Mr. Pinball Tip:

A cheap AM radio can be a useful solid-state troubleshooting tool. Tune to a quiet spot on the dial and bring the antenna (that ferrite bar with a coil wrapped on it inside the radio) close to any digital I.C., try rebooting, resetting and closing different switches in the system and note the changing tones. Compare a working and malfunctioning circuit. With practice you can identify a correct sequence of tones for each board.

Steve McInnis

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