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All Cob codes on this series of Minolta copiers pertain to the sorter. Most all of the time you can simply open and close the sorter to reset the code. By open and then close I mean that the sorter must be pulled away from the copier then closed back.
Make sure there is nothing interfering with the movement of the sorter bins.
If opening/closing does not reset the code or if the code comes right back after resetting then the sorter will need service as dis-assembly/repair/re-assembly will be required. You can also unplug the large connector going from the sorter to the machine and use the copier without the sorter. If you have a 10 bin sorter that "hangs" from the side of the machine then you can leave the sorter attached and it will work fine unplugged. If you have the 20 bin sorter that sits on the floor then the sorter will have to be moved away from the copier if unplugged to prevent the machine from jamming. If you unplug the sorter be sure to turn the copiers power off before disconnecting the sorter.
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All COB codes no matter the number are sorter error codes. You must open then close the sorter in order to clear this code. By opening and closing I mean you need to pull the sorter away from the copier then close it back.
This 20 bin sorter uses an interlock switch and actuator to show that the sorter is properly attached to the machine. Pull the sorter away from the machine and look at the rear side of the copier that faces the sorter. There should be what looks like a spike mounted to the copier. That spike goes into a hole in the sorter which then actuals the switch. Make sure the spike is not broken or loose. Make sure the tray that the sorter sits on is not bent. Correct any issues with these 2 and you should be good to go.
Code COb31 means that the sorter didn't reset after a job. If you try doing a reset by opening the sorter as if there was a paper jam and it doesn't reset, it means that you have a problem with the sensors by the motor that turns the bins to open and clause as the paper passes. Give it a good blow with air. GOOD LUCK.