Casio Magical Light ML-1 User manual

ELECTRONIC KEYBOARD
(with price)
ML-1
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
— 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 Ωload): 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.

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 —

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 —

CPU (LSI1: MSM6521-10)
Containing a sound data ROM and a DAC (Digital to Analog Converter), the CPU provides sound waveform
in accordance with the pressed key and selected tone. The CPU also drives LEDs in the illuminated keyboard
directly. The following table shows the pin functions of LSI1.
R3 R4
R5
R17
D1
ON
OFF
Power Switch
DC +7.5 V
Input
GND DGGND AG
T1
2SD1858Q,R
D4
MTZJ6.8A
C5
R2
R6
C3 C4 D3
VDD +5.6V
AVDD +5.6V
Power Supply Circuit
The power supply circuit regulates a constant output voltage +5.6V by T1 and D4.
Pin No. Terminal In/Out Function
1 LY1 Out Not used.
2 ~ 7 LY2 ~ LY7 Out Keyboard LED drive signal output
8 LVDD1 In +5V source for the built-in LED driver
9 LGND2 In Ground (0V) source for the built-in LED driver
10 ~ 13 LX0 ~ LX3 Out Keyboard LED drive signal output
14 ~ 17 LX4 ~ LX7 Out Not used.
18 LVDD2 In +5V source for the built-in LED driver
19 GND2 In Ground (0V) source
20, 21 COSI, COSO In/Out 21.725 MHz clock pulse input/output
22 VDD In +5V source
23 GND1 In Ground (0V) source
24 ~ 26 TEST1 ~ TEST3 In Not used. Connected to ground.
27 RESET In Reset signal input. Power OFF: 0V, Power ON: +5V
28 AVDD In +5V source for the built-in DAC
29 OUT Out Sound waveform output
30 AGND In Ground (0V) source for the built-in DAC
31 ~ 38 KI0 ~ KI7 In Input terminal for keys and switches
39 ~ 41 KO0 ~ KO2 Out Key and switch scan signal input
42 KO3 Out Not used.
43 ~ 46 KO4 ~ KO7 Out Key and switch scan signal input
47 ~ 58 Not used.
59 LGND1 In Ground (0V) source for the built-in LED driver
60 LY0 In Not used.
— 4 —

— 5 —
IC LEAD IDENTIFICATION
LY1 LY2 LY3 LY4 LY5 LY6 LY7 LVDD1 LGND2 LX0 LX1 LX2 LX3 LX4 LX5 LX6
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16
30
29
28
27
26
25
24
23
22
21
20
29
28
17
AGND
OUT
AVDD
RESET
TEST3
TEST2
TEST1
GND1
VDD
COSO
COSI
GND2
LVDD2
LX7
KO7 KO6 KO5 KO4 KO3 KO2 KO1 KO0
KI7 KI6 KI5 KI4 KI3 KI2 KI1 KI0
46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31
47
48
49
50
51
52
53
54
55
56
57
58
59
60
KO8
KO9
KO10
KO11
D4
D3
D2
D1
OP
Ø2
Ø1
CE
GND1
LY0
IC1: AN8053N
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
SPO NC SPG PC-1 PC-2 SPI SPM VREF
VCC
NC
CONT
VREG
NC NC NC
PR GND
LSI1: MSM6521-10
T1: 2SD1858Q, R T2: 2SC1740SQ
TROUBLESHOOTING
Nature of Trouble Faulty Block Checkpoint
No power Power Supply Circuit Base of T1 should receive +6 V.
Emitter of T1 should provide +5.6 V.
Power switch Switch contact.
Power Jack (J1) Jack contact.
No sound at all Power Amp.
(IC1: AN8053N) Pin 16 should receive +7.5 V when the power switch is turned on.
Voltage at pin 14 should drop at 0V
when the power switch is turned on.
Check output signal of pin 1.
CPU (LSI1: MSM6521-10) Voltage at pin 27 should rise 0V to 5.6V
when the power switch is turned on.
Pins 39 ~ 41 and 43 ~ 46 should provide
pulses.
Pin 29 should have a sound signal when
a key is pressed.
Oscillator (XL1) Pins 20 and 21 of the CPU should
receive an ocsillation signal.
Keyboard LEDs don't
light up Keyboard LED
Keyboard LED Matrix Open circuir on LX or LY line.
A certain key or switch
does not function Key and Switch Matrix Dust on the contact.
Certain keys or switches
do not function Key and Switch Matrix Open circuit on KC or KI line.

— 6 —
PCB VIEW AND MAJOR WAVEFORMS
Key A3 ON
Key A3 OFF (5.6V)
1Key scan signal KO7
MSM6521-10 pin 46 2Sound signal output MSM6521-10 pin 29
3Power amp output
AN8053N pin 1
4LED drive signal LY6
JA connector pin 5
5LED drive signal LX3
JA connector pin 10
Key: A3
Tone: Flute (No.21)
Volume: Maximum
1
2
3
4
5
321
54

— 7 —
MIHGFEDCBA J K L N OP
MIHGFEDCBA JKL NOP
1
2
3
4
5
6
7
8
9
10
1
2
3
4
5
6
7
8
9
10
SCHEMATIC DIAGRAM
JCM604-MA1M/MA2M/MA3M
0.0
0.0
0.7
6.5
6.7 5.8
3
1
45
2

— 8 —
EXPLODED VIEW
1
9
10
3
2
13
5 6 4 7 8
11
12