CTK-501
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100 TONES
100 SONG BANNK
100 RHYTHMS
POWER/MODE
MAIN VOLUME
TEMPO
CHORD BOOK
SONG BANK CONTROLLER
TONE
MUSICAL INFORMATION SYSTEM
M
7
m
8
7
9
M7
4
dim
5
aug
6
STOP
FINGERING/PART
TRANSPOSE/
TUNE/MIDI
100 SONG BANNK KEYBOARD
MUSICAL INFORMATION SYSTEM
SONG BANK CONTROLLER
ON
FINGERED
CASIO CHORD
NORMAL
TONE
RHYTHM
SONG BANK
STATUS
TEMPO
MAIN VOLUME
OFF
ACCOMP
VOLUME
RHYTHM
LEFT/
ACCOMP
RIGHT/
MELODY
REW
:1 OCTAVE UP
sus4
:PEDAL(SUSTAIN)
START/
STOP
1
-5
2
add9
FF
3
PLAY/
PAUSE
SONG BANK
CLEAR
SYNCHRO/
FILL-IN
0
LEFT
RIGHT
ON/OFF
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CTK-501
ELECTRONIC KEYBOARD
CONTENTS
Specifications ................................................................................................................................... 1
Block Diagram .................................................................................................................................. 2
Circuit Description ............................................................................................................................ 3
Adjustment ....................................................................................................................................... 7
Major Waveforms ............................................................................................................................. 8
Printed Circuit Boards ...................................................................................................................... 9
Schematic Diagrams ...................................................................................................................... 11
Exploded View ............................................................................................................................... 16
Parts List ........................................................................................................................................ 17
SPECIFICATIONS
GENERAL
Keyboard:
Tones:
Polyphony:
Auto accompaniment
Rhythm patterns:
Tempo:
Chords:
Rhythm controller:
Accomp volume:
Song bank
Tunes:
Controllers:
Musical information
Name display:
Tempo:
Chord:
Fingering:
Song bank status:
Staff:
Keyboard:
MIDI:
Other functions
Transpose:
Tuning:
Volume:
Terminals
MIDI terminals:
Sustain terminal:
Phones/Output terminal:
Power supply terminal:
Power supply
Batteries:
Battery life:
AC adaptor:
Auto power off:
Speaker output:
Power consumption:
Dimensions (HWD):
Weight:
61 standard-size keys, 5 octaves
100
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)
100
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
Fingering indcators, parts, pedal
PLAY, PAUSE, REW, FF
5 octaves with sharp and flat indications
5 octaves
5 multi-timbre receive
12 steps (–6 semitones to +5 semitones)
Variable (A4 = approximately 440 Hz ± 50 cents)
0 to 9 (10 steps)
IN, OUT
Standard jack
Stereo standard jack
Output Impedance: 78 Ω
Output Voltage: 4 V (RMS) MAX
9 V DC
Dual power supply system
Six D-size batteries
Approximately 10 hours on manganese batteries
AD-5
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
9 V --- 7.7 W
961 × 381 × 139 mm (37-7/8 × 15-1/16 × 5-1/2 inches)
Approximately 5.4 kg (11.91 lbs) (without batteries)
ELECTRICAL
Current drain with 9 V DC:
No sound output
Maximum volume
with 12 keys C1 to B1 pressed in Synth-Lead 1
Volume: Maximum
Phone output level (Vrms with 8 Ω load each channel):
with key G2 pressed in Synth-Lead 1
Speaker output level (Vrms with 4 Ω load each channel):
with key G1 pressed in Synth-Lead 1
Minimum operating voltage:
—1—
120 mA ± 20%
750 mA ± 20%
78 mV ± 20%
1250 mV ± 20%
6.0 V
BLOCK DIAGRAM
COM1 ~ COM16
LCD Driver
SED1278F0A
LSI3
LCD
Buttons
Keyboard
SEG1 ~ SEG40
RS
R/W
E
DB4 ~ DB7
Output
KI0 ~ KI6
MIDI IN
MIDI OUT
—2—
Power Amp.
