CTK-431
PHONES/
OUTPUT
DC 9V
IN
OUT
MIDI
TONE
RHYTHM
SONG BANK
STATUS
TEMPO
MAIN VOLUME
MUSICAL INFORMATION SYSTEM
POWER/MODE
MAIN SYNCHRO/ START/
SONG BANK CONTROLLER
TEMPO
CHORD BOOK
VOLUME FILL-IN
STOP
M
m
7
M7
dim
TONE
SONG BANK
REW
STOP
FF
FINGERED
0
1
2
3
4
LEFT
ON/OFF
RIGHT
ON
CASIO CHORD
NORMAL
ON/OFF
OFF
5
aug
6
sus4
7
-5
8
add9
9
CLEAR
ACCOMP VOLUME
RHYTHM
TRANSPOSE/
TUNE/MIDI
P
CTK-431
ELECTRONIC KEYBOARD
INDEX
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SPECIFICATIONS
GENERAL
Keyboard:
Tones:
49 standard-size keys, 4 octaves
100
Polyphony:
Auto accompaniment
Rhythm patterns:
Tempo:
12 notes maximum (6 for certain tones)
100
Variable (236 steps, = 20 to 255)
2 fingering methods (CASIO CHORD, FINGERED)
START/STOP, SYNCHRO/FILL-IN
0 to 9 (10 steps)
Chords:
Rhythm controller:
Accomp volume:
Song bank
Tunes:
100
Controllers:
Musical dictionary
Name display:
Tempo:
PLAY/PAUSE, STOP, REW, FF, LEFT ON/OFF, RIGHT ON/OFF
TONE, RHYTHM, SONG BANK name/number, keyboard settings name/value
Tempo value, metronome, synchro standby, beat indicator
Chord name, Chord form
Chord:
Fingering:
Fingering indicators, parts, pedal (The pedal indicator is for received MIDI
data only.)
Song bank status:
Staff:
Keyboard:
PLAY, PAUSE, REW, FF
4 octaves with sharp and flat indications
4 octaves
MIDI:
5 multi-timbre receive
Other functions
Transpose:
Tuning:
12 steps (–6 semitones to +5 semitones)
Variable (A4 = approximately 440 Hz ± 50 cents)
0 to 9 (10 steps)
Volume:
Terminals
MIDI terminals:
Phones/Output terminal:
IN, OUT
Stereo standard jack (Output is monaural.)
Output Impedance: 60 Ω
Output Voltage: 5 V (RMS) MAX
9 V DC
Dual power supply system
6 AA-size batteries
Power supply terminal:
Power supply
Batteries:
Battery life:
AC adaptor:
Approximately 2 hours (SUM-3/R6P)/4 hours (AM3/LR6)
AD-5
Auto power off:
Turns power off approximately six minutes after last key operation. Can be
disabled manually.
Speaker output:
Power consumption:
Dimensions (HWD):
Weight:
3.0 W (Output is monaural.)
9 V --- 7.5 W
958 × 310 × 132 mm (37-3/4 × 12-3/16 × 5-3/16 inches)
Approximately 3.5 kg (7.7 lbs) (without batteries)
ELECTRICAL
Current drain with 9 V DC:
No sound output
200 mA ±20 %
750 mA ±20 %
Maximum volume
with 12 keys C1 to B1 pressed in Synth-Lead 1
Volume: 9 (Max.)
Phone output level (Vrms with 8 Ω load each channel):
with key A4 pressed in Synth-Lead 1
95 mV ±20 %
Speaker output level (Vrms with 4 Ω load each channel):
with key C4 pressed in Synth-Lead 1
1050 mV ±20 %
Output level (Vrms with 47 KΩ load each channel):
with key C1 pressed in Synth-Lead 1
1100 mV ±20 %
Minimum operating voltage:
5.7 V
— 1 —
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BLOCK DIAGRAM
COM1 ~ COM16
LCD Driver
KS0066U-10B
LSI3
LCD
Buttons
Keyboard
SEG1 ~ SEG40
RS
R/W
E
KO8 ~
KO12
KI0 ~ KI6
DB4 ~ DB7
Phones/Output
Speaker
(L)
Power Amp.
