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: A4 5 Sound waveform (L-ch) Volume: JC connector pin 3 4 5 6 Button scan signal KO6 JA connector pin 14 7 Button scan signal KO7 JA connector pin 15 6 7 53.5 ° LCD Eye Watching the LCD at a 53.5 ° angle to the horizontal, adj 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. Terminal In/Out Function 1 NC - Not used 2 B.S.2. 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. In accordance with command from the CPU, the LSI is capable of displaying up to 16 character
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The LSI contains 240 graphic symbols in the built-in character generator ROM, and stores 80 characters in the built-in display data RAM.
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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 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 32 1 TA8248K IC101 Filter (L) Q104 Filter (R) Q105 Output VC VCC DVDD APO MD0 ~ MD7 MA0 ~ MA17 DC + 9 V IN DB4 ~ DB7 COM1 ~ COM16 SEG1 ~ SEG40 RS R/W E KO8 ~ KO12 KI0 ~ KI6 KO0 ~ K 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 steps, = 20 to 255) Chords: 2 fingering methods (CASIO CHORD, FINGERED) Rhythm controller: START/STOP, SYNCHRO/FILL-IN Accomp volume: 0 to 9 (10 steps) Это поможет Вам сохранять порядок в своей домашней базе инструкций обслуживания.ĮLECTRONIC 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 NORMAL 100 RHYTHMS 100 SONG BANK (00-49) TONE SONG BANK REW STOP FF 100 SONG BANK KEYBOARD MUSICAL INFORMATION SYSTEM SONG BANK CONTROLLER LEFT ON/OFF RIĬONTENTS Specifications.
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