TA8248K
IC201
Filter (L)
Q206
Filter (R)
Q205
VC
KO8 ~
KO12
KO0 ~ KO7
CPU
MSM 6755B-17
LSI2
MD0 ~ MD7
VCC DVDD
APO
MA0 ~ MA18
DC + 9V IN
Power Supply Circuit
Q201 ~ Q203, Q208, D205
Reset IC
IC1
Oscillator
X1, Q1
ROM(2M-bit)
LC372100PMG48
LSI1
CIRCUIT DESCRIPTION
KEY MATRIX
KI0
KI1
KI2
KI3
KI4
KI5
KI6
KI7
KO0
C2
G#2
E3
C4
G#4
E5
C6
G#6
KO1
C#2
A2
F3
C#4
A4
F5
C#6
A6
KO2
D2
A#2
F#3
D4
A#4
F#5
D6
A#6
KO3
D#2
B2
G3
D#4
B4
G5
D#6
B6
KO4
E2
C3
G#3
E4
C5
G#5
E6
C7
KO5
F2
C#3
A3
F4
C#5
A5
F6
KO6
F#2
D3
A#3
F#4
D5
A#5
F#6
KO7
G2
D#3
B3
G4
D#5
B5
G6
KO8
—
+
0
KO9
3
2
1
Tempo
Down
Start/
Stop
Tempo
Up
Synchro/
Fill-In
Volume
Down
Chord
Book
Volume
Up
Accomp
Volume
KO10
6
5
4
Transpose/
Tune/MIDI
Rhythm
Tone
KO11
9
8
7
Fingered
Song
Bank
CASIO
Chord
Normal
Off
KO12
FF
Right
Play/
Pause
Stop
Left
REW
NOMENCLATURE OF KEYS
C#2 D#2
C2
D2
E2
F#2 G#2 A#2
F2
G2
A2
B2
C#3 D#3
C3
D3
E3
F#3 G#3 A#3
F3
G3
A3
B3
C#4 D#4
C4
D4
E4
F#4 G#4 A#4
F4
G4
—3—
A4
B4
C#5 D#5
C5
D5
E5
F#5 G#5 A#5
F5
G5
A5
B5
C#6 D#6
C6
D6
E6
F#6 G#6 A#6
F6
G6
A6
B6 C7
CPU (LSI2: 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 LSI2.
Pin No.
Terminal
In/Out
Function
1
MA14
Out
2, 3
NCO
—
4 ~ 19
MA0 ~ MA13
Out
Address bus
13
MRDB
Out
Read enable signal
17
MCSB
—
Not used
20 ~ 27
MD0 ~ MD7
In/Out
Data bus
28, 29
NC1, NC2
—
Not used
30
DGND
In
Ground (0 V) source
31
DVCC
In
+5 V source
32, 33
XTLO, XTLI
In/Out
34
NC3
—
Not used
35
RSTB
In
Reset signal input
36
P24/RXD
In
MIDI signal input
37
P25/TXD
Out
38
NMI
In
39
APO
Out
40
NC4
—
41
REFH
Out
42, 43
NC5, NC6
—
44
DAOR
Out
45
NC7
—
Not used
46
AVdac
In
+5 V source for the internal DAC
47
DAOL
Out
Left channel sound waveform output
48
REFL
Out
Terminal for the internal DAC and ADC
49
AGdac
In
Ground source for internal DAC
50
AGadc
In
Ground source for internal ADC
51
ANI
In
APO cancellation signal
52
AVadc
In
+5 V source for the internal ADC
53
NC8
—
Not used
54
MOD0
In
Mode selection terminal. Connected to +5 V.
55, 56
MOD1, MOD2
In
Mode selection terminal. Connected to ground.
57
P40
In
Pedal signal input
58 ~ 64
KI0/P30 ~ KI7/P36
In
Terminals for key/button input signal
65
KI7/P37
—
Not used
66 ~ 73
KO0/P50 ~ KO7/P57
Out
Address bus
Not used
20 MHz clock input/output
MIDI signal output
Power ON signal input. Connected to +5 V.
APO (Auto Power Off) signal output
Not used
Terminal for the internal DAC
Not used
Right channel sound waveform output
Terminals for key scan signal
—4—
Pin No.
Terminal
In/Out
Function
74 ~ 77
DB4 ~ DB7
Out
78
NC9
—
Not used
79
LVCC
In
+5 V source
80 ~ 84
KO8 ~ KO12
Out
Terminals for button scan signal
85 ~ 87
P65 ~ P67
—
Not used
88
RS
Out
Control signal for the LCD driver
89
R/W
Out
Read/Write signal for the LCD driver
90
E
Out
Chip enable signal for the LCD driver
91 ~ 95
P73 ~ P77
—
Not used
96
LGND
In
Ground source
97, 100
MA18, MA15
Out
Data bus for the LCD driver
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
Out
23
VSS
—
24, 25
OSC1, OSC2
In/Out
26 ~ 30
V1 ~ V5
In
31, 32
LP, XCLS
—
Not used
33
VDD
In
DVDD (+5 V) source
34, 35
FR, DO
—
Not used
36
RS
In
Data/command determination terminal.
High: data, Low: command
37
R/W
In
Read/Write terminal. High: read, Low: write
Segment signal output
GND (0 V) source
Terminals for the built-in clock pulse generator. The external
resistor connected determines the oscillation frequency.
