Casio CTK-401 User manual

ELECTRONIC KEYBOARD

CTK-401

POWER/MODE

FINGERED

MAIN

VOLUMESYNCHRO/

FILL-IN START/

STOP TEMPO CHORD BOOK M

01234

56789

m 7 M7 dim

aug sus4 -5 add9 CLEAR

ACCOMP VOLUME

CASIO

CHORD

OFF NORMAL

100 RHYTHMS

100 SONG BANK (00-49)

TONE SONG BANK REW STOP FF

100 SONG BANK KEYBOARD

MUSICAL INFORMATION SYSTEM

SONG BANK CONTROLLER

LEFT

ON/OFF RIGHT

ON/OFF

PLAY/

PAUSE

TRANSPOSE/

TUNE

RHYTHM

100 TONES

100 SONG BANK (50-99)

TONE

RHYTHM

SONG BANK

MUSICAL INFORMATION SYSTEM

STATUS

TEMPO

VOLUME

CONTENTS

Specifications................................................................................................................................... 1

Block Diagram.................................................................................................................................. 2

Circuit Description............................................................................................................................ 3

Adjustment ....................................................................................................................................... 7

Major Waveforms ............................................................................................................................. 8

Printed Circuit Boards ...................................................................................................................... 9

Schematic Diagrams ...................................................................................................................... 11

Exploded View ............................................................................................................................... 15

Parts List ........................................................................................................................................ 17

— 1 —

SPECIFICATIONS

GENERAL

Keyboard: 49 standard-size keys, 4 octaves

Tones: 100

Polyphony: 12 notes maximum (6 for certain tones)

Auto accompaniment

Rhythm patterns: 100

Tempo: Variable (236 steps, = 20 to 255)

Chords: 2 fingering methods (CASIO CHORD, FINGERED)

Rhythm controller: START/STOP, SYNCHRO/FILL-IN

Accomp volume: 0 to 9 (10 steps)

Song bank

Tunes: 100

Controllers: PLAY/PAUSE, STOP, REW, FF, LEFT ON/OFF, RIGHT ON/OFF

Musical dictionary

Name display: TONE, RHYTHM, SONG BANK name/number

Tempo: Tempo value, metronome, synchro standby, beat indicator

Chord: Chord name, Chord form

Fingering: Fingering indcators, parts

Song bank status: PLAY, PAUSE, REW, FF, playing

Staff: Four octaves with sharp and flat indications

Keyboard: Four octaves

Other functions

Transpose: 12 steps (–6 semitones to +5 semitones)

Tuning: Variable (A4 = approximately 440 Hz ±50 cents)

Volume: 0 to 9 (10 steps)

Terminals

Phones/Output terminal: Stereo standard jack

Output Impedance: 100 Ω

Output Voltage: 3.0 V (RMS) MAX

Power supply terminal: 9 V DC

Power supply Dual power supply system

Batteries: Six AA-size batteries

Battery life: Approximately 2 hours (SUM-3/R6P)/6 hours (AM3/LR6)

AC adaptor: AD-5

Auto power off: Turns power off approximately six minutes after last key operation. Enabled

under battery power only, can be disabled manually.

Speaker output: 2.0 W + 2.0 W

Power consumption: 9 V --- 7.0 W

Dimensions (HWD): 988 ×332 ×124 mm (38-15/16 ×13-1/16 ×4-7/8 inches)

Weight: Approximately 3.5 kg (7.7 lbs) (without batteries)

ELECTRICAL

Current drain with 9 V DC:

No sound output 100 mA ±20 %

Maximum volume 625 mA ±20 %

with 12 keys C4 to B4 pressed in Synth-Lead 1

Volume: 9 (Max.)

Phone output level (Vrms with 8 Ωload each channel):

with key A4 pressed in Synth-Lead 1 67 mV ±20 %

Speaker output level (Vrms with 4 Ωload each channel):

with key A4 pressed in Synth-Lead 1 900 mV ±20 %

Minimum operating voltage: 5.7 V

— 2 —

BLOCK DIAGRAM

CPU

MSM 6755B-17

LSI1

Keyboard

Buttons

LCD LCD Driver

SED1278F0A

LSI3

Reset IC

IC1 Oscillator

X1, Q1

Power Supply Circuit

Q101 ~ Q103, D104

Power Amp.

