CASIO ML1 Service Manual
ML-1
(with price)
ELECTRONIC KEYBOARD
ML-1
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
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
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 Ω 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.
— 1 —
BLOCK DIAGRAM
Amplifier
AN8053N
IC1
Speaker
VDD 5.6V AVDD 5.6V
Power Supply Circuit
T1, D4
CPU
MSM6521-10
LSI1
Oscillator
XL1
LX0~LX3
LY2~LY7
KO0~KO2
KO4~KO7
KI0~KI7
Illuminated Keyboard
LEDs
Switches
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
— 2 —
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
KO4
KO5 Tone 1
KO6 Tone 2 Tone 3 Tone 4 Tone 5
KO7
Melody
Guide
Any Key
Play
Volume
Down
Rhythm
Stop
Demo Play
Volume
Up
Tempo
Down
Rhythm
Select
Keyboard LED Matrix
LY0 LY1 LY2 LY3 LY4 LY5 LY6 LY7
LX0 E5 A4 C4 F3
LX1 G4 D4 B3
Tempo
Up
LX2 D5 B4 G3
LX3 C5 F4 E4 A3
— 3 —
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