Casio CTK-530 User manual

ELECTRONIC KEYBOARD

CTK-530

(with price)

— 2 —

CONTENTS

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Circuit Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Major waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

PCB View and Check Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Schematic Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

SPECIFICATIONS

GENERAL

Number of keys: 61

Polyphonic: 24-note

Preset tones: 64

Keyboard controls: Touch response: On/Off,

Key transpose: Range from F# to F by a semitone increment

Auto-rhythms: 64, Tempo control: 40 to 255

Auto-accompaniment: Mode: CASIO Chord/Fingered/Full-Range Chord 1/Full-Range Chord 2

Controller: Fill-In, Synchro/Ending

Digital volume controls: Main volume: 10 steps

Accompaniment volume: 100 steps

Demo tunes: 3, A Night has 9000 Bars (arranged and programmed byThomas Hirsch)

Wanting This (Edward Alstrom)

Supersonic Remorse (Edward Alstrom)

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: 50 Ω, Output voltage: 4.0 V(rms) MAX],

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 AD-5

DC: 6 D size dry batteries

Battery life: approx. 5 hours by manganese batteries R20P/SUM-1

Power consumption: 7.7 W

Dimensions (HWD): 99 x 931 x 326 mm (3-7/8 x 36-5/8 x 12-13/16 inches)

Weight: 4.4 kg (9.7 lbs) excluding batteries

ELECTRICAL

Current Drain with 9 V DC:

No Sound Output 180 mA ±20%

Maximum Volume 825 mA ±20%

with keys C3 to E4 pressed in Synth-Lead 1 tone

Volume: maximum, Touch response: maximum

— 3 —

Headphone output level (Vrms with 8 Ωload each channel):

with key C3 pressed in Pan Flute tone 210 mV ±20%

Output level (Vrms with 47 kΩload each channel):

with key C2 pressed in Pan Flute tone 2000 mV ±20%

Speaker output level (Vrms with 4 Ωload each channel):

with key A1 pressed in Pan Flute tone 2150 mV ±20%

Minimum operating voltage: 6.3 V

BLOCK DIAGRAM

KC0 ~ KC7

FI0 ~ FI7

SI0 ~ SI7

Sound Source ROM

(8M-bit)

LSI102

MX23C8100MC-

12CA19

LRCK, SO, BCK

D/A Converter

IC103

UPD6379GR

Filter

Q108, Q109

Power Amplifier

IC101

LA4598

LED driver

IC106

BA612

Keyboard

MA0 ~ MA19

Power Supply Circuit

Q101 ~ Q105, Q110, Q119

D104, D105, D109

VCC AVDD VDD

LVDD DVDD

APO

MD0

MD7

Speakers

Output

MA8

MA11

LEDs /

7Seg. LED

LED driver

Q111 ~ Q118 La ~ Lg, Lp

MIDI IN

OUT

Buttons VDD

Power Switch

Reset IC

IC104

RE5VA35AA

RESET FI10

CPU

LSI101

UPD912GF-3BA

KI0

~ KI2

MD0 ~ MD15

LED Latch

IC105

HD74HC75P

LED Latch

IC107

HD74HC373P

NMI

— 4 —

Key

Second contact (2) First contact (1) FI

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)

FI10 +-0

Accomp.

Volume Up

Main Vol.

Up Mode

KI0 Demo 3 2 1 Tempo

Up Main Vol.

Down Intro/

Fill-In

KI1

Transpose

Tune/MIDI

6 5 4 Rhythm

Accomp.

Vol. Down

Synchro/

Ending

KI2

Touch

Response

9 8 7 Tone Tempo

Down Start/

Stop

CIRCUIT DESCRIPTION

KEY MATRIX

Note: Each key has two contacts, the first conatct (1) and second contact (2).

— 5 —

CPU

LSI101

UPD912GF-3BA

Sound Source ROM

LSI102

MX23C8100PC-12CA19

CE A0 ~ A18 D0 ~ D15

MA1 ~

MA19 MD0 ~

MD15

MSB0

FI0 ~ FI7

SI0 ~ SI7 SO

BOK

LRCK

X101

20 MHz

DAC

IC103

UPD6379GR

LOUT

ROUT

SO: Sound data

BOK: Bit clock

LRCK: Word clock

CLK

LRCK

From keyboard

Reset IC

IC104

RE5VA35AA Power Supply Circuit

VDD Battery set

RESET

VDD

POWER From power switchNMI

APO

CPU

LSI101

UPD912GF-3BA

SCKO

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.

