(Topic ID: 252149)

Firepower intermittent sound issue


By RGarriott

9 months ago



Topic Stats

  • 5 posts
  • 4 Pinsiders participating
  • Latest reply 6 months ago by RGarriott
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#1 9 months ago

Im having an issue with my Firepower. It started out with just the sound going crazy and then it would stop, I would turn the table off and back on and the sound would be back to normal.
Now the sound is going out completely. Sometimes it works on startup sometimes it doesn’t. I have checked acouple things. I have tried the sound test switch, sometimes it works, sometimes i get some garbled noise or a 2 tone noise and some not at all.
I have reset all connections and i have also done a grounding test to the sound pins. Sometimes they work sometimes they dont.

Where should i go from here?
Thanks for the help.

#2 9 months ago

Replace the capacitors.
Reflow the print header pins.

#3 9 months ago
Quoted from RGarriott:

Im having an issue with my Firepower. It started out with just the sound going crazy and then it would stop, I would turn the table off and back on and the sound would be back to normal.
Now the sound is going out completely. Sometimes it works on startup sometimes it doesn’t. I have checked acouple things. I have tried the sound test switch, sometimes it works, sometimes i get some garbled noise or a 2 tone noise and some not at all.
I have reset all connections and i have also done a grounding test to the sound pins. Sometimes they work sometimes they dont.
Where should i go from here?
Thanks for the help.

Suspect dirty sockets/ribbon cable sound board crashing:

re seat the sockete'd Ic's and ribbon cable.

#4 9 months ago
Quoted from Inkochnito:

Replace the capacitors.
Reflow the print header pins.

What he said ^^^ and new sockets for the CPU and ROM chips. Many sound boards were built using the same single wipe sockets as the CPU board that are just plain worn out at this age.

2 months later
#5 6 months ago

Problems solved, This was a write up from Dan from Main Street Amusements in Lafayette Indiana.

Another Williams sound board back in action - hopefully! This one was a lot more work than the previous one. It's problem was intermittent, and intermittent problems are always tougher to track down. After verifying that the socketed chips were good the next step was to replace the AMI brand PIA chip. With a new PIA and socket installed the board was running its self test perfectly - until it wasn't. It ran for almost an hour and then started making random weird sounds.
After doing a bit of troubleshooting the next logical suspect was the RAM chip. And look, it's an AMI brand chip! AMI PIAs are garbage, so it's not too big of a jump to assume the same about their RAM chips. Replacing the 6810 RAM chip seems to have fixed the board, but because of the intermittent nature of the problem I'll start the self test and leave it running, for a l-o-n-g time.
Usually I just cut these old chips out, but to hopefully verify that it was indeed bad I removed the 6810 chip intact. After installing a new chip socket I re-installed the original 6810, and the intermittent problem was still present. Replacing the 6810 with a new one seems to have done the trick.

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