Alto MS1 User manual

MODEL: MS1

CONTENT
1. INTRODUCTION..............................................................................1
2. TECHNICAL SPECIFICATION ........................................................1
3. BLOCK DIAGRAM..........................................................................2
4. SCHEMATIC DIAGRAM..................................................................3
5. PCB LAYOUT..................................................................................4
6. TEST PROCEDURE........................................................................5
7. EXPLODED VIEW & MECHANICAL PARTS LIST.........................15
8. BOM ..............................................................................................17

Connectors 1/4”jack
Type RF filtered, servo balanced input
Impedance 30 Kohm balanced, 22 Kohm unbalanced
Max. input level +26 dBu balanced and Unbalanced
AUDIO INPUT
CMRR Typ. 40dB,>55dB@1 kHz
Connectors 1/4” jack
Type Balanced
Min. output impedance 100 Ohm
AUDIO OUTPUT
Max. output level +26 dBu balanced
Frequency response 10Hz to 30kHz, +/-1dB(FLAT)
S/N >110dB, unweighted, 22Hz to 22kHz
SYSTEM
SPECIFICATIONS THD 0.005% typ.@ 0 dBu, 1khz, (unity gain), FLAT
INDICATORS Input level CLIP LED display: +7dBu
AC adaptor USA/Canada 120V~, 60Hz
U.K./Australia 240v~, 50Hz
Europe 230V~, 50Hz
POWER SUPPLY
Power consumption 5W
Dimension 130(W)×117(D)×45(H)mm(5.1”×4.6” ×1.7”)
PHYSICAL Net weight 0.8kg
z16 effects preset
z2-channel input and output connectors are compatible with balanced JACK
zFront panel LED indicator for clip and power on
zAccurate level control
1. INTRODUCTION
2. TECHNIACAL SPECIFICATION
- 1 -

1234
A B C D
4
321
D
C B A
1 2 3 4 5 6
J1 INPUT LCH
1 2 3 4 5 6
J2 OUTPUT LCH
1 2 3 4
5 6
SW1 4BIT ENCODER
-12V
SIGNAL SENSE
GCLIP
POWER SUPPLY
AC 15V 200mA INPUT
+12VDC
-12VDC
AC ADAPTOR
1 2 3 4 5 6
J3 INPUT RCH
INPUT GAIN
+12V
ENCODER 4BIT CONTROL
1 2 3 4 5 6
J4 OUTPUT RCH
A0 A1 A2 A3
A0 A1 A2 A3
3. BLOCK DIAGRAM
- 2 -

