Alto Professional MultiMix 4 USB FX User manual

Confidential Alto Professional Service Manual
Alto Professional
MultiMix 4 USB FX
[LXUG]
Service Manual
v1.0
The information in this document contains privileged and confidential information. It is intended
only for the use of those authorized by Alto Professional. If you are not the authorized, intended
recipient, you are hereby notified that any review, dissemination, distribution or duplication of
this document is strictly prohibited. If you are not authorized, please contact Alto Professional
and destroy all copies of this document. You may contact Alto Professional at
[email protected].
© Copyright Alto Professional
ATTENTION!
This document contains sensitive proprietary
information.
All recipients must have a current non-disclosure
agreement on file with Alto Professional.
Do not make illegal copies of this document.

Confidential Alto Professional Service Manual
Preface
This document is intended to assist the service technician in the operation, maintenance and
repair of the Alto Professional device. Together with the User Reference Manual, this document
provides a complete description of the functionality and serviceability of the Device. Any
comments or suggestions you may have pertaining to the document are welcome and
encouraged.
Read This!
In addition to any purchase price that Alto Professional may charge as consideration for Alto
Professional selling or otherwise transferring this service manual ("Manual") to you, if you are not
a service and repair facility ("Service Center") authorized by Alto Professional in writing to be an
authorized Service Center, Alto Professional sells or transfers the Manual to you on the following
terms and conditions:
Only Service Centers authorized by Alto Professional in writing are authorized to perform service
and repairs covered by an Alto Professional warranty (if any), and transfer of the Manual to you
does not authorize you to be an authorized Service Center. Therefore, if you perform, or if the
Manual is used to perform, any service or repairs on any Alto Professional product or part
thereof, any and all warranties of Alto Professional as to that product and any service
contract with Alto Professional for that product shall be voided and shall no longer apply
for such product, even if your services or repairs were done in accordance with the
Manual.
All service or repairs done by you or with reference to the Manual shall be solely your
responsibility, and Alto Professional shall have no liability for any such repairs or service work.
All such service or repairs are performed at the sole risk of the person performing the
service or repairs. You agree that all such work will be performed in a competent, professional
and safe manner at all times and to indemnify and fully hold Alto Professional and its successors
and assigns harmless in the event of any failure to so perform.
Your purchase of the Manual shall be for your own ultimate use and shall not be for purposes of
resale or other transfer.
As the owner of the copyright to the Manual, Alto Professional does not give you the right to
copy the Manual, and you agree not to copy the Manual without the written authorization of Alto
Professional. Alto Professional has no obligation to provide to you any correction of, or
supplement to, the Manual, or any new or superseding version thereof.
Alto Professional shall have the right to refuse to sell or otherwise transfer repair parts or
materials to you in its sole discretion. You shall not use, sell or otherwise transfer spare or
replacement parts supplied by Alto Professional to you (i) to repair or be used in products
manufactured for or by third parties or (ii) to any third parties for any purpose.
You shall not make any warranties or guarantees with respect to the products of Alto
Professional or the use thereof on behalf of Alto Professional or in your own name.
The foregoing describes the entire understanding related to sale or transfer of the Manual to you,
and no other terms shall apply unless in a writing signed by an authorized representative of Alto
Professional.
All Trademarks are property of their respective companies.

Confidential Alto Professional Service Manual
Warnings
TO REDUCE THE RISK OF ELECTRIC SHOCK OR FIRE, DO NOT EXPOSE
THIS PRODUCT TO WATER OR MOISTURE.
The arrowhead symbol on a lightning flash inside a triangle is
intended to alert the user to the presence of uninsulated "dangerous
voltage" within the enclosed product which may be of sufficient
magnitude to constitute a risk of electric shock to persons.
The exclamation point inside a triangle is intended to alert the user
to the presence of important operating, maintenance and servicing
instructions in the literature which accompanies the product.
REPAIR BY ANY PERSON OR ENTITY OTHER THAN AN AUTHORIZED
ALTO PROFESSIONAL SERVICE CENTER WILL VOID THE ALTO
PROFESSIONAL WARRANTY.
PROVISION OF THIS MANUAL DOES NOT AUTHORIZE THE RECIPIENT TO
COMPETE WITH ANY ALTO PROFESSIONAL DISTRIBUTOR OR
AUTHORIZED REPAIR SERVICE CENTER IN THE PROVISION OF REPAIR
SERVICES OR TO BE OR MAKE REPAIRS AS AN AUTHORIZED SERVICE
CENTER.
ALL REPAIRS DONE BY ANY ENTITY OTHER THAN AN AUTHORIZED ALTO
PROFESSIONAL SERVICE CENTER SHALL BE SOLELY THE
RESPONSIBILITY OF THAT ENTITY, AND ALTO PROFESSIONAL SHALL
HAVE NO LIABILITY TO THAT ENTITY OR TO ANY OTHER PARTY FOR ANY
REPAIRS BY THAT ENTITY.
Regarding the Power Supply Fuse
CAUTION: The product under service may employ the use of a
replaceable fuse. Danger of fire or electrocution if fuse is incorrectly
replaced. Replace with only the same type or equivalent type
recommended by the equipment manufacturer.
Regarding the Internal Battery
CAUTION: The product under service may employ the use of a
internal battery. Danger of explosion if battery is incorrectly
replaced. Replace only with the same or equivalent type
recommended by the manufacturer. Dispose of used batteries
according to the manufacturer's instruction.

