Nitro Ground Shaker
Bally, 1980I'm working on a Nitro Ground Shaker and I'm having some trouble with the sound. Sometimes, I'll turn the machine on and get no sound, other times I turn it on and get sound. Sometimes, if I have no sound and I turn it off and back on, the sound will work. Other times, this doesn't work. I haven't been able to notice a consistent pattern or anything.
Does anyone have any thoughts about what might cause this type of issue?
There isn't much to that board.
Reseat the socketed chips.
Look at the back for fractured solder joints.
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So I reseated the chips and reflowed the sockets and header. The sound worked maybe 4 out of the 5 times I turned it on.
Next up Im going to check the cpu board connector, but I may have already reflowed them when I had that board out a couple weeks ago. Cant hurt to check again though.
Quoted from pinballplusMN:Could be bad connectors between cpu and sound board as well.
I removed the mpu and reflowed all the connectors, there doesn't seem to be any change. If I turn it off and then back on right away, it seems to be pretty consistent with getting it to work.
There is a reset circuit on the board that can cause the unreliable start up. Check the schematic, can’t remember exactly but it is a 16 pin IC, a diode and a million ohm resistor. One of these components might be flaky.
I have this issue on my Flash Gordon though it is no where near as frequent. Perhaps 1 out of 20 start ups, it happens.
Quoted from jj44114:There is a reset circuit on the board that can cause the unreliable start up. Check the schematic, can’t remember exactly but it is a 16 pin IC, a diode and a million ohm resistor. One of these components might be flaky.
What board? The sound board?
Quoted from jj44114:There is a reset circuit on the board that can cause the unreliable start up. Check the schematic, can’t remember exactly but it is a 16 pin IC, a diode and a million ohm resistor. One of these components might be flaky.
Thanks, I'll try and look into this.
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Chesterfield, MO