1 2 3 4 5 6 78
A B C D
8
7654321
D
C B A
1 2 3
S1 DJ-005A
D1 1N4002
D2
1N4002
C42 1000UF/35V C43 1000UF/35V
Vin
1
GND
2
+12V 3
U9
LM7812CT
Vin
2
GND 1
-12V 3
U8
LM7912CT
C13 0.1u
C14 0.1u D4
1N5817 D3 1N5817
C44 220UF/25V
C15 0.1u cer
C45 220UF/25V
C16 0.1u cer
1 2 3 4 5 6
J1 LJB0661-6
3 2
1
8 4
U1A
MC33078
R8 7.50K
C6 22P
R7 7.50K
C12 0.1u cer
C11 0.1u cer
R1 15.0K R2 15.0K
C5 22P
C29 47U/25V
R11 1.10K 3
2
1
8 4
U2A MC33078
C18 0.1u cer
C17 0.1u cer
C30 47U/25V
R12 1.10K
C7 22P
3 2
1
8 4
U3A MC33078
C51 220nF
R28 30.0K
C1 100nF
R20 10.0K
R26 150.0K
R3 15.0K
R33 1.0K
R37 220.0K
R35 1.20K R39
1.50K
C53 10nF
C3 27nF
3 2
1
8 4
U4A MC33078
R59 100 1/4W
R58 100 1/4W R21 10.0K
C63 22P
C34 47U/25V
C33 47U/25V
3 2
1
8 4
U7A MC33078
R41 100K
R18 3.74K
R22 10.0K
1 2 3 4 5 6
J2 LJB0661-6
+VCC
-VCC
C31 47U/25V
R63 51K
R62 51K
+VCC
+VCC
-VCC
-VCC
1 2
J6 CON2
LED1
RED
-VCC
R73 4.7K 1/4W
+VCC
connect to J6-1connect to J6-2
L1
FL5R
L2
FL5R
ZD1 12V 1W
ZD3 12V 1W
ZD2 12V 1W
ZD4 12V 1W
B
1
C2 E
3
Q1
2SC1815
B
1
C2 E
3
Q2 2SC1815
R57 9.1K
C48 2.2U/25V
LED2 RED
R71 1.5K
R17 6.8K
R31 4.7K
1 2
J5 CON2
connect to J5-1
connect to J5-2
CLIP POWER
R72 0R 1/4W
1 2 3 4 5 6
J3
LJB0661-6
5 6
7
U1B
MC33078
R10 7.50K
C8 22P
R9 7.50K
C23 0.1u cer
C22
0.1u cer
R4 15.0K R5 15.0K
C9 22P
C35 47U/25V
R13 1.10K 5
6
7
U2B MC33078
C21 0.1u cer
C27 0.1u cer
C36 47U/25V
R14 1.10K
C10 22P
5 6
7
U3B MC33078
C52 220nF
R29 30.0K
C2 100nF
R23 10.0K
R27 150.0K
R6 15.0K
R34 1.0K
R38 220.0K
R36 1.20K
R40 1.50K
C54 10nF
C4 27nF
5 6
7
U4B MC33078
R46 100K
1 2 3 4
5 6
SW1 288S0366
+VCC
+VCC
-VCC
-VCC
L3
FL5R
L4
FL5R
ZD5 12V 1W ZD8
12V 1W
ZD6 12V 1W
ZD7 12V 1W
+VCC
R55 9.1K
IN-CH2+ IN-CH2- IN-CH2-
IN-CH2+
C46
2.2U/25V
C47
2.2U/25V
C49 2.2U/25V
C50 2.2U/25V
A0 A1 A2 A3
A0 A1 A2 A3
C32
47U/25V
C37 47U/25V
R15 6.8K R16 6.8K
R32 4.7K R30 4.7K
TR1 J176
TR2 J176
TR3 J176
TR4 J176
A0 A1 A2 A3
TR5 J176
TR6 J176
TR7 J176
TR8 J176
+VCC
R67 1M
R68 1M
R69 1M
R70 1M
R42100K R43100K R44100K R45100K
-VCC
A0~A3:ON=+VCC,OFF=-VCC,DELAY=0.1-1S
13
2
VR1A 10KB
46
5
VR1B 10KB
C65 1.0U
C66 1.0U
C67 1.0U
C68 1.0U
C19 0.1u cer
R51 30.0K
R48 7.50K
C55 330P
3 2
1
84
U5A
MC33078
3 2
1
84
U6A MC33078
C20
0.1u cer
R47
7.50K +VCC
-VCC
C57 1000P
C59 1.0U
C60 1.0U
R53 20K
R61 100 1/4W
R60 100 1/4W R24 10.0K
C64 22P
C41 47U/25V
C40 47U/25V
5 6
7
U7B MC33078
R19 3.74K
R25 10.0K
1 2 3 4 5 6
J4 LJB0661-6
C39 47U/25V
R66 51K
R65 51K
C24 0.1u cer
R52 30.0K
R50 7.5K
C56 330P
5 6
7
U5B
MC33078
5 6
7
U6B MC33078
C28 0.1u cer
R49 7.5K
+VCC
-VCC
C58 1000P
C61 1.0U
C62 1.0U
R54 20K
C69 0.1u cer
C70
0.1u cer
+VCC
-VCC
balanced input
balanced input
Fc=18K
Fc=30hz
-12db/OCT
-12db/OCT
Fc=18K
Fc=30hz
-12db/OCT
-12db/OCT
R74 0R*
R75 0R*
HIGH Fc=18K,LOW Fc=30HZ IS NOT USED,R75=0R
HIGH Fc=18K,LOW Fc=30HZ IS NOT USED,R74=0R
CLIP LED LIGHT SET=+6dbU
C2510P
C26 10P
C38 22P
4. SCHEMATIC DIAGRAM
- 3 -

