1 WARNING...4 2 SAFETY PRECAUTION...4 2.1. Safety Precaution...4 2.2. Insulation Resistance Test...4 3 OWNERS MANUAL...5 4 Keyboard RANGES...15 5 PARTS LOCATION...16 6 DISASSEMBLY INSTRUCTIONS...17 6.1. Opening the top cabinet...17 6.2. Removing the HB, MB, CPL, ROT, CPC, CPR, CNB, ACP, FAJ, JACK, ASUB printed circuit boards...17 6.3. Removing the MAIN printed circuit board...18 6.4. Removing the DISPLAY...18 6.5. Removing the DISPLAY panel...19 6.6. Removing the LCDL, LCDC and LCDR printed circuit boards...19 6.7. Removing the LCD and the INV P.C.B...20 6.8. Removing the Keyboard unit...20 6.9. Removing the Disk Drive Unit...21 6.10. Removing the keys...21 7 SERVICE DIAGNOSTIC FUNCTION...21 7.1. ROM device test...22 7.2. RAM device test...22 7.3. Other device test...22 Page 7.4. Floppy Disk SAVE/LOAD test...22 7.5. Panel SW & LED test...22 7.6. LCD module test (LCD adjustment and confirmation)...23 7.7. In & Out interface test...23 7.8. MIDI IN/OUT test...23 7.9. WAVE ROM test...23 7.10. SOUND SYSTEM test...23 8 PRECAUTIONS BEFORE SERVICING THE MAIN CIRCUIT 24 8.1. About the FLASH ROM...24 8.2. Notes on replacing FLASH ROMs...24 8.3. About the replacement parts...24 8.4. How to write program/data into FLASH ROMs...24 9 MEASUREMENTS AND ADJUSTMENTS 25 10 PRECAUTIONS BEFORE SERVICING...26 10.1. Precautions for measuring of the output waveforms...26 10.2. Important safety notice...26 10.3. Symbolic Marks...26 11 Schematic Diagram...27 12 Printed Circuit Board...52 13 Block Diagram...68 14 Wiring Connection Diagram...72 15 Replacement Parts List...74 16 Cabinet Parts Location...85 17 Packaging...89