Author Topic: Pac Man Sound Help...Fixed: New Video!! (Read 3324 times)

whammoed · « **on:** February 21, 2008, 10:57:40 pm »

I have a pac man cocktail where all the sounds are just static. They all "play" in test mode, but they are just some level of static. I hunted for some troubleshooting guides and came upon a PDF and some blogs but I was wondering if someone could point me in the right direction so I don't just go replacing chips willy nilly or something. Or if you happen to have an idea what may be the culprit, please let me know.

pcb · « **Reply #1 on:** February 22, 2008, 01:17:54 am »

Reseat the proms at 3m and 1m, if that doesn't help, it can either be a bad socket in those locations, or a logic chip may have gone bad.

Best,

- Mike -

whammoed · « **Reply #2 on:** February 22, 2008, 11:17:22 am »

Thanks, I'll have time to give this a try tomorrow.

BTW, nice to have you posting here, I've purchased from your website before. Very handy for the midway cocktail bits I've needed.

Ken Layton · « **Reply #3 on:** February 22, 2008, 11:56:30 am »

Mowerman has an excellent troubleshooting site:

http://users.adelphia.net/~68hc11/

So does mikesarcade.com

whammoed · « **Reply #4 on:** February 22, 2008, 12:28:03 pm »

Quote from: Ken Layton on February 22, 2008, 11:56:30 am

Mowerman has an excellent troubleshooting site:

http://users.adelphia.net/~68hc11/

So does mikesarcade.com

Thanks Ken. The closest thing I could find from Mowerman was:
No Sound, Hum during Sound.

Rams @ 2L & 2K bad

and Mike from MikesArcade is posting here as pcb which is great...I was unsure where to start after browsing his repair log.

whammoed · « **Reply #5 on:** February 23, 2008, 10:57:24 am »

Well, now I don't have gameplay when I powered it up, just the white grid. The previous owner mentioned it and it has reared it's ugly head again I guess...

Test mode shows no errors though so I went ahead and reseated proms in 1m and 3m but I still have the sound problem as well.

PS, for anyone else with Pac troubles here is another page to look at:
http://www.arcadegameover.com/pactrouble.html

whammoed · « **Reply #6 on:** February 23, 2008, 12:04:26 pm »

He he...video is running again after cleaning the cabinet and reseating some more chips. Could just be coincidence.

There is some "undulation/waving" on the monitor...I assume this means the monitor PCB needs capped?

STILL HAVE BAD SOUND!!! ACK!!!!

Mauzy · « **Reply #7 on:** February 23, 2008, 06:15:42 pm »

Does your speaker HUM? If it does, that monitor wave is probably a Hum bar. It has something to do with the power in the cab. I have one in my cocktail too. Just can't seem to get rid of it either...

whammoed · « **Reply #8 on:** February 23, 2008, 06:49:49 pm »

Quote from: Mauzy on February 23, 2008, 06:15:42 pm

Does your speaker HUM? If it does, that monitor wave is probably a Hum bar. It has something to do with the power in the cab. I have one in my cocktail too. Just can't seem to get rid of it either...

Nope, no hum. Just some static noises when game music/sounds are supposed to play.

whammoed · « **Reply #9 on:** February 26, 2008, 06:04:45 pm »

Mike,

I have replaced all fuse blocks and fuses since they showed some corrosion, so I am ready to get back to this sound issue. I suppose I am to the point where I need to order some parts and start replacing things that are likely culprits. You mentioned the sockets at 1m and 3m so I will do that. Any other parts I should get while putting in an order? Perhaps the sound amp? I will probably go to your site for parts so If you could tell me if you have the parts needed that would be helpful.

Here is a video with the audio issue:
[youtube]http://www.youtube.com/watch?v=vusFfMZ6Yus[/youtube]

pcb · « **Reply #10 on:** February 26, 2008, 08:38:21 pm »

If it's not the prom connections, the place to start is to replace the two 82S25 (7489) rams at 2K and 2L:

http://www.mikesarcade.com/cgi-bin/store.pl?sku=RAM7489

The amp and triggers are fine.