PCB:MS1 Bottom Layer Bttom Overlay Bottom Solder
PCB:MS1 Top Overlay
5. PCB LAYOUT
- 4 -

First: Use VP-7724 to test
1. Set the encoder to FLAT (encoder setting: 0000), INPUT/OUTPUT use 1/4 TRS BAL jack to connect
LCH IN, LCH/RCH OUT, plug in POWER&CLIP LED wires(semi product), the red POWER LED
lights up.
2. Input 1KHZ–6dBu(VP-7724 BAL) signal, then adjust INPUT GAIN VR, when INPUT GAIN VR is
minimum, the output is -20+/-2dbu, distortion<0.03%.
3. Adjust INPUT GAIN VR to maximum, the output is +20+/-2dbu, distortion<0.01 %( Please select the
corresponding filter when testing distortion).
4. Adjust INPUT GAIN VR, and set the output to +6.5~+8.5dbu, make sure the CLIP LED lights up
slightly.
5. Adjust INPUT GAIN VR, set the output to 0+/-0.2dbu, and also make sure the scale of GAIN VR at
0dB position.
6. According to the following table to test the frequency response, specifications are the following
(altogether 4*4=16 modes), under FLAT mode, make sure the distortion<0.005%.
7. Adjust the input signal to 1 kHz +10dbu, turn GAIN VR from minimum to maximum, make sure the
distortion will become bigger gradually till clipping (FLAT position).
LCH/RCH OUTPUT SPECIFICATION(Test Frequency dBu)
Corresponding
Function
Encoder Setting
(Binary System) 20HZ 70HZ 100HZ 1KHZ 8KHZ 20KHZ
FLAT 0000 -1.0~+1.0 -0.5~+0.5 -0.5~+0.5 -0.5~+0.5 -1.2~+0.8 -5.0~-3.0
DRUM KICK 0001 +9.5~+11.5 +7.5~+9.5 +6.0~8.0 -0.5~+1.0 -1.2~+0.8 -5.0~-3.0
ANTIRUMBLE 0010 -11.5~-9.5 -3.5~-1.5 -2.5~-0.5 -0.5~+0.5 -1.2~+0.8 -5.0~-3.0
CONCERT HALL 0011 -0.5~+1.5 +5.0~+7.0 +4.5~+6.5 -0.5~+1.0 -1.2~+0.8 -5.0~-3.0
ARENA+SUB 0100 -1.0~+1.0 -1.0~+1.0 -0.5~+0.5 +0.2~+1.5 +4.5~+6.5 +1.5~+3.5
LOUDNESS 0101 +9.5~+11.5 +7.5~+9.5 +6.0~8.0 +0.5~+1.5 +4.5~+6.5 +1.5~+3.5
ROCK&ROLL+SUB 0110 -11.5~-9.5 -3.5~-1.5 -2.5~-0.5 +0.5~+1.5 +4.5~+6.5 +1.5~+3.5
ACOUSTIC 0111 -0.5~+1.5 +5.0~+7.0 +4.5~+6.5 +0.5~+1.5 +4.5~+6.5 +1.5~+3.5
JAZZ CLUB+SUB 1000 -1.0~+1.0 -1.0~+1.0 -0.5~+0.5 -0.5~+0.5 -2.0~-0.5 -9.0~-7.0
VIRTUAL SUB 1001 +9.5~+11.5 +7.5~+9.5 +6.0~8.0 -0.0~+0.8 -2.0~-0.5 -9.0~-7.0
STAGE MONITOR 1010 -11.5~-9.5 -3.5~-1.5 -2.5~-0.5 -0.5~+0.5 -2.0~-0.5 -9.0~-7.0
JAZZ CLUB 1011 -0.5~+1.5 +5.0~+7.0 +4.5~+6.5 -0.0~+0.8 -2.0~-0.5 -9.0~-7.0
CONCERT
HALL+SUB
1100 -1.0~+1.0 -1.0~+1.0 -0.5~+0.5 +0.2~+1.5 +3.5~+5.5 -2.0~-0.5
DISCO 1101 +9.5~+11.5 +7.5~+9.5 +6.0~8.0 +0.2~+1.5 +3.5~+5.5 -2.0~-0.5
VOCAL 1110 -11.5~-9.5 -3.5~-1.5 -2.5~-0.5 +0.2~+1.5 +3.5~+5.5 -2.0~-0.5
ROCK&ROLL 1111 -0.5~+1.5 +5.0~+7.0 +4.5~+6.5 +0.2~+1.5 +3.5~+5.5 -2.0~-0.5
6. TEST PROCEDURE
The Finished Products Test
- 5 -