LA4598
KO0 ~ KO7
IC101
Speaker
(R)
Filter
Q105
CPU
MSM 6755C-17
LSI1
MD0 ~ MD7
VC
VCC DVDD AVDD
APO
ROM(2M-bit)
UM23C2101M
7384/Q
DC + 9 V IN
MA0 ~ MA17
Power Supply Circuit
Q101 ~ Q103, D104
LSI2
Power Switch
Reset IC
IC1
Oscillator
X1, Q1
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CIRCUIT DESCRIPTION
KEY MATRIX
KI0
KI1
G#2
A2
KI2
E3
KI3
C4
KI4
G#4
A4
KI5
E5
KI6
KO0
KO1
KO2
KO3
KO4
KO5
KO6
KO7
KO8
C2
C#2
D2
C6
F3
C#4
D4
F5
A#2
B2
F#3
G3
G#3
A3
A#4
B4
F#5
G5
D#2
E2
D#4
E4
C3
C5
G#5
A5
F2
C#3
D3
F4
C#5
D5
F#2
G2
—
A#3
B3
F#4
G4
A#5
B5
D#3
+
D#5
Tempo
Down
Tempo
Up
Volume
Down
Volume
Up
0
Start/
Stop
Synchro/
Fill-in
Chord
Book
Accomp
Volume
KO9
KO10
KO11
KO12
3
6
2
5
1
4
Transpose/
Tune
Song
Bank
Rhythm
Normal
Rewind
Tone
7
9
8
Fingered
Stop
CASIO
Left
Power Off
Chord
Play/
Pause
FF
Right
NOMENCLATURE OF KEYS
C#2 D#2
F#2 G#2 A#2
C#3 D#3
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
C2 D2 E2
F2
G2 A2 B2
C3 D3 E3 F3
G3
A3 B3 C4
D4 E4 F4 G4
A4
B4 C5 D5
E5 F5 G5 A5
B5
C6
— 3 —
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CPU (LSI1: MSM6755C-17)
The CPU reads sound data from the ROM in accordance with the pressed key and the selected tone; the CPU
can read rhythm data simultaneously when a rhythm pattern is selected. Then it provides the left and the right
channels’ waveforms separately, by converting the data into the waveforms with two built-in DACs. The CPU
also controls key and button input. The following table shows the pin functions of LSI1.
Pin No.
1
Terminal
MA14
In/Out
Out
—
Function
Address bus
Not used
2, 3
4 ~ 19
13
NCO
MA0 ~ MA13
MRDB
Out
Out
—
Address bus
Read enable signal
Not used
17
MCSB
20 ~ 27
28, 29
30
MD0 ~ MD7
NC1, NC2
DGND
In/Out
—
Data bus
Not used
In
Ground (0 V) source
+5 V source
31
DVCC
In
32, 33
34
XTLO, XTLI
NC3
In/Out
—
20 MHz clock input/output
Not used
35
RSTB
In
Reset signal input
36
P24/RXD
P25/TXD
NMI
—
MIDI signal input
37
—
MIDI signal output
38
In
Power ON signal input. Connected to +5 V.
APO (Auto Power Off) signal output
Not used
39
APO
Out
—
40
NC4
41
REFH
Out
—
Terminal for the internal DAC
Not used
42, 43
44
NC5, NC6
DAOR
Out
—
Sound waveform signal output
Not used
45
NC7
46
AVdac
In
+5 V source for the internal DAC
Left channel sound waveform output
Terminal for the internal DAC and ADC
Ground source for internal DAC
Ground source for internal ADC
Not used
47
DAOL
Out
Out
In
48
REFL
49
AGdac
50
AGadc
In
51
ANI
In
52
AVadc
In
+5 V source for the internal ADC
Not used
53
NC8
—
54
MOD0
In
Mode selection terminal. Connected to +5 V.
Mode selection terminal. Connected to ground.
Not used
55, 56
57
MOD1, MOD2
P40
In
—
58 ~ 64
65
KI0/P30 ~ KI7/P36
KI7/P37
KO0/P50 ~ KO7/P57
In
Terminals for key/button input signal
Not used
—
66 ~ 73
Out
Terminals for key scan signal
— 4 —
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Pin No.
74 ~ 77
78
Terminal
DB4 ~ DB7
NC9
In/Out
Out
—
Function
Data bus for the LCD driver
Not used
79
LVCC
In
+5 V source
80 ~ 84
85 ~ 87
88
KO8 ~ KO12
P65 ~ P67
RS
Out
—
Terminals for button scan signal
Not used
Out
Out
Out
—
Control signal for the LCD driver
Read/Write signal for the LCD driver
Chip enable signal for the LCD driver
Not used
89
R/W
90
E
91 ~ 95
96
P73 ~ P77
LGND
In
Ground source
97, 100
MA18, MA15
Out
Address bus
LCD DRIVER (LSI3: KS0066U-10B)
The LCD driver can drive a dot matrix LCD having 40 segment and 16 common lines. The LSI contains 240
graphic symbols in the built-in character generator ROM, and stores 80 characters in the built-in display data
RAM. In accordance with command from the CPU, the LSI is capable of displaying up to 16 characters
simultaneously. The following table shows the pin functions of LSI3.
