you will need to pull out the fuser unit and check continuity of the components