Gottlieb System 3: loud screeching from the speakers: replace the sound board capacitors
A System 3 game that makes a screeching noise from the speakers usually has failing electrolytic capacitors on the audio (sound) board. Replacing those capacitors cures it.
Systems
Related tips
- Gottlieb System 3: constant hum from the speaker at idle
- Sound barely audible though music plays: rebuild the aux power supply connector
- Where the boards sit in a System 3 dot matrix backbox
- The A6 sound board
- No sound after the 12 V plug went on the speaker lead
- The A20 auxiliary sound board
- Two-tone screech at switch-on is normal
- Sound needs the A1P4 cable
Source: Pinball Repair help group!! (Facebook group)