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ELECTRONIC KEYBOARD
CTK-530
(with price)


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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
, 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


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Headphone output level (Vrms with 8
load each channel):
with key C3 pressed in Pan Flute tone
210 mV
± 20%
Output level (Vrms with 47 k
load each channel):
with key C2 pressed in Pan Flute tone
2000 mV
± 20%
Speaker output level (Vrms with 4
load 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
VC
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


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Key
Second contact (2)
First contact (1)
FI
KC
SI
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).


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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
PG
X101
20 MHz
DAC
IC103
UPD6379GR
LOUT
ROUT
SO: Sound data
BOK: Bit clock
LRCK: Word clock
SI
CLK
LRCK
From keyboard
Reset IC
IC104
RE5VA35AA
Power Supply Circuit
VDD
Battery set
RESET
VDD
POWER
From power switch
NMI
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.
When the power switch is pressed, the CPU receives a low pulse of POWER signal.The CPU raises APO signal
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
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