New Life Games LLC
**Reel Slots** Gaming Machines => IGT S and S-plus Reel Games => Topic started by: kmarrocco on March 13, 2022, 06:22:10 PM
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Good evening. I have an IGT S Plus upright machine that plays fine but there is nothing displayed on the 7 segment displays (coins played, winner paid, credit meter). Any ideas on which connections to check? Both connectors to the display board seem to be plugged in. I have removed them and reseated them both. Thanks for the help.
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I was looking at the attached page from the service manual. So I tried putting a known good MPU into the machine. As soon as I turned it on the MPU board started smoking. Q1 was fried. Then I looked at the MPU board that was originally in the machine and realized it had similar damage. From what I can tell, this is circuit that drives the bet max button light. Any ideas on what to check next?
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Does the Bet Max button have a LED light in it? Some LEDs/socket combinations will cause a direct short from and fry things. Usually it's the denomination LED that causes the most problems, but it's worth looking into.
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No, it is not an LED bulb.
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OK. Well like you said Q1 drives the BET MAX lamp so there must be a short somewhere in that circuit in order to burn it up like that. Check the switch wiring.
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I had similar problems with my S+. First have you checked the fuses? I traced a bad "spin button" by a continuity test. Use alligator clips on the MPU plug of the wires you have traced back from the switch (Probably Green/Green & Yellow/Black). If you get a tone on your meter when you are depressing the switch, it is good. Another suspect cause is the optic switch and optic switch receiver. A third cause (epically if you have smoked a board) is loose coins under or behind the MPU or planeboard if the machine was laid on it's back during or before transport. Good luck.