Casio Electronic Keyboard casio electronic keyboard User Manual

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 load each channel):  
with key A4 pressed in Synth-Lead 1  
95 mV ±20 %  
Speaker output level (Vrms with 4 load each channel):  
with key C4 pressed in Synth-Lead 1  
1050 mV ±20 %  
Output level (Vrms with 47 Kload 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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