I'm troubleshooting a reel controller board for an IGT slot machine. The digital section seems to be dead. There is no USB communication, PC or utility program for flashing firmware do not see it but they do see good/working boards. I noticed the waveform on the crystal is very erratic/asymmetrical/glitchy on the bad one compared to the nice even waveform on a good board. My question is would this most likely be caused by a bad crystal or something gone bad in the circuit loading it down? I'm attaching a couple pictures of my scope probing the good and bad boads.
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adjust the timebase on the scope to see less waves but in more detail.
but crystals do degrade,
i often change them on old amusement gear - i like to change the small ceramics too - incase they are the cause.
it's probably not usb, just using usb cables to save money - sega does that and uses usb cables for RS485 serial comms.
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Yesterday I swapped crystals with a working board, got a nice clean waveform but the board still doesn't work. I then put the crystal from the bad board onto the good board and also have a nice clean waveform and that board still works as well. Maybe I had a bad ground or something?
Also at my work I only have an old 20mhz scope. I've been here 22 years and it was here when I started. I don't really use a scope often enough to budget for a new one. I also have a Fluke 97 scope meter rated at 50mhz so that gives me a little more detail.Last edited by Keshenatech1; 02-27-2024, 09:20 AM.Comment
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fluke 97 is nice when you can see it, those EL backlights are crap.
i have a 97 put away - it was my first scope
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