8. Cut off input signal, when output noise and GAIN VR are minimum, the output noise is less
than-95dBu(Please select the corresponding filter), when the GAIN VR is maximum, the output
noise is less than -78dBu, at the same time, make sure the variations of the waveform are normal
when turning the GAIN VR.
9. Connect OUTPUT to RCH OUT, make sure the RCH output specification is the same as above, and
connect the INPUT to RCH IN; also the RCH output specification is the same as above.
10. Listening Test: Input music signal, set the encoder and adjust the GAIN VR, make sure the volume
can change, and also the treble and bass have corresponding variations; cut off the input signal,
make sure the noise sound is normal, set the encoder, make sure the CLICK NOISE is normal.
Second: Use AP to test
1. Set the encoder to FLAT (encoder setting: 0000), INPUT/OUTPUT, use 1/4 TRS Balanced jack to
connect LCH IN, LCH/RCH OUT, plug in POWER&CLIP LED wires(semi product), the red POWER
LED lights up.
2. Input signal is 1KHZ 0dBu (VP-7724 BAL), make sure INPUT GAIN VR is minimum, the output is
-20+/-2dbu, and distortion<0.03%.
3. Adjust INPUT GAIN VR to maximum, the output is +20+/-2dbu, the distortion<0.01 %( It must select
the corresponding filter when test the distortion).
4. Adjust INPUT GAIN VR, set the output to +6.5~+8.5dbu, make sure the CLIP LED lights up slightly at
the moment.
5. Adjust INPUT GAIN VR, set the output to 0+/-0.2dbu, at the same time, make sure the scale of GAIN
VR at 0dB position.
6. According to the following table to test the frequency response, specifications are the following
curves (altogether 4*4=16 modes). In the meantime, make sure the distortion<0.005% under the
FLAT mode.
7. Adjust the input signal to 1 kHz +10dbu, turn GAIN VR from minimum to maximum, and make sure
the distortion will become bigger gradually till clipping (FLAT position).
8. Cut off the input signal, make sure the output noise and GAIN VR are minimum, the output noise is
less than-95dBu (select the corresponding filters), when GAIN VR is maximum, the output noise is
less than -78dBu, at the same time, make sure the variations of the waveform are normal when
turning the GAIN VR.
9. Listening Test: Input music signal, set encoderand adjust the GAIN VR, make sure the volume can
change, and also the treble and bass have the corresponding variation, cut off input signal, make sure
the noise sound is normal, set the encoder,and also make sure the CLICK NOISE is normal.
- 6 -

