A Case of Happy Pitching Machine Repair
Happy Pitching is a new machine from Huali Company. It uses a large-screen flat-panel TV, providing an open view. Players can fully relieve stress and have fun during the game without too many requirements. The machine uses screen optical path detection. When the player's plastic ball blocks the optical path, horizontal and vertical coordinates are generated, allowing the machine to know the ball's landing point. The picture changes accordingly, generating scoring and success/failure judgments.
Today, I will introduce a problem encountered in actual repairs.
Fault Phenomenon: After inserting coins and pressing start, no balls come out of the ball outlet, making the game unplayable.
Fault Analysis: When the inserted coins reach the set value, press the start button. The plastic balls are conveyed by the conveyor belt to the ball tray. When the ball blocks the full-ball optical sensor, the conveyance stops. If it is not blocked, the conveyance continues. At the same time, the player hits the screen with the plastic ball, and the ball falls into the receiving tray, repeating this cycle until the game is completed. The failure to dispense balls could be due to the motor not being driven or the motor being jammed. If there are other related feedback control circuits, then the relevant control circuits are also key to diagnosis. After analyzing the machine and entering the test state, the motor can rotate forward and backward, and the ball outlet optical sensor prompt is normal. The repair seems to hit a roadblock. Further analysis shows that if the full-ball optical sensor thinks the balls are full, it wouldn't dispense balls either. Removing the front panel and unplugging the optical sensor receiver head connector allows the game to dispense balls, proving the fault is in the receiver head. Analyzing the receiver head circuit, it is actually a three-pin infrared receiver head with a buffer stage added. Pulling up and down on the output pin of the infrared receiver head causes potential changes in the buffer stage output. Now, the fault has been proven to be an issue with the infrared receiver and transmitter. To simplify the repair, directly replace the corresponding part with an infrared phototube. (From: Game Machine Repair Network)
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