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Jokerz: CPU jumpers needed for its stereo sound board

Jokerz uses the stereo sound board D-12338, which has different power needs and cabling. Its CPU board needs these jumpers fitted: W1, W2, W4 and W5; W7 and W8; W11 and W14; W16, W17 and W19. A D-11581 board cannot be substituted in this game.

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Source: Repairing Williams System 11 Pinball 1986 to 1990, Part Two, Clay Harrell (pinrepair.com)