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Casio CTK-750 manual

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Table of contents for the manual

  • Page 1

    (with price) CTK-750 ELECTRONIC KEYBOARD R CTK-750[...]

  • Page 2

    — 14 — CONTENTS Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Replacing the DSP (HG51A115A01FD) . . . . . . . . . . . . . . . . . . . . . 2 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Circuit Description . . . . . . . . . . . . . . . . .[...]

  • Page 3

    — 1 — General Number of Keys: 61 Polyphonic: 32-note Preset Tones: 128 Tone Expander: Layer, Split Keyboard Controls: Touch Response: On/Off Touch Sensitivity: Light/Middle/Heavy Key Transpose: Range from F# to F by a half-note increment Auto-Rhythms: 128 Tempo Control: 40 to 255 Auto-Accompaniment: CASIO Chord/Fingered/Full-Range Chord Control[...]

  • Page 4

    — 2 — Electrical Current Drain with 12V DC: No Sound Output 390 mA ± 20% Maximum Volume 1700 mA ± 20% with white keys D2 to D3 pressed in Synth-Bass-2 tone and in Latin Fusion rhythm at initial setup tempo Volume; maximum, Touch: maximum Line Output Level (Vrms with 47 K Ω load each cannel): with key D4 pressed in FSynth-Bass-2 tone on L-ch[...]

  • Page 5

    — 3 — BLOCK DIAGRAM KC0 ~ KC7 SI0 ~ SI7 FI0 ~ FI7 Key Touch LSI HG52E35P Working Strage RAM (256K-bit) HM62256ALP-10 Working Strage RAM (256K-bit) HM62256ALP-10 7-Segment LED LO0 ~ LO4 LED driver BA612 LD0 ~ LD7 KO0 ~ KO7 Buttons KI1 ~ KI7 VDD Power Switch MIDI IN OUT EA0 ~ EA14 ED0 ~ ED7 DSP HG51A115A01FD RA0 ~ RA19 RD0 ~ RD15 Sound Source ROM[...]

  • Page 6

    — 4 — CIRCUIT DESCRIPTION Key Matrix Key Second contact 2 First contact 1 FI KC SI Note: Each key has two contacts, the first conatct 1 and second contact 2 . KC0 KC1 KC2 KC3 KC4 KC5 KC6 KC7 FI0 C2 1 C#2 1 D2 1 D#2 1 E2 1 F2 1 F#2 1 G2 1 SI0 C2 2 C#2 2 D2 2 D#2 2 E2 2 F2 2 F#2 2 G2 2 FI1 G#2 1 A2 1 A#2 1 B2 1 C3 1 C#3 1 D3 1 D#3 1 SI1 G#2 2 A2 [...]

  • Page 7

    — 5 — Nomenclature of Keys F#3 G#3 A#3 C#4 D#4 F#4 G#4 A#4 C#5 D#5 F#5 G#5 A#5 F3 G3 A3 B3 C4 D4 E4 F4 G4 A4 B4 C5 D5 E5 F5 G5 A5 B5 C6 D#3 C2 D2 E2 F2 G2 A2 B2 C3 D3 E3 B6 A6 G6 F6 E6 D6 C7 C#3 A#2 G#2 F#2 D#2 C#2 A#6 G#6 F#6 D#6 C#6 Button Matrix KI1 KI2 KI3 KI4 KI5 KI6 KI7 KO0 Split Layer Upper 1 Lower 1 Lower 2 Upper 2 KO1 Transpose Tune MI[...]

  • Page 8

    — 6 — Pin No. Terminal In/Out Function 1 P40 Out KO signal data output 2 P41 Out Clock for KO signal data 3 P42 Out APO (Auto Power Off) signal output. ON: High, OFF: Low 4 P43 Out Read enable signal output 5 P44 Out Write enable signal output 6 P45 Not used. 7 P46 Out 10MHz clock output 8 P47 In Wait signal input. Connected to +5V. 9 TXD Out M[...]

