CASIO CTK-630 ELECTRONIC KEYBOARD Repair Manual

ELECTRONIC KEYBOARD (with price) CTK-630 CONTENTS Page Specifications ................................................................................................................................... 2 Block Diagram .................................................................................................................................. 3 Circuit Description ............................................................................................................................ 4 Troubleshooting ............................................................................................................................. 10 Major Waveforms ........................................................................................................................... 11 Printed Circuit Boards .................................................................................................................... 12 Schematic Diagrams ...................................................................................................................... 13 Exploded View ............................................................................................................................... 16 Parts List ........................................................................................................................................ 17

— 2 — ELECTRICAL Nominal Limit Current drain with 9 V DC: No sound output 220 mA 220 mA ± 30 % Maximum volume 900 mA 900 mA ± 30 % with white keys C4 to G5 pressed in Recorder tone Volume: maximum, Touch response: maximum Layer: On, Reberv: Off Phone output level (Vrms with 8 Ω load each channel): with key C4 pressed in Recorder tone 125 mV 125 mV ± 30 % Sound pressure (at 10 cm away from speaker): with key A3 pressed in Recorder tone 98 dB 98 dB ± 10 dB Minimum operating voltage: 5.8 V 6.0 V SPECIFICATIONS GENERAL Number of keys: 61 Polyphonic: 24-note Preset tones: 100, Tone expander: Layer On/Off, Split On/Off Keyboard controls: Touch response: On/Off, Key transpose: Range from F# to F by a semitone increment, Pitch bend: 12 steps up and down (a seminote at muximum) Auto-rhythms: 100, Tempo control: 40 to 255 Auto-accompaniment: Mode: CASIO Chord/Fingered/Full-Range Chord 1/ Full-Range Chord 2 Controller: Intro/Fill-In, Synchro/Ending, Normal/Variation Easy presets: 50, including — Free Session (Chord): 30, Free Session (Song): 10, Melody Composition: 10 Reverb effects: Hall/Stage/Room Musical pads: 8 Pad variations: 50, including — Pops: 10, Rock: 10, Jazz/Fusion: 10, Dance/Funk: 10 European: 2, Latin/Various: 5, Drums/Percussion: 5 Song memory: 3, Real-time recording, Memory capacity: Approx. 1200 notes in total Demo tunes: 3, including — A Night has 9000 Bars (arranged and programmed by Thomas Hirsch), Wanting This (Edward Alstrom), Supersonic Remorse (Edward Alstrom) Demo tune program: Repeat/Skip Tuning control: 440Hz ± 50 cents Built-in speakers: 12 cm dia. 2 W input rating: 2 pcs. MIDI: 16 multi-channel reception Terminals: Phone Jack [Output impedance: 90 Ω, Output voltage: 4.6 V(rms) MAX], Sustain Jack, MIDI Jacks (IN, OUT), AC Adapter Jack (9 V) Auto power off: Approximately 6 minutes after the last operation Power source: 2-way AC or DC source AC: AC adapter DC: 6 D size dry batteries Power consumption: 7.7 W Dimensions (HWD): 104 x 931 x 353 mm (4-1/16 x 36-5/8 x 13-7/8 inches) Weight: 4.7 kg (10.4 lbs) including batteries

— 3 — BLOCK DIAGRAM KC0 ~ KC7 FI0 ~ FI10 SI0 ~ SI19 Working Storage RAM (64K-bit) LSI103 SRM2264LM90 MIDI EA0 ~ EA12 EIO0 ~ EIO7 Sound Source ROM (16M-bit) LSI104 MX23C1610MC- 12CA20 LRCK SO BCK D/A Converter IC102 UPD6379GR Filter Q108, Q109 Q119, Q120 Main Volume Power Amplifier IC101 LA4598 LED driver IC103 BA612 Keyboard MA0 ~ MA19 Power Supply Circuit Q101 ~ Q106 D101, D103, D104 VCC AVDD VDD LVDD DVDD VC APO Effect RAM (64K-bit) LSI102 SRM2264LM90 MD0 ~ MD7 Speakers Output MA0 ~ MA12 MA0, MA1 LEDs / 7Seg. LED LED driver Q110 ~ Q117 La ~ Lg, Lp IN OUT Reset IC IC105 RE5VA35AA RESET LC0 ~ LC4 Buttons VDD Power Switch PA0 ~ PA7 PB0 ~ PB4 CPU LSI105 UPD912GF-3BA BCK, SO, LRCK DSP LSI101 HG51B227FB FI8 ~ FI10, SI8 KI0 ~ KI2 MD0 ~ MD15

