Casio CTK-480- Manuals

Page 2 - GENERAL

— 2 — CONTENTS Specifications .......................................................................................................................... 2 Block Diagram ......................................................................................................................... 3 Circuit...

Page 3 - Power Supply Circuit; BLOCK DIAGRAM

— 3 — CPU MSM 6755B-06 LSI101 Keyboard Buttons LED Reset IC IC102 Oscillator X101, Q111 Q105 Power Supply Circuit Q101 ~ Q104, D108, D109 Power Amp. LA4598 IC101 Filter (L) Q109 Filter (R) Q110 Output DC+9V IN VC VCC AVDD DVDD LVDD APO CC1 ~ CC3 La ~ Lg,Lp KO8 ~KO11 KI0 ~ KI7 KO0 ~ KO7 BLOCK DIAGRAM

Page 4 - CIRCUIT DESCRIPTION; KEY MATRIX

— 4 — CIRCUIT DESCRIPTION KEY MATRIX KI0 KI1 KI2 KI3 KI4 KI5 KI6 KI7 KO0 C1 G#1 E2 C3 G#3 E4 C5 G#5 KO1 C#1 A1 F2 C#3 A3 F4 C#5 A5 KO2 D1 A#1 F#2 D3 A#3 F#4 D5 A#5 KO3 D#1 B1 G2 D#3 B3 G4 D#5 B5 KO4 E1 C2 G#2 E3 C4 G#4 E5 C6 KO5 F1 C#2 A2 F3 C#4 A4 F5 KO6 F#1 D2 A#2 F#3 D4 A#4 F#5 KO7 G1 D#2 B2 G3 D...

Page 5 - FILTER BLOCK

— 5 — + + AVDD AG AG AG AG AG 16 V 10 µ 2SC1740SQ 10 K 10 10 K 10 K C332(H) 33 K C152 (H) C221B (A) 10 V 22 µ 2.2 K To main volume From the CPU CPU (LSI101: MSM6755B-06) The CPU contains a sound data ROM and a DAC (Digital to Analog Convertor), and it provides left and rightchannel sound waveforms i...

Page 6 - LED DRIVING

— 6 — POWER AMPLIFIER (IC101: LA4598) The power amplifier is a two-channel amplifier with standby switch.The following table shows the pin function of IC101. Pin No. Terminal In/Out Function 1 Power GND In Ground (0V) source 2 Ch1 B.S. — Terminal for a bootstrap capacitor 3 Ch1 OUT Out Channel 1 out...

Page 7 - INITIAL RESET CIRCUIT; TROUBLESHOOTING

— 7 — 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-06 LSI101 RESET Reset IC RE5VA35A IC102 VDD Battery Set TROUBLESHOOTING Nature of Trouble Faulty Block Cause/Rem...

Page 8 - MAJOR WAVEFORMS

— 8 — 0 . 1 s C H 1 C H 1 5 V B W L 2 0 µ s C H 1 B W L C H 1 1 V 1 0 µ s C H 1 C H 2 C H 2 B W L C H 1 5 V 5 V 1 m s C H 2 C H 1 B W L C H 1 1 V 1 V C H 2 1 m s C H 1 C H 2 B W L C H 1 1 V C H 2 1 V 1 m s C H 1 C H 2 B W L C H 1 1 V 1 V C H 2 1 R E S E T s i g n a l I C 1 0 2 p i n 1 2 M a i n c l ...

Page 9 - SCHEMATIC DIAGRAMS

— 9 — SCHEMATIC DIAGRAMS Main PCB KDM440-MA1M 10 9 6 8 7 5 3 4 2 1 Notes: 1. All capacitance values are indicated in " µ F" (p=10 -6 µ F) 2. All resistance values are indicated in " Ω " (k=10 3 Ω , M=10 6 Ω ).

Page 11 - PRINTED CIRCUIT BOARDS

— 11 — 9 6 5 7 10 8 1 2 3 4 PRINTED CIRCUIT BOARDS Main PCB KDM440-MA1M Top View Console PCB KDM6111K-KY1M Top View Console PCB KDM6111K-KY2M Top View

Page 13 - EXPLODED VIEW

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

Page 14 - 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...