Some sounds or words are missing or garbled, or there is no sound or speech at all.

Garbled or partial sounds from bad ROMs or sockets

Cause: A bad sound or speech ROM (original black ROMs have silver legs that tarnish and break, and they lose data), or bad Scanbe sockets.

Checks

• Check ROM legs and sockets.

Fix

• Replace all Scanbe sockets on the sound and speech boards, then retest.
• If still bad, burn new EPROMs. Speech boards up to System 7 take up to four 2532s (System 9 speech boards use 2732s); the sound board takes one 2716 or 2532.

Systems

• Williams System 3
• Williams System 4
• Williams System 6 / 6A
• Williams System 7

Related tips

• Speech board faults
• System 7: the 2532 goes in IC17, the 2716 in IC20
• Run Firepower on a System 7 CPU board
• Leon's test EPROM: what to burn and where it goes
• Leon sound board test EPROM
• System 3/4 sound board jumpers for 7641 PROM vs 2716
• System 6/7 sound and speech board ROMs
• Sound board jumpers for sound-and-speech games (2K ROM)

Source: Repairing Williams System 3 to System 7 Pinball 1977 to 1984, Part Three, Clay Harrell (pinrepair.com)