What's the matter that the prompt doesn't sound when mahjong machine's palette is colored?

The reason why the prompt sound doesn't sound when mahjong machine palette is colored is that the motor of the operation panel itself is damaged or the connecting wire falls off. Once the motor of mahjong machine operation panel is damaged, it can't be connected to the machine, so it naturally won't ring. It is necessary to replace the motor or replace the motor connection. Mahjong machine's working principle is that the cards with the back facing upwards are attracted by the magnetic ring on the shuffling bucket, and are sent to the conveying trough along with the rotation of the magnetic ring, pushed into the pier by the folding motor at the machine head, and pushed away by the chain bar, while the cards with non-magnetic front face continue to rotate on the tray (single-mouth machine principle), which has been upgraded to a four-mouth machine.