(Topic ID: 169450)

High Speed - No AUX sound at all

By sneakerpin

7 years ago



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#1 7 years ago

Hello,

Just picked up a High Speed.

This is one of two immediate issues.

Background info:

CPU board has acid damage only at the battery terminals.
Score display driver board has one burnt trace, and not in the machine ATM.
All score displays unplugged.
All playfield lights, switches and solenoids are OK, All tilt/slam switches OK. Flipper driver OK.
Fuses are all good.

The CPU does work, I can execute a perfect startup sequence and play a full game.

When I play a game, everything except the AUX sound (and score display, but I'm working on that) works. When I mean AUX sound, I'm talking about the speech, playfield reaction sounds/scoring sounds.

The music plays fine.

The AUX sound driver board looks OK to my eyes, all connectors have been popped off and re seated. I carefully checked for pin 1 alignment on the CPU board ribbon cable. The ROM is there and the two socketed chips were carefully pulled and re-seated.

If you have any hints, please pass them along!

Thanks,

Tim

#3 7 years ago

@Bhieken, I paid a lot more than the asking price, FWIW. This was on my top 3 most wanted! Come and play it when I fix it!

Cheers,

Tim

#5 7 years ago

UPDATE

Hello Everyone,

The sounds that do not work are on the CPU board if I'm not mistaken.

After successful power up (attract mode), I press the SW-1 sound test switch and nothing happens.

Music plays just fine, but I believe that is a separate sound board.

Tim

#8 7 years ago

OK, thanks guys.

After some discussion with Keith over at K's, I am bringing the board in for a check up. I attached the pictures of the acid damage, it looks mild in comparison to some boards that I have seen. Holding the board up to light, and those fine traces under the battery holder look great. The corrosion appears to be confined to the area in the photo, the chips all have shiny legs. I'm very optimistic...

I hope the fix is simple. If we can repair it, I'll put NVRAM on it as well.

The audio amplifier works, and the board passes it's POST and goes into attract. I used service mode to test all playfield lamps and coils, everything checks out. Just no game sounds or speech. Weird.

I'll keep you posted. Feel free to comment on the acid damage, it's foreign to me other than it's bad to have...

Thanks everyone,

Tim

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