CTK-541
JULY.1999
E
E 
E
CTK-541
ELECTRONIC KEYBOARD
INDEX
CONTENTS
Specifications ................................................................................................................................... |
1 |
Block Diagram .................................................................................................................................. |
3 |
Circuit Description ............................................................................................................................ |
4 |
Adjustment ....................................................................................................................................... |
8 |
Major Waveforms ........................................................................................................................... |
10 |
Printed Circuit Boards .................................................................................................................... |
11 |
Schematic Diagrams ...................................................................................................................... |
15 |
Exploded View ............................................................................................................................... |
19 |
Parts List ........................................................................................................................................ |
20 |
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SPECIFICATIONS |
GENERAL |
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Keyboard: |
61 standard-size keys, 5 octaves (with touch response on/off) |
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Tones: |
100 |
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Polyphony: |
16 notes maximum (8 for certain tones) |
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Auto accompaniment |
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Rhythm patterns: |
100 |
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Tempo: |
Variable (236 steps, = 20 to 255) |
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Chords: |
2 fingering methods (CASIO CHORD, FINGERED) |
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Rhythm controller: |
START/STOP, SYNCHRO/FILL-IN |
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Accomp volume: |
0 to 9 (10 steps) |
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Song bank |
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Tunes: |
100 |
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Controllers: |
PLAY/PAUSE, STOP, REW, FF, LEFT ON/OFF (ACCOMP), RIGHT ON/ |
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OFF (MELODY) |
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Display |
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Name display: |
TONE, RHYTHM, SONG BANK name/number, keyboard settings name/value |
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Tempo: |
Tempo value, metronome, synchro standby, beat indicator |
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Chord: |
Chord name, Chord form |
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Fingering: |
Fingering indicators, parts, pedal |
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Song bank status: |
PLAY, PAUSE, REW, FF |
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Staff: |
5 octaves with sharp and flat indications |
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Keyboard: |
5 octaves |
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MIDI: |
5 multi-timbre receive |
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Other functions |
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Transpose: |
12 steps (–6 semitones to +5 semitones) |
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Tuning: |
Variable (A4 = approximately 440 Hz ± 50 cents) |
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Volume: |
0 to 9 (10 steps) |
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Terminals |
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MIDI terminals: |
IN, OUT |
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Sustain terminal: |
Standard jack |
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Phones/Output terminal: |
Stereo standard jack |
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Output Impedance: 50 Ω |
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Output Voltage: 3.5 V (RMS) MAX |
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Power supply terminal: |
9 V DC |
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Power supply |
DC 9 V |
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Batteries: |
6 D-size batteries |
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Battery life: |
Approximately 5 hours on manganese batteries |
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Auto power off: |
Turns power off approximately six minutes after last key operation. Enabled |
