(Topic ID: 27163)

Noob with a sound problem on high speed

By jcar302

6 years ago

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  • 24 posts
  • 6 Pinsiders participating
  • Latest reply 6 years ago by jcar302
  • Topic is favorited by 1 Pinsider


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#1 6 years ago

Hey guys, bought my first pinball.
Williams high speed.
Mediocre shape, but i didn't pay that much.
It was missing the shooter and spring and i was told the sound didn't work.
Tested it on site and it was too loud to hear anything, so i figure that it didn't work as said.

Get it home and manually sling shot the ball and everything seems to play fine.

But the sound effects do work with volume on full blast, but they can only faintly be heard, any backround noise at all and you can't hear them.

In attract, i can't tell whether it's the speaker buzzing eractically or it's sound.
The siren does spin though after a certain amount of time.

It's been a longggggggggg time since i've played this game, so i don't really remember what the sounds should be.

I have a few arcade games, but have no prior experience working on a pin.

After about a million searches, i came up with a few possible answers. One was to check all the connections, which i did.
Two appears to be an issue with the roms or chips.

If it is one of the chips, where do i get replacements?
While i'm mechanically inclined (licensed electrical contractor), i'd rather not take part in soldering anything on what appears to be an expensive board, but if they are plug and play and are inexpensive, i'd be willing to try that.

I'd like to try and rule out a mechanical issue first (mechanical meaning, connections etc), so i don't go sending a board out for a repair that isn't needed.

If i did need to send it out, where do i send it that is well respected?

I don't mind projects and spending a few bucks on fixing things, as i said i think i got the game pretty cheap based on the owner needing it gone asap. Also the place that sold it to me said their repair guy said it was an easy fix and was one of the chips.
Regardless, i based my purchase price on needing a replacement board.

Thanks for any input.

#2 6 years ago

Check all the ground straps and make sure they are there and not cut

#3 6 years ago

If you are getting the correct sounds, it likely isn't the Roms. Often times, the volume POT is no good. The wiper inside corrodes or deteriorates over time. On High Speed, I believe it's a 5K pot (some system 11's had 10K pots plus a 50 ohm resistor). Put your meter on OHMS on the pot's two legs and see if you are getting any variation in ohms when you turn the pot. If not, then go to Radio Shack and get a 5K audio pot and replace it.

#4 6 years ago

Ok thanks guys.
I checked continuity on all grounds and it would appear pretty much every piece of metal on this thing is grounded.

For the volume pot, the ohm reading clearly changes as i turn the dial.
BUT, now that i have it in the my quiet basement (my garage light buzzes), i realize the volume stays exactly the same regardless of where i have the dial, all the way up and down sounds exactly the same.

Another thing, after closer listening, it does not appear that any actual sound takes place during attract mode, i never hear any music or voices at any time either.
I'm guessing the volume pot is cheap, so maybe i'll just buy another anyway.

If it helps, the place i got it said it was out on the floor working then they removed it because the sound stopped.

Thanks for your guys input so far.

Edit: Went to youtube to watch and listen, would appear volume is either too low to hear or my machine is missing like 80% of the sounds.

#5 6 years ago


Have you run the sound test off the board or the one from the diagnostics in the door?

#6 6 years ago

I'm new to System 11's but I do have WW which does not have attract sounds; just an end of game sound/music.

Hopefully someone can correct me, but isn't there another set of pots on the board in the backbox too? Pic below:


#7 6 years ago

Nice looking board. I'd get a remote battery holder for it ASAP.
These work great...
Or, you can roll your own.

If you "twizzle" the volume pot in the cabinet, does the "buzz" level change?
If so, your POT and amp are good.
If not, the amp may be shot...or something leading to the amp.

There is only one volume control on HS.
Chris Hibler - CARGPB #31
http://www.PinWiki.com - The Place to go for Pinball Repair Info

#8 6 years ago
Quoted from way2wyrd:

Have you run the sound test off the board or the one from the diagnostics in the door?

Thanks for the replies.

I did not run the sound test, not sure how, any suggestions?

I changed the volume pot today, same results.

I listen to the buzz, which does sound inconsistant like it's trying to play music or song, but it's really hard to tell. But there is no change in that sound when i adjust the volume control with new or old volume pot.

I was told by the seller that attract mode of this machine used to startle him with sound, so i'm guessing there is attract mode voices or music.

Thanks for all the help.

#9 6 years ago

Heres the manual

there is one sound test that is on the MPU itself.
There is another that you get to through the door diags.

There are also setting where you can adjust attract sounds i think.


#10 6 years ago

Not my board Chris lol, but you're right. So what are these I circled then? Trying to learn.... Sorry for the jump on the thread but figure it will benefit OP as well.

#11 6 years ago

On the system 11 board those are the Sound Test and MPU test.

#12 6 years ago

Ok, ran sound and music tests, no music played as far as i can tell and the sounds played faintly just like they do during a game.

