Video Game Console Repair Questions? Ask a Technician ASAP
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What is the alarm exactly? where does it show up?
Slot machines aren't simple inside. They can have a lot of different things go wrong with them. For this brand, information is not readily available... you may have to contact the manufacturer, Konami, and ask them for help, unfortunately.
But tell me a little more about the situation, what the error code is exactly, and where it shows up.