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under battery power only, can be disabled manually. |
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Speaker output: |
2.0 W + 2.0 W |
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Power consumption: |
9 V |
--- |
7.7 W |
Dimensions (HWD): |
961 × 376 × 143 mm (37-7/8 × 14-13/16 × 5-5/8 inches) |
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Weight: |
Approximately 5.7 kg (12.6 lbs) (without batteries) |
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— 1 —
ELECTRICAL
Current drain with 9 V DC: |
Nominal |
Limit |
No sound output |
330 mA |
330 mA ± 20% |
Maximum volume |
990 mA |
990 mA ± 20% |
with 16 keys C1 to D3 pressed in Synth-Lead 1 |
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Volume: Maximum, Touch response: ON(Velocity MAX) |
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Phone output level (Vrms with 8 Ω load each channel): |
L 240mV |
240 mV ± 20% |
with key C3 pressed in Synth-Lead 1 |
R 250mV |
250 mV ± 20% |
Speaker output level (Vrms with 4 Ω load each channel): |
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with key G1 pressed in Synth-Lead 1 |
L/R 2500mV |
2500 mV ± 20% |
Output level (Vrms with 47 KΩ load each channel): |
L 2300mV |
2300 mV ± 20% |
with key C2 pressed in Synth-Lead 1 |
R 2400mV |
2400 mV ± 20% |
Minimum operating voltage: |
6.3V |
7.0V |
— 2 —
— 3 —
BLOCK DIAGRAM
COM1 ~ COM16
LCD Driver
LCD KS0066U-10B
LSI3
Buttons |
Keyboard |
SEG1 ~ SEG40
RS
DB4 ~ DB7 R/W KI0,KI1 FI0 ~ FI7
E FI8~FI10
Phone/Output |
MIDI IN |
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MIDI OUT |
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Filter (L) |
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Power Amp. |
Q206 |
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TA8248K |
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IC201 |
Filter (R) |
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Q205 |
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VC |
VCC DVDD AVDD |
APO |
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DC + 9V IN |
Power |
Supply Circuit |
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Q201 ~ Q203, Q207, Q208, D205
Power Switch
KC0 ~ KC7
CPU
GT913F(T) MD0 ~ MD15
LSI1
ROM(8M-bit)
MA0 ~ MA19 MSM538002E-
N8GS - KDR1
LSI2
Reset IC |
Oscillator |
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UPD6379GR-E1 |
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X1, Q1 |
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IC1 |
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CIRCUIT DESCRIPTION
KEY MATRIX
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KI0 |
KI1 |
KI2 |
KI3 |
KI4 |
KI5 |
KI6 |
KI7 |
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KO0 |
C2 |
G#2 |
E3 |
C4 |
G#4 |
E5 |
C6 |
G#6 |
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KO1 |
C#2 |
A2 |
F3 |
C#4 |
A4 |
F5 |
C#6 |
A6 |
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KO2 |
D2 |
A#2 |
F#3 |
D4 |
A#4 |
F#5 |
D6 |
A#6 |
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KO3 |
D#2 |
B2 |
G3 |
D#4 |
B4 |
G5 |
D#6 |
B6 |
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KO4 |
E2 |
C3 |
G#3 |
E4 |
C5 |
G#5 |
E6 |
C7 |
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KO5 |
F2 |
C#3 |
A3 |
F4 |
C#5 |
A5 |
F6 |
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KO6 |
F#2 |
D3 |
A#3 |
F#4 |
D5 |
A#5 |
F#6 |
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KO7 |
G2 |
D#3 |
B3 |
G4 |
D#5 |
B5 |
G6 |
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KO8 |
— |
+ |
0 |
Tempo |
Tempo |
Volume |
Volume |
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Down |
Up |
Down |
Up |
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KO9 |
3 |
2 |
1 |
Start/ |
Synchro/ |
Chord |
Accomp |
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Stop |
Fill-In |
Book |
Volume |
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KO10 |
6 |
5 |
4 |
Transpose/ |
Song |
Rhythm |
Tone |
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Tune/MIDI |
Bank |
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KO11 |
9 |
8 |
7 |
Fingered |
CASIO |
Normal |
Off |
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Chord |
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KO12 |
FF |
Right |
Play/ |
Stop |
Left |
REW |
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Pause |
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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 |
C#6 D#6 |
F#6 G#6 A#6 |
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 |
D6 |
E6 |
F6 |
G6 |
A6 |
B6 |
C7 |
— 4 —
CPU (LSI1: GT-913F)
The 16-bit CPU contains a 1k-byte RAM, three 8-bit I/O ports, two timers, a key controller 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 DSP. The CPU also controls MIDI input/output and stores sequencer data into the working storage RAM.
The following table shows the pin functions of LSI1.
