Casio CTK-620L User Manual

CTK-620L

100 RHYTHMS

RHYTHMS

TONE

			137 TONES
			REVERB
			TOUCH
			RESPONSE
MODE	VOLUME	INTRO	SYNCHRO/ENDING
			METRONOME
			TEMPO
POWER	MAX
	FULL RANGE		BEAT
	CHORD
	FINGERED
	CASIO CHORD		ACCOMP
	NOMAL		VOLUME
	MIN	NORMAL/FILL-IN	VARIATION/FILL-IN

START/STOP

100 SONG BANK

SONG

BANK

	MUSICAL INFORMATION SYSTEM		TRANSPOSE/		SONG BANK
REVERB
			TUNE/MIDI
HALL		GM						(TIE)	3
STAGE		LAYER	LAYER				7	8	9
ROOM		SPLIT
TOUCH		MEMORY	SPLIT RHYTHM			TONE
RESPONSE							4	5	6
KEY LIGHT		STEP
			MEMORY	TRACK 1		TRACK 2			DEMO
	SONG BANK CONTROLLER			LEFT		RIGHT	1	2	3
KEY LIGHT	STOP PLAY/PAUSE REW	FF	STEP	3-STEP LESSON
				STEP 1	STEP 2 STEP 3
							REST
				1	2	3	0

CTK-620L

ELECTRONIC KEYBOARD

	CONTENTS
	Page
Specifications ............................................................................................................................................	1
Block Diagram ...........................................................................................................................................	3
Circuit Description .....................................................................................................................................	4
Adjustment ..............................................................................................................................................	12
Major Waveforms ....................................................................................................................................	13
Printed Circuit Boards .............................................................................................................................	14
Schematic Diagrams ...............................................................................................................................	15
Exploded View ........................................................................................................................................	28
Parts List .................................................................................................................................................	29
	SPECIFICATIONS
GENERAL
Keyboard:	61 standard-size keys, 5 octaves (with touch response on/off)
Key light system:	Can be turned on and off (up to 10 keys can be lit at the same time)
Tones:	137 (128 General MIDI tones + 9 drum tones); 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:	3 fingering methods (CASIO CHORD, FINGERED, FULL RANGE
	CHORD)
Rhythm controller:	START/STOP, INTRO, NORMAL/NORMARL FILL-IN, VARIATION/
	VARIATION FILL-IN, SYNCHRO/ENDING
Accomp volume:	0 to 127 (128 steps)
3-step lesson:	3 lessons (step 1, 2, 3)
Playback:	Repeat play of a single tune
Song bank
Number of tunes:	100
Controllers:	PLAY/PAUSE, STOP, FF, REW, LEFT, RIGHT
Musical information function:	Tone, Auto Accompaniment, Song Bank numbers and names; staff nota-
	tion, tempo, metronome, measure and beat number, step lesson display,
	chord name, dynamic mark, fingering, pedal operation
Metronome:	On/Off
Beat specification:	1 to 6
Memory
Songs:	2
Recording tracks:	2
Recording methods:	Real-time, step
Memory capacity:	Approximately 5,200 notes (total for two songs)
MIDI:	16 multi-timbre receive, GM Level 1 standard
Other functions
Transpose:	25 steps (–12 semitones to +12 semitones)
Tuning:	101 steps (A4 = approximately 440 Hz ± 50 cents)
Terminals
MIDI terminals:	IN, OUT
Assignable jack:	Standard jack (sustain, sostenuto, soft, rhythm start/stop)
Headphone/output terminal:	Stereo standard jack
Output Impedance:	100 Ω
Output voltage:	4.5 V (RMS) MAX

— 1 —

Power jack	9 V DC
Power supply:	2-way
Batteries:	Six 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):	96.1 × 39.1 × 14.4 cm (37 7/8 × 15 3/8 × 5 11/16 inches)
Weight:	Approximately 6.0 kg (13.25 lbs) (without batteries)

