Time to give up?

stangbat

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I hate to give up. I really do. But I think I'm ready. I've been fighting sound board problems with my WWF RR for two months. I've basically replaced every IC, cap, and active component on the board and it has made no difference.

If this was a machine I really wanted to keep, I'd probably send the board out for repair or look for another. But I got it as a package deal and wanted to fix as a learning experience and out of curiosity. And I really did want to play it.

I can say that I have learned a lot and I've become very adept with my Hakko and soldering station. So I guess all is not lost.

Anyone have any experiences to share where they finally threw in the towel?
 
Hang in there! I broke my cherry on System 80 Gottlieb stuff! Well, I think we all know about Gottlieb stuff....

My best advice to you is just post tech questions on RGP. I know there is some Data East gurus out there! Wish I could help, but I'm not familiar with Data East stuff - still haven't found my D.E. Batman yet!:cool:
 
have you installed this problematic board in another machine? or is that not an option? what happends if you took a jumper wire from the ground TP to the ground on the machine?
 
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Hang in there! I broke my cherry on System 80 Gottlieb stuff! Well, I think we all know about Gottlieb stuff....

My best advice to you is just post tech questions on RGP. I know there is some Data East gurus out there! Wish I could help, but I'm not familiar with Data East stuff - still haven't found my D.E. Batman yet!:cool:

Done that, got some help, but the help dried up.

have you installed this problematic board in another machine? or is that not an option? what happends if you took a jumper wire from the ground TP to the ground on the machine?

I don't have another machine to test the board in, but I've put a good working board in this machine and it was fine. I also swapped out the BSMT2000 chip and CPU with a good working machine and the problems stayed exactly the same.
 
well it appears you have for sure narrowed it down to being in the board.

i guess something you could do that will be a PITA but print two copies of the sound board diagrams, and then measure resistance values of everything one by one marking them on the print outs, then comparing the results. have you tried to add an external ground yet?
 
stay with it. even if it takes a year. when you get it complete you will get to play it and have the satisfaction of knowing you brought it back from the dead. when i went to look at mine i wasn't that crazy about the theme. now that i own it i cant get enough of it. i just love playing it.if you need any pics of anything let me know.
 
well it appears you have for sure narrowed it down to being in the board.

i guess something you could do that will be a PITA but print two copies of the sound board diagrams, and then measure resistance values of everything one by one marking them on the print outs, then comparing the results. have you tried to add an external ground yet?

The other board I have that I've used for comparison is an earlier version (520-5050-00 Rev C), but the main difference between it and the WWF's board is the preamp section. The "data" portion before the preamps as well as the power amps are the same. I've measured voltages and checked resistances between the two and found nothing significantly different.

The only out of whack thing I've found is the +5v and -5v are a little on the high side. +5.68 and -5.68 respectively. I've changed the voltage regulators and it hasn't helped or made any difference at all, in either the voltages or the behavior.

As for grounds, no I haven't installed an external ground. However the other board was grounded the same as this one with no issues. I've also not found any ground problems as I've been checking things.
 
stay with it. even if it takes a year. when you get it complete you will get to play it and have the satisfaction of knowing you brought it back from the dead. when i went to look at mine i wasn't that crazy about the theme. now that i own it i cant get enough of it. i just love playing it.if you need any pics of anything let me know.

A pic of the sound board would help. :D I'd need to be able to read the lettering on the chips. I'd like to make sure that I have the same versions as what is on the original board.
 
so on the good board thats a different version the voltages are different than the one with the static?

On the good board, they are pretty much dead on at +5v and -5v.

I don't understand the high voltages on the board with static considering that I've changed the caps and the regulators. And it is using the same power supply with the same voltages as the good board.

I've checked the voltages going into the preamps and they are the same as the voltage at the regulator's outputs. And the preamps are speced to be run at a higher voltage than what they are getting (one is good to 16v and the other to 36v). You may have noticed this, but the preamps get power from both the positive and negative regulators, so they are designed to run on 10v in this situation.

I've wondered if the preamps inputs are being overdriven and if the reference voltage is wrong. But from what I've been able to test, I don't see it.
 
The board derives the + and - 5v from regulators on the board itself (from the unregulated + and - 12v on the power supply). It also gets regulated +5v from the power supply that is cleaned up a little with some caps and ferrite beads. If you look at the schematics you'll see +5A and -5A, which are derived from the sound board's regulators, and +5v, which is from the PS. It also uses +12v from the power supply to drive the power amps.
 
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