Confidential Alto Professional Service Manual
Safety Instructions
Carefully read the applicable items of the operating instructions and these safety suggestions
before using this product. Use extra care to follow the warnings written on the product itself and
in the operating instructions. Keep the operating instructions and safety suggestions for
reference in the future.
1. Power Source. The product should only be connected to a power supply which is
described either in the operating instructions or in markings on the product.
2. Power Cord Protection. AC power supply cords should be placed such that no one is likely
to step on the cords and such that nothing will be placed on or against them.
3. Periods of Non-use. If the product is not used for any significant period of time, the
product's AC power supply cord should be unplugged from the AC outlet.
4. Foreign Objects and Liquids. Take care not to allow liquids to spill or objects to fall into
any openings of the product.
5. Water or Moisture. The product should not be used near any water or in moisture.
6. Heat. Do not place the product near heat sources such as stoves, heat registers, radiators
or other heat producing equipment.
7. Ventilation. When installing the product, make sure that the product has adequate
ventilation. Improperly ventilating the product may cause overheating, which may damage
the product.
8. Mounting. The product should only be used with a rack which the manufacturer
recommends. The combination of the product and rack should be moved carefully. Quick
movements, excessive force or uneven surfaces may overturn the combination which may
damage the product and rack combination.
9. Cleaning. The product should only be cleaned as the manufacturer recommends.
10. Service. The user should only attempt the limited service or upkeep specifically described in
the operating instructions for the user. For any other service required, the product should be
taken to an authorized service center as described in the operating instructions.
11. Damage to the Product. Qualified service personnel should service the unit in certain
situations including without limitation when:
a. Liquid has spilled or objects have fallen into the product,
b. The product is exposed to water or excessive moisture,
c. The AC power supply plug or cord is damaged,
d. The product shows an inappropriate change in performance or does not operate
normally, or
e. The enclosure of the product has been damaged.

