Casio ML-3 User manual

ELECTRONIC KEYBOARD

ML-3

SONG BANK25 TONES

TEMPO TONE

RHYTHM

SEL.

1234

VOLUME

MELODY GUIDE

PLAY

DEMO

ANY-KEY PLAY

MODE

LIGHT ON/OFF

POPS WALTZ

ROCK 8 BEAT 16 BEAT DISCO SLOW ROCK FUNK SWING BOSSA NOVA SAMBA MARCH

RHYTHM

SONG

2 3 4 5 678910

POWER OFF

11 PIANO

12 ELEC PIANO

13 PIPE ORGAN

14 JAZZ ORGAN

15 ACCORDION

21 FLUTE

22 CLARINET

23 TRUMPET

24 HARMONICA



25 VIOLIN

31 BRASS ENS

32 SYNTH-BRASS

33 STRINGS

34 SYNTH-STRINGS

35 CHORUS

41 ELEC GUITAR

42 JAZZ GUITAR

43 VIBRAPHONE



44 CHURCH BELLS

45 BELLS

51 SYNTH-REED

52 WAW VOICE

53 METAL LEAD

54 ROCK DRUM

55 S.E.

1 FRÈRE JACQUES

2 JOY TO THE WORLD

3 OLD MacDONALD HAD A FARM

4 TWINKLE TWINKLE LITTLE STAR

5 MINUET(J.S.BACH )

6 LONDON BRIDGE

7 MICHAEL

8 MARY HAD A LITTLE LAMB

9 THE CAMPTOWN RACES

10 ODE TO JOY

STOP

CONTENTS

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

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

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

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Schematic Diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

PCB View and Major Waveforms. . . . . . . . . . . . . . . . . . . . . . . . . 9

Exploded View. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

— 1 —

*Power ON Reminder

Power ON reminder is sudden audible and light signals, a short melody at maximum volume and lighting

up the illuminated keyboard for a few seconds.

Power ON reminder functions three minutes after the last operation, and it repeats every three minutes until

turning the switch off or restarting operations.

SPECIFICATIONS

General

Number of Keys: 32

Illuminated Keys: White and Black keys

Polyphonic: 2-note

Preset Tones: 25

Auto-Rhythms: 12

Demonstration Tunes: 10

Lesson Functions: 3 modes; Demo, Any-Key Play, Melody Guide

Built-In Speaker: 8.0 cm dia. 1.0 W Input Rating: 1 pce.

Terminals: Mic. Jack [Input Impedance: 20 kΩ

AC Adapter Jack (DC 7.5 V)

Power Source: DC: 5 AA size dry batteries

Battery life: Approx. 4 hours (SUM-3/R6P)

AC: AC adapter AD-1

Power ON Reminder*: 3 minutes after the last operation

Power Consumption: 1.5 W

Dimensions: 57 ×412 ×208 mm (HWD)

(2-1/4 ×16-3/8 ×8-1/4 inches) (HWD)

Weight: 0.95 kg (2.1 lbs) excluding batteries

Electrical

Current Drain with 7.5 V DC:

No Sound Output 44 mA ±20%

Maximum Volume 280 mA ±20%

with keys B3 and C4 pressed in Flute tone

Volume: Maximum, Rhythm: Rock,

Tempo: Maximum, Mic. input: 29 mV

Speaker Input Level (Vrms with 4 Ωload): 740 mV ±20%

with key C4 pressed in Flute tone

Volume: Maximum

Minimum Operating Voltage: 6.2 V

— 2 —

KO0~KO11

KI0~KI7

Illuminated Keyboard

Switches

Oscillator

XL1

Amplifier

AN8053N

IC1

Mic. amp.

