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 —
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.
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.
Power Supply Circuit
The power supply circuit regulates a constant output voltage +5.6V by T1 and D4.
T1
2SD1858Q,R
R17
D4
MTZJ6.8A
— 4 —
C5
R2
R5
R3 R4
R6
C3
DGGND
DC +7.5 V
Input
D1
Power Switch
ON
OFF
GND
VDD +5.6V
AVDD +5.6V
C4 D3
AG
LY1
LY2
LY3
LY4
LY5
LY6
LY7
LVDD1
LGND2
LX0
LX1
LX2
LX3
LX4
LX5
LX6
123456789
10111213141516
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
464544434241403938373635343332
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
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
SPONCSPG
PC-1
PC-2
SPI
SPM
VREF
VCC
NC
CONT
VREG
NC
NC
NC
PR GND
TROUBLESHOOTING
IC LEAD IDENTIFICATION
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
A certain key or switch
Keyboard LED
Keyboard LED Matrix Open circuir on LX or LY line.
Key and Switch Matrix Dust on the contact.
does not function
Certain keys or switches
Key and Switch Matrix Open circuit on KC or KI line.
do not function
LSI1: MSM6521-10
IC1: AN8053N
T2: 2SC1740SQ
T1: 2SD1858Q, R
— 5 —
PCB VIEW AND MAJOR WAVEFORMS
321
1
1 Key scan signal KO7
MSM6521-10 pin 46
5
2
3
2 Sound signal output
MSM6521-10 pin 29
3 Power amp output
AN8053N pin 1
4
Key: A3
Tone: Flute (No.21)
Volume: Maximum
4
Key A3 OFF (5.6V)
5
Key A3 ON
4 LED drive signal LY6
JA connector pin 5
5 LED drive signal LX3
JA connector pin 10
— 6 —
JCM604-MA1M/MA2M/MA3M
SCHEMATIC DIAGRAM
MIHGFEDCBA J K L N OP
1
2
3
4
5
6.7
1
2
5.8
6.5
3
4
3
5
6
7
8
9
0.7
0.0
0.0
2
6
4
5
7
1
8
9
10
10
MIHGFEDCBA JKL NOP
— 7 —
EXPLODED VIEW
9
5
6
4
7
8
11
10
3
1
2
12
— 8 —
13
PARTS LIST
ML-1
Notes: 1. Prices and specifications are subject to change with-
out prior notice.
2. As for spare parts order and supply, refer to the
"GUIDEBOOK for Spare parts Supply", published
seperately.
3. The numbers in item column correspond to the same
numbers in drawing.
FOB Japan
N Item Code No. Parts Name Specification Q M N.R.Yen R *
Unit Price
Electrical Parts
N LSI1 2011 7504 LSI MSM6521-10 1 1 730 A H
IC1 2114 3269 IC AN8053N 1 1 120 A B
T1 2253 0448 Transistor 2SD1858Q,R-TV6-T 1 1 24 A A
T2 2220 1387 Transistor 2SC1740SQ-TP-T 1 10 13 B A
D1 2390 0371 Diode DSK10B-BT-T 1 10 11 B A
D2 2390 1323 Diode RB100A-T32-T 1 10 29 C A
D3, 6 2390 1344 Diode 1SS133T-77-T 2 10 3 C A
D4 2360 1519 Zener diode MTZJ6.8A-T77-T 1 10 8 A A
LED1~14 2370 1036 LED EBR3371X-J174K 14 10 25 B A
XL1 2590 0742 Ceramic oscillator EFO-GC2175C3 1 1 64 B B
R2~4 2606 1722 Carbon film resistor R-20-2.2-J-T23-T 3 20 2 C A
R5/6 2606 1477 Carbon film resistor R-20-33-J-T23-T 2 20 2 C A
R8 2606 1253 Carbon film resistor R-20-4.7K-J-T23-T 1 20 2 C A
R9 2606 1239 Carbon film resistor R-20-8.2K-J-T23-T 1 20 2 C A
