Aug.2001 DR-670 BLOCK DIAGRAM fig.block 18 19 A ENCODER LCD MODULE FOOT SW IC1 IC2 PHONES IC6 BA15218 NJM4556 IC13 IN PHOTO COUPLER DAC MIDI L(MONO) BU9480 2/6 IC1 R OUT IC3 IC4 GATE ARRAY OUTPUT CPU uPD703106 Q3 VOLUME RED POWER ANALOG DC-DC 1 SWITCH CONVERTER 1 Q4 VCC_3.3 IC11 GREEN Q2 DC IN 9V DATA BUS ADDRESS BUS BATTERY 4/6 IC1 IC12 CR2032 JACK BOARD IC7 SRAM PRESSURE SW MATRIX VCC_3.3 SENSOR Q1 IC5 Vpp FLASH MEM MAIN BOARD A ADDRESS BUS