CASIO ML1 Service Manual
(with price)
ML-1
ML-1
ELECTRONIC KEYBOARD
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 |
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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 |
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Battery life: Approx. 7 hours (SUM-3/R6P) |
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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) |
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(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: |
45 mA ± 20% |
No Sound Output |
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Maximum Volume |
135 mA ± 20% |
with keys D3 and E4 pressed in Flute tone |
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Volume: Maximum, Rhythm: Pops, |
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Tempo: Maximum |
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Speaker Input Level (Vrms with 8 Ω load): |
680 mV ± 20% |
with key E4 pressed in Flute tone |
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Volume: Maximum |
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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
Nomenclature of Keys
LX0~LX3 |
Illuminated Keyboard |
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LY2~LY7 |
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LEDs |
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KO0~KO2 |
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KO4~KO7 |
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CPU
MSM6521-10
LSI1
KI0~KI7
Oscillator |
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XL1 |
Switches |
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F#3 G#3 A#3 |
C#4 D#4 |
F#4 G#4 A#4 |
C#5 D#5 |
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F3 |
G3 |
A3 |
B3 |
C4 |
D4 |
E4 |
F4 |
G4 |
A4 |
B4 |
C5 |
D5 |
E5 |
— 2 —
CIRCUIT DESCRIPTION
Key Matrix
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KI0 |
KI1 |
KI2 |
KI3 |
KI4 |
KI5 |
KI6 |
KI7 |
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KO0 |
F3 |
F#3 |
G3 |
G#3 |
A3 |
A#3 |
B3 |
C4 |
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KO1 |
C#4 |
D4 |
D#4 |
E4 |
F4 |
F#4 |
G4 |
G#4 |
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KO2 |
A4 |
A#4 |
B4 |
C5 |
C#5 |
D5 |
D#5 |
E5 |
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KO3 |
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KO4 |
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Volume |
Volume |
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Down |
Up |
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KO5 |
Tone 1 |
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Rhythm |
Tempo |
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Stop |
Down |
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KO6 |
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Tone 2 |
Tone 3 |
Tone 4 |
Tone 5 |
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Rhythm |
Tempo |
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Select |
Up |
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KO7 |
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Melody |
Any Key |
Demo |
Play |
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Guide |
Play |
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Keyboard LED Matrix
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LY0 |
LY1 |
LY2 |
LY3 |
LY4 |
LY5 |
LY6 |
LY7 |
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LX0 |
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E5 |
A4 |
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C4 |
F3 |
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LX1 |
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G4 |
D4 |
B3 |
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LX2 |
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D5 |
B4 |
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G3 |
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LX3 |
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C5 |
F4 |
E4 |
A3 |
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— 3 —
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