R (with price) CTK-750 CTK-750 ELECTRONIC KEYBOARD
CONTENTS Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Replacing the DSP (HG51A115A01FD) . . . . . . . . . . . . . . . . . . . . . 2 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Major Waveforms . . . . . . . . .
SPECIFICATIONS General Number of Keys: Polyphonic: Preset Tones: Keyboard Controls: Key Transpose: Auto-Rhythms: Auto-Accompaniment: Magical Preset Variations: Digital Effects: Sound/Control Pads: Pad Variations: Song Memories: Registration Memories: Registration Items: Tuning Control: Terminals: Built-In Speakers: Power Source: Auto Power Off: Power Consumption: Dimentions: Weight: Standard Accessory: 61 32-note 128 Tone Expander: Layer, Split Touch Response: On/Off Touch Sensitivity: Light/Middle/He
Electrical Current Drain with 12V DC: No Sound Output Maximum Volume 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 KΩ load each cannel): with key D4 pressed in FSynth-Bass-2 tone on L-ch with key G4 pressed in FSynth-Bass-2 tone on R-ch Phone Output Level (Vrms with 8 Ω load each channel): with key D4 pressed in FSynth-Bass-2 tone on L-ch with key G4 pressed in FSynth-Bass-2 tone on R-ch
BLOCK DIAGRAM 7-Segment LED LO0 ~ LO4 Keyboard FI0 ~ FI7 SI0 ~ SI7 LEDs LED driver BA612 Gate Array UPD65005C-578 KC0 ~ KC7 KO0 ~ KO7 LD0 ~ LD7 Buttons D0~D7 KI1 ~ KI7 CPU Key Touch LSI VDD HD6433298A18P HG52E35P A0 ~ A15 POWER A0 ~ A2 Power Switch IN OUT MIDI Working Strage RAM (256K-bit) HM62256ALP-10 A0 ~ A14 Effect RAM (256K-bit) HM62256ALP-10 APO A0 ~ A3 EA0 ~ EA14 RA0 ~ RA19 DSP Sound Source ROM (16M-bit) TC5316200CP-C081 HG51A115A01FD ED0 ~ ED7 RD0 ~ RD15 WCK1 SLOP BCK
CIRCUIT DESCRIPTION Key Matrix 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 2 A#2 2 B2 2 C3 2 C#3 2 D3 2 D#3 2 FI2 E3 1 F3 1 F#3 1 G3 1 G#3 1 A3 1 A#3 1 B3 1 SI2 E3 2 F3 2 F#3 2 G3 2 G#3 2 A3 2 A#3 2 B3 2 FI3 C4 1 C#4 1 D4 1 D#4 1 E4 1 F4 1 F#4 1 G4 1 SI3 C4 2 C#4 2 D4 2 D#4 2 E4 2 F4 2 F#4
Nomenclature of Keys C#2 D#2 C2 D2 E2 F#2 G#2 A#2 F2 G2 A2 B2 C#3 D#3 C3 D3 E3 F#3 G#3 A#3 F3 G3 A3 F#4 G#4 A#4 C#4 D#4 B3 C4 D4 E4 F4 G4 A4 B4 C#5 D#5 C5 D5 C#6 D#6 F#5 G#5 A#5 E5 F5 G5 A5 B5 D6 C6 E6 F#6 G#6 A#6 F6 G6 A6 B6 C7 Button Matrix KI1 KI2 KI3 KI4 KI5 KI6 KO0 Split Layer Upper 1 Lower 1 Lower 2 Upper 2 KO1 Transpose Tune MIDI Jack Rhythm Tone Play Style Track 4 Chord 1 Track 5 Chord 2 Track 6 Chord 3 Track 2 Rhythm Track 3 Bas
Initial reset 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 and clears data in the working strage RAM. Power ON reset When the power switch is pressed, the CPU receives a low pulse of POWER signal. The CPU first raises APO signal to +5V to generat DVDD voltage, then raises RESET signal to +5V. During this period the gate array, the DSP and the key touch LSI initializes their internal circuit.
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 scan / LED drive signals. The following table shows the pin functions of the gate array. Pin No.
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, chord, bass, and percussion to the DAC. The DSP also adds the selected effect to the sound data using a 256k-bit RAM.
Pin No. 93 94, 95 97 ~ 105 107,109 110, 112 96 106 108 111 113 ~ 117 118 119 120 ~ 122 123 ~ 130 131 132 ~ 134 135, 136 Terminal VCC5 In/Out In Function EA0 ~ EA14 Out Address bus for the effect RAM EWEB EOEB VCC7 ECEB Out Out In Out VCC4 GND4 In In ED0 ~ ED7 GND5 In/Out In Write enable signal output for the effect RAM Read enable signal output for the effect RAM +5V source Chip select signal output for the effect RAM Not used. +5V source Ground (0V) source Not sued.
DAC (UPD6376CX) UPD6376CX is a two-channel 16-bit Digital to Analog Convertor consisting of resistor string, output amplifier and zero offset circuit. Pin No. Terminal In/Out Function 1 SEL In Mode selection terminal. Connected to ground. 2 3 D.GND NC In Ground (0V) source for internal digital circuit Not used. 4 DVDD In +5V source for internal digital circuit 5 A.GND In Ground (0V) source for internal analog circuit 6 R.OUT Out Sound waveform output 7 8 9 10 11 12 13 14 15 16 A.
