Casio ctk 485 service manual

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Ñ 1 Ñ SPECIFICATIONS GENERAL Model: CTK-485 Keyboard: 61 standard-size keys, 5 octaves Tones: 100 Polyphony: 12 notes maximum (6 for certain tones) Auto accompaniment Rhythm Patterns: 100 Tempo: Variable (236 steps, = 20 to 255) Chords: 2 fingering methods (CASIO CHORD, FINGERED) Rhythm controller: START/STOP, SYNCHRO/FILL-IN Song Bank Tunes: 100 Controllers: PLAY/PAUSE, STOP, LEFT (ON/OFF), RIGHT (ON/OFF) Multi function display Name display: TONE, RHYTHM, SONG BANK name/number, keyboard settings name/ value Tempo: Tempo value, metronome, synchro standby, beat indicator Other functions Transpose: 12 steps (Ð6 semitones to +5 semitones) Tuning: Variable (A4 = approximately 440 Hz ± 50 cents) Volume: 0 to 9 (10 steps) Terminals Phones/output terminal: Stereo standard jack Output Impedance: 70 W Output Voltage: 2.4 V (RMS) MAX Power supply terminal: 9 V DC Power supply: Dual power supply system Batteries: 6 AA-size batteries Battery life: Approximately 2 hours (SUM-3/R6P)/4 hours (AM3/LR6) AC adaptor: AD-5 Auto power off: Turns power off approximately 6 minutes after last key operation. Enabled under battery power only, can be disabled manually. Speaker output: 2.0 W + 2.0 W Power consumption: 9 V . . . 7.0 W Dimensions (HWD): 91.0 ´ 32.2 ´ 9.0 cm (35 7/8 ´ 12 11/16 ´ 3 9/16 inches) Weight: Approximately 4.0 kg (8.8 lbs) (without batteries) CONTENTS Page Specifications ............................................................................................................................................ 1 Block Diagram ........................................................................................................................................... 3 Circuit Description ..................................................................................................................................... 4 Troubleshooting ........................................................................................................................................ 8 Adjustment ................................................................................................................................................ 9 Major Waveforms .................................................................................................................................... 10 Printed Circuit Boards ............................................................................................................................. 11 Schematic Diagrams ............................................................................................................................... 13 Exploded View ........................................................................................................................................ 16 Parts List ................................................................................................................................................. 17