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Casio CTK-680 Service Manual

Gm sound keyboard
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CTK-680
CTK-680
GM SOUND KEYBOARD

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Summary of Contents for Casio CTK-680

  • Page 1 CTK-680 CTK-680 GM SOUND KEYBOARD...

  • Page 2: Table Of Contents

    Rhythm patterns: Tempo: Adjustable (216 levels, = 40 to 255) Chords: 3 types (CASIO Chords, Fingered, Full-Range Chords) Parts: Rhythm, bass, Chord 1, Chord 2, Chord 3 (adjustable on/off, tone, volume, pan, effect send, fine tune, coarse tune, expression settings) Others:...
  • Page 3 Other functions Transpose: 25 levels (1 octave lower C to 1 octave upper C) Adjustable: A4 = 440 Hz ± 50 cents Tuning: Adjustable range: ± 12 semitones (bend up, bend down, bend saw) using Pitch Bender: musical pads Modulation: Vibrato setting and performances are done by a Musical pad.

  • Page 4: Block Diagram

    BLOCK DIAGRAM LC1 ~ LC4, LC8 LED Driver LED Driver 7-seg. LED IC301 Q15 ~ Q18 LEDs MIDI BA612 La ~ Lg, Lp KO1 ~ KO4, KO8 LD0 ~ Gate Array KO0 ~ LSI17 Buttons UPD65611GB-019 LSI14 Keyboard KI1 ~ KI4 HD6433294A33F Power Switch FI0 ~ FI7...

  • Page 5: Circuit Description

    CIRCUIT DESCRIPTION KEY MATRIX C2 (1) C#2 (1) D2 (1) D#2 (1) E2 (1) F2 (1) F#2 (1) G2 (1) C2 (2) C#2 (2) D2 (2) D#2 (2) E2 (2) F2 (2) F#2 (2) G2 (2) G#2 (1) A2 (1) A#2 (1) B2 (1) C3 (1)
  • Page 6 NOMENCLATURE OF KEYS F#3 G#3 A#3 F#4 G#4 A#4 C#5 D#5 F#5 G#5 A#5 C#4 D#4 C2 D2 G2 A2 C3 D3 G3 A3 B3 C4 D4 E4 B4 C5 D5 BUTTON MATRIX MODE PAD A PAD B PAD D TEMPO UP TEMPO DOWN START/STOP...
  • Page 7 CPU (LSI14: HD6433294A33F) The 16-bit CPU contains a 32k-bit ROM, a 1k-bit RAM, seven 8-bit I/O ports, an A/D convertor and MIDI interfaces. The CPU gains access to the working storage RAM, the DSP and the key controller. The CPU interprets MIDI message using the working storage RAM.
  • Page 8 Pin No. Terminal I n / O u t Function 1 ~ 8 CD0 ~ CD7 In/Out Data bus 9, 10 CE1, TRSB — Not used GND7 Ground (0 V) source CK16 Terminal for 24.576 MHz clock check point VCC6 +5 V source Clock input.
  • Page 9 Pin No. Terminal I n / O u t Function EOEB Read enable signal output for the effect RAM VCC7 +5 V source ECEB Chip select signal output for the effect RAM 113 ~ 117 ED11 ~ ED15 — Not used VCC4 +5 V source GND4...

  • Page 10: Second

    DAC (IC11: UPD6376GS) The DAC receives 16-bit serial data output from the DSP. The data contains digital sound data of the melody, chord, bass, and percussion for the right and left channels. The DAC converts the data into analog waveforms by each channel and output them separately. The following table shows the pin functions of IC11.
  • Page 11 The following table shows the pin functions of LSI16. Pin No. Terminal I n / O u t Function REQB Not used FI8 ~ FI10, 2, 3, 60 ~ 63 Not used. Connected to +5 V. SI8 ~ SI10 +5 V source CRDB Read enable signal input CWRB...
  • Page 12 GATE ARRAY (LSI17: UPD65611GB) The gate array provides chip enable signals for DSP, Key Controller, and Working Storage RAM. The LSI also generates scan signals of the button switches with K0O and K0C signals from the CPU. KI1 ~ KI4 To CPU KO0 ~ KO15 Button Switch...
  • Page 13 Pin No. Terminal I n / O u t Function SAMPB Working Storage RAM chip select signal 29, 30 D0, D1 Data bus 31 ~ 38, 40 ~ 43 A4 ~ A15 Address bus Clock pulse from CPU FILTER BLOCK Since the sound signals from the DAC are stepped waveforms, the filter block is added to smooth the waveforms.
  • Page 14 LED DRIVING LVDD La ~ Lg, Lp LD0 ~ LD7 Q15 ~ Q18 LSI14 LED Driver IC301 BA612 IC17 HD6433294A33F LED Driver UPD65611GB-019-3BA KO0 ~ KO3, KO5 Gate array RESET CIRCUIT When batteries are set or an AC adapter is connected, the reset IC provides a low pulse to the CPU. The CPU then initializes its internal circuit.

  • Page 15: Major Waveforms

    MAJOR WAVEFORMS 1 µs 1 µs 0.5 s 0.5 s ˜ ˜ CH1: 5 V CH2: 5 V CH1: 5 V CH2: 5 V CH3: 5 V CH1: 5 V CH2: 5 V CH3: 5 V CH1: 20 mV CH2: 20 mV 1 Voltage VDD 3 Power ON signal NMI B Word clock WOK1...

  • Page 16: Printed Circuit Boards

    PRINTED CIRCUIT BOARDS MAIN PCB JCM717-MA1M C146 R124 R123 R122 C103 LSI11 R121 R120 R119 R118 C141 R117 R116 C142 R115 R114 R113 FB51 C153 C152 R112 FB52 R111 R110 R109 MR17 R108 C143 R107 LSI15 R106 MR16 R105 R104 IC12 LSI14 R103...

  • Page 17: Schematic Diagrams

    SCHEMATIC DIAGRAMS MAIN PCB JCM717-MA1M 6 7 8 — 17 —...
  • Page 18 SUB PCB JCM716-MA2M — 18 —...
  • Page 19 CONSOLE PCB M716-CN1M — 19 —...
  • Page 20 KEYBOARD PCBs JCM617T-KY1M/KY2M — 20 —...

  • Page 21: Exploded View

    EXPLODED VIEW...

  • Page 22: Parts List

    PARTS LIST CTK-680 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. Prices and specifications are subject to change with- out prior notice.
  • Page 23 Item Code No. Parts Name Specification Main PCB 6925 7090 Main PCB ass'y, M717-MA1M M140443*2 LSI2 2012 5159 LSI, ROM MX23C2410MC-12CA54 LSI3 2012 0777 LSI, RAM LC33832M-70-TLM LSI7 2012 4298 LSI, UPD65611GB-019-3BA LSI11 2012 1316 LSI, DSP HG51B155FD-1 LSI14 2012 5152 LSI, CPU HD6433294A33F LSI15 2012 4291 LSI, RAM...
  • Page 24 Item Code No. Parts Name Specification 6922 2740 Black key set 10P M111726-1 6922 2750 Black key set 5P M111726-2 6922 2761 Key contact rubber LT-CB M211704A-1 6922 2771 Key contact rubber LT-CS M211705A-1 Panel unit 3831 0357 Speaker 1221AF 6921 5040 Slide knob M311860-1 6925 7210 Display plate...
  • Page 25 MA0100271A...

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