Casio CTK-631 User Manual

CTK-631

POPS I

DANCE / FUNK

ROCK II

EUROPEAN

LATIN II / VARIOUS I

REVERB

00 CLUB POP

20 RAP

40 BIG BAND ROCK 60 POLKA 1

80 SALSA

01 EURO POP

21 TRIP HOP

41 SHUFFLE ROCK

61 POLKA 2

81 REGGAE

02 90'S POP

22 TECHNO 1

42 OLDIES POP

62 MARCH 1

82 PUNTA

03 8 BEAT

23 TECHNO 2

43 OLDIES SHUFFLE

63 MARCH 2

83 CUMBIA

04 8 BEAT BALLAD 1

24 FUNKY GROOVE

44 BOOGIE-WOOGIE

64 MARCH 3

84 PASODOBLE

SYNTH

05 8 BEAT BALLAD 2

25 DRUM & BASS

45 50'S ROCK

65 WALTZ

85 RUMBA CATALANA

REVERB

06 60'S 8 BEAT

26 RAVE

46 TWIST

66 FRENCH WALTZ

86 SEVILLANA

07 16 BEAT

27 TRANCE

47 NEW ORLNS R&R

67 BALLROOM WALTZ

87 SKA

HALL

08 16 BEAT BALLAD

28 DISCO

48 CHICAGO BLUES

68 VIENNESE WALTZ

88 TEX-MEX

09 16 BEAT SHUFFLE

29 FUNK

49 R&B

69 TANGO

89 TOWNSHIP

MIXER

STAGE

POPS II

ROCK I

JAZZ

LATIN I

VARIOUS II

10 POP 1

30 AMERICAN ROCK 50 BIG BAND 1

70 BOSSA NOVA 1

90 COUNTRY

ROOM

11 POP 2

31 ROCK

51 BIG BAND 2

71 BOSSA NOVA 2

91 BLUEGRASS

12 70'S ROCK 1

32 70'S ROCK 2

52 SWING 1

72 SAMBA 1

92 FAST GOSPEL

SYNTH

13 POP BALLAD

33 RIFF ROCK

53 SWING 2

73 SAMBA 2

93 SLOW GOSPEL

MEMORY

14 16 BEAT SOUL

34 HEAVY METAL

54 SLOW SWING

74 BEGUINE

94 HAWAIIAN

MIXER

15 SOUL POP

35 POP ROCK

55 ORCH SWING

75 MAMBO

95 BROADWAY

16 WORLD POP

36 SOFT ROCK

56 FUNKY JAZZ

76 RHUMBA

96 EURO FOX

MEMORY

17 FUSION SHUFFLE

37 SLOW ROCK 1

57 JAZZ VOICES

77 CHA-CHA-CHA

97 QUICKSTEP

18 6/8 BALLAD

38 SLOW ROCK 2

58 ACID JAZZ

78 MERENGUE

98 ADANI

STEP

STEP

19 50'S R&B BALLAD

39 ROCK WALTZ

59 JAZZ WALTZ

79 BOLERO

99 BALADI

ACCOMP

POWER

TEMPO

VOLUME

GENERAL

SYN

MODE

VOLUME

O

CH

R

R

T

E

I N

O/

N

D

I

MAX

N

G

FULL RANGE

N

I

BACKLIGHT LCD

CHORD

N

-

FINGERED

O

L

DIGITAL REVARB

CASIO CHORD

R

F

IL

2-WAY MULTI-TRACK MEMORY

M

A

/

NORMAL

L

TIO

MIN

/F

IL

L-IN

IA

VAR

START/STOP

CHORD/1

2

3

4

5

6

DEMO

PIANO

026 JAZZ GUITAR

053 VOICE DOO

SYNTH-LEAD

106 SHAMISEN

000 GRAND PIANO

027 CLEAN GUITAR

054 SYNTH-VOICE

080 SQUARE WAVE

107 KOTO

001 BRIGHT PIANO

028 MUTE GUITAR

055 ORCHESTRA HIT

081 SAWTOOTH WAVE

108 KALIMBA

002 E GRAND PIANO

029 OVERDRIVE GT

BRASS

