Casio Electronic Keyboard CTK 401 User Manual

CTK-401  
100 RHYTHMS  
100 TONES  
TONE  
RHYTHM  
SONG BANK  
STATUS  
TEMPO  
VOLUME  
100 SONG BANK (00-49)  
100 SONG BANK (50-99)  
POWER/MODE  
MUSICAL INFORMATION SYSTEM  
CHORD BOOK  
REW  
STOP  
FF  
MAIN SYNCHRO/ START/  
VOLUME FILL-IN STOP TEMPO  
M
m
7
M7  
3
dim  
4
TONE  
SONG BANK  
FINGERED  
LEFT  
ON/OFF  
RIGHT  
0
1
2
ON/OFF  
CASIO  
CHORD  
ON  
OFF  
5
6
7
8
9
NORMAL  
PLAY/  
PAUSE  
C
aug  
sus4  
-5  
add9 CLEAR  
RHYTHM  
TRANSPOSE/  
TUNE  
ACCOMP VOLUME  
100 SONG BANK KEYBOARD  
MUSICAL INFORMATION SYSTEM  
SONG BANK CONTROLLER  
CTK-401  
ELECTRONIC KEYBOARD  
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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  
Tempo value, metronome, synchro standby, beat indicator  
Chord name, Chord form  
Chord:  
Fingering:  
Fingering indcators, parts  
Song bank status:  
Staff:  
Keyboard:  
PLAY, PAUSE, REW, FF, playing  
Four octaves with sharp and flat indications  
Four octaves  
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  
Phones/Output terminal:  
Stereo standard jack  
Output Impedance: 100 Ω  
Output Voltage: 3.0 V (RMS) MAX  
9 V DC  
Dual power supply system  
Power supply terminal:  
Power supply  
Batteries:  
Six AA-size batteries  
Battery life:  
AC adaptor:  
Approximately 2 hours (SUM-3/R6P)/6 hours (AM3/LR6)  
AD-5  
Auto power off:  
Turns power off approximately six minutes after last key operation. Enabled  
under battery power only, can be disabled manually.  
2.0 W + 2.0 W  
Speaker output:  
Power consumption:  
Dimensions (HWD):  
Weight:  
9 V --- 7.0 W  
988 × 332 × 124 mm (38-15/16 × 13-1/16 × 4-7/8 inches)  
Approximately 3.5 kg (7.7 lbs) (without batteries)  
ELECTRICAL  
Current drain with 9 V DC:  
No sound output  
Maximum volume  
100 mA ± 20 %  
625 mA ± 20 %  
with 12 keys C4 to B4 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  
Speaker output level (Vrms with 4 load each channel):  
with key A4 pressed in Synth-Lead 1  
67 mV ± 20 %  
900 mV ± 20 %  
5.7 V  
Minimum operating voltage:  
— 1 —  
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BLOCK DIAGRAM  
COM1 ~ COM16  
LCD Driver  
SED1278F0A  
LSI3  
LCD  
Buttons  
Keyboard  
SEG1 ~ SEG40  
RS  
R/W  
E
KO8 ~  
KO12  
KI0 ~ KI6  
DB4 ~ DB7  
Output  
Filter (L)  
Q104  
Power Amp.  
TA8248K  
IC101  
KO0 ~ KO7  
Filter (R)  
Q105  
CPU  
MSM 6755B-17  
LSI1  
MD0 ~ MD7  
VC  
VCC DVDD  
APO  
ROM(2M-bit)  
UM23C2101M  
7384/Q  
DC + 9 V IN  
MA0 ~ MA17  
Power Supply Circuit  
Q101 ~ Q103, D104  
LSI2  
Reset IC  
IC1  
Oscillator  
X1, Q1  
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CIRCUIT DESCRIPTION  
KEY MATRIX  
KI0  
KI1  
G#2  
A2  
KI2  
E3  
F3  
F#3  
G3  
G#3  
A3  
A#3  
B3  
0
KI3  
C4  
KI4  
G#4  
A4  
KI5  
E5  
KI6  
KO0  
KO1  
KO2  
KO3  
KO4  
KO5  
KO6  
KO7  
KO8  
KO9  
KO10  
KO11  
KO12  
C2  
C#2  
D2  
D#2  
E2  
F2  
F#2  
G2  
C6  
C#4  
D4  
F5  
A#2  
B2  
A#4  
B4  
F#5  
G5  
D#4  
E4  
C3  
C#3  
D3  
D#3  
+
C5  
G#5  
A5  
F4  
C#5  
D5  
F#4  
G4  
A#5  
B5  
D#5  
Tempo  
Down  
Tempo  
Up  
Volume  
Down  
Volume  
Up  
Start/  
Stop  
Synchro/  
Fill-in  
Chord  
Book  
Accomp  
Volume  
3
2
1
Transpose/  
Tune  
Song  
Bank  
6
5
4
Rhythm  
Normal  
Rewind  
Tone  
CASIO  
Chord  
9
8
7
Fingered  
Stop  
Power Off  
Play/  
Pause  
FF  
Right  
Left  
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: MSM6755B-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.  
