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
Up
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
AG
Amplifier/Voltage Regulator
(IC101: AN8053N)
The right figure shows the internal block of IC101.
R2106
C108
C107
AG
VCC NC CONT
16
15
POWER
R107
14 13
C109
AG
5V
VREG
5V REG
R108
From CPU
NCNC NC PRE GND
12 11
10
9
-
SP AMP
+
1
SPO NC SP GND PC-1 PC-2 SPI SPM VREF
4
32
6
5
— 4 —
7
VREF
8
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