GT-3 Feb. 1999 A B C D E F G H I J K L M N O P Q R S T U V BLOCK DIAGRAM/ ブロック図 MIDI OUT IN EXP BOARD ASSY PEDAL VR CN5 CN4 SUB EXP PEDAL SUB CTL 1,2 JK3 JK2 CN3 CN4 SW 1 BOARD ASSY PANEL SW,LED ENCODER INPUT JK9 IC15b IC18b JK6 IC15a IC1 CPU H8/3006 CN2 CN1 PHONES IC14 CODEC AK4522 SW 2 BOARD ASSY PEDAL SW,LED JK7 IC20b IC19b VR1a OUTPUT L CN1 LCD UNIT OUTPUT R JK8 IC19a IC20a OUTPUT VOLUME VR1b IC7 SRAM 1M JK4 IC21b Q11 IC13a IC2 or IC3 ROM 4M EXT OD/DS RETURN IC12 CODEC AK4522 IC9 DRAM 4M Analog Distortion IC13b JK5 EXT OD/DS SEND MAIN BOARD ASSY IC21a 15