ELECTRICAL

Current drain with 9 V DC:	200 mA ± 20 %
No sound output
Maximum volume	1090 mA ± 20 %
with 10 keys from F1 to A2 pressed in French Horn
Volume: maximum, Touch response: maximum
Reverb: stage
Speaker output level (Vrms with 4 Ω load each channel):
with key C1 for R-ch, F1 for L-ch in French Horn	2300 mV ± 20 %
Volume: maximun, Touch response: maximum
Reverb: stage
Phone output level (Vrms with 8 Ω load each channel):
with key C1 for R-ch, F1 for L-ch in French Horn	180 mV ± 20 %
Volume: maximun, Touch response: maximum
Reverb: stage
Output level (Vrms with 47 Ω load each channel):
with key C1 for R-ch, F1 for L-ch in French Horn	2600 mV ± 20 %
Volume: maximun, Touch response: maximum
Reverb: stage
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							LCD Driver		SEG1 ~ SEG40
		RAM (256K-bit)		MIDI		PO10, PO17
			LSI4								LCD
				OUT	IN					LSI401
						PO22, PO23
		TC55257DFL-70L(EL)
						PA4 ~ PA6		SED1278F0A
										COM1 ~ COM16
			RACEB
Reset IC IC1
	RESET	MA0	MD0
RN5VD40AA									FI0 ~ FI7
			~
		~									Illuminant
		MA14	MD7						SI0 ~ SI7
					CPU				KC0 ~ KC7		Keyboard
Sound Source ROM		MD0 ~ MD15									L21
										LED
(24M-bit)					LSI1		GA				~ L23
LSI3						MD0 ~ 3				Driver
LH536PNV	MA0 ~ MA19						LSI7			Q12 ~ Q14
				GT913F(T)
	MCSB0					MA0 ~ 2	UPD65005			LED
							GF-419				LED
										Driver
RDCEB											L0
							LCBE			Q1 ~ Q11
	MCSB0, 1										~ L20
						KI0 ~ KI2
Chip Selector
	MA19
IC2,3
		MA0,		LRCK, SO		FI9
						FI10				VDD
		MA1		BCK, SINK
	CE1B					NMI					Power Switch
Effect RAM	ECEB
				DSP
(256K-bit)	EA0 ~					PA0, PA1
										Buttons
LSI5	EA14			LSI2
TC55257DFL-
	EIO0 ~					PB0 ~ PB3
70L(EL)			HG51B277FB-1
	EIO7
						PB4

LRCK			Assingnable Jack
SO
BCK
	D/A Converter	LCDD	LVDD DVDD VLCC
		VCC AVDD VDD VC
	LSI6
	UPD6379GR-E1
R OUT		L OUT	Power Supply Circuit
		APO
	Filter		Q201 ~ Q208,
Phones/			D206 ~ 208, D210
	Q213 ~ Q216
Output
Speakers	Main
	Volume
(L)
	Power Amplifier
	IC201
(R)	TA8229K

— 3 —

CIRCUIT DESCRIPTION

KEY MATRIX

	KC0	KC1	KC2	KC3	KC4	KC5	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)	A#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

KI0

MEMORY

STEP 2

3

TONE

5

TEMPO

TEMPO

SYNCHRO/

ENDING

KI1

STEP

STEP 3

—

7

6

ACC. VOL.

TIME

METRO

KI2

STEP 1

0

+

4

DEMO

TOUCH

REVERB

FI9

LAYER

TRACK 1/

2

RHYTHM

9

PLAY/PAUSE

STOP

KEYLIGHT

RIGHT

FI10

SPLIT

TRACK 1/

1

SONG

8

FF

REWIND

TRANSPOSE/

LEFT

TUNE/MIDI

		PA0	PA1
	PB0	INTRO	FULL RANGE
			CHORD
	PB1	NORMAL	FINGERED
		FILL-IN
	PB2	VARIATION	CASIO
		FILL-IN	CHORD
	PB3	START/	NORMAL
		STOP

— 4 —

LED MATRIX

	L0	L1	L2	L3	L4	L5	L6	L7	L8	L9	L10
L21	A2#	F4	B4	E5	A5	D6	G6	C7	A6#	G6#	F6#
L22	G2#	E4	A4	D5	G5	C6	F6	B6	A5#	C6#	D6#
L23	C2	D4	G4	C5	F5	B5	E6	A6	G5#	F5#	D5#

