The SPKR line is driven by TIOCB1/TCLCKC, pin 4 of the HD6472246 (the H8S main processor). UB is the unregulated battery supply so there should be a 2.4 volt swing before the 18 Ohm R23.
file: /Techref/cybiko/speaker.htm, 0KB, , updated: 2008/6/16 16:33, local time: 2024/12/17 20:16,
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