— 4 — 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 (2) G4 (2) FI4 G#4 (1) A4 (1) A#4 (1) B4 (1) C5 (1) C#5 (1) D5 (1) D#5 (1) SI4 G#4 (2) A4 (2) A#4 (2) B4 (2) C5 (2) C#5 (2) D5 (2) D#5 (2) FI5 E5 (1) F5 (1) F#5 (1) G5 (1) G#5 (1) A5 (1) A#5 (1) B5 (1) SI5 E5 (2) F5 (2) F#5 (2) G5 (2) G#5 (2) A5 (2) A#5 (2) B5 (2) FI6 C6 (1) C#6 (1) D6 (1) D#6 (1) E6 (1) F6 (1) F#6 (1) G6 (1) SI6 C6 (2) C#6 (2) D6 (2) D#6 (2) E6 (2) F6 (2) F#6 (2) G6 (2) FI7 G#6 (1) A6 (1) A#6 (1) B6 (1) C7 (1) SI7 G#6 (2) A6 (2) A#6 (2) B6 (2) C7 (2) FI8 Pad A (1) Pad B (1) Pad C (1) Pad D (1) Pad E (1) Pad F (1) Pad G (1) Pad H (1) SI8 Pad A (2) Pad B (2) Pad C (2) Pad D (2) Pad E (2) Pad F (2) Pad G (2) Pad H (2) FI9 Intro/ Fill-In Synchro/ Ending Start/ Stop FI10 Bend Up Bend Down Normal/ Variation Tempo Up Tempo Down Accomp. Volume Up Accomp. Volume Down KI0 Mode Reverb 0 1 4 7 Layer Split KI1 Rhythm Tone – 2 5 8 Transpose Tune/MIDI Demo KI2 Easy Preset Pad + 3 6 9 Memory Touch Response CIRCUIT DESCRIPTION KEY MATRIX

— 5 — Key Second contact (2) First contact (1) FI KC SI Reset IC IC105 RE5VA35AA DSP LSI101 HG51B227FB VDD Reset signal VDD Battery set RESET VDD POWER From power switch NMI APO PLE CPU LSI105 UPD912GF-3BA SCKO Note: Each key has two contacts, the first conatct (1) and second contact (2). POWER SUPPLY CIRCUIT The power supply circuit generates six voltages as shown in the following table. VDD voltage is always generated. The others are controlled by APO signal from the CPU. NOMENCLATURE OF KEYS 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, and clears the working storage RAM. When the power switch is pressed, the CPU receives a low pulse of POWER signal. The CPU sends APO signal to supply ground source for the DSP, also sends a reset signal to the DSP. Name Voltage For operation of VDD +5 V CPU, Reset IC, DSP, Sound source ROM, Working storage RAM, Effect RAM DVDD +5 V Power jack, Sustain jack, MIDI jack AVDD +5V DAC, Filter LVDD +4.5 V LED Driver VCC +9 V Power amplifier, Pilot lamp VC +9 V Power amplifier 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

