Recapping the speech board: C26 really is fitted the 'wrong' way round
When replacing the capacitors on the speech board, C26 (a polarised capacitor) appears on both the schematic and the board's silkscreen to be installed backwards compared with what you might expect. Fit it the way the board and schematic show, matching a known working board: the original poster did this and the board worked flawlessly.
Systems
Games
Related tips
- System 6/7 sound and speech board ROMs
- System 6/7 speech boards take 2532 EPROMs
- Sound and speech board sockets need checking too
- Which sound board each game uses
- Setting up a sound board for speech
- Sound board jumpers for sound-and-speech games (2K ROM)
- Sounds don't match the game or die mid-game: sagging 7805 on the sound board
- Sound self-test passes but some game sounds never play: bad PIA on the sound board
Source: Pinball Repair help group!! (Facebook group)