Casio CTK-620L- Manuals

Page 2 - SPECIFICATIONS; GENERAL; CONTENTS

— 1 — SPECIFICATIONS GENERAL Keyboard: 61 standard-size keys, 5 octaves (with touch response on/off) Key light system: Can be turned on and off (up to 10 keys can be lit at the same time) Tones: 137 (128 General MIDI tones + 9 drum tones); with layer and split Rhythm instrument tones: 61 Polyphony: ...

Page 4 - BLOCK DIAGRAM

— 3 — BLOCK DIAGRAM KC0 ~ KC7 FI0 ~ FI7SI0 ~ SI7 KI0 ~ KI2 MD0 ~ 3 L0 ~ L20 L21 ~ L23 MA0 ~ 2 PO10, PO17PO22, PO23 PA4 ~ PA6 Working Storage RAM (256K-bit) LSI4 TC55257DFL-70L(EL) MIDI EA0 ~ EA14 EIO0 ~ EIO7 Sound Source ROM (24M-bit) LSI3 LH536PNV LRCKSOBCK D/A Converter LSI6 UPD6379GR-E1 Filter Q2...

Page 5 - CIRCUIT DESCRIPTION; KEY MATRIX

— 4 — CIRCUIT DESCRIPTION KEY MATRIX BUTTON MATRIX KC0 KC1 KC2 KC3 KC4 KC5 KC6 KC7 FI0 C2 (1) C#2 (1) D2 (1) D#2 (1) E2 (1) F2 (1) F#2 (1) G2 (1) SI0 C2 (2) C#2 (2) D2 (2) D#2 (2) E2 (2) F2 (2) F#2 (2) G2 (2) FI1 G#2 (1) A2 (1) A#2 (1) B2 (1) C3 (1) C#3 (1) D3 (1) D#3 (1) SI1 G#2 (2) A2 (2) A#2 (2) ...

Page 6 - LED MATRIX

— 5 — LED MATRIX Key Second contact (2) First contact (1) FI KC SI Note: Each key has two contacts, the first conatct (1) and second contact (2). 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...

Page 7 - POWER SUPPLY CIRCUIT

— 6 — e m a N e g a t l o V f o n o i t a r e p o r o F D D V V 5 + , M A R t c e f f E , M A R e g a r o t s g n i k r o W , M O R e c r u o s d n u o S , P S D , C I t e s e R , U P C r e v i r d D E L D D V D V 5 + U P C k c a j I D I M , k c a j n i a t s u S , D D V A V 5 + r e t li F , C A D D...

Page 12 - FILTER BLOCK

— 11 — FILTER BLOCK Since the sound signals from the DAC are stepped waveforms, the filter block is added to smooth thewaveforms. POWER AMPLIFIER (IC101: TA8248K) The power amplifier is a two-channel amplifier with standby switch.The following table shows the pin function of IC101. 2.2K 820PF 8.2 µ ...

Page 13 - ADJUSTMENT; DISPLAY PCB

— 12 — 3) Equipment connection/Procedure Vop voltage setting Output Set Voltmeter TP3 37.6 ° LCD Eye Watching the LCD at a 37.6 ° angle to the horizontal, adjust Vop voltage so that unenergized segments are seen dimly. ADJUSTMENT DISPLAY PCB 1) Items to be adjusted: m e t I t n e m u r t s n I g n i...

Page 14 - MAJOR WAVEFORMS

— 13 — MAJOR WAVEFORMS 1 Clock signal B1Test point T5 2 Clock signal B2Test point T6 7 Key common signal KC0JM connector pin 9 8 Key common signal KC1JM connector pin 8 3 MNI signalJM connector pin 18 4 APOFF signal JS connector pin 12 5 LED common signal L23JN connector pin 1 6 LED common signal L2...

Page 15 - PRINTED CIRCUIT BOARDS; Top View

— 14 — PRINTED CIRCUIT BOARDS Sub PCB JCM447-MA2M Top View Bottom View Main PCB JCM447-MA1M 1 2 3 7 8 5 6 9 12 10 11 4

Page 16 - SCHEMATIC DIAGRAMS

— 15 — SCHEMATIC DIAGRAMS Main PCB JCM447-MA1M AT-49-30M 4 11 1 12 7 8 3 5 6 2 10 9

Page 29 - EXPLODED VIEW

— 28 — R-4 22 12 R-3 13 6 8 7 R-2 2 3 1 4 23 31 5 32 24 25 27 26 29 20 21 30 R-1 33 34 9 10 11 18 19 31 34 28 17 16 14 15 EXPLODED VIEW

Page 30 - 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...