Whenthepowerswitchispressed,theCPUreceivesalowpulseofPOWERsignal.TheCPUraisesAPOsignal

to +5 V to turn power on.

CPU (LSI101: 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 DAC.The CPU also controls MIDI input/output and LED driving.

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 B6A6G6F6E6D6 C7

C#3A#2G#2

F#2D#2

C#2 A#6

G#6F#6D#6

C#6

— 6 —

The following table shows the pin functions of LSI101.

DAC (IC103: UPD6379GR)

The DAC receives 16-bit serial data output from the CPU. 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

1 TXD0 Out MIDI signal input

2 RXD0 In MIDI signal output

3 SCK0 Out APO (Auto Power Off) signal output

4 ~ 6 Not used. Connected to ground.

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. Connected to ground.

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 Key input signal

31 ~ 38 KC0 ~ KC7 Out Key scan signal output

39 ~ 46 FI4 ~ FI7

SI4 ~ SI7 In Key input signal

47 ~ 50 In Not used.

51 FI10 In Button input signal input

52 SI10 In Not used

53 ~ 55 KI0 ~ KI2 In Button input signal input

56 MWNB Out Not used.

57 ~ 76 MA1 ~ MA17 Out Address bus

77 MCSB0 Out Chip enable signal output for the sound source ROM

78, 79 Out Not used

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 Latch enable signal output for LED latches

100 P17 In APO cancellation signal input

— 7 —

Filter Block From DAC

To power amplifier

Name Voltage For operation of

VDD +5 V CPU, Reset IC, Sound source ROM, LED Latches

DVDD +5 V Power jack, Photocoupler

AVDD +5V DAC, Filter

LVDD +5 V LED Drivers

VCC +9 V Power amplifier, Pilot lamp

VC +9 V Power amplifier

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

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.

FILTER BLOCK

Since the sound signals from the DAC are stepped waveforms, the filter block is added to smooth the

waveforms.

POWER AMPLIFIER (IC102: LA4598)

The power amplifier is a two-channel amplifier with standby switch.

The following table shows the pin function of IC102.

— 8 —

LED Latch

IC107

HD74HC373AP

CPU

LSI101

UPD912GF-3BA

LVDD

LED Latch

IC105

HD74HC75AP

PLE

IC106

BA612

LED Driver

LO0 ~LO3

Q111 ~Q118

LED Driver

MD0 ~ MD7

La ~ Lg, Lp

MD8 ~ MD11

LED DRIVING

— 9 —

CH1

CH2

CH3

A 5 ms

CH1

CH2

CH3

CH1: 5 V CH2: 5 V CH3: 5 V

–––

A 1 ms

CH1

CH2

CH1: 0.2 V CH2: 0.2 V

A 1 ms

CH1

CH2

CH1: 0.2 V CH2: 0.2 V

CH1

CH2

CH3

–––

CH1: 5 V CH2: 5 V CH3: 5 V

A 2 µs

0.1 s

CH1: CH2: 5 V5 V CH3: 5 V

50 µs

CH1

CH2

CH3

CH1: CH2: 5 V5 V CH3: 5 V

MAJOR WAVEFORMS

1POWER ON signal

UPD912GF-3BA pin 21

2APO signal

UPD912GF-3BA pin 3

3Reset signal for the DSP

UPD912G-3BA pin 99

4Key scan signal KC0

UPD912GF-3BA pin 31

5Key scan signal KC1

UPD912GF-3BA pin 32

6Key scan signal KC2

UPD912GF-3BA pin 33

CDAC output (R-ch)

UPD6379GR pin 5

DDAC output (L-ch)

UPD6379GR pin 8

EAmp. input (R-ch)

LA4598 pin 6

FAmp. input (L-ch)

LA4598 pin 10

7LED drive signal

BA612 pin 13

8LED drive signal

BA612 pin 12

9LED drive signal

BA612 pin 11

0Word clock LRCK

UPD912GF-3BA pin 13

AData signal SO

UPD912GF-3BA pin 12

BBit clock BCK

UPD912GF-3BA pin 11

Tone: Pan Flute (39)

Key: A4

Touch response: Off

Volume: Maximum

— 10 —

PCB VIEW AND CHECK POINTS

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