Pin No. |
Terminal |
In/Out |
Function |
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1 |
TXD0 |
Out |
MIDI signal output |
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2 |
RXD0 |
In |
MIDI signal input |
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3 |
SCK0 |
Out |
APO (Auto Power Off) signal output |
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4, 5 |
TXD/P13, |
In/Out |
Data bus for the LCD driver |
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RXD/P14 |
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6 |
SCK1 |
Out |
1 MHZ synchronizing pulse output |
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7 |
AVCC |
In |
CVDD (+5 V) source |
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AC adaptor detection terminal. |
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8 |
AN0 |
In |
+5 V when the keyboard is powered by batteries and becomes 0 V |
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to cancel the APO function when AC adaptor is connected. |
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9 |
AN1 |
In |
Input from pitch bender |
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10 |
AGND |
In |
Ground (0 V) source |
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11 |
BCK |
Out |
Bit clock output |
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12 |
SO |
Out |
Serial sound data output |
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13 |
LRCK |
Out |
Word clock output |
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14 |
GND |
In |
Ground (0 V) source |
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15, 16 |
XLT0, XLT1 |
In/Out |
30 MHz clock input/output |
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17 |
VCC |
In |
+5 V source |
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18, 19 |
MOD0, MOD1 |
In |
Mode selection terminal |
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20 |
RSTB |
In |
Reset signal input |
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21 |
NMI |
In |
Power ON signal input |
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22 |
INT/P10 |
In/Out |
Data bus for the LCD driver |
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23 ~ 30 |
FI0 ~ FI3 |
In |
Terminal for key input signal |
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SI0 ~ SI3 |
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31 ~ 38 |
KC0 ~ KC7 |
Out |
Terminal for key scan signal |
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39 ~ 50 |
FI4 ~ FI9 |
In |
Terminal for key input signal |
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SI4 ~ SI9 |
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51 |
FI10 |
In |
Terminal for button input signal |
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52 |
SI10/P23 |
Out |
Chip enable signal for the LCD driver |
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53 ~ 55 |
KI0 ~ KI2 |
In |
Terminal for button input signal |
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56 |
MWNB |
Out |
Write enable signal for the DSP |
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57 ~ 76 |
MA0 ~ MA19 |
Out |
Address bus |
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77 |
MCSB0 |
Out |
Chip enable signal output for the sound source ROM |
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78 |
MCSB1 |
Out |
Not used |
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79 |
MCSB2 |
Out |
Chip enable signal output for the DSP |
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— 5 —
Pin No. |
Terminal |
In/Out |
Function |
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80 |
VCC |
In |
+5 V source |
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81 |
GND |
In |
Ground (0 V) source |
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82 |
MRDB |
Out |
Read enable signal output for the sound source ROM |
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83 ~ 98 |
MD0 ~ MD15 |
In/Out |
Data bus |
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99 |
PLE |
Out |
Reset signal output for the DSP |
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100 |
P17 |
In/Out |
Data bus for the LCD driver |
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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 KS0066U-10B.
Pin No. |
Terminal |
In/Out |
Function |
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1 ~ 22, |
SEG1 ~ SEG40 |
Out |
Segment signal output |
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63 ~ 80 |
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23 |
VSS |
— |
GND (0 V) source |
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24, 25 |
OSC1, OSC2 |
In/Out |
Terminals for the built-in clock pulse generator. The external |
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resistor connected determines the oscillation frequency. |
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LCD drive voltage input. |
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26 ~ 30 |
V1 ~ V5 |
In |
Those voltages are used for generating the stepped pulse of |
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the LCD drive signals. |
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31, 32 |
LP, XCLS |
— |
Not used |
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33 |
VDD |
In |
DVDD (+5 V) source |
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34, 35 |
FR, DO |
— |
Not used |
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36 |
RS |
In |
Data/command determination terminal. |
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High: data, Low: command |
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37 |
R/W |
In |
Read/Write terminal. High: read, Low: write |
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Chip enable signal. |
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38 |
E |
In |
High: enable, the writing is done at fall edge. |
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Low: disenable |
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39 ~ 42 |
DB0 ~ DB3 |
— |
Not used. Connected to GND (0 V) |
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43 ~ 46 |
DB4 ~ DB7 |
In/Out |
Data bus |
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47 ~ 62 |
COM1 ~ COM16 |
Out |
Common signal/output |
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— 6 —
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