Hi, I am repairing the above MC-70 treadmill bd. It has a burned DZ4. I have not removed DZ1 to check it yet. Also R68 measures 550 Ohms. Is it supposed to be 1K Ohms like R57? The writing looks like it should be 1K also. Does these units usually work if you replace DZ1 and R68? Should I also replace DZ1 as a precaution and should these be an upgraded, higher current component? Is there usually another problem causing these components to go bad?
Thanks you,
Tim