CTK-431 PHONES/ OUTPUT DC 9V IN MIDI OUT TONE RHYTHM SONG BANK STATUS TEMPO MAIN VOLUME MUSICAL INFORMATION SYSTEM POWER/MODE ON 100 SONG BANK KEYBOARD MUSICAL INFORMATION SYSTEM SONG BANK CONTROLLER MAIN SYNCHRO/ START/ VOLUME FILL-IN STOP SONG BANK CONTROLLER TEMPO CHORD BOOK FINGERED CASIO CHORD NORMAL OFF ACCOMP VOLUME M m 7 M7 dim 0 1 2 3 4 5 6 7 8 9 aug sus4 -5 add9 CLEAR TONE SONG BANK REW STOP LEFT ON/OFF RHYTHM TRANSPOSE/ TUNE/MIDI FF RIGHT ON/OFF PLAY/PAU
CONTENTS Specifications ................................................................................................................................... 1 Block Diagram .................................................................................................................................. 2 Circuit Description ............................................................................................................................ 3 Adjustment ................................................
SPECIFICATIONS GENERAL Keyboard: Tones: Polyphony: Auto accompaniment Rhythm patterns: Tempo: Chords: Rhythm controller: Accomp volume: Song bank Tunes: Controllers: Musical dictionary Name display: Tempo: Chord: Fingering: Song bank status: Staff: Keyboard: MIDI: Other functions Transpose: Tuning: Volume: Terminals MIDI terminals: Phones/Output terminal: Power supply terminal: Power supply Batteries: Battery life: AC adaptor: Auto power off: Speaker output: Power consumption: Dimensions (HWD): Weight: 49
BLOCK DIAGRAM COM1 ~ COM16 LCD Driver KS0066U-10B LSI3 LCD Buttons Keyboard SEG1 ~ SEG40 DB4 ~ DB7 Phones/Output Speaker (L) RS R/W E KO8 ~ KO12 KI0 ~ KI6 —2— Power Amp.
CIRCUIT DESCRIPTION KEY MATRIX KI0 KI1 KI2 KI3 KI4 KI5 KI6 KO0 C2 G#2 E3 C4 G#4 E5 C6 KO1 C#2 A2 F3 C#4 A4 F5 KO2 D2 A#2 F#3 D4 A#4 F#5 KO3 D#2 B2 G3 D#4 B4 G5 KO4 E2 C3 G#3 E4 C5 G#5 KO5 F2 C#3 A3 F4 C#5 A5 KO6 F#2 D3 A#3 F#4 D5 A#5 KO7 G2 D#3 B3 G4 D#5 B5 KO8 — + 0 Tempo Down Tempo Up Volume Down Volume Up KO9 3 2 1 Start/ Stop Synchro/ Fill-in Chord Book Accomp Volume KO10 6 5 4 Transpose/ Tune Song Bank Rhythm Tone K
CPU (LSI1: MSM6755C-17) The CPU reads sound data from the ROM in accordance with the pressed key and the selected tone; the CPU can read rhythm data simultaneously when a rhythm pattern is selected. Then it provides the left and the right channels’ waveforms separately, by converting the data into the waveforms with two built-in DACs. The CPU also controls key and button input. The following table shows the pin functions of LSI1. Pin No.
Pin No.
FILTER BLOCK Since the sound signals from the CPU is stepped waveforms, the filter block is added to smooth the waveforms. Amp. LA4598 Filter Block CPU MSM6755C-17 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 (0 V) source 2 Ch1 B.S. — Terminal for a bootstrap capacitor 3 Ch1 OUT Out 4 VCC In +9 V source 5 Ch1 N.F.
ADJUSTMENT MAIN PCB 1) Items to be adjusted: Item Measuring Instrument Vop voltage setting Voltmeter 2) Adjustment and Test Point Locations (TOP VIEW) (BOTTOM VIEW) VR1 TP1 3) Equipment connection/Procedure Vop voltage setting Set Voltmeter Output TP1 Input Connection Input Point Input Signal Adjust VR1 Output Connection Output Point Voltmeter TP1 Adjust for Adjust for 4.1 ~ 4.0 V reading on voltmeter under the temparature 20 ~ 25 °C.
MAJOR WAVEFORMS 1 2 3 1 Clock pulse MSM6755C-17 pin 32 4 2 +5 V source DVDD JB connector pin 4 3 APO signal JB connector pin 8 6 5 7 6 LCD common signal COM9 KS0066U-10B pin 55 7 LCD common signal COM10 KS0066U-10B pin 56 4 Button scan signal KO6 JA connector pin 14 5 Button scan signal KO7 JA connector pin 15 —8—
PRINTED CIRCUIT BOARDS Main PCB JCM444-MA1M 1 2 4 3 5 6 7 Top View Bottom View —9—
SCHEMATIC DIAGRAMS Main PCB JCM444-MA1M 2 3 4 6 1 7 — 10 — 5
Sub PCBs JCM444-MA2M/MA3M — 11 —
Keyboard PCBs JCM4911K-KY1M/KY2M — 12 —
COM7 COM6 COM5 COM4 COM3 COM2 COM1 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG21 SEG22 SEG23 SEG24 SEG25 SEG26 SEG27 SEG28 SEG29 SEG30 SEG31 SEG32 SEG33 SEG34 SEG35 SEG36 SEG37 SEG38 SEG39 SEG40 COM7 COM6 COM5 COM4 COM3 COM2 COM1 SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG21 SEG22 SEG23 SEG24 SEG25 SEG26 SEG27 SEG28 SEG29 SEG30 SEG31 SEG32 SEG33 SEG34 SEG35 SEG36 SEG37 SEG38 SEG39 SEG40 Common COM11 COM12 SEG39 SEG40 COM10 COM9 COM14 COM15 COM16 SEG11 SEG12 SEG13 SEG14 SEG15 SEG16 S
EXPLODED VIEW 22 R-1 5 8 6 9 16 10 18 7 17 12 14 11 15 13 1 19 2 R-2 23 4 R-3 20 4 21 R-4 R-5 3 — 14 —
PARTS LIST CTK-431 Notes: This parts list does not include the cosmetic parts, which parts are marked with item No. "R-X" in the exploded view. Contact our spare parts department if you need these parts for refurbish. 1. Prices and specifications are subject to change without prior notice. 2. As for spare parts order and supply, refer to the "GUIDEBOOK for Spare parts Supply", published seperately. 3. The numbers in item column correspond to the same numbers in drawing.
Item Code No.
CASIO TECHNO CO.,LTD. Overseas Service Division Nishi-Shinjuku Kimuraya Bldg.
