Two: The vehicle is running. Eliminate circuit problems.

1: Check if the belt is loose, turn on the vehicle, push it with the car to see if there is any gap.

2: There is no fixed running position for running the pattern. Turn off the vehicle to push the frame, whether there is a feeling of pause, and use sound to judge where the vehicle problem is.

3: Run the pattern to fix the running position, and the frame is hit on which one, the general condition is the platen screw. Or use the above method to solve it.

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