Terminal  
In/Out  
Function  
1
MA14  
Out  
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  
Not used. Connected to +5 V.  
Not used  
37  
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  
Right channel sound waveform 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  
APO cancellation signal  
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.  
Terminal  
In/Out  
Function  
Data bus for the LCD driver  
74 ~ 77  
DB4 ~ DB7  
Out  
78  
79  
NC9  
LVCC  
In  
Not used  
+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: SED1278F0A)  
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.  
1 ~ 22,  
63 ~ 80  
Terminal  
In/Out  
Function  
SEG1 ~ SEG40  
VSS  
Out  
Segment signal output  
GND (0 V) source  
23  
Terminals for the built-in clock pulse generator. The external  
resistor connected determines the oscillation frequency.  
LCD drive voltage input.  
24, 25  
OSC1, OSC2  
In/Out  
26 ~ 30  
V1 ~ V5  
In  
Those voltages are used for generating the stepped pulse of  
the LCD drive signals.  
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.  
38  
E
In  
High: enable, the writing is done at fall edge.  
Low: disenable  
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  
TA8248K  
MSM6755B-17  
Block  
POWER AMPLIFIER (IC101: TA8248K)  
The power amplifier is a two-channel amplifier with standby switch.  
The following table shows the pin function of IC101.  
Pin No.  
Terminal  
NC  
In/Out  
Function  
1
2
Not used  
B.S.2  
OUT2  
VCC  
Terminal for a bootstrap capacitor  
Channel 2 output  
3
Out  
In  
4
+9 V source  
5
OUT1  
B.S.1  
Power GND  
Stand by  
DC  
Out  
Channel 1 output  
6
Terminal for a bootstrap capacitor  
Ground (0 V) source  
7
In  
8
In  
Power control signal input. 0 V: Off, +9 V: On  
Terminal for a decoupling capacitor  
Negative feedback input  
Channel 1 input  
9
10  
11  
12  
13  
14, 15  
NF1  
In  
IN1  
In  
IN2  
In  
Channel 2 input  
NF2  
In  
Negative feedback input  
Ground (0 V) source  
Pre GND  
In  
— 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)  
Test point  
3) Equipment connection/Procedure  
Vop voltage setting  
Set  
Voltmeter  
Output  
V5  
Input  
Connection  
Input  
Point  
Input  
Signal  
Output  
Connection Point  
Voltmeter V5  
Output  
Adjust for  
Adjust  
VR1  
Adjust for 4.3 ±0.1 V reading  
on voltmeter.  
Make fine adjustment accord-  
ing to the next instruction.  
Eye  
Watching the LCD at a 53.5° angle to the horizontal, adjust Vop  
voltage so that unenergized segments are seen dimly.  
53.5°  
LCD  
— 7 —  
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MAJOR WAVEFORMS  
1
2
3
1 Clock pulse  
MSM6755B-17 pin 32  
2 +5 V source DVDD  
JC connector pin 6  
3 APO signal  
JC connector pin 5  
6
7
4
5
6 Button scan signal KO6  
JA connector pin 14  
4 Sound waveform (R-ch) Tone: Whistle  
JC connector pin 4 Key: A4  
7 Button scan signal KO7  
JA connector pin 15  
5 Sound waveform (L-ch) Volume:  
JC connector pin 3  
8
9
8 LCD common signal COM9  
SED1278F0A pin 55  
9 LCD common signal COM10  
SED1278F0A pin 56  
— 8 —  
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PRINTED CIRCUIT BOARDS  
Main PCB JCM442-MA1M  
1
5
4
3
2
6
7
Top View  
8
9
Bottom View  
— 9 —  
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SCHEMATIC DIAGRAMS  
Main PCB JCM442-MA1M  
2
3
4
5
6
7
1
9
8
— 11 —  
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Sub PCB JCM442-MA2M  
— 12 —  
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Keyboard PCBs KDM4910K-KY1M/KY2M  
— 13 —  
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LCD  
Common  
Segment  
— 14 —  
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EXPLODED VIEW  
18  
R-1  
5
12  
14  
6
13  
11  
8
7
10  
9
1
15  
2
R-2  
19  
4
R-3  
16  
4
R-6  
17  
R-4  
R-5  
3
— 15 —  
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PARTS LIST  
CTK-401  
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.  