082 CALLIOPE

109 BAG PIPE

TRANSPOSE/

003 HONKY-TONK

030 DIST GUITAR

056 TRUMPET

083 CHIFF LEAD

110

FIDDLE

004 ELEC PIANO 1

031 GT HARMONICS

057 TROMBONE

084 CHARANG

111

SHANAI

TUNE/MIDI

005 ELEC PIANO 2

BASS

058 TUBA

085 VOICE LEAD

PERCUSSIVE

006 HARPSICHORD

032 ACOUSTIC BASS

059 MUTE TRUMPET

086 FIFTH LEAD

112

TINKLE BELL

GM

007 CLAVI

033 FINGERED BASS

060 FRENCH HORN

087 BASS + LEAD

113

AGOGO

FREE

CHROMATIC PERC

034 PICKED BASS

061 BRASS

SYNTH-PAD

114 STEEL DRUM

008 CELESTA

035 FRETLESS BASS 062 SYNTH-BRASS 1

088 NEW AGE

115

WOOD BLOCK

FREE

SESSION

009 GLOCKENSPIEL

036 SLAP BASS 1

063 SYNTH-BRASS2

089 WARM PAD

116

TAIKO

SESSION

010 MUSIC BOX

037 SLAP BASS 2

REED

090 POLYSYNTH

117 MELODIC TOM

011

VIBRAPHONE

038 SYNTH-BASS 1

064 SOPRANO SAX

091 SPACE CHOIR

118

SYNTH-DRUM

LAYER

012 MARIMBA

039 SYNTH-BASS 2

065 ALTO SAX

092 BOWED GLASS

119

REVERSE CYMBAL

LAYER

013 XYLOPHONE

STR/ORCHESTRA

066 TENOR SAX

093 METALLIC PAD

SOUND EFFECTS

014 TUBULAR BELLS

040 VIOLIN

067 BARITONE SAX

094 HALO PAD

120 GT FRET NOISE

SPLIT

015 DULCIMER

041 VIOLA

068 OBOE

095 SWEEP PAD

121 BREATH NOISE

ORGAN

042 CELLO

069 ENGLISH HORN

SYNTH-SFX

122 SEASHORE

TOUCH

016 DRAWBAR ORGAN

043 CONTRABASS

070 BASSOON

096 RAIN DROP

123 BIRD

SPLIT

017 PERC ORGAN

044 TREMOLO STR

071 CLARINET

097 SOUNDTRACK

124 TELEPHONE

RESPONSE

018 ROCK ORGAN

045 PIZZICATO STR

PIPE

098 CRYSTAL

125 HELICOPTER

019 CHURCH ORGAN

046 HARP

072 PICCOLO

099 ATMOSPHERE

126 APPLAUSE

020 REED ORGAN

047 TIMPANI

073 FLUTE

100 BRIGHTNESS

127 GUNSHOT

TOUCH

021 ACCORDION

ENSEMBLE

074 RECORDER

101 GOBLINS

SYNTH TONE

022 HARMONICA

048 STRINGS 1

075 PAN FLUTE

102 ECHOES

128

159

RESPONSE

023 BANDONEON

049 STRINGS 2

076 BLOWN BOTTLE

103 SF

DRUM SET

GUITAR

050 SYNTH-STR 1

077 SHAKUHACHI

ETHNIC

160

167

024 NYLON STR GT

051 SYNTH-STR 2

078 WHISTLE

104 SITAR

USER TONE

025 STEEL STR GT

052 CHOIR AAHS

079 OCARINA

105 BANJO

168

199

CU	RS	TONE				ENVELOPE
						PITCH
	OR			(TIE)	3
						ENVELOPE
			7	8	9	00 FLAT
							AMP
							ENVELOPE
			4	5	6	01-19 VIBRATO	000-048 DECAY
		REST				20-49 OTHERS	049-137 SUSTAIN
ENTER		0	1	2	3