R10/11 2606 1274 Carbon film resistor R-20-1.5K-J-T23-T 2 20 2 C A
R12~15 2606 1708 Carbon film resistor R-20-47-J-T23-T 4 20 2 C A
R16 2606 1162 Carbon film resistor R-20-10-J-T23-T 1 20 2 C A
R17 2606 1309 Carbon film resistor R-20-470-J-T23-T 1 20 2 C A
C2 2807 0985 Electrolytic capacitor 16RE2-220-T2-T 1 10 30 C A
C3 2801 9611 Electrolytic capacitor 6.3RC2-100-T2-T 1 10 17 C A
C4 2801 9618 Electrolytic capacitor 6.3RC2-220-T2-T 1 10 26 C A
C5 2805 3142 Electrolytic capacitor 16RE2-10-T2-T 1 10 14 C A
C6 2807 1121 Electrolytic capacitor 10RE2-220-T2-T 1 10 26 C A
C7/8 2805 3134 Electrolytic capacitor 10RE2-22-T2-T 2 10 14 C A
C9 2813 1932 Semiconductive capacitor RT-B50TKYR223K-T 1 20 5 C A
C10 2813 2415 Semiconductive capacitor RT-B50TKYR153K-T 1 20 4 C A
C11 2804 6002 Electrolytic capacitor 6.3RE2-470-T14-T 1 10 27 C A
C13, 15 2813 3283 Ceramic capacitor UP050F104Z-A-B 2 20 8 C A
C16 2807 1023 Electrolytic capacitor 50RE2-1-T2-T 1 10 15 C A
FB1~3 3035 0266 Ferrite beads BL02RN2-R62T4-T 3 10 13 C A
J1 3501 3731 DC jack HEC2305-01-250 1 1 30 B A
N 3719 4312 Ribbon cable M604A DF5H10075-50005000 1 10 24 C A
L1 3841 1057 Common mode coil CM05RB01 1 1 63 C B
N 4317 5051 Blank PCB JCM604-MA1M M211784A-1 1 1 170 C B
N 4317 5061 Blank PCB JCM604-MA3M M211784A-2 1 1 21 C A
N 4317 5091 Blank PCB JCM604-MA2M M211784A-3 1 1 16 C A
6922 1750 Battery spring (+) 522A M412225-1 1 20 7 B A
6922 1760 Battery spring (+) 522B M412226-1 1 20 10 B A
N 1 6922 6730 PCB ass'y M604-MA123M M111822*1 1 1 1,790 B Q
Mechanical Parts
2 3831 0644 Speaker 65G08BFC 1 1 120 B B
3 6909 7380 Slide contact 09D CSB-09D 1 10 26 B A
4 6922 1800 Key contact rubber MM24 M211669-1 1 1 80 B B
N 5 6922 6630 White key set MM24 M211665-2 1 10 49 A A
N 6 6922 6640 Black key set MM24 M211666-1 1 10 41 A A
N 7 6922 6650 Rubber button 604 M312191-1 1 10 41 B A
N 8 6922 6670 LED holder LMM24 M211776-1 1 10 38 C A
N 9 6922 6620 Upper case 604 (Light gray) M111813-1 1 1 260 C C
N 9 6922 6681 Upper case 604 (Black) M111813A-2 1 1 260 C C
N 10 6922 6660 Slide knob 541 M311913-2 1 10 11 B A
N 10 6922 7660 Slide knob 541 M311913-3 1 10 11 B A
N 11 6922 7881 Lower case sub ass'y M312246A*1 1 1 260 C C
N 12 6906 7261 Battery cover (Gray) M312197A*1 1 10 32 B A
Notes: N – New parts
M – Minimum order/supply quantity
R – Rank
— 9 —
FOB Japan
N Item Code No. Parts Name Specification Q M N.R.Yen R *
Unit Price
N 12 6906 7273 Battery cover (Dark gray) M311200C*16 1 10 32 B A
N 6922 6750 Rating label M312199-1 1 10 8 C A
13 0009 5573 Screw 2.6x10 14 50 2 C A
0009 5574 Screw, washer head 2.6x6 2 50 2 C A
0009 2682 Screw 2.6x8 5 50 2 C A
Notes: N – New parts
M – Minimum order/supply quantity
R – Rank
— 10 —
MA0700941A
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