(Topic ID: 275985)

Bally Baby Pacman incorrect sound issue. Please help me find the Waka waka (Reso

By JT-Pinball

1 year ago


Topic Heartbeat

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  • 23 posts
  • 3 Pinsiders participating
  • Latest reply 11 months ago by JT-Pinball
  • Topic is favorited by 1 Pinsider

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#1 1 year ago

I'm working to finish up a baby pacman. I have the game almost 100 percent but still have a persistent issue with the sound. It seems to only play part of the sounds. Plus it seems to jump out of program. Like the game is over and keeps going but sound thinks it's still in the old game. Ideas?

#2 1 year ago

Ok so when I push the cab switch for the sound test I get nothing. When I push the sound test on the Vidiot it makes a single tone and the light flashes 3 times. I have recapped the board. I didn't think this would make a difference but I'm sure it didn't hurt as some caps were bulged. The volume pot is kinda scratchy but that does not explain the partial sound and it not starting or starting correctly. Issue with MPU dip switches? This is a new NVRAM mpu set up for baby pack. But maybe in dip settings?

#3 1 year ago

Don’t think it’s the dip switches. Do you get the start up tune when you power up the game?

#4 1 year ago

You might want to try changing the PIA at U7. I think the signal for the sound test from the coin door goes to the PIA, while the test button on the board doesn’t. Sometimes a port can be bad and it will still pass the self test at startup.

#5 1 year ago

Thank you. I'll swap it for a new one. Yes I get the start up tune. But i only get like half the game sounds. Then it seems to jump out of the sound program. Ie game is over but it just keeps playing the background music

#6 1 year ago

The mpu signals are not all getting to the 6803 sound cpu. Usually it’s the connectors or the PIA. Slight chance it’s the cpu. When you press the test button on the Vidiot, do you get the sound(like a ray gun). ? Then two flashes, not three.

#7 1 year ago

I changed the U7 no change. I have repined all the mpu and most of the vidiot connectors.
There is no sound on any playfield switch hit. Game make the sound when I get ate. But other than that it plays intro tune over and over. Yes when I press vidiot sound test I get the ray gun sound and two flashes.

#8 1 year ago

Game passes communication test

#9 1 year ago

Maybe one of the communication chips. I’ll look at the schematic tomorrow and get back.

#10 1 year ago

I think the switch data inputs to the 6803 on pins 9-12. Step 1: Best to use a logic probe to see if there is activity on these pins as switches are closed.

#11 1 year ago
Quoted from jj44114:

I think the switch data inputs to the 6803 on pins 9-12. Step 1: Best to use a logic probe to see if there is activity on these pins as switches are closed.

Thanks jj44114! I'll grab the probably and see what I got going on there. But I think everything seems to score ok. I have not repined the connectors from the playfield to the sdb.

#12 1 year ago

Ok. So i checked the pins 9-12 on the 6803 at Vidiot U27. On pin 9 i have 5v but no signal on the logic probe. On pin 10 i seem to have nothing. No voltage or signal. Pin 11 and 12 show low.

#13 1 year ago

Have you verified the data on the ROMs/EPROMs and/or recently replaced them? On rare occasions, a bad ROM can potentially pass a ROM check and cause wacky behavior. I'd look at those before you start chasing things on the board and desolder components.

#14 1 year ago
Quoted from ForceFlow:

Have you verified the data on the ROMs/EPROMs and/or recently replaced them? On rare occasions, a bad ROM can potentially pass a ROM check and cause wacky behavior. I'd look at those before you start chasing things on the board and desolder components.

I have not verified them or replaced them. Litteraly everything works but the sound. When in game play the switch hit make sounds but the game just plays the intro tune over and over. No waca waca waca when the gane goes back to the vidieo. When in the pinball mode it makes the tick tock but does not stop when game is over just keeps playing in attract. Push the game button and back to intro tune

#15 1 year ago

I didn't realize the switch hits made sounds. Thought you said there was no sound on switch hits. Did you say the sound test doesn't work from the coin door switch? If it doesn't the mpu isn't communicating to with the 6803.

#16 1 year ago

Yes i did originally. I think i couldnt hear them where i had the game. Game moved to my new shop and now i can hear. Ok so yes all game sounds work except the 500 switch fruits and the spinners. They make the game start the intro tune again. No i dont have coin door sound test. It goes to sound test but no sound. Just when pressed on vidiot.

#17 1 year ago

There is a switch matrix on the Vidiot for those sounds. Seems like that is working. I think the sound test and other communication from the mpu come directly through one of the communication chips, maybe U6. I gotta look at the schematic.

#18 1 year ago

I just checked all the wires on the connectors to make sure they are all in the correct position. They are.

#19 1 year ago

I down the volume and played several games last night. Today i have no sound at all. None on sound test when i press the button. Light still blinks twice tho. Yes i turned the volume back up.

#20 1 year ago

No sound looks like is just the pot. Have to see if i have or need to order. I dont have the 6803 or the 74ls348n in my parts supply. I will add them to my gpe order just incase.

2 weeks later
#21 1 year ago

New u6 came today soni changed it out to rule that out. It did not change anything. Changed the pot for Rt5 volume issue is fixed. I guess i change the 6803 when the new ones arrive??

1 month later
#22 1 year ago

Well i finally got thte new 6803p. I canged out the sound processor and no change. I also have limited the problem to the Vidiot by swapping mine with a good vidiot and problem followed the vidiot. So... ForceFlow suguested new sound roms? I also need to get a sound rom for my Tri Zone. So i guess i can see if someone can burn both for me. Is there anything else i am missing it could be here. Seems it must be limited to sound side of vidiot

1 week later
#23 11 months ago

A good visual inspection with good light and a new more powerful mag glass. Looks like someone in the past dropped something on this board and damaged those two traces.

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