RHYTHM

CTK-631

INDEX

ELECTRONIC KEYBOARD

CONTENTS

Specifications ...................................................................................................................................	1
Block Diagram ..................................................................................................................................	3
Circuit Description ............................................................................................................................	4
Adjustment .....................................................................................................................................	11
Major Waveforms ...........................................................................................................................	13
Printed Circuit Boards ....................................................................................................................	14
Schematic Diagrams ......................................................................................................................	17
Exploded View ...............................................................................................................................	24
Parts List ........................................................................................................................................	25

	SPECIFICATIONS
GENERAL
Keyboard:	61 standard-size keys, 5 octaves (with touch response on/off)
Drum pads:	6
Tones:	200 (128 General MIDI, 32 synthesized, 8 drum, 32 user); with layer and
	split
Rhythm instrument tones:	61
Polyphony:	24 notes maximum (12 for certain tones)
Digital effects:	3 reverb types (HALL, STAGE, ROOM)
Auto accompaniment
Rhythm patterns:	100
Tempo:	Variable (216 steps, = 40 to 255)
Chords:	4 fingering methods (NORMAL, CASIO CHORD, FINGERED, FULL
	RANGE CHORD)
Rhythm controller:	START/STOP, INTRO, NORMAL/NORMAL FILL-IN, VARIATION/VARI-
	ATION FILL-IN, SYNCHRO/ENDING
Accomp volume:	0 to 127 (128 steps)
Free session
Number of patterns:	100 (auto-accompaniment in accordance with selected chord progres-
	sion)
Memory function
Songs:	2
Recording tracks:	6 (2 through 6 are melody tracks)
Recording methods:	Real-time, step
Memory capacity:	Approximately 5,200 notes (total for two songs)
Edit function:	Equipped
Demo tunes:	2
Synthesizer function
Parameters:	PCM set, amp envelope set, attack rate, release rate, pitch envelope set,
	pitch, level, touch sense, pan
Mixer function
Channels:	16
Parameters:	Program change number, volume, expression, pan, coarse tuning, fine
	tuning, on/off/solo
MIDI:	16 multi-timbre receive, GM Level 1 standard
Other functions
Pitch bend range:	12 semitones upwards and downwards
Transpose:	25 steps (–12 semitones to +12 semitones)
Tuning:	Variable (A4 = approximately 440 Hz ± 50 cents)
Terminals
MIDI terminals:	IN, OUT
Assignable terminal:	Standard jack (sustain, sostenuto, soft, rhythm start/stop)
Headphone/Output terminal:	Stereo standard jack
	Output Impedance: 120 Ω
	Output Voltage: 4.5 V (RMS) MAX
Power supply terminal:	9 V DC
Power supply:	Dual power supply system
Batteries:	6 D-size batteries
Battery life:	Approximately 5 hours continuous operation on manganese batteries
AC adaptor:	AD-5
Auto power off:	Turns power off approximately six minutes after last key operation. En-
	abled under battery power only, can be disabled manually.
Speaker output:	2.5 W + 2.5 W
Power consumption:	9 V --- 7.7 W
Dimensions (HWD):	96.0 × 37.6 × 15.2 cm (37 13/16 × 14 13/16 × 5 15/16 inches)
Weight:	Approximately 5.5 kg (12.1 lbs) (without batteries)

