Casio CTK-630 - page 20

MA0800951A

Contents

Main ELECTRONIC KEYBOARD (with price) CTK-630 CONTENTS ELECTRICAL SPECIFICATIONS GENERAL BLOCK DIAGRAM CIRCUIT DESCRIPTION KEY MATRIX 5 Key Second contact (2) First contact (1) FI KC SI POWER SUPPLY CIRCUIT NOMENCLATURE OF KEYS RESET CIRCUIT CPU (LSI105: UPD912GF-3BA) DIGITAL SIGNAL PROCESSOR (LSI101: HG51B227FB) From the DAC To main volume DAC (IC102: UPD6379GR) FILTER BLOCK POWER AMPLIFIER (IC101: LA4598) LED DRIVING TROUBLESHOOTING MAJOR WAVEFORMS 1 2 3 5 PRINTED CIRCUIT BOARDS Main PCB JCM461-MA1M 18172019 1416 1015 89 12765 34 112 113 NO. 45678 SCHEMATIC DIAGRAMS