Casio MA-100 Service Manual
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Pin No. Terminal In/Out Function1, 2 TEST1, TEST2 — Not used. Connected to ground.3 RESET In Power ON reset terminal. On: +5 V Off: 0 V4 AVDD In +5 V source for the built-in DAC5 OUT Out Sound waveform output6 AGND In Ground (0 V) source for the built-in DAC7 GND In Ground (0 V) source8 COSI In 21.725 MHz clock pulse input9 COSO — Not used10 VDD In +5 V source11 ~ 18 KI0 ~ KI7 In Input terminals from keys and switches19, 20 KO11, KO10 — Not used21 ~ 30 KO9 ~ KO0 Out Key and switch scan signal outputsCPU (LSI101: MSM6387-13)Containing a sound data ROM and a DAC (Digital to Analog Convertor), the CPU provides sound waveformin accodance with the pressed key and the selected tone.The following table shows the pin functions of LSI101.Filter BlockSince the sound signal from the CPU is a stepped waveform, the filter block is added to smooth the waveform.AVDDC108Q1012SC1740SQC107AGR107R2106C106C109AGR105AGR104R108To power ampFrom CPUAmplifier/Voltage Regulator(IC101: AN8053N)The right figure shows the internal block of IC101.16 15 14 13 12 11 10 987654321SP AMP VREF5V REGPOWERSPO NC SP GND PC-1 PC-2 SPI SPM VREFVCC NC CONT5VVREG NCNC NC PRE GND+-— 4 — |
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