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You cannot repair this error easily. Most times its the main board that has the problem but its more than likely to be the scanner pcb than the main board. I am actually in the middle of the very same error and have tried the main board and it is the scanner pcb that is causing this particular problem. As you do not state what model you have , I cannot give you a part number.
sc547 is a power supply error that can mean you have a faulty power supply. The service manual does not list an sc689, and it's not in the help desk support database either... are you sure that's the code that comes on the screen?