Casio CTK-220L- Manual

Page 2 - CONTENTS

CONTENTS Page Specifications ................................................................................................................................... 1 Block Diagram ..............................................................................................................................

Page 3 - SPECIFICATIONS; GENERAL

— 1 — SPECIFICATIONS GENERAL Number of keys: 49 Polyphonic: 12-note Preset tones: 100 Transpose: F# ~ C ~ F: half-note Auto-rhythms: 25, Tempo: Adjustable, 216 steps (40 ~ 255), initial value: 120 Accompaniment: CASIO Chord, Fingered, Fill-in pattern, Synchro start Song bank: 20-tune Digital volume ...

Page 4 - BLOCK DIAGRAM; Buttons; PG; Power Supply Circuit; Filter; CPU

— 2 — BLOCK DIAGRAM Buttons IlluminantKeyboard 7 seg. LED LED Latch IC2, IC3 Q5 ~ Q8 Q1 ~ Q4 PG X1, Q11 Reset IC IC1 Power Supply Circuit Q301 ~ Q304 D334, D336 Amp. IC301 LA4598 Filter Q305 Phone/Output DC+9 V IN APO MD0 ~ MD7 KO8 ~ KO11 LY1 ~ LY7 KO0 ~ KO7 LX0 ~ LX7 KI0 ~ KI7 CPU LSI1 MSM 6755B-13...

Page 5 - CIRCUIT DESCRIPTION; KEY MATRIX

— 3 — LX0 LX1 LX2 LX3 LX4 LX5 LX6 LX7 LY1 D4 D3 C3 C2 G#2 F#2 D#2 C#2 LY2 C4 E3 B2 D2 A#2 C#3 D#3 F#3 LY3 B3 F3 A2 E2 D#4 C#4 A#3 G#3 LY4 A3 G3 G2 F2 C#5 A#4 G#4 F#4 LY5 E4 C5 D5 B5 D#5 F#5 G#5 A#5 LY6 F4 B4 E5 A5 C6 LY7 G4 A4 F5 G5 CIRCUIT DESCRIPTION KEY MATRIX LED MATRIX KI0 KI1 KI2 KI3 KI4 KI5 K...

Page 7 - FILTER BLOCK; LED DRIVING

— 5 — LG LVDD CPU LSI1 MSM6755B-13 LX0 ~ LX7 LY1 ~ LY7 Q1 ~ Q4 Q5 ~ Q8 Q2 ~ Q4 La ~ Lg (Common) (Segment) MWEB LED Latch IC3 7-segment LED Keyboard LEDs LED Latch IC2 MD0 ~ MD3 MD4 ~ MD7 MA0 Amp. IC301 Filter Block Q305 CPU LSI1 FILTER BLOCK Since the sound signal from the CPU is a stepped waveform,...

Page 8 - MAJOR WAVEFORMS

— 6 — 1 2 4 3 5 6 1 APO signal MSM6755B-13 pin 39 2 Reset signal RH5VL40AA pin 1 4 Sound signal JH connector pin 2 5 LED drive signal LX0 MSM6755B-13 pin 88 3 Clock MSM6755B-13 pin 32 6 LED drive signal LY1 MSM6755B-13 pin 81 Tone: Whistle (59)Key : A4 Key: D4 MAJOR WAVEFORMS

Page 9 - PRINTED CIRCUIT BOARDS

— 7 — 2 4 1 3 5 6 PRINTED CIRCUIT BOARDS Sub PCB KDM445-MA2M Top view Main PCB JCM446-MA1M Bottom view Top view GR 0 R 5 5 E R309 R324 VC JA3 5 5 D329 R354 Q305 C363 R353 R352 R342 5 5 125 5 5 75 125 125 225 C348 C342 C374 R326 R325 C341 C344 C350 IC301 C347 C345 C346 C349 R365 R339 C361 225 200 100...

Page 10 - SCHEMATIC DIAGRAMS

— 8 — Connected to KDM4910K-KY2M Connected to KDM445-LD2M Note: KI signals are renamed. (e.g. KI0 on the keyboard PCB ⇒ KI1 on the main PCB) NO USE FOR CTK-330 NO USE FOR CTK-330 NO USE FOR CTK-330 5 4 3 2 1 6 7 SCHEMATIC DIAGRAMS Main PCB JCM446-MA1M

Page 16 - EXPLODED VIEW

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

Page 17 - 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...

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