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This is the central indicate board of the "Hokuto no ken" made by Sammy Co.Ltd.
Let's search where is GND.
We pay attention to the payout switch.
The circuit of the Slot machine is the digital circuit.
The one side terminal of the payout switch is connected to GND.
We are not able to know which is GND yet.
We assume that the A-side is GND.
We set the Digital tester on the conduction mode（Ω/・|||).
And we fix the black electrode of the digital tester to A-side.
We confirm the conduction by touching the red terminal of the digital tester to the medal selector 8 pins one by one.
When we will not be able to find the connecting point it is the evidence that the assumption we thought was a mistake.
We change the terminal to the opposite side and fix the black electrode of the digital tester. We confirm again one by one.
We were able to know the fifth and eighth terminal from the left side of the medal selector are GND.
Let's search the other part of the slot machine in the same way.
We are able to confirm the brown color code of the 20Pin of the power supply box is GND.
Next, we set to the DC voltage mode(
) and turn on the power supply.
We fix the black electrode on the GND and measure the voltage every place.
The orange color code of the 20Pin of the power supply box is DC24V.
It is an important discovery for us.
We connect the 24 voltage and GND to the amusement specification board by parallel.
The amusement board has not electric supply.
DC24V decreases to 12 voltage in the amusement specification board, and it is changed to 5V.
It is used to control the microcomputer.
related information
回胴式遊戯機技術研究会はパチスロの入出力信号を調べて、オシロスコープで波形をみて、その通りの疑似信号を出力するマイコンプログラムを作成して、回路にのせて、パチスロのメダル不要回路を作成して、卒業の技術講習(有料）を開講しています。
この機会に、パチスロの基礎から学んで、アミューズメント仕様パチスロの技術を身につけてみませんか？
受講受付中！！
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