— 1 —

ELECTRICAL

Current drain with 9 V DC:		412 mA ± 20 %
No sound output
Maximum volume		1165 mA ± 20 %
with 12 keys from C3 to B3 pressed in Square wave tone
Volume: maximum, Touch response: maximum
Reverb: Hall
Phone output level (Vrms with 32 Ω load each channel):	L-ch	615 mV ± 20 %
with key A5 pressed in Bassoon tone	R-ch	555 mV ± 20 %
Volume: maximum, Touch response: maximum
Reverb: Hall
Speaker output level (Vrms with 4 Ω load each channel):	L-ch	2780 mV ± 20 %
with key A5 pressed in Bassoon tone	R-ch	2570 mV ± 20 %
Volume: maximum, Touch response: maximum
Reverb: Hall
Output level (Vrms with 47k Ω load each channel):	L-ch	3070 mV ± 20 %
with key A5 pressed in Bassoon tone	R-ch	2750 mV ± 20 %
Volume: maximum, Touch response: maximum
Reverb: Hall
Minimum operating voltage:		6.3 V

About General MIDI

General MIDI standardizes MIDI data for all sound source types, regardless of manufacturer. General MIDI specifies such factors as tone numbering, drum sounds, and available MIDI channels for all sound sources. This standard makes it possible for all MIDI equipment to reproduce the same nuances when playing General MIDI data, regardless of the manufacturer of the sound source.

This keyboard supports General MIDI, so it can be used to play commercially available pre-recorded General MIDI data and General MIDI data send to it from a personal computer.

— 2 —

BLOCK DIAGRAM

		Working Storage
		RAM (256K-bit)		MIDI
		LSI4			P10, P13
				OUT IN
	TC55257DFL-70L(EL)				P14, P17
Reset IC	RESET	MA0	MD0		P23
IC2
		~	~
RN5VD40AA
		MA14	MD7
					CPU
Sound Source ROM		MD0 ~ MD15			LSI1
(24M-bit)
LSI3					GT913F(T)
LH536PY8	MA0 ~ MA19
	MA0, MA1		LRCK, SO
			BCK, SINK
	EA0 ~				NMI
Effect RAM
	EA14		DSP
(256K-bit)
LSI5			LSI2		PA0 ~ PA5
TC55257DFL-	EIO0 ~
70L(EL)
	EIO7		HG51B277FB-1		PB0 ~ PB3
		WCKO			PB4
		SO
		BCK
			D/A Converter
			IC1
			UPD6379GR
			Filter
	Output		Q308 ~ Q311
Speakers			Main
			Volume
			Power Amplifier
			IC301
			TA8248K