	L11	L12	L13	L14	L15	L16	L17	L18	L19	L20
L21	C3#	D3#	F3#	G2	C3	F3	D4#	C4#	A3#	G3#
L22	F2#	D2#	C2#	F2	B2	E3	F4#	G4#	A4#	C5#
L23			D2	E2	A2	D3	G3	A3	B3	C4

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

— 5 —

POWER SUPPLY CIRCUIT

The power supply circuit generates seven 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,
			LED driver
	DVDD	+5 V	CPU, Sustain jack, MIDI jack
	AVDD	+5 V	DAC, Filter
	LVDD	+5 V	GA
	VCC	+9 V	Power amplifier
	VLCC	+2 V	Pilot lamp
	LCDD	+5.6 V	LCD driver

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
	RESET	RSTB	PLE
			CPU
	Reset IC
			LSI1
	IC1
		GT913F
	RN5VD40AA
	POWER	NMI	SCK0
	From power switch

	VDD
Reset signal	DSP
RESB
	LSI2
HG51B277FB-1
APO
To power supply circuit

— 6 —

CPU (LSI1: GT913F)

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	Not used
	2	RXD0	In	Not used
	3	SCK0	Out	APO (Auto Power Off) signal output
	4	TXD1	Out	MIDI signal output
	5	RXD1	In	MIDI signal input
	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	30 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, 48	FI8, SI8	—	Not used
	49	FI9	In	Terminal for button input signal
	50	SI9	In	Data bus for LCD driver
	51	FI10	In	Terminal for button input signal
	52	SI10/P23	Out	Data bus for the LCD driver
	53 ~ 55	KI0 ~ KI2	In	Terminal for button input signal
	56	MWNB	Out	Write enable signal for the DSP

— 7 —

	Pin No.	Terminal	In/Out	Function
	57 ~ 76	MA0 ~ MA19	Out	Address bus
	77, 78	MCSB0, MCSB1	Out	Chip enable signal output for the sound source ROM,
				working RAM and DSP
	79	MCSB2	Out	Not used
	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 and GA.

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 GA
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 for working strage RAM
31	VDD3	In	+5 V source
32	CE2	In	Chip enable signal input. High active.
33	AD0	In	Address bus

— 8 —

	Pin No.	Terminal	In/Out	Function
	34	CE1B	In	Chip enable signal input. Low active.
	35 ~ 41, 43	EIO0 ~ EIO7	In/Out	Data bus for the effect RAM
	42 , 44, 46 ~ 48,	EA0 ~ EA14	Out	Address bus for the effect RAM
	51 ~ 59, 61
	45	ECEB	Out	Chip enable signal output for the effect RAM
	49	EOEB	Out	Output enable signal for the effect RAM
	50	VSS3	In	Ground (0 V) source
	60	BWEB	Out	Write enable signal output for the effect RAM
	62, 66, 70, 74, 78	VSS2	In	Ground source
	63, 67, 71, 75, 79	VDD2	In	+5 V source
	64, 65	PA0, PA1	Out	Button scan signal output
	68, 69, 77	PA2, PA3, PA7	—	Not used
	72	PA4	Out	Data/command signal for LCD driver
	73	PA5	Out	Read/write signal for LCD driver
	76	PA6	Out	Chip enable signal for LCD driver

LCD DRIVER (LSI401: SED1278F0A)

The LCD driver can drive a dot matrix LCD having 40 segment and 15 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 LSI 401.

	Pin No.	Terminal	In/Out	Function
	1 ~ 22,	SEG1 ~ SEG40	Out	Segment signal output
	63 ~ 80
	23	VSS	—	GND (0 V) source
	24, 25	OSC1, OSC2	In/Out	Terminals for the built-in clock pulse generator.The external
				resistor connected determines the oscillation requency.
				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
	36	RS	In	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 ~ 53,	COM1 ~ COM7	Out	Common signal/output
	55 ~ 62	COM9 ~ COM16
	54	COM8	—	Not used

— 9 —