Donkey kong: Wahwahwah sound

MrSinister

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Donor 9 years: 2015-2022, 2024
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My Donkey Kong during attract will make the wahwahwah sound. It stops during game play. I have followed mike arcades repair guide on it and replaced the transistors at Q4 and Q6 with no luck. What should I try next?
 
Got audio from the cabinet but it wont let me upload the zip. Ill have to figure out another way. I adjusted the pot on the pcb with no change to the wahwahwah. I am going to try to recap the monitor tomorrow. Is there anything else that I am over looking?
 
Got audio from the cabinet but it wont let me upload the zip. Ill have to figure out another way. I adjusted the pot on the pcb with no change to the wahwahwah. I am going to try to recap the monitor tomorrow. Is there anything else that I am over looking?

try using an external amp of some kind to check if the amp is good or bad.
 
No lol fixed it from private to public. Still have the issue. Tried adjusting the pot on the pcb but it did not make any difference.
 
Isn't this just the notorious "Nintendo hum"? I know if I stick my ear up to my DK cocktail speaker, I can hear a faint sound that could be described as "wahwahwah"
 
boioioioioioioioioioing

Is it the Mario jump sound in an endless loop?

If so - common - and it will get progressively worse/louder over time. I have fixed it by completely rebuilding the audio PCB (on 4-boards, 2-boards would be just all the crap in the audio section on the CPU PCB). Logically, I believe it is the oscillator (6mhz crystal) that is the root. But since I replace all caps, transistors, and the oscillator all at once, and every time, I can't say for certain.
 
That's what I was afraid of a PCB issue. I have the 2 board dk. I wouldn't even know where to begin replacing all that.
 
I just bought a 2 boardset on eBay and I am having this same issue. I booted the game up and it doesn't play the entire power up sound, then all I hear is this "wah-a-wahwah-a-wahwah-a-wah"(yes I think it's the jump sound loop) faintly in the background. The rest of the sounds are fine, but this one always plays. I haven't messed with it yet, but I know it's not the monitor as I recapped and put new transistors on the chassis and sound board, and my Mario was fine on this monitor.

Any documentation on replacing audio parts on the two boardset?
 
Do a search here. I don't think the info is on the Braisington site but I've seen this topic come up before and I think there's a solution out there.
 
Along with the transistors on the main board there are a bunch of small caps in that area. Test all of those or just recap it. I have seen this problem on alot of boards and usually the caps or transistors are the culprit. I do have one board in my "fix one day" pile that has the jumping sound constant like you described and I have yet to find the cause. Nintendo boards and sound problems seem to go hand and hand.
 
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