Golden Axe: Revenge of the Death Adder No Sound

[Jareardy]

Hey everybody, first post here on the board, just joined yesterday. I recently bought Golden Axe off of craigslist and it works perfectly, except for one thing, the sound. I've taken a DMM to it and it reads less than 2 volts RMS from the speaker wires. Is this a common problem?

Now when I look at the schematics that the guy gave me when I bought it, it seems there are two different versions. One that has a pair of + and - speaker outputs and one that has only 2 + speaker outputs. I've attached links to the schematics I was talking about so you can take a look at them, am I wrong here? Both of the schematics are for revenge of the death adder

Any help would be great.

http://img340.imageshack.us/img340/7254/diag2s.th.jpg (http://img340.imageshack.us/i/diag2s.jpg/)

http://img3.imageshack.us/img3/6844/diagg.th.jpg (http://img3.imageshack.us/i/diagg.jpg/)

[Arcade Antics]

Both images show + and - for each speaker, you should have two speakers in the cab. Did you adjust the volume pot?

[Jareardy]

In the bottom diagram, it shows only one connection for a speaker. Where do you see the second speaker hook up? But the pot is not connected right now, I was trying to figure out what the discrepancy was first before I started rewiring everything.

[Arcade Antics]

In the bottom diagram, it shows only one connection for a speaker. Where do you see the second speaker hook up? But the pot is not connected right now, I was trying to figure out what the discrepancy was first before I started rewiring everything.

The bottom image is the JAMMA pinout. The top image is the schematic and shows two speakers, both of which have a + and -.

[Jareardy]

But the first diagram is from the jamma output as well isn't it? If it is not I can submit some pictures and maybe you can circle where it is that those areas are. Thanks for the help regardless though.

[bust3dstr8]

The top schematic is outputting dual mono through the filter board, thats the
signal taken off the Jamma edge. This pcb should also have a 4 pin molex connector to do stereo. Also check the 12V, some boards are fussy and
will lose sound if that is low.

[Jareardy]

Okay, I'm going to try to take some pictures of the board and maybe we can find the spot where the molex went. I've tried looking for it and for the life of me can't find it. Thanks for the help, I appreciate it.

[Jareardy]

Here are the attached pictures. The last is the pot for the volume control. Are both of the pots so you have one for each speaker? Also if you could highlight where the speaker output should be would be perfect.

Thanks again












[/URL]

Uploaded with [URL=http://imageshack.us]ImageShack.us (http://img297.imageshack.us/i/brdpot.jpg/)

[Jareardy]

Here are the attached pictures. The last is the pot for the volume control. Are both of the pots so you have one for each speaker? Also if you could highlight where the speaker output should be would be perfect.

Thanks again


[/URL]

(http://img203.imageshack.us/i/brd2c.jpg/)



(http://img33.imageshack.us/i/brd3.jpg/)



[URL=http://img297.imageshack.us/i/brdpot.jpg/] (http://img248.imageshack.us/i/brd5.jpg/)

[Jareardy]

http://img297.imageshack.us/img297/1841/brdpot.jpg

http://img297.imageshack.us/img297/1841/brdpot.th.jpg (http://img297.imageshack.us/i/brdpot.jpg/)

[Jareardy]

http://img297.imageshack.us/img297/1841/brdpot.jpg
http://img203.imageshack.us/img203/8458/brd2c.th.jpg


[/URL]

(http://img203.imageshack.us/i/brd2c.jpg/)



(http://img33.imageshack.us/i/brd3.jpg/)



[URL=http://img297.imageshack.us/i/brdpot.jpg/] (http://img248.imageshack.us/i/brd5.jpg/)

[Jareardy]

Sorry about the triple post, sites not working for me right now. Will try again in morning.

[Jareardy]

Well I can't delete the other posts, but I tested the 12v wires that you were talking about and it was registering as 14v instead. So I don't know if this would cause a problem like that with the audio or not. Also I'm still trying to figure out what the difference is between the two schematics, does anyone have an idea to this?

[Blur2040]

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[Arcade Antics]

Also I'm still trying to figure out what the difference is between the two schematics, does anyone have an idea to this?
What two schematics? If you mean the JAMMA pinout and the schematics, that was answered twice already. If you mean something else, not sure what you mean.

[Jareardy]

What two schematics? If you mean the JAMMA pinout and the schematics, that was answered twice already. If you mean something else, not sure what you mean.

Yeah but they were not answered very clearly. Sure I can clearly see that there are two speaker outputs for the schematic, but they have specific pins assigned to the speaker outputs. Whereas on the actual jamma pinout, it only has pin assignments for one speaker.

[sammybean]

I joined just to respond to you, and in hopes you could help me, as I've Death Adder issues as well! :) The reason that there's no second speaker on the Jamma pinout is because Jamma does not support stereo sound. If you'd like stereo sound you can always rig up another speaker, but it's not there by default :). I've scoured the internet for the schematic you've got and can't find one.. Any chance of taking a picture or series, tracing the Sync pin on the jamma edge? I believe it goes through FLT19 and then to pin 41 of Ic73, but I'm still not finding any issues... :(

[shawnbo42]

Well, according to the KLOV (www.klov.com, for those who may not know), Death Adder is a stereo output (i.e. 2-channel sound) board. I would start with first things first. If your board (I can't recall) is JAMMA, then if you have capabilities to, swap the board out with a different PCB in the cabinet. That will tell you if the problem is in the board, or the cabinet.

If you are not able to do this, check your pinouts for a JAMMA harness. Find the two that are speaker + and - , and wire those to your speaker in the cab. At that point you should have 12 volts (or thereabouts) at the speaker terminals. If you do, and you still have no sound, I would suspect a bad speaker, or the volume is turned all the way down. Most boards have a white or black potentiometer (pot) mounted somewhere (usually) near the corner of the board. That is your sound control. Wire the sound directly from the board's edge connector to the speaker for test purposes first, you can always add another volume afterwards if you like. Chances are the cabinet was converted anyways, and that original volume control was bypassed, as it was too much labor to wire it back in.

If you have voltage at the speaker with it wired directly from the board, and you know for fact your speaker is good (there's another way to test a speaker, google it, I cna't remember right now), then logically speaking, the only possible remaining problem is the board.

KLOV did say that the board was wired for stereo sound, so that could account for your extra wires on the harness? I don't know, I'm not familiar with that particular board, and can't be of more assistance. Try what I've posted first, and if you determine it is in fact the board is the problem, then look into fixing your issue from there. But, always start with the basics, and work your way in, it saves you a lot of headache down the road. Hope this helps.