(Topic ID: 245928)

Haunted House- Sound Locks Up or Cuts Out

By pindude80

4 years ago


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  • 41 posts
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  • Latest reply 4 years ago by pindude80
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#18 4 years ago
Quoted from pindude80:

Unfortunately GPE doesn't carry volume pots

When you adjust the volume pot, if the sound doesn't cut in and out like it has a bad internal connection then it might be safe to say it's ok. If it does, you can open the volume pot up (there are 4 tabs that hold it closed and you can bend them to pull it apart) then bend the internal wiper blades a little so they make better contact and/or give them a clean if there's dirt in there.

#34 4 years ago
Quoted from pindude80:

I'm still thinking about replacing the caps on the sound power supply board but don't know on the 35v vs 50v cap.

That capacitor needs to be 50 volts.

Drop Ed at GPE a line and see if he's got any not listed on his site.

Otherwise you can get them from Mouser, Digikey etc.
I'm not sure of the dimensions of your original cap, but the specs on this one look good - maximum operating conditions are up to 10,000 hours life, 105 degree temp and high ripple currents (3.15A):
https://www.mouser.com/ProductDetail/United-Chemi-Con/EKYA500ELL222MLP1S?qs=sGAEpiMZZMtZ1n0r9vR22YT02h%2F38Wmxc0G8NZqJA6U%3D

#38 4 years ago
Quoted from pindude80:

Do you know what the symptoms would be if the cap was bad?

Looking at the schematics, I imagine you will notice hum from the speaker since it filters the 30V power rail going to the amplifier chip. If you're measuring 30 volts DC at pin 2 of the sound power supply board connector it's probably ok for now. If you're measuring lower than 30 volts, the closer to 24 volts the worse it is.

If the background sound cutout during game then sound restarted ok on a new game, that to me says it's likely a logic signal problem either onboard or through connectors (i.e. not amplifier or power issue).
Clean the edge connectors on those boards with a pink eraser and then wipe any eraser residue off with some isopropyl (alcohol).
Looking at the schematics, the connectors all relating to sound are P1 at the sound power supply board, P1 at the sound/speech board, J4 at the MPU board and J1, J2 and J5 at the driver board.

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