Casio CTK-480 User Manual

CTK-480

100 TONES

s A m			I K				M ^ [/x [ X			X g O X/A T u				u X			[ h/p C v				V Z T E h 1
00	s A m 1		10	G N g b N I K 1			20	K b g M ^ [		30	o C I			40	g y b g		50	\ v m T b N X			60	V Z [ h 1
01	s A m 2		11	G N g b N I K 2			21	A R [ X e B b N M ^ [		31	‘ F			41	‘ [ o		51	A g T b N X			61	V Z [ h 2
02	z L [ g N		12	G N g b N I K 3			22	W Y M ^ [		32	n [ v			42	u X Z N V		52	e i [ T b N X			62	V Z [ h 3
03	X ^ W I s A m		13	G N g b N I K 4			23	G N g b N M ^ [		33	X g O X 1			43	t ‘ z 1		53	I [ { G			63	V Z J I y
04	G N g b N s A m 1		14	‘ [ ‘ I K			24	~ [ g M ^ [		34	X g O X 2			44	t ‘ z 2		54	N l b g			64	V Z p b h 1
05	G N g b N s A m 2		15	p C v I K			25	f B X g [ V M ^ [		35	X g O X 3			45	u X 1		55	s b R			65	V Z p b h 2
06	G N g b N s A m 3		16	[ h I K			26	E b h x [ X		36	V Z X g O X 1			46	u X 2		56	t [ g			66	V Z p b h 3
07	G N g b N s A m 4		17	A R [ f B I			27	G N g b N x [ X		37	V Z X g O X 2			47	V Z u X 1		57	R [_[			67	O X n [ j J
08	n [ v V R [ h		18	o h l I			28	X b v x [ X		38	N C A			48	V Z u X 2		58	t [ g A T u			68	J g [ t @ [
09	N u G N g		19	n [ j J			29	o W [		39	{ C X			49	V Z u X 3		59	z C b X			69	V Z x [ X
													POWER/MODE				VOLUME SYNCHRO/				START/			TEMPO
V Z T E h 2			C [				X v b g											¢	FILL-IN		STOP			¢
70	p [ h b v		80	X g O X s A m			90	x [ X/s A m							FINGERED
71	R Y ~ b N T E h		81	X g O X G s			91	x [ X/G s
72	T E h g b N		82	N C A G s			92	x [ X/o C u					ON		CASIO CHORD
73	X y [ X p b h		83	N C A I K			93	x [ X/K b g M ^ [							NORMAL
74	V ZSFX		84	X g O X M ^ [			94	x [ X/f B X g [ V M ^ [
75	ł ˚ „ 1 (Ł ¤)		85	X g O X n [ v			95	X g O X/s A m					OFF
76	ł ˚ „ 2 (d b)		86	u X X g O X			96	X g O X/g y b g
77	ł ˚ „ 3 (F)		87	o C u p b h			97	r u t H																⁄
78	ł ˚ „ 4 (C x [_[)		88	12• M ^ [			98	} o										⁄
79	ł ˚ „ 5 (t @ j [)		89	N C A X g O X 99				p [ J b V															TRANSPOSE/TUNE

MULTI FUNCTION DISPLAY

TONE RHYTHM

SONG

			50 RHYTHMS								20 SONG BANK
| b v X		b N		W Y/ _X		[ s A/e » …				00	A C l E N C l E i n g E W [ N	10	W O x
00	| b v t [ W10		b N c	20	r b N o h	30	| J	40	Q	01	« « fl	11
01	o [ h	11	X [ b N	21	X [ X C O	31	} [ ‘	41	Q G	02	' ¢ ¢ I [ K X ‘	12	A v X Œ
02	| b v o [ h	12	\ t g b N 1	22	t H b N X g b g32		c @1	42	X J	03	A C W O E O C X	13	T ^ E ‘ A
03	b v | b v	13	\ t g b N 2	23	W Y c	33	c @2	43	e b N X b N X	04		14	„ s i
04	\ E o [ h	14	t H [ L [ | b v24		A V b h W Y	34	^ S	44	t H N [	05	h ·	15	A n E I G
05	t @ L [ | b v15		60's\ E	25	e t [ W35		{ T m o	45	J g [	06	h f [	16	t w l G x Ł
06	16r [ g	16	b N	26	g X	36	T o	46	S X y	07	O [ X [ u X	17	F ‹ æ
07	8r [ g 1	17	w r [ ^	27	f B X R	37	} {	47	A_j	08	‰ Ø ı	18	s i ¨ w › Ø Ł l ‘ x
08	8r [ g 2	18	50'sb N	28	b v	38	o	48	o b N	09	º ˘ – … Ł ˜	19	G ^ [ e B i [
09	| b v X	19	V J S u [ X	29	t @ N	39	‘ ‘ ‘	49
0	1	2	3	4	TONE
							MELODY
							ON/OFF
5	6	7	8	9	RHYTHM

CTK-480

ELECTRIONIC KEYBOARD

	CONTENTS
Specifications ..........................................................................................................................	2
Block Diagram .........................................................................................................................	3
Circuit Description ...................................................................................................................	4
Troubleshooting ......................................................................................................................	7
Major Waveforms ....................................................................................................................	8
Schematic Diagrams ...............................................................................................................	9
Printed Circuit Boards ...........................................................................................................	11
Exploded View ......................................................................................................................	13
Parts List ...............................................................................................................................	15