- Mike -

whammoed · « **Reply #11 on:** February 26, 2008, 08:42:12 pm »

Thanks Mike. Do you think replacing the filter caps will help the waviness I'm seeing on the monitor?
Someone also suggested perhaps the edge connector, but that looks to be in like new condition...

whammoed · « **Reply #12 on:** February 26, 2008, 08:46:36 pm »

Also, should I go ahead and install sockets for the ram?

pcb · « **Reply #13 on:** February 27, 2008, 10:35:42 am »

It can't hurt to install sockets for the rams. Your board is not generating the proper sounds, that is a logic problem. There is a few chips in that area that can result in what your board sounds like. First, 1M, 3M proms, the 7489 rams are always the first place to look.

I see you are dealing with the Hum Bar in a different tread. Humbar like you have is generally fuse-block, edge-connector problems. See the following from Bob Roberts:

http://www.therealbobroberts.net/hum.html

Best,

- Mike-

whammoed · « **Reply #14 on:** February 27, 2008, 10:56:36 am »

Yeah, I thought it was a monitor issue until I found out about the humbar deal. I have already taken care of the fuses so I will turn my attention to the connector on this issue.
My shopping list is:
2 x ram
2 x sockets
1 x connector and pins

whammoed · « **Reply #15 on:** February 27, 2008, 11:26:03 am »

Mike,

I see there is a crimp pin and a solder version option for a new edge connector. Is there any advantage over one or the other?....reliability, ease of install, etc?
I'm proficient in both crimping and soldering so I don't think I would have a personal preference.

pcb · « **Reply #16 on:** February 27, 2008, 01:28:41 pm »

I feel the crimp pins are best.

whammoed · « **Reply #17 on:** February 27, 2008, 06:04:43 pm »

Mike,

I did the Ohm measurement bob does on this page to show he has a bad edge connector:
http://www.therealbobroberts.net/pacpower.html
But I get 0.00 Ohms on my digital multimeter. This doesn't leave me with a warm fuzzy that replacing the edge connector will make any difference in the humbar. Could mine be one of the 2 percent where there is a problem with the caps? Do you think I should replace the connector anyway?

whammoed · « **Reply #18 on:** February 27, 2008, 06:27:24 pm »

Also, the waviness seems like it's still there (kinda hard to tell with no graphics) even when the vidio signal is not plugged into the monitor.

pcb · « **Reply #19 on:** February 27, 2008, 08:32:24 pm »

No harm in trying the cap first. Go for it.

whammoed · « **Reply #20 on:** February 27, 2008, 08:57:05 pm »

Quote from: pcb on February 27, 2008, 08:32:24 pm

No harm in trying the cap first. Go for it.

I think I'll try pulling a monitor from another game to make sure it's not the monitor as well. Capping the monitor couldn't hurt regardless I suppose.

whammoed · « **Reply #21 on:** February 27, 2008, 10:54:50 pm »

Ram and sockets ordered. Hopefully this will fix the sound issue which is the main issue I want to fix. I will update once I have them installed.

whammoed · « **Reply #22 on:** March 01, 2008, 03:01:15 pm »

I replaced the RAM and...Sweeeeeeeeeeeeet! WakaWakaWakaWakaWakaWakaWakaWakaWaka
Thanks Mike! You definitely saved me some time and money pointing me in the right direction.

Here's a clip of the test mode sounds after repair:

[youtube]http://www.youtube.com/watch?v=myu3U5rMtGE[/youtube]

whammoed · « **Reply #23 on:** March 02, 2008, 02:19:37 pm »

I've confirmed the waviness is the monitor so I will continue with that repair in the thread I have in the monitor forum:

http://forum.arcadecontrols.com/index.php?topic=77020.0

pcb · « **Reply #24 on:** March 02, 2008, 03:03:24 pm »

Quote from: whammoed on March 01, 2008, 03:01:15 pm

I replaced the RAM and...Sweeeeeeeeeeeeet!

Good Job!

- Mike -


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