  • Page 9

    — 7 — Gate Array (UPD65005C-578) Functions of the gate array are; (1) To decode chip select signals for the working strage RAM, the DSP and the key touch LSI. (2) To hold the following signals on "Low" during power off. Read/write enable signals for the DSP and the key touch LSI 10MHz clock for the key touch LSI (3) To generate button[...]

  • Page 10

    — 8 — Digital Signal Processor (HG51A115A01FD) Upon receipt of note numbers and their velocities, the DSP reads sound and velocity data from the sound source ROM in accordance with the selected tone; the DSP can read rhythm data simultaneously when a rythm pattern is selected. Then it provides 16-bit serial signals containing data of the melody[...]

  • Page 11

    — 9 — DSP HG51A115A01FD Effect RAM (256K-bit) HM65256BLP Sound Source ROM TC5316200CP-C081 CE A0 ~ A19 D0 ~ D15 RA0 ~ RA19 RD0 ~ RD15 RA22 D0 ~ D7 A0 ~ A3 LSIS RDAPO WRAPO RESET SOLP BOK WOK1 EA0 ~ EA14 ED0 ~ ED15 CS WE OE D0 ~ D15 A0 ~ A14 ECEB EOEB EWEB PG 16.384MHz DAC UPD6376CX LOUT ROUT SOLP: Sound data BOK: Bit clock WOK1: Word clock SI C[...]

  • Page 12

    — 10 — DAC (UPD6376CX) UPD6376CX is a two-channel 16-bit Digital to Analog Convertor consisting of resistor string, output amplifier and zero offset circuit. Key Touch LSI (HG52E35P) By counting the time between first-key input signal FI and second-key SI from the keyboard unit, the key touch LSI detects key velocity of 256-step. Then the LSI s[...]

  • Page 13

    — 11 — The following table shows the pin functions of the key touch LSI. Pin No. Terminal In/Out Function 1 REQB Out Interrupt request. Not used. 2, 3 FI10, SI10 In Key input signal 4 VCC In +5V source 5 CRDB In Read enable signal 6 CWRB In Write enable signal 7 CCBB In Chip select signal 8, 9 T, STBY In Not used. Connected to +5V. 10 RESB In R[...]

  • Page 14

    — 12 — Power Amplifier (LA4620) The power amplifier is a two-channel balanced amplifier with standby switch. The following figure shows the internal diagram of the amplifier. Internal Diagram of LA4620 Input Amp. Pre-drive Amp. Power Amp. RL Short Protector Input Amp. Pre-drive Amp. Power Amp. Terminal Protection Circuit Ripple Filter Pop Noise[...]

  • Page 15

    — 13 — WIRING DIAGRAM FI1 FI2 FI0 SI0 SI1 SI2 SI3 FI3 KC0 KC1 KC2 KC3 KC4 KC5 KC6 KC7 KC0 KC1 KC2 KC3 KC4 KC5 FI4 SI4 KC6 KC7 SI5 SI6 SI7 FI5 FI6 FI7 LG PWLD KO7 KO6 KO5 KO4 KO3 KO2 KO1 KO0 POWER KI1 KI2 KI3 KI4 KI5 KI6 KI7 La Lb Lc Ld Le Lf Lg Lp M615T-KY2M M615T-KY1M CD1 CD2 CD3 CD4 CD5 CD6 CD7 CD8 CC1 CC2 CC3 CC4 CC5 CC6 CC7 CC8 CB1 CB2 CB3 [...]

  • Page 16

    — 14 — MAJOR W A VEFORMS[...]

  • Page 17

    — 15 —[...]

  • Page 18

    — 16 — 1 21 9 10 11 27 26 29 14 15 16 17 13 12 2 6 3 5 4 7 8 28 24 25 19 22 23 20 18 PCB VIEW and MAJOR CHECK POINTS[...]

  • Page 19

    — 17 — 11.6 11.6 11.4 10.9 10.9 5.2 0.0 0.0 0.0 0.7 5.3 5.3 2.6 2.6 2.6 2.6 2.6 2.6 2.6 2.6 5.9 11.6 11.8 5.1 5.8 5.2 5.3 0.7 0.0 5.2 5.2 3.2 3.2 3.4 11.0 1 2 3 4 5 6 12 13 18 25 26 27 28 29 24 22 23 19 7 8 9 10 11 14 15 16 17 21 20 SCHEMA TIC DIAGRAMS Main PCB M5712-MA1M[...]