LCD drive voltage input.
Those voltages are used for generating the stepped pulse of
the LCD drive signals.
38
E
In
Chip enable signal.
High: enable, the writing is done at fall edge.
Low: disenable
39 ~ 42
DB0 ~ DB3
—
Not used. Connected to GND (0 V)
43 ~ 46
DB4 ~ DB7
In/Out
47 ~ 62
COM1 ~ COM16
Out
Data bus
Common signal/output
—5—
FILTER BLOCK
Since the sound signals from the CPU is stepped waveforms, the filter block is added to smooth the waveforms.
Amp.
TA8248K
CPU
MSM6755B-17
Filter
Block
POWER AMPLIFIER (IC201: TA8248K)
The power amplifier is a two-channel amplifier with standby switch.
The following table shows the pin function of IC201.
Pin No.
Terminal
In/Out
Function
1
NC
—
Not used
2
B.S.2
—
Terminal for a bootstrap capacitor
3
OUT2
Out
4
VCC
In
5
OUT1
Out
6
B.S.1
—
Terminal for a bootstrap capacitor
7
Power GND
In
Ground (0 V) source
8
Stand by
In
Power control signal input. 0 V: Off, +9 V: On
9
DC
—
Terminal for a decoupling capacitor
10
NF1
In
Negative feedback input
11
IN1
In
Channel 1 input
12
IN2
In
Channel 2 input
13
NF2
In
Negative feedback input
14, 15
Pre GND
In
Ground (0 V) source
Channel 2 output
+9 V source
Channel 1 output
—6—
ADJUSTMENT
MAIN PCB
1) Items to be adjusted:
Measuring Instrument
Item
Vop voltage setting
Voltmeter
2) Adjustment and Test Point Locations
(TOP VIEW)
Test point
3) Equipment connection/Procedure
Vop voltage setting
Set
Voltmeter
Output
R62
Input
Connection
Input
Point
Input
Signal
Adjust
VR1
Output
Connection
Output
Point
Voltmeter
R62
Adjust for
Adjust for 4.4 ±0.1 V reading
on voltmeter.
Make fine adjustment according to the next instruction.
Eye
Watching the LCD at a 37° angle to the horizontal, adjust Vop
voltage so that unenergized segments are seen dimly.
37°
LCD
—7—
MAJOR WAVEFORMS
1
2
3
1 Clock pulse
MSM6755B-17 pin 32
2 Power source DVDD
JC connector pin 8
3 APO signal
JC connector pin 2
6
4
7
5
4 Sound waveform (R-ch) Tone: Whistle (59)
JC connector pin 5
Key:
A4
5 Sound waveform (L-ch) Volume: Max.
JC connector pin 4
8
9
8 LCD common signal COM9
SED1278F0A pin 55
9 LCD common signal COM10
SED1278F0A pin 56
—8—
6 Button scan signal KO0
MSM6755B-17 pin 66
7 Button scan signal KO1
MSM6755B-17 pin 67
PRINTED CIRCUIT BOARDS
Main PCB JCM443-MA1M
9
8
3
5
4
6
1
7
Top View
Bottom View
—9—
2
SCHEMATIC DIAGRAMS
Main PCB JCM443-MA1M
4
2
3
5
9
1
8
7
6
— 11 —
Sub PCB JCM443-MA2M
— 12 —
Console PCBs JCM443-CN1M/CN2M
— 13 —
Keyboard PCBs JCM6112K-KY1M/KY2M
— 14 —
COM11
COM12
SEG39
SEG40
COM10
COM9
COM14
COM15
COM16
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
SEG24
SEG25
SEG6
COM16
COM15
COM14
COM13
COM12
COM11
COM10
COM9
COM16
COM15
COM14
COM13
COM7
COM6
COM5
COM4
COM3
COM2
COM1
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
SEG10
SEG21
SEG22
SEG23
SEG24
SEG25
SEG26
SEG27
SEG28
SEG29
SEG30
SEG31
SEG32
SEG33
SEG34
SEG35
SEG36
SEG37
SEG38
SEG39
SEG40
COM11
COM12
SEG39
SEG40
COM10
COM9
COM14
COM15
COM16
SEG11
SEG12
SEG13
SEG14
SEG15
SEG16
SEG17
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
SEG24
SEG25
SEG6
COM16
COM15
COM14
COM13
COM12
COM11
COM10
COM9
COM16
COM15
COM14
COM13
COM7
COM6
COM5
COM4
COM3
COM2
COM1
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
SEG9
SEG10
SEG21
SEG22
SEG23
SEG24
SEG25
SEG26
SEG27
SEG28
SEG29
SEG30
SEG31
SEG32
SEG33
SEG34
SEG35
SEG36
SEG37
SEG38
SEG39
SEG40
LCD
Common
Segment
— 15 —
EXPLODED VIEW
22
13
R-1
13
21
8
7
20
19
14
16
15
17
18
10
3
9
4
2
1
R-2
12
11
23
6
R-3
5
— 16 —
PARTS LIST
CTK-501
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 without 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.
