(Topic ID: 211910)

Wild Fyre Sound on Start Up


By oldschoolbob

2 years ago



Topic Stats

  • 11 posts
  • 4 Pinsiders participating
  • Latest reply 2 years ago by JT-Pinball
  • Topic is favorited by 2 Pinsiders

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#1 2 years ago

I got my Wild Fyre all working great now. The only thing I don't like is the annoying sound when I turn it on.

Quoted from mbwalker:

The sound it makes when turning...mine does the same thing. I looked it up when I first bought it and apparently it is normal. I've even seen soundboard mods to stop it, but it doesn't really bother me. Someone said that Stern said that was a 'feature' to alert an owner someone was tinkering with a game.

Is there an easy way to get rid of that sound?

Thanks

Bob

#2 2 years ago

Which revision sound board have you got? Can you post a clear picture of it?

#3 2 years ago

I found a photo of the board before I re-installed it. I'm guessing it's a rev A because the sticker says "A".

I also found this service bulletin but I'm not sure it's related to the sound on startup.

And I found an old post from Pinside that is related but the OP never said he fixed the problem.

https://pinside.com/pinball/forum/topic/classic-stern-god-awful-screech-on-power-up

Bob

sb1 (resized).PNG

IMG_1098 (resized).JPG

#4 2 years ago

Yes, that mod will likely fix the issue.

The amplifier chips on these sound boards is wired to be muted at power up. The rev "A" boards are muted via the MPU reset line. Problem is reset is released within a few milliseconds on power up, which un-mutes the amplifier chips too quickly. Any spurious sounds that were activated at power-on are then allowed to play out.

That modification essentially changes the mute activation circuit so it doesn't use the MPU reset line, rather it uses a simple resistor/capacitor network as a time delay who's period is much longer allowing the board to be muted longer on power up.

I'm not a fan of cutting wire 25 on the interconnect cable. I'd try to find an elegant way of disconnecting the signal from pin 25 on the J1 connector on the sound board (if that signal leads to a jumper, then disconnect that jumper). I don't have a SB100 handy to check.

#5 2 years ago

I didn't want to remove the board until I was ready to do the mod. So I checked my inventory first. Sure enough, I don't have a 3.3uF capacitor or 47K resistor. Nothing even close. So I ordered the resistor from GPE but he doesn't have a 3.3uF cap - but I understand 4.7uF will work. I ordered that instead. Unfortunately, he's on vacation so it'll be a few weeks before I get my parts.

I'll let you know when the parts arrive. Meanwhile maybe I'll just mess with the oscilloscope and that old MPU. Maybe I'll learn something.

Thanks

Bob

#6 2 years ago
Quoted from oldschoolbob:

it'll be a few weeks before I get my parts.

No hobby electronic stores in your area? Got any old transistor radios/other scrap circuit boards you can take parts from?

#7 2 years ago

Closest electronics store is on the other side of St. Louis. About 40 miles one way. If it was keeping the game from playing I would make the trip but it's just an annoying sound on start up. I can live with that for a while.

Besides, I think I have a Williams Black-Out coming this week. That will keep me busy (and happy) for a while.

Bob

1 week later
#8 2 years ago

My Stern Dracula makes an awfull noise too at startup. Could this service bulletin be a solution for me?

#9 2 years ago

The same bulletin is listed on the Dracula game. Wild Fyre was made in 10/78 - Dracula was made in 1/79.

#10 2 years ago
Quoted from EvilEddo:

My Stern Dracula makes an awfull noise too at startup. Could this service bulletin be a solution for me?

Your problem is different - you're not getting normal tone sounds at startup or during game.
Seems to me you likely have poor ribbon cable connections at the MPU and/or sound board side.

#11 2 years ago
Quoted from Quench:

Your problem is different - you are not getting normal tone sounds at startup or during game.
Seems to me you likely have poor ribbon cable connections at the MPU and/or sound board side.

+1 here. Put the game in solenoid test. Dose it make the all the correct sounds when solenoids 20-25 fire? If not, try to reseat the ribbon cable. Could just be a crappy connector on the MPU or Sound board.

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