	SPECIFICATIONS
GENERAL
Number of keys:	61
Polyphonic:	12-note
Preset tones:	100
Auto-rhythms:	50, Tempo control: 40 to 255
Accompaniment:	CONCERT Chord, Fingered
Song bank:	20-tune
Tuning control:	440 Hz ± 50 cents
Built-in speakers:	4 inch dia. 1 W input rating: 2 pcs
Terminals:	Headphone Jack (Output impedance: 50 ohm, Output voltage: 4.6 V (rms) MAX
Power source:	2-way AC or DC source
	AC: AC adapter
	DC: 6D size dry batteries, Vehicle battery with DC adapter
Power consumption:	7.7 W
Dimensions(HWD):	90 × 910 × 322 mm (3-1/2 × 36-3/16 × 12-11/16 inches)
Weight:	3.9 kg (8 lbs) excluding batteries

ELECTRICAL

Current drain with 9 V DC:	120 mA ± 30%
No sound output
Maximum volume	650 mA ± 30%
with white keys C1 to G2 pressed in Synth-Lead 1
Volume: 9
Phone output Level (Vrms with 8 ohm load each channel):	80 mV ± 30%
with key E3 pressed in Synth-Lead 1
Sound Pressure (at 10 cm away from speaker):	100 dB ± 10 dB
with key E3 pressed in Synth-Lead 1
Minimum operating voltage:	6.0 V

— 2 —

BLOCK DIAGRAM

LED		Buttons

				La ~ Lg,
Output				Lp
			CC1 ~ CC3	KO8 ~	KI0 ~ KI7
				KO11
			Filter (L)
		Power Amp.	Q109
		LA4598			Keyboard
—		IC101	Filter (R)
— 3
			Q110	CPU
VC	VCC	AVDD DVDD LVDD		MSM 6755B-06
			APO	LSI101
Power		Supply Circuit			KO0 ~ KO7
Q101 ~ Q104, D108, D109
DC+9V IN

Q105

Reset IC		Oscillator
IC102		X101, Q111

CIRCUIT DESCRIPTION

KEY MATRIX

		KI0	KI1	KI2	KI3	KI4	KI5	KI6	KI7
	KO0	C1	G#1	E2	C3	G#3	E4	C5	G#5
	KO1	C#1	A1	F2	C#3	A3	F4	C#5	A5
	KO2	D1	A#1	F#2	D3	A#3	F#4	D5	A#5
	KO3	D#1	B1	G2	D#3	B3	G4	D#5	B5
	KO4	E1	C2	G#2	E3	C4	G#4	E5	C6
	KO5	F1	C#2	A2	F3	C#4	A4	F5
	KO6	F#1	D2	A#2	F#3	D4	A#4	F#5
	KO7	G1	D#2	B2	G3	D#4	B4	G5
	KO8	0	1	2	3	4	Start/Stop	Tempo	Volume
								Up	Up
	KO9	5	6	7	8	9	Tempo	Volume	Synchro/
							Down	Down	Fill-In
	K10	Tone	Rhythm	Song	Melody
				Bank	On/Off
	K11					Fingered	CONCERT	Normal	Power Off
							Chord

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 (LSI101: MSM6755B-06)

The CPU contains a sound data ROM and a DAC (Digital to Analog Convertor), and it provides left and right channel sound waveforms in accordance with the pressed key and the selected tone.

The following table shows the pin functions of LSI101.

Pin No.	Terminal	In/Out	Function
1 ~ 29	MA14 ~ NC2	—	Not used.
30	DGND	In	Ground (0V) source
31	DVCC	In	+5V source
32, 33	XTLO, XTLI	In/Out	20MHz clock input/output
34	NC3	—	Not used. Connected to ground.
35	RSTB	In	Reset signal input
36	P24/RXD	—	Not used. Connected to +5V.
37	P25/TXD	—	Not used.
38	NMI	In	Power on signal input
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	+5V source for the internal DAC and ADC
47	DAOL	Out	Left channel sound waveform output
48	REFL	Out	Terminal for the internal DAC and ADC
49	AGdac	In	Ground source for the internal DAC
50	AGadc	In	Ground source for the internal ADC
51	ANI	—	Not used. Connected to ground.
52	AVadc	In	+5V source for the internal ADC
53	NC8	—	Not used. Connected to +5V.
54	MOD0	In	Mode selection terminal
55, 56	MOD1, MOD2	In	Mode selection terminal
57	KO9/P40	In	Power source detection signal input
58 ~ 65	KI0/P30 ~ KI7/P37	In	Terminals for key/button input signal
66 ~ 73	KO1/P50 ~ KO8/P57	Out	Terminals for key scan signal
74 ~ 77	P20 ~ P23	Out	Terminals for button input signal
78	NC9	—	Not used.
79	LVCC	In	+5V source
80 ~ 82	CC1 ~ CC3	Out	LED common signal output
83 ~ 87	—	—	Not used.
88 ~ 95	La ~ Lg, Lp	Out	Not used.
96	LGND	In	Ground (0V) source
97 ~ 100	—	—	Not used.

FILTER BLOCK

Since the sound signal from the CPU is a stepped waveform, the filter block is added to smooth the waveform.

AVDD	10
	µ
	10 V 22	+
		AG

16 V 10 µ

+

To main volume

	2SC1740SQ
	10 K	10 K
	C332(H)
2.2 K	C221B (A)	C152 (H)

AG

AG

AG

10 K

From the CPU

33 K

AG

— 5 —