T4, T5

Speaker

CPU

MSM6521-13

LSI1

LEDs

LX0~LX3

LY0~LY7

Power Supply Circuit

T1, D3

VDD 5.6V AVDD 5.6V

Filter

Mic. input

BLOCK DIAGRAM

Nomenclature of Keys

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

F3 G3 A3 B3 C4 D4 E4 F4 G4 A4 B4 C5 D5 E5 F5 G5 A5 B5 C6

— 3 —

LY0 LY1 LY2 LY3 LY4 LY5 LY6 LY7

LX0 C6 F5 E5 A4 G#4 C#4 C4 F3

LX1 B5 F#5 D#5 A#4 G4 D4 B3 F#3

LX2 A#5 G5 D5 B4 F#4 D#4 A#3 G3

LX3 A5 G#5 C#5 C5 F4 E4 A3 G#3

KI0 KI1 KI2 KI3 KI4 KI5 KI6 KI7

KO0 F3 F#3 G3 G#3 A3 A#3 B3 C4

KO1 C#4 D4 D#4 E4 F4 F#4 G4 G#4

KO2 A4 A#4 B4 C5 C#5 D5 D#5 E5

KO3 F5 F#5 G5 G#5 A5 A#5 B5 C6

KO4 Volume

Down Volume

Up Light

On/Off

KO5 Tone 1 Rhythm

Stop Tempo

Down

KO6 Tone 2 Tone 3 Tone 4 Tone 5 Rhythm

Select Tempo

KO7 Melody

Guide Any Key

Play Demo Play

CIRCUIT DESCRIPTION

Key Matrix

Keyboard LED Matrix

— 4 —

AVDD

AG AG AG

C11

C12

2SC1740SQ

R11

C10

R12 R13 R14

Pin No. Terminal In/Out Function

1 ~ 7 LY1 ~ LY7 Out Keyboard LED drive signal output

8 LVDD1 In +5 V source for the built-in LED driver

9 LGND2 In Ground (0 V) source for the built-in LED driver

10 ~ 13 LX0 ~ LX3 Out Keyboard LED drive signal output

14 ~ 17 LX4 ~ LX7 Out Not used.

18 LVDD2 In +5 V source for the built-in LED driver

19 GND2 In Ground (0 V) source

20, 21 COSI, COSO In/Out 21.725 MHz clock pulse input/output

22 VDD In +5 V source

23 GND1 In Ground (0 V) source

24 ~ 26 TEST1 ~ TEST3 In Not used. Connected to ground.

27 RESET In Reset signal input. Power OFF: 0 V, Power ON: +5 V

28 AVDD In +5 V source for the built-in DAC

29 OUT Out Sound waveform output

30 AGND In Ground (0 V) source for the built-in DAC

31 ~ 38 KI0 ~ KI7 In Input terminal for keys and switches

39 ~ 46 KO0 ~ KO7 Out Key and switch scan signal input

47 ~ 58 — — Not used.

59 LGND1 In Ground (0 V) source for the built-in LED driver

60 LY0 In Keyboard LED drive signal output

Filter Block

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

CPU (LSI1: MSM6521-13)

Containing a sound data ROM and a DAC (Digital to Analog Converter), the CPU provides sound waveform

in accordance with the pressed key and selected tone. The CPU also drives LEDs in the illuminated keyboard

directly. The following table shows the pin functions of LSI1.

— 5 —

Nature of Trouble Faulty Block Checkpoint

No power Power Supply Circuit Base of T1 should receive +6 V.

Emitter of T1 should provide +5.6 V.

Power switch Switch contact.

Power Jack (J1) Jack contact.

No sound at all Power Amp.

(IC1: AN8053N) Pin 16 should receive +7.5 V when the

power switch is turned on.

Voltage at pin 14 should drop at 0 V

when the power switch is turned on.

Check output signal of pin 1.

CPU (LSI1: MSM6521-13) Voltage at pin 27 should rise 0 V to 5.6

V when the power switch is turned on.

Pins 39 ~ 46 should provide pulses.

Pin 29 should have a sound signal when

a key is pressed.

Oscillator (XL1) Pins 20 and 21 of the CPU should

receive an ocsillation signal.

Keyboard LEDs don't

light up Keyboard LED

Keyboard LED Matrix Open circuit on LX or LY line.

A certain key or switch

does not function Key and Switch Matrix Dust on the contact.

Certain keys or switches

do not function Key and Switch Matrix Open circuit on KC or KI line.

R3 R4

OFF

Power Switch

DC +7.5 V

Input

GND DGGND AG

2SD1858Q,R

MTZJ6.8A

VDD +5.6V

AVDD +5.6V

Power Supply Circuit

The power supply circuit regulates a constant output voltage +5.6V by T1 and D4.

TROUBLESHOOTING

— 6 —

SCHEMATIC DIAGRAMS

JCM605-KY1M

— 7 —

JCM605-LD2MJCM605-LD1M

— 8 —

JCM607-MA1M/MA2M

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