Instruction/ maintenance manual of the product casio electronic keyboard Casio
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ELECTRONIC KEYBOARD CTK-431 CTK-431 MIDI 100 SONG BANK KEYBOARD MUSICAL INFORMATION SYSTEM SONG BANK CONTROLLER POWER/MODE ON OFF FINGERED MAIN VOLUME SYNCHRO/ FILL-IN START/ STOP TEMPO CHORD BOOK ACC.
CONTENTS Specifications ................................................................................................................................... 1 Block Diagram ...............................................................................
— 1 — SPECIFICA TIONS GENERAL Keyboard: 49 standard-size keys, 4 octaves Tones: 100 Polyphony: 12 notes maximum (6 for certain tones) Auto accompaniment Rhythm patterns: 100 Tempo: Variable (236 s.
— 2 — BLOCK DIAGRAM CPU MSM 6755C-17 LSI1 Keyboard Buttons LCD LCD Driver KS0066U-10B LSI3 Reset IC IC1 Oscillator X1, Q1 Power Supply Circuit Q101 ~ Q103, D104 Power Amp.
— 3 — 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#.
— 4 — 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.
— 5 — Pin No. Terminal In/Out Function 74 ~ 77 DB4 ~ DB7 Out Data bus for the LCD driver 78 NC9 — Not used 79 LVCC In +5 V source 80 ~ 84 KO8 ~ KO12 Out Terminals for button scan signal 85 ~ 87 .
— 6 — FILTER BLOCK Since the sound signals from the CPU is stepped waveforms, the filter block is added to smooth the waveforms. POWER AMPLIFIER (IC101: LA4598) The power amplifier is a two-channel amplifier with standby switch. The following table shows the pin function of IC101.
— 7 — Item Measuring Instrument Vop voltage setting Voltmeter 3) Equipment connection/Procedure Vop voltage setting Input Connection Input Point Input Signal Adjust Output Connection Output Point Adjust for VR1 Voltmeter TP1 Adjust for 4.1 ~ 4.0 V reading on voltmeter under the temparature 20 ~ 25 ° C.
— 8 — MAJOR W A VEFORMS 1 Clock pulse MSM6755C-17 pin 32 1 2 +5 V source DVDD JB connector pin 4 3 APO signal JB connector pin 8 2 3 4 Button scan signal KO6 JA connector pin 14 5 Button scan sign.
— 9 — 3 2 7 6 4 5 1 Top View PRINTED CIRCUIT BOARDS Main PCB JCM444-MA1M Bottom View.
— 10 — SCHEMA TIC DIAGRAMS Main PCB JCM444-MA1M 1 5 4 2 3 7 6.
— 11 — Sub PCBs JCM444-MA2M/MA3M.
— 12 — Keyboard PCBs JCM4911K-KY1M/KY2M.
— 13 — LCD Segment Common COM7 COM6 COM5 COM4 COM3 COM2 COM1 SEG2 COM11 COM12 SEG39 SEG40 COM10 COM9 COM14 COM15 COM16 SEG11 NC NC NC COM16 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG21 SEG22 SEG.
— 14 — EXPLODED VIEW 18 17 19 22 6 R-1 5 12 7 10 9 11 13 14 15 16 8 1 2 23 4 21 20 4 R-3 R-5 3 R-4 R-2.
— 15 — 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 with- out prior notice.
— 16 — Item Code No. Par t Name Specification Q R Main PCB 1 6926 7070 PCB/ASSY (MA1M) M240832*1 1 B LSI1 2012 5603 LSI/MC (CPU) MSM6755B-17 1 A LSI2 2012 5611 LSI/MASK-ROM UM23C2101M-7384/Q 1 A L.
CASIO TECHNO CO.,LTD. Overseas Service Division Nishi-Shinjuku Kimuraya Bldg. 1F 5-25, Nishi-Shinjuku 7-Chome Shinjuku-ku, Tokyo 160-0023, Japan.
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