Casio Magical Light ML-1 User manual

ELECTRONIC KEYBOARD

(with price)

ML-1

CONTENTS

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

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

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

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

IC and Transistor Lead Identification . . . . . . . . . . . . . . . . . . . . . . 5

PCB View and Major Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Exploded View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Parts List . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

SPECIFICATIONS

General

Number of Keys: 24

Illuminated keys: White 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: 6.5 cm dia. 0.5 W Input Rating: 1 pce.

Terminal: AC Adapter Jack (DC 7.5 V)

Power Source: DC: 5 AA size dry batteries

Battery life: Approx. 7 hours (SUM-3/R6P)

AC: AC adapter AD-1

Power ON Reminder*: 3 minutes after the last operation

Power Consumption: 1.1 W

Dimensions: 36 x 326 x 137 mm (HWD)

(1-3/8 x 12-7/8 x 5-3/8 inches) (HWD)

Weight: 0.55 kg (1.2 lbs) including batteries

— 1 —

Electrical

Current Drain with 7.5 V DC:

No Sound Output 45 mA ±20%

Maximum Volume 135 mA ±20%

with keys D3 and E4 pressed in Flute tone

Volume: Maximum, Rhythm: Pops,

Tempo: Maximum

Speaker Input Level (Vrms with 8 Ωload): 680 mV ±20%

with key E4 pressed in Flute tone

Volume: Maximum

Minimum Operating Voltage: 6.2 V

*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.

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

F3 G3 A3 B3 C4 D4 E4 F4 G4 A4 B4 C5 D5 E5

KO0~KO2

KO4~KO7

KI0~KI7

Illuminated Keyboard

Switches

Oscillator

XL1

Amplifier

AN8053N

IC1

Speaker

CPU

MSM6521-10

LSI1

LEDs

LX0~LX3

LY2~LY7

Power Supply Circuit

T1, D4

VDD 5.6V AVDD 5.6V

— 2 —

CIRCUIT DESCRIPTION

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

KO4 Volume

Down Volume

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

Key Matrix

LY0 LY1 LY2 LY3 LY4 LY5 LY6 LY7

LX0 E5 A4 C4 F3

LX1 G4 D4 B3

LX2 D5 B4 G3

LX3 C5 F4 E4 A3

Keyboard LED Matrix

— 3 —

CPU (LSI1: MSM6521-10)

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.

R3 R4

R17

OFF

Power Switch

DC +7.5 V

Input

GND DGGND AG

2SD1858Q,R

MTZJ6.8A

C4 D3

VDD +5.6V

AVDD +5.6V

Power Supply Circuit

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

Pin No. Terminal In/Out Function

1 LY1 Out Not used.

2 ~ 7 LY2 ~ LY7 Out Keyboard LED drive signal output

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

9 LGND2 In Ground (0V) 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 +5V source for the built-in LED driver

19 GND2 In Ground (0V) source

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

22 VDD In +5V source

23 GND1 In Ground (0V) source

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

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

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

29 OUT Out Sound waveform output

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

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

39 ~ 41 KO0 ~ KO2 Out Key and switch scan signal input

42 KO3 Out Not used.

43 ~ 46 KO4 ~ KO7 Out Key and switch scan signal input

47 ~ 58 Not used.

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

60 LY0 In Not used.

— 4 —

— 5 —

IC LEAD IDENTIFICATION

LY1

LY2

LY3

LY4

LY5

LY6

LY7

LVDD1

LGND2

LX0

LX1

LX2

LX3

LX4

LX5

LX6

AGND

OUT

AVDD

RESET

TEST3

TEST2

TEST1

GND1

VDD

COSO

COSI

GND2

LVDD2

LX7

KO7

KO6

KO5

KO4

KO3

KO2

KO1

KO0

KI7

KI6

KI5

KI4

KI3

KI2

KI1

KI0

KO8

KO9

KO10

KO11

Ø2

Ø1

GND1

LY0

IC1: AN8053N

SPO

SPG

PC-1

PC-2

SPI

SPM

VREF

VCC

CONT

VREG

PR GND

LSI1: MSM6521-10

T1: 2SD1858Q, R T2: 2SC1740SQ

TROUBLESHOOTING

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 0V

when the power switch is turned on.

Check output signal of pin 1.

CPU (LSI1: MSM6521-10) Voltage at pin 27 should rise 0V to 5.6V

when the power switch is turned on.

Pins 39 ~ 41 and 43 ~ 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 circuir 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.

— 6 —

PCB VIEW AND MAJOR WAVEFORMS

Key A3 ON

Key A3 OFF (5.6V)

1Key scan signal KO7

MSM6521-10 pin 46 2Sound signal output

MSM6521-10 pin 29

3Power amp output

AN8053N pin 1

4LED drive signal LY6

JA connector pin 5

5LED drive signal LX3

JA connector pin 10

Key: A3

Tone: Flute (No.21)

Volume: Maximum

321

— 7 —

MIHGFEDCBA J K L N OP

MIHGFEDCBA JKL NOP

SCHEMATIC DIAGRAM

JCM604-MA1M/MA2M/MA3M

0.0

0.7

6.5

6.7 5.8

— 8 —

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