- 7 -

- 8 -

- 9 -

- 10 -

- 11 -

- 12 -

- 13 -

- 14 -

7. EXPLODED VIEW & MECHANICAL PARTS LIST
- 15 -

No. Part No. Description Specification Pcs
1MA05666 ZC-panel MS1 ALTO_V1.3 1
2SA00053 LED φ3 2
3HK05843 K-PCB P-MS1-DIP 1
4MB04491 ZC-rear board MS1 ALTO_V1.1 1
5NI00502 self-adhere foot cushion φ10.5*5mm(RF-011) 4
6NI00002 T-plastic nut-HC00108 accessories φ7/16"*G20/15*4.8 2
7ME00081 T-nut-HI00107 φ71
8MF00014 shakeproof washer φ3*φ6.5*0.5t 3
9MG00036 screw M3*4 7
10 NC00131 T-wooden washer 1*φ11.3*φ15.3 red 2
11 MC00769 ZC-top cover ALTO MS1 1
12 NI02386 plastic knob φ14*13mm\ 1
13 NI00363 plastic knob φ21*16mm 1
14 MG00386 screw M3*4 2
15 MG00058 screw M2*4 1
MECHANICAL PARTS LIST
- 18 -

No. Part No. Description Specification Remark
1 HK05843 PC board P-MS1-DIP
2 HK06476 PC board P-MS1-SMD
3 RD00125 SMD fixed resistor 1/10W 1.0MΩ±5% 0603 R67,R68,R69,R70
4 RD00085 SMD fixed resistor 1/10W 1.5KΩ±5% 0603 R71
5 RD00116 SMD fixed resistor 1/10W 100KΩ±5% 0603 R41,R42,R43,R44,R45,R46
6 RD00306 SMD fixed resistor 1/10W 20KΩ±5% 0603 R53,R54
7 RD00093 SMD fixed resistor 1/10W 4.7KΩ±5% 0603 R30,R31,R32
8 RD00354 SMD fixed resistor 1/10W 51KΩ±5% 0603 R62,R63,R65,R66
9 RD00097 SMD fixed resistor 1/10W 6.8KΩ±5% 0603 R15,R16,R17
10 RD00100 SMD fixed resistor 1/10W 9.1KΩ±5% 0603 R55,R57
11 CI00228 SMD ceramic capacitor
0603 0.001uF/50V C0G±5%(C1608C0G1H102JT)/TDK C57,C58
12 CI00071 SMD ceramic capacitor
0603 0.01uF/50V X7R ±10% C53,C54
13 CI00123 SMD ceramic capacitor
0603 0.027uF/50V X7R ±10% C3,C4
14 CI00185 SMD ceramic capacitor
0603 0.1uF/50V X7R±10%(C1608X7R1H104KT)/TDK C1,C2
15 CI00075 SMD ceramic capacitor
0603 0.1uF/50V Y5V +80,-20% C11,C12,C13,C14,C15,C16,C17,C18,C19,C20,C21,C22,C23
,C24,C27,C28,C38,C69,C70
16 CI00179 SMD ceramic capacitor
0603 0.22uF/25V X7R±10%(C1608X7R1E224KT)/TDK C51,C52
17 CI00175 SMD ceramic capacitor
0603 1.0uF/16V X7R±10%(C1608X7R1C105KT)/TDK C65,C66,C67,C68
18 CI00047 SMD ceramic capacitor
0603 10PF/50V C0G±0.25PF(C1608C0G1H100CT)TDK C25,C26
19 CI00062 SMD ceramic capacitor
0603 330PF/50V NPO ±5﹪C55,C56
20 SF00049 transistor PMBFJ176(SOT23)/(PHI) TR1,TR2,TR3,TR4,TR5,TR6,TR7,TR8
21 RD00282 SMD precise resistor
1/10W 1.00KΩ±1% 0603 R33,R34
22 RD00396 SMD precise resistor
1/10W 1.15KΩ±1% 0603 R11,R12,R13,R14
23 RD00321 SMD precise resistor
1/10W 1.20KΩ±1% 0603 R35,R36
24 RD00201 SMD precise resistor
1/10W 1.50KΩ±1% 0603 R39,R40
25 RD00214 SMD precise resistor
1/10W 10.0KΩ±1% 0603 R20,R21,R22,R23,R24,R25
26 RD00218 SMD precise resistor
1/10W 15.0KΩ±1% 0603 R1,R2,R3,R4,R5,R6
27 RD00457 SMD precise resistor
1/10W 150KΩ±1% 0603 R26,R27
28 RD00461 SMD precise resistor
1/10W 220KΩ±1% 0603 R37,R38
29 RD00329 SMD precise resistor
1/10W 30.0KΩ±1% 0603 R51,R52,R28,R29
30 RD00213 SMD precise resistor
1/10W 7.50KΩ±1% 0603 R7,R8,R9,R10,R47,R49
31 HB01830 PCB MS1_VER051231
32 CI00266 SMD ceramic capacitor-
RS 0603 22PF/50V NPO ±5﹪C5,C6,C7,C8,C9,C10,C63,C64
33 SG00558 integrated circuit-RS UTC4580M(4580M )(SOP8)/(YW) U1,U2,U3,U4,U5,U6,U7
8. BOM
- 17 -

