(Topic ID: 254291)

Bally 2518-51 intermittent sound


By shaub

27 days ago



Topic Stats

  • 12 posts
  • 5 Pinsiders participating
  • Latest reply 13 days ago by jj44114
  • No one calls this topic a favorite

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#1 27 days ago

I'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?

#2 27 days ago

There isn't much to that board.
Reseat the socketed chips.
Look at the back for fractured solder joints.
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#3 26 days ago

Could be bad connectors between cpu and sound board as well.

#4 26 days ago

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.

1 week later
#5 14 days ago
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.

#6 14 days ago

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.

#7 14 days ago

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?

#8 14 days ago

Yes, but the -51 board. FG probably has the Squawk & Talk board. it also has a reset circuit. The schematic would be helpful, but I know there is one cap that can cause this on the S & T board. I think its C1. 47uf electrolytic cap.

#9 14 days ago

Ah. Thanks.

#10 14 days ago
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.

#11 13 days ago

What does a reset circuit do, just for my own education?

#12 13 days ago

A power-on reset (PoR) is a circuit that provides a predictable, regulated voltage to a microprocessor or microcontroller with the initial application of power. The PoR system ensures that the microprocessor or microcontroller will start in the same condition every time that it is powered up.

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