Casio GZ-500 - page 21

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KEYBOARD PCBs M616T-KY1M/KY2M

Contents

Main ELECTRICAL CONTENTS SPECIFICATIONS GENERAL OPERATION SETTING UP THE KEYBOARD TRANSMITTING MIDI MESSAGES Page RECEIVING MIDI MESSAGES Page BLOCK DIAGRAM Note: Each key has two contacts, the first conatct (1) and second contact (2). CIRCUIT DESCRIPTION NOMENCLATURE OF KEYS KEY MATRIX 10 BUTTON MATRIX On/Off Octave Shift Modulation POWER SUPPLY CIRCUIT RESET CIRCUIT CPU (LSI106: HD6433298A42F) DIGITAL SIGNAL PROCESSOR (LSI102: HG51B155FD) Page Page ~ DAC (LSI104: UPD6376GS) KEY CONTROLLER (LSI107: HG52E35P) The following table shows the pin functions of LSI107. FILTER BLOCK POWER AMPLIFIER (IC402: LA4598) LED DRIVING MAJOR WAVEFORMS Page MAIN PCB JCM715-MA1M Page Page EXPLODED VIEW