Casio CTK-485- Manuals

Page 2 - SPECIFICATIONS; GENERAL; CONTENTS

— 1 — 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: ...

Page 3 - ELECTRICAL

— 2 — ELECTRICAL Current drain with 9 V DC: No sound output 137 mA ± 20 % Maximum volume 710 mA ± 20 % with white keys C1 to G2 pressed in Synth-Lead 1Volume: maximum. Speaker output level (Vrms with 40 Ω load each channel): with key A1 pressed in Synth-Lead 1 L-ch: 1,260 mV ± 20% R-ch:1,200 mV ± 20...

Page 4 - BLOCK DIAGRAM

— 3 — BLOCK DIAGRAM CPU MSM 6755B-17 LSI1 Keyboard Buttons LCD LCD Driver KS0066U-10B LSI3 Reset IC IC1 Power Switch Oscillator X1, Q1 Power Supply Circuit Q101 ~ Q104, D205 Power Amp. LA4598 IC101 Filter (L) Q106 Filter (R) Q107 Phones/Output Speaker (L) Speaker (R) VC VCC DVDD AVDD APO MD0 ~ MD7 M...

Page 5 - CIRCUIT DESCRIPTION; KEY MATRIX

— 4 — CIRCUIT DESCRIPTION KEY MATRIX NOMENCLATURE OF KEYS 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 C2 D2 E2 F2 G2 A2 B2 C3 D3 E3 B6 A6 G6 F6 E6 D6 C7 C#3 A#2 G#2 F#2 D#2 C#2 A#6 G#6 F#6 D#6 C#6 KI0 KI1 KI2 KI3 KI4 KI5 KI6 KI7 KO...

Page 8 - FILTER BLOCK

— 7 — POWER AMPLIFIER (IC101: LA4598) The power amplifier is a two-channel amplifier with standby switch.The following table shows the pin function of IC101. FILTER BLOCK Since the sound signals from the CPU is stepped waveforms, the filter block is added to smooth the waveforms. Amp. LA4598 Filter ...

Page 9 - INITIAL RESET CIRCUIT; TROUBLESHOOTING

— 8 — INITIAL RESET CIRCUIT When batteries are set or an AC adapter is connected, the reset IC provides a low pulse to the CPU.The CPU then initializes its internal circuit. CPU MSM 6755B-17 LSI1 RESET Reset IC RN5VD40A IC1 VDD Battery Set TROUBLESHOOTING Nature of Trouble No power No sound at all C...

Page 10 - ADJUSTMENT; MAIN PCB

— 9 — 3) Equipment connection/Procedure ADJUSTMENT MAIN PCB 1) Items to be adjusted: 2) Adjustment and Test Point Locations Item Measuring Instrument Vop voltage setting Voltmeter TP2 (Top View) (Bottom View) VR1 Vop voltage setting Watching the LCD at a 41.20 ° angle to the horizontal, adjust Vop v...

Page 11 - MAJOR WAVEFORMS

— 10 — MAJOR WAVEFORMS 0 . 1 s C H 1 C H 1 5 V B W L 1 RESET signalIC 1 pin 1 1 2 0 µ s C H 1 B W L C H 1 1 V 2 2 Main clock pulseMSM6755B-17 pin 32 1 0 µ s C H 1 C H 2 C H 2 B W L C H 1 5 V 5 V 3 Key scan signal KO10MSM6755B-17 pin 72 4 Key scan signal KO11MSM6755B-17 pin 73 3 4 1 m s C H 2 C H 1 B...

Page 12 - PRINTED CIRCUIT BOARDS; Top View

— 11 — PRINTED CIRCUIT BOARDS Main PCB JCM450-MA1M Top View Bottom View 1 2 7 5 3 4

Page 14 - SCHEMATIC DIAGRAMS

— 13 — SCHEMATIC DIAGRAMS Main PCB JCM450-MA1M 1 2 7 5 3 4

Page 17 - EXPLODED VIEW

— 16 — EXPLODED VIEW 13 14 9 8 6 15 18 5 12 4 17 6 1 19 10 11 3 2 7 16 R-1 R-2 R-4 R-5 R-6 R-3 R-6 R-5

Page 18 - 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...

Page 20 - Overseas Service Division

CASIO TECHNO CO.,LTD. Overseas Service Division 8-11-10, Nishi-ShinjukuShinjuku-ku, Tokyo 160-0023, Japan