Pin No.
Terminal
In/Out
Function
1 ~ 22,
63 ~ 80
23
SEG1 ~ SEG40
Out
Segment signal output
VSS
—
GND (0 V) source
Terminals for the built-in clock pulse generator. The
In/Out external resistor connected determines the oscillation
frequency.
24, 25
OSC1, OSC2
LCD drive voltage input.
Those voltages are used for generating the stepped
pulse of the LCD drive signals.
26 ~ 30
V1 ~ V5
In
31, 32
33
LP, XCLS
VDD
—
In
Not used
DVDD (+5 V) source
Not used
34, 35
FR, DO
—
Data/command determination terminal.
High: data, Low: command
36
37
RS
In
In
R/W
Read/Write terminal. High: read, Low: write
Chip enable signal.
High: enable, the writing is done at fall edge.
Low: disenable
38
E
In
39 ~ 42
43 ~ 46
47 ~ 62
DB0 ~ DB3
DB4 ~ DB7
—
Not used. Connected to GND (0 V)
In/Out Data bus
Out Common signal/output
COM1 ~ COM16
— 5 —
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FILTER BLOCK
Since the sound signals from the CPU is stepped waveforms, the filter block is added to smooth the waveforms.
Amp.
CPU
Filter
LA4598
MSM6755C-17
Block
POWER AMPLIFIER (IC101: LA4598)
The power amplifier is a two-channel amplifier with standby switch.
The following table shows the pin function of IC101.
Pin No.
Terminal
Power GND
Ch1 B.S.
Ch1 OUT
VCC
In/Out
In
Function
1
2
Ground (0 V) source
—
Terminal for a bootstrap capacitor
Channel 1 output
3
Out
In
4
+9 V source
5
Ch1 N.F.
Ch1 IN
In
Negative feedback input
Channel 1 output
6
In
7
D.C
—
Terminal for a bootstrap capacitor
Ground (0 V) source
8
Pre GND
Stand by
Ch2 IN
In
9
In
Power control signal input. 0 V:Off, +9 V: On
Not used. Connected to ground (0 V)
Negative feedback input
10
11
12
13
14
In
Ch2 N.F.
Ch2 OUT
Ch2 B.S.
NC
In
Out
—
Channel 2 output
Terminal for a bootstrap capacitor
Not used
—
— 6 —
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ADJUSTMENT
MAIN PCB
1) Items to be adjusted:
Item
Measuring Instrument
Vop voltage setting
Voltmeter
2) Adjustment and Test Point Locations
(TOP VIEW)
(BOTTOM VIEW)
VR1
TP1
3) Equipment connection/Procedure
Vop voltage setting
Set
Voltmeter
Output
TP1
Input
Connection
Input
Point
Input
Signal
Output
Connection Point
Voltmeter TP1
Output
Adjust for
Adjust
Adjust for 4.1 ~ 4.0 V reading
on voltmeter under the
temparature 20 ~ 25 °C.
Make fine adjustment ac-
cording to the following in-
struction.
VR1
Eye
Watching the LCD at a 36.6° angle to the horizontal, adjust Vop
voltage so that unenergized segments are seen dimly.
36.6°
LCD
— 7 —
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MAJOR WAVEFORMS
1
2
3
1 Clock pulse
2 +5 V source DVDD
JB connector pin 4
3 APO signal
JB connector pin 8
MSM6755C-17 pin 32
4
6
7
5
6 LCD common signal COM9
KS0066U-10B pin 55
4 Button scan signal KO6
JA connector pin 14
7 LCD common signal COM10
KS0066U-10B pin 56
5 Button scan signal KO7
JA connector pin 15
— 8 —
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PRINTED CIRCUIT BOARDS
Main PCB JCM444-MA1M
1
2
3
4
5
6
7
Top View
Bottom View
— 9 —
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SCHEMATIC DIAGRAMS
Main PCB JCM444-MA1M
2
3
4
5
6
7
1
— 10 —
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Sub PCBs JCM444-MA2M/MA3M
— 11 —
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Keyboard PCBs JCM4911K-KY1M/KY2M
— 12 —
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LCD
Common
Segment
— 13 —
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EXPLODED VIEW
22
R-1
5
8
6
9
16
18
10
7
17
12
11
15
14
13
1
19
2
R-2
23
4
R-3
20
4
21
R-4
R-5
3
— 14 —
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PARTS LIST
CTK-431
Notes: This parts list does not include the cosmetic parts, which
parts are marked with item No. "R-X" in the exploded
view.
