E751, 1301 means there is an issue with the toner system. The machine is checking for the presence of toner. After 3 attempts the machine will go into the error. In this case, the yellow toner tube needed to be replaced even though the machine did not indicate to do so. The color that is causing the issue is the first digit in the sub code.
Color Copier Canon ImageRunner C3220, Canon's true definition of multifunction has been met. should find all on here x
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