TA8248K

IC101

Filter (L)

Q104

Filter (R)

Q105

Output

VC VCC DVDD

APO

MD0 ~ MD7

MA0 ~ MA17

DC + 9 V IN

DB4 ~ DB7

COM1 ~ COM16

SEG1 ~ SEG40

R/W

EKO8 ~

KO12 KI0 ~ KI6

KO0 ~ KO7

ROM(2M-bit)

UM23C2101M

7384/Q

LSI2

— 3 —

CIRCUIT DESCRIPTION

KEY MATRIX

NOMENCLATURE OF KEYS

KI0 KI1 KI2 KI3 KI4 KI5 KI6

KO0 C2 G#2 E3 C4 G#4 E5 C6

KO1 C#2 A2 F3 C#4 A4 F5

KO2 D2 A#2 F#3 D4 A#4 F#5

KO3 D#2 B2 G3 D#4 B4 G5

KO4 E2 C3 G#3 E4 C5 G#5

KO5 F2 C#3 A3 F4 C#5 A5

KO6 F#2 D3 A#3 F#4 D5 A#5

KO7 G2 D#3 B3 G4 D#5 B5

KO8 —+ 0

Tempo

Down Tempo

Up Volume

Down Volume

KO9 321

Start/

Stop Synchro/

Fill-in Chord

Book Accomp

Volume

KO10 654

Transpose/

Tune Song

Bank Rhythm Tone

KO11 9 8 7 Fingered CASIO

Chord Normal Power Off

KO12 FF Right Play/

Pause Stop Left Rewind

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

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

— 4 —

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

2, 3 NCO — Not used

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 20 MHz clock input/output

34 NC3 — Not used

35 RSTB In Reset signal input

36 P24/RXD — Not used. Connected to +5 V.

37 P25/TXD — Not used

38 NMI In Power ON signal input. Connected to +5 V.

39 APO Out APO (Auto Power Off) signal output

40 NC4 — Not used

41 REFH Out Terminal for the internal DAC

42, 43 NC5, NC6 — Not used

44 DAOR Out Right channel sound waveform output

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 — Not used

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 Terminals for key scan signal

— 5 —

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. Terminal In/Out Function

74 ~ 77 DB4 ~ DB7 Out Data bus for the LCD driver

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 Address bus

Pin No. Terminal In/Out Function

1 ~ 22,

63 ~ 80

23 VSS — GND (0 V) source

Terminals for the built-in clock pulse generator. The external

resistor connected determines the oscillation frequency.

LCD drive voltage input.

26 ~ 30 V1 ~ V5 In Those voltages are used for generating the stepped pulse of

the LCD drive signals.

31, 32 LP, XCLS — Not used

33 VDD In DVDD (+5 V) source

34, 35 FR, DO — Not used

Data/command determination terminal.

High: data, Low: command

37 R/W In 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 DB0 ~ DB3 — Not used. Connected to GND (0 V)

43 ~ 46 DB4 ~ DB7 In/Out Data bus

47 ~ 62 COM1 ~ COM16 Out Common signal/output

SEG1 ~ SEG40 Out Segment signal output

24, 25 OSC1, OSC2 In/Out

36 RS In

— 6 —

FILTER BLOCK

Since the sound signals from the CPU is stepped waveforms, the filter block is added to smooth the waveforms.

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 In/Out Function

1 NC — Not used

2 B.S.2 — Terminal for a bootstrap capacitor

3 OUT2 Out Channel 2 output

4 VCC In +9 V source

5 OUT1 Out Channel 1 output

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

Amp.

TA8248K Filter

Block CPU

MSM6755B-17

— 7 —

3) Equipment connection/Procedure

Vop voltage setting

Input

Connection Input

Point Input

Signal Adjust Output

Connection Output

Point Adjust for

VR1 Voltmeter V5 Adjust for 4.3 ±0.1 V reading

on voltmeter.

Makefineadjustmentaccord-

ing to the next instruction.

53.5°

LCD

Eye Watching the LCD at a 53.5°angle to the horizontal, adjust Vop

voltage so that unenergized segments are seen dimly.

ADJUSTMENT

MAIN PCB

1) Items to be adjusted:

2) Adjustment and Test Point Locations

(TOP VIEW)

Item Measuring Instrument

Vop voltage setting Voltmeter

Test point

Output

Set Voltmeter

— 8 —

MAJOR WAVEFORMS

1Clock pulse

MSM6755B-17 pin 32

2+5 V source DVDD

JC connector pin 6

3APO signal

JC connector pin 5

4Sound waveform (R-ch) Tone: Whistle

JC connector pin 4 Key: A4

5Sound waveform (L-ch) Volume:

JC connector pin 3

6Button scan signal KO6

JA connector pin 14

7Button scan signal KO7

JA connector pin 15

8LCD common signal COM9

SED1278F0A pin 55

9LCD common signal COM10

SED1278F0A pin 56

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