SEG1 ~ SEG40

LCD Driver

LSI501	LCD

SED1278F2A

COM1 ~ COM16

FI0 ~ FI9

SI0 ~ SI9

Keyboard

KC0 ~ KC7

KI0 ~ KI2

PB0 ~ PB3

FI10

VDD

Power Switch

Buttons

Assingnable Jack

— 3 —

CIRCUIT DESCRIPTION

KEY MATRIX

	KC0	KC1	KC2	KC3	KC4	KC	KC6	KC7
FI0	C2 (1)	C#2 (1)	D2 (1)	D#2 (1)	E2 (1)	F2 (1)	F#2 (1)	G2 (1)
SI0	C2(2)	C#2 (2)	D2 (2)	D#2 (2)	E2 (2)	F2 (2)	F#2 (2)	G2 (2)
FI1	G#2 (1)	A2 (1)	A#2 (1)	B2 (1)	C3 (1)	C#3 (1)	D3 (1)	D#3 (1)
SI1	G#2 (2)	A2 (2)	A#2 (2)	B2 (2)	C3 (2)	C#3 (2)	D3 (2)	D#3 (2)
FI2	E3 (1)	F3 (1)	F#3 (1)	G3 (1)	G#3 (1)	A3 (1)	A#3 (1)	B3 (1)
SI2	E3 (2)	F3 (2)	F#3 (2)	G3 (2)	G#3 (2)	A3 (2)	A#3 (2)	B3 (2)
FI3	C4 (1)	C#4 (1)	D4 (1)	D#4 (1)	E4 (1)	F4 (1)	F#4 (1)	G4 (1)
SI3	C4 (2)	C#4 (2)	D4 (2)	D#4 (2)	E4 (2)	F4 (2)	F#4 (2)	G4 (2)
FI4	G#4 (1)	A4 (1)	A#4 (1)	B4 (1)	C5 (1)	C#5 (1)	D5 (1)	D#5 (1)
SI4	G#4 (2)	A4 (2)	#4 (2)	B4 (2)	C5 (2)	C#5 (2)	D5 (2)	D#5 (2)
FI5	E5 (1)	F5 (1)	F#5 (1)	G5 (1)	G#5 (1)	A5 (1)	A#5 (1)	B5 (1)
SI5	E5 (2)	F5 (2)	F#5 (2)	G5 (2)	G#5 (2)	A5 (2)	A#5 (2)	B5 (2)
FI6	C6 (1)	C#6 (1)	D6 (1)	D#6 (1)	E6 (1)	F6 (1)	F#6 (1)	G6 (1)
SI6	C6 (2)	C6# (2)	D6 (2)	D#6 (2)	E6 (2)	F6 (2)	F#6 (2)	G6 (2)
FI7	G#6 (1)	A6 (1)	A#6 (1)	B6 (1)	C7 (1)
SI7	G#6 (2)	A6 (2)	A#6 (2)	B6 (2)	C7 (2)

BUTTON MATRIX

		KC0	KC1	KC2	KC3	KC4	KC5	KC6	KC7
	FI10	Chord 3	Chord 1		▼	9	6	+	Tone
	KI0	Chord 4	Chord 2		Start/	8	3	—	Rhythm
					Stop
	KI1	Chord 5	Intro	Tempo	▼	7	2	0	Normal/
				▼					Fill-In
	KI2	Chord 6	Synchro/	Tempo	▼	4	5	1	Variation/
			Ending	▲					Fill-In

		PA0	PA1	PA2	PA3
	PB0	Full Range	Reverb	Mixer	Step
		Chord
	PB1	Fingered	Synth	Memory	Accomp
					Volume
	PB2	Casio Chord	Demo	Free Session	Split
	PB3	Normal	Transpose/	Layer	Touch
			Tune/Midi		Response

— 4 —

Key

Note: Each key has two contacts,

the first conatct (1) and second contact (2).

	FI
Second contact (2)	First contact (1)
	KC
	SI

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

POWER SUPPLY CIRCUIT

The power supply circuit generates five voltages as shown in the following table. VDD voltage is always generated. The others are controlled by APO signal from the CPU.

Name	Voltage	For operation of
VDD	+5 V	CPU, Reset IC, DSP, Sound source ROM, Working storage RAM, Effect RAM
DVDD	+5 V	LCD driver, Power jack, Sustain jack, MIDI jack
AVDD	+5 V	DAC, Filter
LVDD	+5.6 V	LCD dirver
VCC	+9 V	Power amplifier, Pilot lamp

RESET CIRCUIT

When batteries are set or an AC adapter is connected, the reset IC provides a low pulse to the CPU. The CPU then initializes its internal circuit, and clears the working storage RAM.

When the power switch is pressed, the CPU receives a low pulse of POWER signal. The CPU sends APO signal to the power supply circuit, also sends a reset signal to the DSP.

Battery set		VDD		VDD
VDD
			Reset signal	DSP
RESET		PLE
				LSI2
		CPU
Reset IC				HG51B277FB-1
		LSI1
IC2
	GT913F(T)
RN5VD40AA
			APO
		SCKO
POWER	NMI		To power supply circuit
From power switch
		— 5 —

CPU (LSI1: GT913F-(T))

