donkey kong speaker hum..

learpilot2

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I got a donkey kong that has loud speaker hum. I could hear it across the room. I recapped the monitor and the audio pcb. The hum improved greatly. It is very mild, and the best I think it can get.

The only problem is now I have a new sound from the speaker after recapping. A moderate sounding siren noise, like on a police car, wailing from the speaker along with the mild hiss. This siren sound is new after the recap. I tried adjusting the sound balance and volume with no improvement. Any ideas???? Not sure what sound balance is.
 
I had that 'wawawawawawa' sound on the DK that I was working on too, right after I capped the board. I believe the caps need to burn in for a little while. Let the game run for an overnight, power it down, and back on again. See if the sound gets better. Mine did.
 
I've rebuilt 2 amp boards now and I never had to do any breaking in on em. did you guys use thermal compound on the heatsink where the transistor gets screwed in? I personally use Arctic Silver Ceramique for all my redemption/video game heatsinks.

make sure you didn't mix the JB and JC connectors -- that's bad.
 
Both hum and "wahwahwah" nitrus sounds are pretty common. The hum is caused by the bad design of the audio amp and, from what I understand, the only way to fix it is to use a different amp. The consensus seems to be that you can't "fix it" and that all Nintendo games with this design have the hum.

The wahwahwah is usually caused by the board. See Mike's arade's repair logs. . . . I wonder whether the wahwahwah was always there but you just didn't notice it until you improved the hum.

04/20/2004

Problem: Background tone always present, walk sound off.

Sounds like the walk sound never completely cuts off.

Solution: replace transistor Q6 on the CPU board, a 2SC 1815


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04/20/2004

Problem: Whirring sound all the time.

Sounds like the jump sound never completely cuts off.

Solution: replace transistor Q4 on the CPU board, a 2SC 1815
 
I have this same problem with my Mr Do game. The hum is pretty extreme. I always thought that maybe I had a loose ground or something, but do you think it is the soundamp?
 
Both hum and "wahwahwah" nitrus sounds are pretty common. The hum is caused by the bad design of the audio amp and, from what I understand, the only way to fix it is to use a different amp. The consensus seems to be that you can't "fix it" and that all Nintendo games with this design have the hum.

The wahwahwah is usually caused by the board. See Mike's arade's repair logs. . . . I wonder whether the wahwahwah was always there but you just didn't notice it until you improved the hum.

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04/20/2004

Problem: Whirring sound all the time.

Sounds like the jump sound never completely cuts off.

Solution: replace transistor Q4 on the CPU board, a 2SC 1815


This. My board had this issue, replaced the transistor and it went away. Just listen closely, see if it's the jump sound or the walk sound that keeps repeating endlessly, and replace the appropriate transistor. Might as well replace both while you're at it, they're like 15 cents each from electronix.com
 
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