— 6 — CPU (LSI105: UPD912GF-3BA) The 16-bit CPU contains a 1k-byte RAM, three 8-bit I/O ports, two timers, a keycontroller and serial interfaces. The CPU detects key velocity by counting the time between first-key input signal FI and second-key SI from the keyboard. The CPU reads sound data and velocity data from the sound source ROM in accordance with the selected tone; the CPU can read rhythm data simultaneously when a rhythm pattern is selected. Then the CPU provides 16-bit serial sound data to the DSP. The CPU also controls MIDI input/output and stores sequencer data into the working storage RAM. The following table shows the pin functions of LSI105. Pin No. Terminal In/Out Function 1 TXD0 Out MIDI signal input 2 RXD0 In MIDI signal output 3 SCK0 Out APO (Auto Power Off) signal output 4, 5 TXD1, RXD2 — Not used. Connected to ground. 6 SCK1 Out 1 MHZ synchronizing pulse output 7 AVCC In Ground (0 V) source 8, 9 AN0, AN1 — Not used. Connected to ground. 10 AGND In Ground (0 V) source 11 BCK Out Bit clock output 12 SO Out Serial sound data output 13 LRCK Out Word clock output 14 GND In Ground (0 V) source 15, 16 XLT0, XLT1 In/Out 20 MHz clock input/output 17 VCC In +5 V source 18, 19 MD0, MD1 In Mode selection terminal 20 RSTB In Reset signal input 21 NMI In Power ON signal input 22 INT — Not used. Connected to ground. 23 ~ 30 FI0 ~ FI3 SI0 ~ SI3 In Terminal for key input signal 31 ~ 38 KC0 ~ KC7 Out Terminal for key scan signal 39 ~ 46 FI4 ~ FI7 SI4 ~ SI7 In Terminal for key input signal 47, 48 FI8, SI8 In Terminal for pad input signal 49 FI9 In Terminal for button input signal 50 SI9 In Sustain signal input 51 FI10 In Terminal for button input signal 52 SI10 In Not used 53 ~ 55 KI0 ~ KI2 In Terminal for button input signal 56 MWNB Out Write enable signal output 57 ~ 76 MA0 ~ MA17 Out Address bus 77 MCSB0 Out Chip enable signal output for the sound source ROM 78 MCSB1 Out Not used 79 MCSB2 Out Chip enable signal output for the DSP

— 7 — DIGITAL SIGNAL PROCESSOR (LSI101: HG51B227FB) The DSP receives 16-bit serial sound data output from the CPU and adds the selected effect to the sound data using the effect RAM. Then the DSP provides the sound data to the DAC. The DSP contains two I/O ports, which controls LEDs. The following table shows the pin functions of LSI101. Pin No. Terminal In/Out Function 80 VCC In +5 V source 81 GND In Ground (0 V) source 82 MRDB Out Read enable signal output for the sound source ROM 83 ~ 98 MD0 ~ MD15 In/Out Data bus 99 PLE Out Reset signal output for the DSP 100 P17 In APO cancellation signal input Pin No. Terminal In/Out Function 1 ~ 4, 80 PB0 ~ PB4 Out LED drive signal output 5 SO Out Serial sound data output for the DAC 6 WCKO Out Word clock output for the DAC 7 VDD3 In +5 V source 8 TEST — Not used. 9 RESB In Reset signal input 10 VSS2 In Ground (0 V) source 11, 12 XIN, XOUT In/Out 16 MHz clock input/output 13 WCKI In Word clock input from the CPU 14 SI In Serial sound data input from the CPU 15 BCKI In Bit clock input from the CPU 16 SINC In 1 MHz synchronizing pulse input 17 VDD2 In +5 V source 18 ~ 25 IO0 ~IO7 In/Out Data bus 26 RCEB Out Chip enable signal output for the working storage RAM 27 VSS3 In Ground (0 V) source 28 AD1 In Address bus 29 OEB In Not used. Connected to +5 V source. 30 WEB In Write enable signal input 31 VDD3 In +5 V source 32 CE2 In Chip enable signal input. High active. 33 AD0 In Address bus 34 CE1B In Chip enable signal input. Low active. 35 ~ 41, 43 EIO0 ~EIO7 In/Out Data bus for the effect RAM 42 , 44, 46 ~ 48, 51 ~57, 59 EA0 ~ EA12 Out Address bus for the effect RAM 45 ECEB Out Chip enable signal output for the effect RAM 49 EOEB Out Read enable signal output for the effect RAM