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
	1	TXD0	Out	MIDI signal output
	2	RXD0	In	MIDI signal input
	3	SCK0	Out	APO (Auto Power Off) signal output
	4, 5	TXD1, RXD2	In/Out	Data bus for the LCD driver
	6	SCK1	Out	1 MHZ synchronizing pulse output
	7	AVCC	In	DVDD (+5 V) source
				AC adaptor detection terminal.
	8	AN0	In	+5 V when the keyboard is powered by batteries and becomes
				0 V to cancel the APO function when AC adaptor is connected.
	9	AN1	—	Not used. Connected to ground.
	10	AGND	In	Ground (0 V) source
	11	BCK	Out	Bit clock output
	12	SO	Out	Serial sound data output
	13	LRCK	Out	Word clock output
	14	GND	In	Ground (0 V) source
	15, 16	XLT0, XLT1	In/Out	20 MHz clock input/output
	17	VCC	In	+5 V source
	18, 19	MD0, MD1	In	Mode selection terminal
	20	RSTB	In	Reset signal input
	21	NMI	In	Power ON signal input
	22	INT/P10	In/Out	Data bus for the LCD driver
	23 ~ 30	FI0 ~ FI3	In	Terminal for key input signal
		SI0 ~ SI3
	31 ~ 38	KC0 ~ KC7	Out	Terminal for key scan signal
	39 ~ 46	FI4 ~ FI7	In	Terminal for key input signal
		SI4 ~ SI7
	47 ~ 50	FI8, FI9	—	Not used
		SI8, SI9
	51	FI10	In	Terminal for button input signal
	52	SI10/P23	Out	Chip enable signal for the LCD driver
	53 ~ 55	KI0 ~ KI2	In	Terminal for button input signal
	56	MWNB	Out	Write enable signal for the DSP
	57 ~ 76	MA0 ~ MA17	Out	Address bus
	77	MCSB0	Out	Chip enable signal output for the sound source ROM
	78	MCSB1	Out	Not used
	79	MCSB2	Out	Chip enable signal output for the DSP

— 6 —

Pin No.	Terminal	In/Out	Function
80	VCC	In	+5 V source
81	GND	In	Ground (0 V) source
82	MRDB	Out	Read enable signal output for the sound source ROM
83 ~ 98	MD0 ~ MD15	In/Out	Data bus
99	PLE	Out	Reset signal output for the DSP
100	P17	In/Out	Data bus for the LCD driver

DIGITAL SIGNAL PROCESSOR (LSI2: HG51B227FB-1)

The DSP receives 16-bit serial sound data output from the CPU and adds the selected effect to the sound data using the effect RAM. Then the DSP provides the sound data to the DAC. The DSP also controls button input/ output.

The following table shows the pin functions of LSI2.

Pin No.	Terminal	In/Out	Function
1 ~ 3, 80	PB0 ~ PB3	In	Button input terminals
4	PB4	In	ASSIGNABLE Jack input
5	SO	Out	Serial sound data output for the DAC
6	WCKO	Out	Word clock output for the DAC
7	VDD3	In	+5 V source
8	TEST	—	Not used
9	RESB	In	Reset signal input
10	VSS2	In	Ground (0 V) source
11, 12	XIN, XOUT	In/Out	20 MHz clock input/output
13	WCKI	In	Word clock input from the CPU
14	SI	In	Serial sound data input from the CPU
15	BCKI	In	Bit clock input from the CPU
16	SINC	In	1 MHz synchronizing pulse input
17	VDD2	In	+5 V source
18 ~ 25	IO0 ~ IO7	In/Out	Data bus
26	RCEB	Out	Chip enable signal output for the working storage RAM
27	VSS3	In	Ground (0 V) source
28	AD1	In	Address bus
29	OEB	Out	Output enable signal for working storage RAM
30	WEB	In	Write enable signal
31	VDD3	In	+5 V source
32	CE2	In	Chip enable signal input. High active.
33	AD0	In	Address bus
34	CE1B	In	Chip enable signal input. Low active.
35 ~ 41, 43	EIO0 ~ EIO7	In/Out	Data bus for the effect RAM

— 7 —