After the machine has been used for a long time, the transmission belt of the mixing system may be elongated and needs to be adjusted. The phenomenon occurs when the belt slips and the machine stops suddenly after a while. The "NL" will be displayed on the digital tube of the soft ice cream machine of Dongbei series. The buzzer sounds a long and regular intermittent sound. At this time, disconnect the power supply, remove the left side panel of the machine, and use a wrench to adjust the screws fixed under the motor. (The specific conditions vary slightly depending on the machine model. Please call the after-sales phone for consultation. In case of this situation, the machine is not faulty. The belt must be shut down before the belt is adjusted. The belt is adjusted to be tight and the machine returns to normal.