Https://www.youtube.com/watch?v=GAolnpKK3yM
The most likely cause for the motor to speed up and slow down is a dry or worn walking belt or walking board. Lift the walking belt and feel underneath for worn spots on the board. ... This mode also allows the technician to calibrate the speed and incline of the treadmill whenever a major electrical component is replaced.
SOURCE: Cybex 530t treadmill speed slows down intermittently anyone help
Please LUBE deck belt + rollers bearing too
2) test the input voltage motor, if there are the motor need repair.
3) test the output voltage board, for input voltage motor, if there are NOT the board is faulty.
God bless you
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