ELECTRIONIC KEYBOARD
M-300
M-300
(without price)
INDEX
-- 2 --
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
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
-- 3 --
BLOCK DIAGRAM
CPU
MSM6387-22
LSI101
Amplifier
AN8053N
IC101
Speaker
Oscillator
Q102, X101
VDD
Keyboard
Buttons
Filter
Q101
KO0 ~ KO8
KI0 ~
KI7
AVDD
CIRCUIT DESCRIPTION
Key Matrix
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
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
KO6
Stop
Siren
Horror
Carnival
Rap
KO7
Dial SW-A
Dial SW-B Dial WS-C
KO8
Song 1
Song 2
Song 3
Song 4
Song 5
Song 6
Street
organ
Volume
Down
Volume
Up
Country
western
-- 4 --
CPU (LSI101: MSM6387-22)
Containing a sound data ROM and a DAC (Digital to Analog Convertor), the CPU provides sound wave-
form in accodance with the pressed key and the selected tone.
The following table shows the pin functions of LSI101.
Amplifier/Voltage Regulator
(IC101: AN8053N)
The right figure shows the internal block of IC101.
AVDD
C108
Q101
2SC1740SQ
C107
AG
R107
R2106
C106
C109
AG
R105
AG
R104
R108
To power amp
From CPU
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
SP AMP
VREF
5V REG
POWER
SPO
NC
SP GND PC-1
PC-2
SPI
SPM
VREF
VCC
NC
CONT
5V
VREG
NC
NC
NC PRE GND
+
-
Filter Block
Since the sound signal from the CPU is a stepped waveform, the filter block is added to smooth the
waveform.
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
-- 5 --
13
JA
1
JCM547-MA1M A
MC101
R125
R126
R127
R115
R114
R113
R112
R111
R123
R119
R118
R117
R116
R120
R121
R122
R124
75
75
75
75
5
C114
R128
X101
R129
C115
Q102
C117
C116
B
E
5
5
LSI101
C111
R130
C110
5
5
R108
C109
R107
C108
R106
Q101
R110
D104
75
75
75
75
E
B
PZ-R
C107
C105
R104
C104
C102
125
D102
J101
L101
R101
D101
R105
C106
IC101
75
PS-Q
PS-BL
LED101
L102
C103
No.
R102
328
75
PZ-BK
75
D105
195
13
D112
D111
D110
D109
D108
No. 3
D107
D106
D105
1
JA
JCM547-MA1MA
PCB VIEW AND MAJOR WAVEFORMS
Tone:
Flute
Key:
A4
Volume: Maximum
~
~
~
~
~
1
Clock pulse COSI
MSM6387-22 pin 9
2
Key scan signal KO0
MSM6387-22 pin 30
3
Key scan signal KO1
MSM6387-22 pin 29
6
Power amp input
AN8053N pin 6
7
Power amp output
AN8053N pin 1
4
Sound signal output
MSM6387-22 pin 5
5
Filter output
Emitter of Q101
CH1
A 50ns
CH1 1V
1
Px10
A 2ms
CH1
CH2
CH1 5V CH2 5V
2
3
Px10
Px10
4
5
CH1 . 1V CH2 . 1V
CH1
CH2
A 2ms
Px10
Px10
6
7
CH1 . 1V CH2 . 5V
CH1
A 2ms
Px10
Px10
1
4
5
3
2
6
7