ELECTRONIC KEYBOARD
ML-3
ML-3
SONG BANK
25 TONES
TEMPO
TONE
RHYTHM
SEL.
1
2
34
VOLUME
MELODY GUIDE
PLAY
DEMO
ANY-KEY PLAY
MODE
5
LIGHT ON/OFF
1
POPS
WALTZ
ROCK
8 BEAT
16 BEAT
DISCO
SLOW ROCK
FUNK
SWING BOSSA NOVA
SAMBA
MARCH
RHYTHM
SONG
2
3
4
5
6
7
8
9
10
1
10
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 k
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
load):
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
T3
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
Up
KO7
Melody
Guide
Any Key
Play
Demo
Play
CIRCUIT DESCRIPTION
Key Matrix
Keyboard LED Matrix