— 8 — AVDD 470 AG AG 1K 1K 1K C333(H) C332(H) 2SC1740SQ 1K AG AG 2SC1740SQ AVDD 47K 22K 50V0.22μ 10V22μ From the DAC To main volume Synch signal Data Word clock Bit clock Data Word clock Bit clock DSP LSI101 HG51B227FB DAC IC102 UPD6379GR CPU LSI105 UPD912GF-3BA L OUT R OUT SI LRCK CLK SO WCKO SCK1 SO LRCK BCK SINC SI WCKI BCKI DAC (IC102: UPD6379GR) 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 and output them to each channel separately. Pin No. Terminal In/Out Function 50 VSS3 In Ground (0 V) source 58 EA13 Out Not used 60 EWEB Out Write enable signal output for the effect RAM 61 EA14 Out Not used 62, 66, 70, 74, 78 VSS2 In Ground source 63, 67, 71, 75, 79 VDD2 In +5 V source 64, 65, 68, 69, 72, 73, 76, 77 PA0 ~ PA7 Out LED segment signal output FILTER BLOCK Since the sound signals from the DAC are stepped waveforms, the filter block is added to smooth the waveforms.

— 9 — LG DSP LSI101 HG51B227FB LVDD PB0 ~ PB4 IC103 BA612 LED Driver LC0 ~LC4 Q110 ~ Q117 LED Driver PA0 ~ PA7 La ~ Lg, Lp POWER AMPLIFIER (IC101: LA4598) The power amplifier is a two-channel amplifier with standby switch. The following table shows the pin function of IC101. LED DRIVING Pin No. Terminal In/Out Function 1 Power GND In Ground (0V) source 2 Ch1 B.S. — Terminal for a bootstrap capacitor 3 Ch1 OUT Out Channel 1 output 4 VCC In +9V source 5 Ch1 N.F. In Negative feedback input 6 Ch1 IN In Channel 1 input 7 D.C. — Terminal for a decoupling capacitor 8 Pre GND In Ground (0V) source 9 Stand by In Power control signal input. 0 V: Off, +9 V: On 10 Ch2 IN In Channel 2 input 11 Ch2 N.F. In Negative feedback input 12 Ch2 OUT Out Channel 2 output 13 Ch2 B.S. — Terminal for a bootstrap capacitor 14 NC — Not used

— 10 — TROUBLESHOOTING Nature of Trouble Faulty Block Cause/Remedy No power Power supply circuit Faulty Q101 ~ Q106. Replace Q101 ~ Q105. Faulty D101 ~ D105. Replace D101 ~ D105. Power jack (J101) Open J101 or poor soldering. Replace J101 or resolder. Reset IC (IC105) Faulty IC105. Replace IC105. CPU (LSI105) Faulty LSI105. Replace LSI105. Oscillator (X102) Open X102. Replace X102. No sound at all Power amp (IC101) Open or shorted IC101. Replace IC101. CPU (LSI105) Faulty LSI105. Replace LSI105. Sound source ROM (LSI104) Faulty LSI104. Replace LSI104. DSP (LSI101) Faulty LSI101. Replace LSI101. Oscillator (X101) Open X101. Replace X101. DAC (IC102) Faulty IC102. Replace IC102. Working storage RAM (LSI103) Faulty LSI103. Replace LSI103. Distorted sound Sound source ROM (LSI104) Faulty LSI104. Replace LSI104. DSP (LSI101) Faulty LSI101. Replace LSI101. Effect RAM (LSI102) Faulty LSI102. Replace LSI102. Power amp (IC101) Open or shorted IC101. Replace IC101. Certain keys do not function Key matrix Open circuit on KC, FI or SI line. Replace keyboard PCB assembly. Certain buttons do not function Button matrix Open circuit on KC, FI, SI or KI line. Replace console PCB assembly. A certain button or key does not function Key or button matrix Dust on the contact. Clean the contact.

CASIO CTK-630 ELECTRONIC KEYBOARD Repair Manual

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