#13 6 years ago

Ok, now i'm really consfused.
Starting tracing wires and the volume pot that is under the tilt ball mechanism is NOT connected to anything at all.
It's a black/red/bare inside a gray jacket, it's got a plug that runs up into the head of the machine that isn't connect and i don't see a place for it.

In reading the diagram, i see there is a single speaker system and a 2 speaker system, which is high speed? I don't see another speaker in the grill of the head.

Also, from where the sound plug goes on the board, there are 2 blacks and 2 y/b's. a pair go directly to the cabinet speaker and the other set appears to be cut.

Next, when i press the sound button on the board, faintly it replays the same sound.
When i press the other test button, it briefly shows an 8 then comes up with a code 5.

Any direction on where to go now is appreciated.

#14 6 years ago

Next update (i'm the type of guy that just keeps working on something till it's fixed).

Seller for sure lied about the issue being a "chip".
How the hell could it be a chip if things are missing and uplugged?

Appears front speaker is missing, judging by the extra speaker wires and the holes are there to hold the speaker in.

On the bright side, i took the 6 inch harness off the prongs next to where the speakers go (followed diagram) plugged the volume pot on and all sound effects work very loud and volume pot works correctly.

There is a fair hum in the backround and now i get the backround music faintly.

Both sets of speaker wires play exactly the same sounds.

And i redid the mpu test with the door open (like manual says) and goes to 8 briefly then 0, which i think is what it's supposed to do.

What to check next to get music and other missing sound?

#15 6 years ago

make sure all of the screws on your cpu board are there and tight. If they are missing or loose, it can cause a hum.

#16 6 years ago

Ok, checked all screws, hum is still there, but with the volume lower, it's really not that bad.

Still the same, all sounds from playfield work properly, like targets ramps, etc.

I can hear the music very faintly, but i don't ever hear any voices or the engine.

What size speaker goes in the back box on this thing?

Thanks for all the replies, i'm getting there.

#17 6 years ago

Well, here's one for you guys.
Called k's arcaded to see how much to have board checked out.
He tells me to check certain wires that goto the sound board, i'll let the pic speak for itself (i did NOT alter anything personally).

Hopefully the pic works, i'm not familiar with post pics how it's done on this forum.


Needless to say, bought another sound board.
Why someone that owns an arcade business would be so deceptive to someone that lives fairly local, i have no clue. Looks like more than just a "rom".
They simply could have said they harvested the sound board for another machine.
Not good business practice for sure.
Make no mistake, i'm a buyer beware type of guy, but being honest in this situation wouldn't have changed anything, i still would have bought it.
I'd rather risk selling something for a few less bucks than be known as untrustworthy.

#18 6 years ago

Yup...that'll definitely cause sound problems.
At least there is a new RD PS in there. Even though I hate the way Jim put those connectors on it.
Chris Hibler - CARGPB #31
http://www.PinWiki.com - The Place to go for Pinball Repair Info

#19 6 years ago


Easy fix at least

#20 6 years ago

Thanks guys, it was my fault for overlooking the existence of the sound board. At least i properly titled the post "noob".

When i get the board and install it i'll make a post and let you guys know how it works out.

Any info on what type of speaker goes in this back box.

#21 6 years ago

Ok guys, installed the sound board this weekend (took about a minute), music now plays fine.

But i'm still missing some of the sounds for the game, after watching some youtube videos it appears i'm still missing the car sounds like the engine and the wheel screeching.

As is cycles through the sound test, there are a few that are blank, meaning that on certain numbers it doesn't make a sound.
I also tried connecting the second speaker wires, they still make the same sounds.

What to do next?


#22 6 years ago

These might help:



I would first suspect the Sound ROMs, but there may be other IC's involved

#23 6 years ago
Quoted from robertmee:

These might help:
I would first suspect the Sound ROMs, but there may be other IC's involved

Thanks for the link, alot of good reading there.

Most of my reading led to the sound roms too and they appear to be plug and play, so i think i'll just get a set and start there, they don't seem to cost too much.

3 weeks later
#24 6 years ago

Well, turns out my board was/is pretty hacked up.
K's has it for repair, so i bought another.
Got an 11a that was already setup for high speed with rev 2 roms.

Made a world of difference.
Now all my sounds and music work, my displays now work (except one segment on the ball count, but i think that is a physical display problem) and so does my pop bumper that i rebuilt.

You really don't realize how hacked up a board has been until you have a nice one in your hand.

Not sure if it was board damage or revisions, but the game appears to play a bit different when it comes to where it holds the balls for multiball.

I also put in some playfield leds (i wanted the ones that go under the playfield plastics, but i mixed up the terms), a couple new flipper pawls and shaft bushings (flippers where slipping) and all new rubber.

Seriously what a difference, all the minor repairs really change how the game is played.

Thanks for any help.

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