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Item  
Code No.  
Main PCB  
Parts Name  
Specification  
Q
R
1
6926 0200 PCB/ASS'Y (MA1M)  
2012 5603 LSI/MC (CPU)  
2012 5611 LSI/MASK-ROM  
2012 5569 LSI/LCD DRIVER  
2012 1883 IC/MOS (RESET IC)  
2252 1239 TRANSISTOR  
2775 3286 POTENTIOMETER  
2590 2100 OSCILLATOR/CERAMIC  
Sub PCB  
M240592*1  
MSM6755B-17  
UM23C2101M-7384/Q  
SED1278F0A  
RN5VD40AA-TR  
2SC4081T106Q  
1 B  
1 A  
1 A  
1 A  
1 B  
1 B  
1 B  
1 B  
LSI1  
LSI2  
LSI3  
IC1  
Q1  
VR1  
X1  
EVM3SSX50B53  
CSACS20.00MX040-TC  
2
6926 0190 PCB/ASS'Y (MA2, 3M)  
2114 5775 IC/LINEAR (POWER AMP.)  
2250 0168 TRANSISTOR  
M140548*1  
TA8248K  
1 B  
1 A  
1 A  
3 A  
1 A  
1 C  
1 C  
11 C  
1 A  
1 A  
1 C  
1 B  
1 B  
IC101  
Q101  
2SA854SR-TP-T  
2SC1740SR-TP-T  
2SD1858TV2Q  
RB100A-T32-T  
1T2  
1SS133T-77-T  
MTZJ6.2A-T77-T  
MTZJ5.1A-T77-T  
LN28RPX-(TT8)  
HEC2305-01-330  
YKB21-5006  
Q102, Q104/105 2220 1409 TRANSISTOR  
Q103  
D101  
D102  
D103  
D104  
D105  
LED101  
J101  
2250 1585  
TRANSISTOR  
2390 1323 DIODE/SHOTTKY  
2390 3018 DIODE  
2390 1344 DIODE  
2360 2044 DIODE/ZENER  
2360 1799 DIODE/ZENER  
2370 0112 LED  
3501 7049 JACK (POWER)  
3612 0665 JACK (PHONE)  
Keyboard PCBs  
J102  
3
6926 0180 PCB/ASS'Y  
M140449*3  
1 C  
D701 - D749  
2301 0101 DIODE  
1S2473T-77-T  
49 B  
Mechanical Parts  
B
4
5
6
7
8
3831 0770 SPEAKER  
3335 6556 LCD  
6926 0270 RUBBER/INTERCONNECTOR  
6909 5890 SWITCH/SLIDE KONB  
6921 5031 KNOB  
6926 0280 RUBBER/BUTTON  
6926 0290 RUBBER/BUTTON  
6926 0300 RUBBER/BUTTON  
6926 0310 RUBBER/BUTTON  
6922 2720 KEY SET/LT WHITE  
6922 2730 KEY SET/LT WHITE  
6922 2740 KEY SET/LT BLACK 10P  
6922 4000 RUBBER/CONTACT  
6923 2390 RUBBER/CONTACT  
6926 0320 PANEL/DISPLAY  
6926 0020 COVER/BATTERY  
Accessory  
S10JA13A  
LD-B10023A  
M440435-2  
CSB-12D  
1
1 B  
2 C  
1 B  
M311859-1  
M240587-1  
M240588-1  
M240589-1  
M240590-1  
M312118*1  
M312118*2  
M111726-1  
M111765-1  
M240025-1  
M340608-1  
M340528*2  
1
B
9
1 B  
1 B  
1 B  
1 B  
A
1 A  
A
1 A  
1 A  
C
1 B  
10  
11  
12  
13  
14  
15  
16  
17  
18  
19  
3
2
1
6906 8752 STAND/NOTE  
M340629B*2  
1
B
Notes: Q – Quantity per unit  
R – Rank  
— 17 —  
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MA0600571A  
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