Williams System 3 Type 1 Sound Board problem notes

(Topic ID: 190096)

Williams System 3 Type 1 Sound Board problem notes

By hailrazer

1 year ago

Topic Stats

  • 2 posts
  • 1 Pinsider participating
  • Latest reply 1 year ago by hailrazer
  • Topic is favorited by 1 Pinsider


Linked Games

#1 1 year ago

Just posting for the sake of anyone in the future with the same problem.

I have a Williams World Cup. System 3 Type 1 Sound board.

It was working fine then no sound at all. Replaced all caps. Sound came back but then went out again and now a loud hum. Now no sound even when pressing test switch.
Replaced the Pia. No change. Replaced the Sound Prom with an Eprom and did the board mods so it could use a 2716 eprom (Jumpers, 10k resistors, etc). No change.

Replaced the Cpu. We have sound back but with a hum that get's louder over time. Eventually sound stops working again.

Put back in old Prom and put board back to the way it was. No change.

Replaced buffers (MOTOROLA MC14050BCP), sound is back and hum is totally gone.............................for now

#2 1 year ago

Well hum came back. As it heated up the hum would get a little louder. Used cold spray and found the 7805 at fault.
Replaced it and no hum for over 3 hours.

Promoted items from the Pinside Marketplace
From: $ 9.00
$ 104.00
$ 89.00
Pappy's Pinball Palace
$ 7.00
APB Enterprises
$ 48.00
Cabinet - Other
ModFather Pinball Mods
$ 29.99
Cabinet - Sound/Speakers
Lighted Pinball Mods
$ 59.99
$ 27.99
Lighting - Interactive
Lee's Parts
$ 46.95
Cabinet - Shooter Rods
Super Skill Shot Shop
From: $ 7.00
$ 107.95
Lighting - Other
€ 222.00
Cabinet - Decals
From: $ 49.99
Playfield - Toys/Add-ons
Medisinyl Mods
$ 8,500.00
Pinball Machine
PinballSTAR Amusements
$ 129.95
Cabinet - Shooter Rods
Super Skill Shot Shop
$ 39.95
€ 85.00
From: $ 99.99
Cabinet - Other
Lighted Pinball Mods
$ 44.99
Lighting - Interactive
Lee's Parts
$ 14.00
Cabinet - Decals
ModFather Pinball Mods

Hey there! Got a moment?

Great to see you're enjoying Pinside! Did you know Pinside is able to run thanks to donations from our visitors? Please donate to Pinside, support the site and get anext to your username to show for it! Donate to Pinside