The following table shows the pin functions of the key touch LSI. Pin No. 1 2, 3 4 5 6 7 8, 9 10 11 12 13, 14 15 16 17 18 19 20 ~ 23, 25 ~ 28 24 29 ~ 31 32 33 ~ 39, 41 ~ 43 53 ~ 55, 57 ~ 63 40 44 ~ 47, 49 ~ 52 48, 56 64 Terminal REQB FI10, SI10 VCC CRDB CWRB CCBB T, STBY RESB W CKI TMD, TST CKO GND XIN XOUT TRES CD0 ~ CD7 GND CR0 ~ CR2 VCC FI0 ~ FI9, SI0 ~ SI9 VCC KC0 ~ KC7 GND VCC In/Out Out In In In In In In In In In In Out In In Out In In/Out In In In In Function Interrupt request. Not used.
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 IN11+ 3 IN11- 5 IN12- 4 Input Amp. - RL Short Protector Input Amp. 9 IN21- 7 IN22- 8 Power Amp. Pre-drive Amp. Terminal Protection Circuit 6 IN21+ Power Amp. Pre-drive Amp.
FI3 SI3 SI2 SI1 SI0 FI0 FI2 FI1 KC7 KC6 KC5 KC4 KC3 KC2 KC1 KC0 SI4 FI4 KC5 KC4 KC3 KC2 KC1 KC0 FI7 FI6 FI5 SI7 SI6 SI5 KC7 KC6 CA8 CA7 CA6 CA5 CA4 CA3 CA2 CA1 CB8 CB7 CB6 CB5 CB4 CB3 CB2 CB1 CC8 CC7 CC6 CC5 CC4 CC3 CC2 CC1 CD8 CD7 CD6 CD5 CD4 CD3 CD2 CD1 JE5 JE4 JE3 JE2 JE1 AG LMELO OUT RMELO OUT RMELO IN LMELO IN W O PR M615T-KY1M — 13 — Green A5712-MA1M Yellow PS M5172-MA2M Main Volume FI1 FI2 FI0 SI0 SI1 SI2 SI3 FI3 CC1 CC2 CC3 CC4 CC5 CC6 CC7 CC8 KC0 KC1 KC2 KC3 KC4 KC5 KC6 KC7 Blue
MAJOR WAVEFORMS — 14 —
— 15 —
PCB VIEW and MAJOR CHECK POINTS 28 1 27 26 24 25 29 22 14 15 16 17 23 13 19 12 — 16 — 20 21 2 18 6 3 5 4 7 8 9 10 11
SCHEMATIC DIAGRAMS Main PCB M5712-MA1M 7 23 11.4 25 5.3 5.2 11.6 11.6 5.9 10.9 2.6 2.6 3.2 21 18 19 20 2.6 0.0 11.6 5.3 0.7 2.6 10.9 24 0.0 22 5.2 2.6 5.2 0.0 2.6 2.6 5 3.2 2.6 5.1 11.8 11.0 5.8 1 13 5.2 12 3.4 14 15 6 16 17 4 29 28 0.7 27 5.3 2 8 0.
Console PCB M5712-CN1M — 18 —
Keyboard PCBs M615T-KY1M, KY2M — 19 —
EXPLODED VIEW — 20 —
IC LEAD IDENTIFICATION AND INTERNAL DIAGRAM LRSEL/RSI 14 SI/LSI 15 CLK 16 TIMING GENERATOR LRCK 13 SHIFT REGISTER LATCH UPD6376CX 4/8 fs SEL 1 MAIN DAC 11 L.OUT SUB DAC 10 L.REF SUB DAC 9 R.REF MAIN DAC 6 R.OUT D.GND 2 3 N.C. 4 D.VDD 5 12 A.GND 8 7 A.
Q4: 2SB1274 Q2: 2SD1762E,F B C Q1/6: 2SB1240Q,R E B E C C E Q3, Q5, Q7, Q11/12: 2SC1740SQ Q13: 2SA933SQ Q14~21: DTA114TS E B — 22 — C B
PARTS LIST CTK-750 Notes: 1. Prices and specifications are subject to change without 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.
N N N N N N N N N N N Item Code No.
N Item Code No. Parts Name Specification 2802 9231 Electrolytic capacitor 25RE3-2200-S1 2803 6743 Electrolytic capacitor 50RBP2-R22-T2-T 2803 6750 Electrolytic capacitor 50RBP2-R33-T2-T 2803 6757 Electrolytic capacitor 50RBP2-4R7-T2-T 2805 3061 Electrolytic capacitor 6.3RE2-220-T2-T 2805 3134 Electrolytic capacitor 10RE2-22-T2-T 2805 3142 Electrolytic capacitor 16RE2-10-T2-T 2807 1015 Electrolytic capacitor 16RE2-47-T2-T 2807 1040 Electrolytic capacitor 6.
N Item CC CD 1 2 3 4 5 6 7 8 9 10 N 11 12 N N N N N N 13 14 15 16 17 18 19 20 21 22 23 24 25 26 N N N 27 Code No.
N N N N Item Code No.
MA0300941A
