Casio M-300 User Manual

M-300

INDEX

(with price)

M-300

ELECTRIONIC KEYBOARD

CONTENTS

Specification ....................................................................2

Block Diagram .................................................................3

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

PCB View and Major Waveforms ....................................5

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

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

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

SPECIFICATIONS

General

Number of Keys: 32 Polyphonic: 4-note Preset Tones: 8 Preset Effects: 6 Preset Phrases: 4 Demonstration Tunes: 6 Function Dial: Magical sound dial Built-In Speaker: 8 cm dia. 1.0 W Input Rating: 1 pce. Power Source: 5 AA size dry batteries

Battery life: approx. 6 hours (SUM-3/R6P) Power Consumption: 1.5 W Dimensions (HWD): 58 x 439 x 205 mm

(2-1/4 x 17-1/4 x 8-1/16 inches)

Weight: 0.99 kg (2.2 lbs) including batteries

Electrical

Current Drain with 7.5 V DC:

NoSound Output 33 mA +/-20% Maximum Volume 170 mA +/-20%

with keys G3, A3, B3 and C4 pressed in Street Organ tone, Volume; Maximum

Speaker output level at 4 Ω load: 640 mV +/-20%

with key C4 pressed in Street Organ tone Volume; Maximum

Minimum Operating Voltage: 5.0 V

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

— 2 —

Speaker

Amplifier

AN8053N

IC101

BLOCK DIAGRAM

CPU

Filter Q101

VDD

MSM6387-22

LSI101

KO0 ~ KO8

KI0 ~ KI7

AVDD

Oscillator

Q102, X101

Keyboard

Buttons

CIRCUIT DESCRIPTION

Key Matrix

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 Music box Glass harp Piano Trumpet Flute Violin Woodbass

KO5 Train Car Quiz Cheer Animal

Volume

Down

Volume

KO6 Stop Siren Horror Carnival Rap

Street organ

Country western

KO7 Dial SW-A Dial SW-B Dial WS-C

KO8 Song 1 Song 2 Song 3 Song 4 Song 5 Song 6

Song 1: Twinkle Twinkle Little Stars Song 4: Old MacDONALD Had a Farm Song 2: Pop Goes the Weasel Song 5: Clap Your hands Song 3: Lullaby (Brahms) Song 6: O Christmas Tree

— 3 —

CPU (LSI101: MSM6387-22)

Containing a sound data ROM and a DAC (Digital to Analog Convertor), the CPU provides sound waveform in accodance with the pressed key and the selected tone. The following table shows the pin functions of LSI101.

Pin No. Terminal In/ Out Function

1, 2 TEST1, TEST2 Not used. Connected to ground.

3 RESET In Power ON reset terminal. On: +5 V Off: 0 V 4 AVDD In +5 V sorce for the built-in DAC 5 OUT Out Sound waveform output 6 AGND In Ground (0 V) source for the built-in DAC 7 GND In Ground (0 V) source 8 COSI In 21.725 MHz clock pulse input 9 COSO Not used

10 VDD In +5 V source

11 ~ 18 KI0 ~ KI7 In Input terminals from keys and switches

19, 20 KO11, KO10 Not used

21 ~ 30 KO9 ~ KO0 Out Key and switch scan signal outputs

Filter Block

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

AVDD

Q101 2SC1740SQ

C106

To power amp

R105

R104

Amplifier/Voltage Regulator (IC101: AN8053N)

The right figure shows the internal block of IC101.

R2106

C108

C107

VCC NC CONT

POWER

R107

14 13

C109

VREG

5V REG

R108

From CPU

NCNC NC PRE GND

12 11

SP AMP

SPO NC SP GND PC-1 PC-2 SPI SPM VREF

— 4 —

VREF

+ 8 hidden pages