Item
1
LSI1
LSI2
LSI3
IC1
Q1
VR1
X1
2
IC201
IC202
Q201
Q203
D201
D204
D205
J201
J202
J203
J204
3
D302 - D306
LED301
4
D310 - D316
5
D701 - D732
6
D733 - D761
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
Code No.
Parts Name
Main PCB
6926 0460 PCB/ASS'Y (MA1M)
2012 5638 LSI/MASK-ROM
2012 5603 LSI/MC
2012 5569 LSI/LCD DRIVER
2012 1883 IC/MOS
2252 1239 TRANSISTOR
2775 3286 POTENTIOMETER
2590 2100 OSCILLATOR/CERAMIC
Sub PCB
6926 0410 PCB/ASS'Y (MA2M)
2114 5775 IC/LINEAR (POWER AMP.)
2114 1421 IC/PHOTO COUPLER
2250 0168 TRANSISTOR
2220 1409 TRANSISTOR
2251 0921 TRANSISTOR
2390 1323 DIODE/SHOTTKY
2390 1344 DIODE
2390 3018 DIODE
2360 1939 DIODE/ZENER
3501 7049 JACK (POWER)
3612 0665 JACK (PHONE)
3612 0789 JACK
3501 4816 JACK/DIN
Console PCBs
6926 0440 PCB/ASS'Y (CN1M)
2390 1344 DIODE
2370 1383 LED
6926 0450 PCB/ASS'Y (CN2M)
2390 1344 DIODE
Keyboard PCBs
6926 0490 PCB/ASS'Y (KY1M)
2390 1344 DIODE
6926 0500 PCB/ASS'Y (KY2M)
2390 1344 DIODE
Keyboard unit
6922 2720 KEY SET/LT WHITE
6922 2730 KEY SET/LT WHITE
6906 8481 KEY SET/LT BLACK 10P
6906 8491 KEY SET/LT BLACK 5P
6926 0670 RUBBER/CONTACT
6926 0680 RUBBER/CONTACT
Panel unit
3831 0833 SPEAKER
3335 6566 LCD
6926 0270 RUBBER/INTERCONNECTOR
6921 5031 KNOB
6909 5890 SWITCH/SLIDE KONB
6926 0590 RUBBER/BUTTON
6926 0600 RUBBER/BUTTON
6926 0610 RUBBER/BUTTON
6926 0620 RUBBER/BUTTON
6926 0650 PANEL/DISPLAY
6906 8647 COVER/BATTERY
Notes: Q – Quantity per unit
R – Rank
— 17 —
Specification
Q R
M240626*1
LC372100PM-G48TE-L
MSM6755B-17
SED1278F0A
RN5VD40AA-TR
2SC4081T106Q
EVM3SSX50B53
CSACS20.00MX040-TC
1
1
1
1
1
1
1
1
B
A
A
A
B
B
B
B
M140572*1
TA8248K
PC900V
2SA854-SR-TP-T
2SC1740SR-TP-T
2SB1240R-TV2-T
RB100A-T32-T
1SS133T-77-T
1T2
MTZJ5.1C-T77-T
HEC2305-01-330
YKB21-5006
YKB21-5010
YKF51-5051
1
1
1
1
6
1
1
5
1
1
1
1
1
1
B
A
B
A
B
A
B
C
C
A
A
B
B
B
M240623*1
1SS133T-77-T
TLR124(TPJ56,KT)
M240624*1
1SS133T-77-T
1
5
1
1
7
C
B
B
C
B
1
32
1
29
B
B
B
B
M312118*1
M312118*2
M140369A-3
M140369A-4
M240549-1
M240550-1
4
1
2
1
4
1
A
A
A
A
A
A
S12J49A
LD-B10114A
M440435-2
M311859A-1
CSB-12D
M140524-1
M240560-1
M240561-1
M140525-1
M240574-1
M311164G*13
2
1
2
1
1
1
1
1
1
1
1
B
B
B
B
B
B
B
B
B
C
B
M240628*1
1SS133T-77-T
M240629*1
1SS133T-77-T
Item
Code No.
Parts Name
Accessory
6926 1541 STAND/NOTE
Notes:
Specification
M340701A*1
Q – Quantity per unit
R – Rank
— 18 —
Q R
1 B
MA0600571A