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ELECTRONIC KEYBOARD
(with price)
ML-1
ML-1


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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


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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
load):
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.


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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 --


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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
Up
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
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 --