Page 2 - GENERAL
F#3 G#3 A#3 C#4 D#4 F#4 G#4 A#4 C#5 D#5 F#5 G#5 A#5 F3 G3 A3 B3 C4 D4 E4 F4 G4 A4 B4 C5 D5 E5 F5 G5 A5 B5 C6 D#3 C#3 A#2 G#2 F#2 D#2 C#2 C2 D2 E2 F2 G2 A2 B2 C3 D3 E3 CONTENTS Specifications .................................................................. 2Block Diagram ..............................
Page 3 - Key Matrix
BLOCK DIAGRAM CPU MSM6387 - 22 LSI101 Amplifier AN8053N IC101 Speaker Oscillator Q102, X101 VDD Keyboard Buttons FilterQ101 KO0 ~ KO8 KI0 ~ KI7 AVDD CIRCUIT DESCRIPTION Key Matrix KO0 ~ KO9 MSM6387-13 KI0 KI1 KI2 KI3 KI4 KI5 KI6 KI7 KO0 0 1 C2 C#2 D2 D#2 E2 F2 KO1 2 3 F#2 G2 G#2 A2 A#2 B2 KO2 4 5 C3...
Page 4 - Filter Block
Pin No. Terminal In/Out Function 1, 2 TEST1, TEST2 — Not used. Connected to ground. 3 RESET In Power ON reset terminal. On: +5 V Off: 0 V 4 AVDD In +5 V source for the built-in DAC 5 OUT Out Sound waveform output 6 AGND In Ground (0 V) source for the built-in DAC 7 GND In Ground (0 V) source 8 COSI ...
Page 5 - TROUBLESHOOTING
TROUBLESHOOTING No power Power indicator does not light up. Connect an AC adapter into the power jack. Does the keyboard work? Measure voltage at pin 16 of IC AN8053N. Is the voltage +6.8 V? Check contact of the power jack. Is it OK? Replace the jack. Check soldering at pins of the power jack. Is it...
Page 8 - MAJOR WAVEFORMS
MAJOR WAVEFORMS 1 Clock pulse COSIMSM6387-13 pin 8 2 3 Key scan signal KO0MSM6387-13 pin 30 Key scan signal KO1MSM6387-13 pin 29 4 5 6 7 Sound signal output MSM6387-13 pin 5 Filter outputEmitter of Q201 Power amp inputLA4598 pin 6 Power amp output LA5498 pin 3 Tone : Flute (No.13)Key : A3Volume : Ma...
Page 9 - SCHEMATIC DIAGRAMS
Page 11 - PCB VIEW; Main PCB
Page 12 - EXPLODED VIEW
— 12 — R-1 R-2 1 10 9 12 2 13 3 4 8 7 11 5 6 EXPLODED VIEW
Page 13 - This parts list does not include the cosmetic parts, which; PARTS LIST
Notes: This parts list does not include the cosmetic parts, which p a r t s a r e m a r k e d w i t h i t e m N o . " R - X " i n t h e e x p l o d e dview.C o n t a c t o u r s p a r e p a r t s d e p a r t m e n t i f y o u n e e d t h e s eparts for refurbish. 1. Prices and specifications...