  • Page 20

    — 18 — Console PCB M5712-CN1M[...]

  • Page 21

    — 19 — Keyboard PCBs M615T -KY1M, KY2M[...]

  • Page 22

    — 20 — EXPLODED VIEW[...]

  • Page 23

    — 21 — IC LEAD IDENTIFICA TION AND INTERNAL DIAGRAM TIMING GENERATOR SHIFT REGISTER LATCH MAIN DAC SUB DAC SUB DAC MAIN DAC LRCK LRSEL/RSI SI/LSI CLK 4/8 fs SEL D.GND N.C. D.VDD A.GND A.VDD R.OUT R.REF L.REF L.OUT 11 10 9 6 8 7 12 5 4 3 13 14 15 16 1 2 3 2 1 OUT VDD VSS 12 3 4 5 6 VCC GND NC + - + - 12 34 5 6 7 8 VCC GND 1A 1 1Y 2 2A 3 2Y 4 3A [...]

  • Page 24

    — 22 — B C E B C E E C B E C B Q2: 2SD1762E,F Q4: 2SB1274 Q3, Q5, Q7, Q11/12: 2SC1740SQ Q13: 2SA933SQ Q14~21: DTA114TS Q1/6: 2SB1240Q,R[...]

  • Page 25

    P ARTS LIST CTK-750 Notes: 1. Prices and specifications are subject to change with- out prior notice. 2 . As for spare parts order and supply , refer to the "GUIDEBOOK for Spare parts Supply", published separately . 3. The numbers in item column correspond to the same numbers in drawing.[...]

  • Page 26

    FOB Japan N Item Code No. Parts Name Specification Q M N.R.Yen R * Unit Price PCB Ass'y M5712-MA1M 2010 4928 LSI HM65256BLP-10 1 1 720 A H 2011 3325 LSI UPD6376CX 1 1 230 A C 2011 5194 LSI HG52E35P 1 1 600 A F 2011 5201 LSI HG51A115A01FD 1 1 2,820 A T N 2011 5810 LSI UPD43256AC-85L,10L 1 1 620 A F N 2011 6867 LSI UPD65005C-578 1 1 220 A C N 20[...]

  • Page 27

    FOB Japan N Item Code No. Parts Name Specification Q M N.R.Yen R * Unit Price 2802 9231 Electrolytic capacitor 25RE3-2200-S1 2 10 75 C A N 2803 6743 Electrolytic capacitor 50RBP2-R22-T2-T 2 20 16 C A N 2803 6750 Electrolytic capacitor 50RBP2-R33-T2-T 2 20 16 C A N 2803 6757 Electrolytic capacitor 50RBP2-4R7-T2-T 2 20 18 C A 2805 3061 Electrolytic c[...]

  • Page 28

    FOB Japan N Item Code No. Parts Name Specification Q M N.R.Yen R * Unit Price 3637 5220 Ferrite core ZCAT2032-0930 1 1 170 C B 4317 3820 Blank PCB M615T-KY1M M111575-1 1 1 260 C C 6921 8590 PCB ass'y M615T-KY1M M111608*1 1 1 870 B I 6921 9460 Sponge 60x400 M412219-1 1 10 50 C A PCB Ass'y M615T-KY2M 2301 0101 Diode 1S2473T-77-T 58 20 8 C A[...]

  • Page 29

    FOB Japan N Item Code No. Parts Name Specification Q M N.R.Yen R * Unit Price 27-1 6902 6140 Battery spring 90 M41226-1 1 10 27 B A 27-2 6903 2150 Battery spring B M41330-1 1 10 18 B A 27-3 6919 3190 Key damper 61 M411615-1 1 5 55 B A 6917 9300 Rubber foot M41109-3 5 20 6 C A 6920 2290 Clip CS-3 2 20 9 C A N 6921 5490 Sponge 425X54 M412141-1 1 10 4[...]

  • Page 30

    MA0300941A[...]