Contact our spare parts department if you need these parts for refurbish. Notes: This parts list does not include the cosmetic parts, which parts are marked with item No.
14 - LCD Segment 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 SEG23 SEG2. 11 - SCHEMA TIC DIAGRAMS Main PCB JCM442-MA1M 6 7 1 9 8 5 4 3 2. 9 - PRINTED CIRCUIT BOARDS Main PCB JCM442-MA1M Top View Bottom View 1 2 3 4 5 89 6 7. 8 - MAJOR W A VEFORMS 1 Clock pulse MSM6755B-17 pin 32 1 2 +5 V source DVDD JC connector pin 6 3 APO signal JC connector pin 5 2 3 4 Sound waveform (R-ch) Tone: Whistle JC connector pin 4 Key: A. Make fine adjustment accord- ing to the next instruction. 7 - 3) Equipment connection/Procedure Vop voltage setting Input Connection Input Point Input Signal Adjust Output Connection Output Point Adjust for VR1 Voltmeter V5 Adjust for 4.3 ± 0.1 V reading on voltmeter.
The following table shows the pin function of IC101.
POWER AMPLIFIER (IC101: TA8248K) The power amplifier is a two-channel amplifier with standby switch. 6 - FILTER BLOCK Since the sound signals from the CPU is stepped waveforms, the filter block is added to smooth the waveforms.
The LSI contains 240 graphic symbols in the built-in character generator ROM, and stores 80 characters in the built-in display data RAM.
5 - LCD DRIVER (LSI3: SED1278F0A) The LCD driver can drive a dot matrix LCD having 40 segment and 16 common lines. Then it provides the left and the right channels’ waveforms separately, by converting the data into the waveforms with two built-in DACs. 4 - CPU (LSI1: MSM6755B-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. 3 - CIRCUIT DESCRIPTION KEY MATRIX NOMENCLATURE OF KEYS 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. 2 - BLOCK DIAGRAM CPU MSM 6755B-17 LSI1 Keyboard Buttons LCD LCD Driver SED1278F0A LSI3 Reset IC IC1 Oscillator X1, Q1 Power Supply Circuit Q101 ~ Q103, D104 Power Amp. 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. ELECTRONIC KEYBOARD CTK-401 CTK-401 POWER/MODE FINGERED MAIN VOLUME SYNCHRO/ FILL-IN START/ STOP TEMPO CHORD BOOK M 01234 5 678 9 m 7 M7 dim aug sus4 -5 add9 CLEAR ACCOMP VOLUME CASIO CHORD ON OFF NOR.ĬONTENTS Specifications.