Contact our spare parts department if you need these
parts for refurbish.
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
seperately.
3. The numbers in item column correspond to the same
numbers in drawing.
— 15 —
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Item
Code No.
Main PCB
Part Name
Specification
Q
R
1
LSI1
LSI2
LSI3
IC1
Q1,Q2
Q3
VR1
X1
6926 7070 PCB/ASSY (MA1M)
2012 5603 LSI/MC (CPU)
2012 5611 LSI/MASK-ROM
2012 5935 LSI/LCD DRIVER
2012 1883 IC/MOS (RESET IC)
2252 1239 TRANSISTOR
M240832*1
MSM6755B-17
UM23C2101M-7384/Q
KS0066U-10B
RN5VD40AA-TR
2SC4081T106Q
2SA1576AT106R
EVN-D8AA03B53
CSACS20.00MX040-TC
1
1
1
1
2
1
1
1
1
B
A
A
A
B
B
B
B
B
2250 1162 TRANSISTOR
2775 0994 POTENTIOMETER
2590 2100 OSCILLATOR/CERAMIC
Sub PCB
2
6927 5070 PCB/ASSY (MA2,3M)
2114 2891 IC/LINEAR (POWER AMP)
2252 1248 IC/POTOCUPPLER
2250 1591 TRANSISTOR
M241005*1
LA4598
1
1
1
1
3
1
1
1
B
A
A
A
A
A
C
C
IC101
IC102
Q102
HCPL-261A
2SB1237TV2R
2SC1740STPR
2SD1858TV2R
SRT14
Q103~Q105 2250 1592 TRANSISTOR
Q101
D101
D102
2250 1593 TRANSISTOR
2390 3021 DIODE/SHOTTKY
2390 3018 DIODE
1T2
D104~D113
D103
2390 1344 DIODE
1SS133T-77-T
MTZJ6.2A-T77-T
YKB21-5006
HEC2305-01-330
YKF51-5051
10 C
2360 2044 DIODE/ZENER
3612 0665 JACK (PHONE)
3501 7049 JACK (POWER)
3501 4816 JACK (MIDI)
Keyboard PCBs
1
1
1
1
A
B
B
B
J101
J102
J103
3
6926 7050 PCB/ASSY
M140749*1
1
C
D701 - D749 2301 0101 DIODE
1S2473T-77-T
49 B
Mechanical Parts
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
3831 0665 SPEAKER
3335 6823 LCD
6926 7200 RUBBER/INTERCONNECTOR
6927 6040 SPACER/455A
6927 6050 SPACER/455B
6927 6060 FILM/LEXAN
6927 5060 EL
6909 5890 SWITCH/SLIDE KONB
6921 5031 KNOB
6927 6070 RUBBER/BUTTON
6927 6080 RUBBER/BUTTON
6927 6090 RUBBER/BUTTON
6927 6100 RUBBER/BUTTON
6922 2720 KEY SET/LT WHITE
6922 2730 KEY SET/LT WHITE
6922 2740 KEY SET/LT BLACK 10P
6926 0670 RUBBER/CONTACT
6926 0680 RUBBER/CONTACT
6906 9611 PANEL/DISPLAY
6925 4500 COVER/BATTERY
Accessory
10G42AFA
LD-B10272E
M440584-2
M440810-1
M440811-1
M440812-1
M340996*1
CSB-12D
M311859-1
M240796-2
M240797-2
M240798-2
M240799-2
M312118*1
M312118*2
M111726-1
M240549-1
M240550-1
M340789-2
M340528*1
1
1
2
1
1
1
1
1
1
1
1
1
1
3
1
2
3
1
1
1
B
B
C
C
C
C
B
B
B
B
B
B
B
A
A
A
A
A
C
B
6906 8752 STAND/NOTE
M340629B*2
1
B
Notes: Q – Quantity per unit
R – Rank
— 16 —
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CASIO TECHNO CO.,LTD.
Overseas Service Division
Nishi-Shinjuku Kimuraya Bldg. 1F
5-25, Nishi-Shinjuku 7-Chome
Shinjuku-ku, Tokyo 160-0023, Japan
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