No. Part No. Description Specification Remark
34 HC00183 DC jack-RS KJ-36-S φ3.5 S1
35 HC00108 stereo MIC jack φ6.3 stereo LJB0661-6 J1,J2,J3,J4
36 RA00158 fixed resistor 1/4W 0.0ΩM type R72
37 RA00184 fixed resistor 1/4W 100ΩM type R58,R59,R60,R61
38 RA00231 fixed resistor 1/4W 4.7KΩM type R73
39 HI00192 rotary switch 288S0366 SW1
40 HC00076 connector(male) 2P 2.5mm 180° J5,J6
41 RC00578 potentiometer-RS B10KΩR1220GOJH1B103FE0016 VR1
42 SB00034 transistor 2SC1815GR(SC43)/(TOSHIBA) Q1,Q2
43 SD00124 integrated circuit-RS-ACT L7912CV(TO220)/(ST) U8
44 SD00066 integrated circuit L7812CV(TO220)/(ST) U9
45 SA00105 zener diode 1W 12V 1N4742 ZD1,ZD2,ZD3,ZD4,ZD5,ZD6,ZD7,ZD8
46 SA00094 rectifier diode 1N4002/100V D1,D2
47 CB00194 electrolytic capacitor 47uF/25V φ5*11mm C29,C30,C31,C32,C33,C34,C35,C36,C37,C39,C40,C41,C59
,C61
48 CB00057 electrolytic capacitor 220uF/25V φ8*11mm C44,C45
49 CB00239 electrolytic capacitor 2.2uF/50V φ5*11mm C46,C47,C48,C49,C50
50 CB00256 electrolytic capacitor 1000uF/25V φ10*20mm 5mm C42,C43
51 AC00179 tin without lead-RS M705E Sn 3Ag-0.5Cu
52 HA01919 jump 5mm W10,W14,W16,W17,W22,W25,W26,W27,W29,W30,W31,
W33, W35,W38,W39,W42,L5A,L5B
53 HA02249 wire φ0.6_tin-plating
54 HA01925 jump 10mm
W1,W2,W3,W4,W5,W6,W7,W8,W9,W11,W12,W13,
W15,W18,W19,W20,W21,W23,W24,W28,W32,W34,
W36,W37, W40,W41, W43,W44
55 HA02249 wire φ0.6_tin-plating
56 CG00018 filter-EMI FILTER LF-22UH(WAH TAYI) L1,L2,L3,L4
57 SA00088 Schottky barrier diode 1N5817 D3,D4
58 HA01933 jump 2.5mm C60,C62
59 MA05666 panel MS1 ALTO_V1.3
60 MA05641 panel MS1
61 AE00343 solvent No.330
62 AE00177 paint-RS 4866
63 MA05563 panel-RS-ACT MS1 130.5*44*14.5_V1.4
64 MI01297 panel 2.1*44*14.5*130.5_V1.1
65 MB04491 chassis MS1 ALTO_V1.1
66 MB04484 chassis MS1
67 AE00055 solvent solvent
68 AE00056 paint-RS 2745
69 MB04390 chassis MS1 1.0t*128*113x38.8_V1.1
70 MJ00058 single light board 1*2135*1220 20.45kg
71 ME00037 iron pillar hexagon6.35*M3*4.5
72 MC00769 top cover MS1_V1.0
73 AE00055 solvent solvent
- 18 -