Description: incorrect scanner speed and is generally the same as an error 51.
Code: 55
Display: 55
Description: Check the connectors on the DC controller and power supply. If you don't hear the motor immediately and you don't have a paper jam, change the power supply.
Code: 57
Display: 57
Description: Error 57-1 Incompatible memory can be either top or bottom slot. Also check motor cable connections. Replace main motor. Can also be DC controller.