CASIO ML3 Service Manual
ML-3
POPS
ROCK
1
2 3 4 5
8 BEAT
16 BEAT
MODE
POWER OFF
DISCO
11 PIANO
12 ELEC PIANO
13 PIPE ORGAN
14 JAZZ ORGAN
15 ACCORDION
21 FLUTE
22 CLARINET
23 TRUMPET
24 HARMONICA
ANY-KEY PLAY
PLAY
SLOW ROCK
6
DEMO
MELODY GUIDE
25 VIOLIN
31 BRASS ENS
32 SYNTH-BRASS
33 STRINGS
34 SYNTH-STRINGS
35 CHORUS
41 ELEC GUITAR
42 JAZZ GUITAR
43 VIBRAPHONE
FUNK
7
SWING
8
44 CHURCH BELLS
45 BELLS
51 SYNTH-REED
52 WAW VOICE
53 METAL LEAD
54 ROCK DRUM
55 S.E.
VOLUME
BOSSA NOVA
9
ELECTRONIC KEYBOARD
SONG BANK25 TONES
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
TEMPO
SAMBA
10
MARCH
RHYTHM
SEL.
WALTZ
STOP
34
2
1
TONE
5
LIGHT ON/OFF
RHYTHM
SONG
1
10
ML-3
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
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 kΩ
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 Ω load): 740 mV ± 20%
with key C4 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 —
Mic. input
BLOCK DIAGRAM
Mic. amp.
T4, T5
CPU
LX0~LX3
LY0~LY7
KO0~KO11
Illuminated Keyboard
LEDs
Amplifier
AN8053N
IC1
Speaker
VDD 5.6V
Power Supply Circuit
AVDD 5.6V
T1, D3
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
Filter
T3
MSM6521-13
LSI1
Oscillator
XL1
KI0~KI7
Switches
F3 G3 A3 B3 C4 D4 E4 F4 G4 A4 B4 C5 D5 E5 F5 G5 A5 B5 C6
— 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 F5 F#5 G5 G#5 A5 A#5 B5 C6
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 C6 F5 E5 A4 G#4 C#4 C4 F3
LX1 B5 F#5 D#5 A#4 G4 D4 B3 F#3
Light
On/Off
Tempo
Up
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
— 3 —
Loading...