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Casio CTK-401 manual

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Table of contents for the manual

  • Page 1

    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 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 RI[...]

  • Page 2

    CONTENTS Specifications ................................................................................................................................... 1 Block Diagram .................................................................................................................................. 2 Circuit Description .........................[...]

  • Page 3

    — 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)[...]

  • Page 4

    — 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. 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[...]

  • Page 5

    — 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[...]

  • Page 6

    — 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. Then it provides the left and the right channels’ waveforms separately, by converting the data into the waveforms with two built-in DACs. T[...]

  • Page 7

    — 5 — LCD DRIVER (LSI3: SED1278F0A) The LCD driver can drive a dot matrix LCD having 40 segment and 16 common lines. The LSI contains 240 graphic symbols in the built-in character generator ROM, and stores 80 characters in the built-in display data RAM. In accordance with command from the CPU, the LSI is capable of displaying up to 16 character[...]

  • Page 8

    — 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: TA8248K) 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 NC — Not used 2 B.S.2 — [...]

  • Page 9

    — 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. Make fine adjustment accord- ing to the next instruction. 53.5 ° LCD Eye Watching the LCD at a 53.5 ° angle to the horizontal, adj[...]

  • Page 10

    — 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[...]

  • Page 11

    — 9 — PRINTED CIRCUIT BOARDS Main PCB JCM442-MA1M Top View Bottom View 1 2 3 4 5 89 6 7[...]

  • Page 12

    — 11 — SCHEMA TIC DIAGRAMS Main PCB JCM442-MA1M 6 7 1 9 8 5 4 3 2[...]

  • Page 13

    — 12 — Sub PCB JCM442-MA2M[...]

  • Page 14

    — 13 — Keyboard PCBs KDM4910K-KY1M/KY2M[...]

  • Page 15

    — 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 SEG24 SEG25 SEG26 SEG27 SEG28 SEG29 SEG30 SEG31 SEG32 SEG33 SEG34 SEG35 SEG36 SEG37 SEG38 SEG39 SEG40 SEG1 SEG12 SEG13 SEG14 SEG15 SEG16 SEG17 SEG18 SEG19[...]

  • Page 16

    — 15 — EXPLODED VIEW 18 14 13 15 12 11 19 17 16 10 R-1 R-2 R-3 5 6 8 7 9 4 R-4 R-6 R-5 4 3 1 2[...]

  • Page 17

    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. 2 . As for spare parts order and supply, refer to the "GUIDEB[...]

  • Page 18

    Item Code No. Parts Name Specification Q R Main PCB 1 6926 0200 PCB/ASS'Y (MA1M) M240592*1 1 B LSI1 2012 5603 LSI/MC (CPU) MSM6755B-17 1 A LSI2 2012 5611 LSI/MASK-ROM UM23C2101M-7384/Q 1 A LSI3 2012 5569 LSI/LCD DRIVER SED1278F0A 1 A IC1 2012 1883 IC/MOS (RESET IC) RN5VD40AA-TR 1 B Q1 2252 1239 TRANSISTOR 2SC4081T106Q 1 B VR1 2775 3286 POTENTI[...]

  • Page 19

    MA0600571A[...]