On the Roland SP-300v it means 'scan motor overcurrent error 2' which means a small load has been put on the scan motor over a long period. Could be a problem with your roll feed jamming or putting too big a roll on the machine.
I think you're stating two different problems. Feed has nothing to do with scan motor overcurrent.
How long was the printer running when yo got the error code? If you were running a long job, it may have put an excessive duty cycle on the scan motor. Depending how old the printer is and to what capacity it gets used, the motor might be getting weak.
There's actually two scan motor overcurrent errors. 1 & 2. 0040 [ big load] 0080 [small load] The big load usually means a media jam where the head gets stuck . This overloads the motor current causing the machine to alarm and the code 0040 shows up on the menu.
Here's the list of possible problems:
1, There's a bad contact/cut-line in the cable
2, Screw fixing the tool carriage to wire is shifted
3, Motor is broken/Life
4, Head/Servo Board is broken
Just for the record, the feed motor error is 0004 and 0008.
Hope this helps
Dave