(Topic ID: 102911)

Black Knight Sound then no sound


By 04barb

4 years ago



Topic Stats

  • 13 posts
  • 4 Pinsiders participating
  • Latest reply 4 years ago by ChrisHibler
  • Topic is favorited by 1 Pinsider

You

Linked Games

#1 4 years ago

I had great sound for games and games, then no sound. I cleaned the PIA chip and rom chip on the board. I reinstalled and I got sound for a minute then absolutely no sound. If I turn off the game then back on I get no sound. Is it the rom or PIA chip/ socket? The PIA is one of the crappy AMI brands.

#2 4 years ago

It could be many things.
Start with the 9 pin connector that carries the should signals to the board. Fractured solder joints are almost always an issue.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The new place for pinball repair info

#3 4 years ago

I replaced all the caps on the sound board and re soldered the header pins. I grounded the inputs coming from the cpu connector to the sound board and got no sounds. So it must be an issue with the sound board.

#4 4 years ago
Quoted from ChrisHibler:

Start with the 9 pin connector that carries the should signals to the board. Fractured solder joints are almost always an issue.
--

Chris, which 9 pin connector? On the left or the right on the sound board? I have a similar issue with my Tri Zone.

#5 4 years ago

The sound board diagnostic switch does nothing also?

#6 4 years ago
Quoted from Toyguy:

The sound board diagnostic switch does nothing also?

04Barb - I don't mean to HiJack your thread but maybe I could add to it as we might have a similar issue.
When I press the test button I usually do get a sound. But again, it usually fades out or sometimes it will just continue forever.

In addition, when I do get intermittent sound during gameplay... It is usually the musical notes. No matter which setting I have selected.. it's always notes. My test button will play an actual sound.

My caps and chips are new. I too have reseated them but continue to have the same problem.

#7 4 years ago

Just repinned the entire sound board. Same issues.

#8 4 years ago

On my game, pressing the switch on the sound board does nothing. Dayday: did you have an AMI 40 pin CPU chip on the sound board? I still think that chip is faulty and I'm going to order one. Even though the socket for the 40 pin cpu chip isn't scanbe I don't trust it because on the CPU board I had to replace a 24 pin socket that was faulty because when I twisted it it locked up the game. That chip socket on the cpu board wasn't scanbe.

#9 4 years ago
Quoted from DayDay:

Chris, which 9 pin connector? On the left or the right on the sound board? I have a similar issue with my Tri Zone.

The one on the left carries the sound selects. Sorry that I'd forgotten about the 9 pin connector on the right, which carries Power.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The new place for pinball repair info

#10 4 years ago
Quoted from 04barb:

On my game, pressing the switch on the sound board does nothing. Dayday: did you have an AMI 40 pin CPU chip on the sound board? I still think that chip is faulty and I'm going to order one. Even though the socket for the 40 pin cpu chip isn't scanbe I don't trust it because on the CPU board I had to replace a 24 pin socket that was faulty because when I twisted it it locked up the game. That chip socket on the cpu board wasn't scanbe.

If you have a logic probe, you can easily see if the processor is executing instructions.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The new place for pinball repair info

#12 4 years ago

On a hunch I replaced the 40 pin 6808 CPU. Sound works and doesn't cut out. The old CPU was a AMI brand and I saw a video of an AMI CPU chip working then not working. Also I had an AMI chip on my bally Sapce invaders MPU board that was bad. They don't hold up well.

#13 4 years ago
Quoted from 04barb:

On a hunch I replaced the 40 pin 6808 CPU. Sound works and doesn't cut out. The old CPU was a AMI brand and I saw a video of an AMI CPU chip working then not working. Also I had an AMI chip on my bally Sapce invaders MPU board that was bad. They don't hold up well.

The failure rate of AMI chips seems much higher to me too.
I always suspect them when I encounter an odd problem.
--
Chris Hibler - CARGPB #31
http://www.Team-EM.com
http://webpages.charter.net/chibler/Pinball/index.htm
http://www.PinWiki.com - The Place to go for Pinball Repair Info

Promoted items from the Pinside Marketplace
2,100
Machine - For Sale
Mt Rainier, MD
$ 75.95
Cabinet - Shooter Rods
Super Skill Shot Shop
Wanted
Machine - Wanted
Lemoore, CA
$ 50.00

Hey there! Got a moment?

Great to see you're enjoying Pinside! Did you know Pinside is able to run thanks to donations from our visitors? Please donate to Pinside, support the site and get anext to your username to show for it! Donate to Pinside