DK has no sound

Joshuart311

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So I finally rebuilt my sanyo in my DK. Everything has been done. Flyback hot cap kit and audio rebuild. Fired it up and have a great screen but zero sound. I tried the DK board in my DK jr. and sound works great. So I know it's not the pcb. What should I check first?
 
Ok so I have the sounds of DK jumping and I have the sounds of Mario running and jumping but no music. If I move the pcb into my DK jr. Cab I have full sounds and music. What gives?
 
Are you using an edge harness?

Id check the brown sound cable, make sure the solder from the amp to sound board isnt broken, then last but not least, check the volume knob on the monitor.
 
Are you using an edge harness?

Id check the brown sound cable, make sure the solder from the amp to sound board isnt broken, then last but not least, check the volume knob on the monitor.

Brown sound cable is good. I even pulled the one from my DK jr. and tried it. I resoldered everything when I rebuilt the soundboard. Volume knob is working correctly
Also it has original harness
 
Try to put your DK board in your DKJr and see if the problem follows. This way you can tell if it is a board issue or something else. Also try adjusting the pot on your DK board at position VR2. This pot mixes the digital and analog sounds. If this doesn't work, try pulling and re-seating the 3F and 3H roms.
 
Try to put your DK board in your DKJr and see if the problem follows. This way you can tell if it is a board issue or something else. Also try adjusting the pot on your DK board at position VR2. This pot mixes the digital and analog sounds. If this doesn't work, try pulling and re-seating the 3F and 3H roms.

Ok moved DK board to DK jr cab and the sound works 100%. Moved it back to the DK cab and the only sounds I get are when DK jumps or Mario runs and jumps. Vr2 does nothing when I turn it though I did not try that while in DK jr. I reseated those roms just for fun and no change. I just did a rebuild on the sound portion of the chassis. I removed the known working one from my DK jr and tried it in the DK. No change. Thanks for the replies thus far. Any other ideas?
 
The only other thing I can think of is power supply. try swapping power supplies and see what happens. - Barry
 
Ok moved DK board to DK jr cab and the sound works 100%. Moved it back to the DK cab and the only sounds I get are when DK jumps or Mario runs and jumps. Vr2 does nothing when I turn it though I did not try that while in DK jr. I reseated those roms just for fun and no change. I just did a rebuild on the sound portion of the chassis. I removed the known working one from my DK jr and tried it in the DK. No change. Thanks for the replies thus far. Any other ideas?

Try this (From Klov member Braze)

http://www.brasington.org/arcade/tech/dkj/#sound
 
Hmmm.
I don't think it's a game board problem because it works fine in the other cab.

I don't think it's a wiring problem because the sound travels via only one wire, wouldn't effect only half the sounds, you get either all or none.

I don't think it's the sound board because you are getting some sound, again either all or none.

The only thing left I can think of is voltage problems. I'm pretty sure the board won't boot without -5 volt, so that must be OK (unless it's high enough to boot, but low enough to not run some of the sound ICs??). +5 obviously OK aswell as just about every chip needs that, so maybe the 12 volt is missing? Without an audio amp onboard I'm not sure what would happen with no 12 volt, maybe a DAC or OP-AMP uses it, leaving the IC essentially turned off??

So in short, grab a multimeter and test all the voltages.
 
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The only thing left I can think of is voltage problems. I'm pretty sure the board won't boot without -5 volt, so that must be OK (unless it's high enough to boot, but low enough to not run some of the sound ICs??). +5 obviously OK aswell as just about every chip needs that, so maybe the 12 volt is missing? Without an audio amp onboard I'm not sure what would happen with no 12 volt, maybe a DAC or OP-AMP uses it, leaving the IC essentially turned off??

So in short, grab a multimeter and test all the voltages.

Definitely on to something there, DK PCB's have both an OP-AMP and a DAC in the audio section.

*edit* Oh, and the OP-AMP(LM324) is directly responsible for managing all of the sounds OP is missing (I just replaced one on a 4-board soundboard exhibiting the exact same 3 analog sounds, missing all digital).
 
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