Part number Part name Spec Usage
10530029 Iron column DN-MB6029, M3 tapped holes at both ends, 13mm, low carbon steel, white zinc plated (Iron column1) 5
10530038 Iron column DN-MB6038, M3*10, both ends of the chamfer depth 0.9mm, V1.0 2
10530054 Iron column DN-MB6054, M3 screw hole + M3 screw, 12.5mm + 6mm. (Iron column2) 1
12030007 Rocker switch AN-S308,R612KKET0F1,(0.8T) 1
12030010 Rocker switch AN-S311,RA20KKFT0F 1
16040888 Wire AN-W4448,2P,22#,UL1007,100mm 1
16040889 Wire AN-W4449,2P,22#,UL1007,100mm 1
20200038 Switch cap DN-PN1034,ABS,T=1.1mm,PANTONE 5435C,Grey,V1.0 4
20210009 Knob cap DN-PN2008, D11.2*3.9mm cap, ABS, dark blue 2
20210016 Knob cap DN-PN2013, D7.10*3.7mm cap, ABS, etched, black 2
20210092 Knob DN-PN2065, D10*17.2mm, ABS, black 15
20210093 Knob cap DN-PN2066, D7.10*3.7mm cap, ABS, etched, blue (PANTONE: 2945C) 6
20210094 Knob cap DN-PN2067, D7.10*3.7mm cap, ABS, etched, red (PANTONE: 1805C) 4
20210095 Knob cap DN-PN2068, D7.10*3.7mm cap, ABS, etched, grey 3
20210120 Knob cap DN-PN2089, ABS, black 6
20210121 Knob cap DN-PN2008,D11.2*3.9mm,ABS,grey 4
20240017 Support column DN-PB3013, ABS, T=1.0mm, PANTONE 5435C, Grey-white, V1.1 (button connection column) 3
20300105 Foot pad RF-005 4
23070042 EPE foam LXUG, high density pearl cotton, T=13mm, V1.0 2
23150039 Paper tray LXUG, left, 100% corrugated paper, T=2.5mm, ROHS, V1.0 1
23150040 Paper tray LXUG, right, 100% corrugated paper, T=2.5mm, ROHS, V1.0 1
30010060 Thermal casing Φ6*10*0.28mm, UL, black 4
30100171 Insulating sheet DN-HA094, Mylar, black, 153*75*1mm, single-sided gum, V1.0 1
30150157 Copper foil paper Brass single guide, T=0.06mm, 74*68mm, single-sided adhesive, V1.0 1
70010026 Full tooth screw AN-C10026, M3*5mm, cross round head, screw head D5.5mm, metric machine teeth, black zinc, hardened 24
70010338 Full tooth screw Φ2.6*10mm, cross round head, screw head D4.5mm, self-tapping small tail, black zinc, hardened 4
CR010661 LXUG POWER PCBA LXUG POWER ASSY 1
CR010663 LXUG USB PCBA LXUG USB ASSY 1
CR010665 LXUG MAIN PCBA LXUG MAIN ASSY 1
DR002988 Top cover with silkscreen DN-MC1137, SECC, T=0.8mm, silk screen 2955C/White C, V1.0 1
DR002989 Buttom cover with silkscreen DN-MC5216, SECC, T=0.8mm, silk screen 2955C/White C, V1.0 1
13010161 adapter AN-T10160,K36V180080G,100-240V,50/60Hz,18V/0.8A,1.5m,EU 1
16150008 USB cable AN-W1506,28#,UL2725,1800mm 1
20650019 Cover AN-PECO17, left cover, ABS black, black rubber paint on the outer surface, V1.0 1
20650020 Cover AN-PECO18, right cover, ABS black, black rubber paint on the outer surface, V1.0 1
22011330 Manual TMX1,User guide,V1.2 1
22011363 Manual ALTO,Safety&Warranty manual,7-51-1316-G 1
22140018 Software download card TMX1, 200g double copper, 120*120mm, color printing, cover film, V1.0 1
23010413 Poly bag PE,60*200*0.06mm 1
23010590 Poly bag PE,160*260*0.025mm 1
23010595 Poly bag PE,300*400*0.06mm 1
23031563 Carton A=A, cattle cardboard, T=6mm, 413*305*280mm 1
23090810 Giftbox 350g gray card + BE double pit, 287*248*98mm 1
23130046 paper card LXUG,A=A,T=6mm,400*288mm,V1.0 1
23130049 paper card LXUG,(2),A=A,T=6mm,V1.0 1
23130050 paper card LXUG,(3),A3A,T=3mm,V1.0 1
70010026 Full tooth screw AN-C10026, M3*5mm, cross round head, screw head D5.5mm, metric machine teeth, black zinc, hardened 11
70010697 Full tooth screw M3*7mm, hexagonal flat head, screw head D6, black zinc, hardened 2
70010826 Full tooth screw M3*6mm, inner hexagon (3MM thick), screw head D6mm, metric teeth, black zinc, hardened 6
90021787 Serial sticker TMX1,64*13mm,V1.0 6
90041867 GTIN14 sticker TMX1,90*42mm,V1.0 1
90080001 Destination sticker GA0/GA1/GA2, coated paper, yellow bottom 3
90220509 Special sticker LAU8,46*5mm,V1.0 1
TMX1 Level One Bom

EFX
-0
+0
+0
+0
-0
-0
-0
+0
-0
HALLS2
DELAY2
DELAY1
ROTARY
HALLS1
BYPASS
CHORUS/ROOM2
CHORUS/ROOM1
PLATE3
PLATE2
PLATE1
ROOM3
ROOM2
ROOM1
FLANGE
CHORUS
From Power supply page
C293
4.7uF/16V
C294
4.7uF/16V
1
DAC_OUT
2
INT/NEXT
3XTAL1
4XTAL2
5P0/SDA
6P1/SCK
7P2
8P3
9
WDCLK
10
BITCLK
11
SYSCLK
12 NRST
13
GND
14
BYPASS
15
VDD
16
ADC_IN
U41
AL3201SCR
C297
104p
C24
104p
R366
10K
C299
104p
C300
47uF/25V
R368
5.1K
C301100pR385
5.1K
1
2
3
M1
12 MHz
1
D0
2
D1
3
D2
4
D3
5C
S2
ES162102E0B-HA1
R380
5.1K
C222
1uF
1
2
3
VR18-A
A20K
4
5
6
VR18-B
A20K
C209
47uF16V
C210
47uF16V
D34
1N4148
D35
1N4148
D36
1N4148
D37
1N4148
1MC/SCL/FMT
2MD/SDA/DEMP
3DOUT
4
LRCK1
5
BCK1
6
SCKI1
7VDD
8DGND
9SCKI2
10 BCK2
11 LRCK2
12 DIN
13 ZEROR
14 ZEROL15
RST
16
SGND
17
VOUTR-
18
VOUTR+
19
VOUTL-
20
VOUTL+
21
VCOM
22
AGND2
23
AGND1
24
VCC
25 VINL
26 VINR
27 MS/ADR/IFMD
28
MODE
U2
PCM3060
+
-
5
6
7
U35-B
R24
820R ohm
R26
7.5Kohm
C5 470p
R28
820Rohm
C6
470p
R29
7.5Kohm
R31
10Kohm
R32
10Kohm
R34
1K
+
-
3
2
1
U35-A
R36
820R ohm
R38
7.5Kohm
C18470p
R73
820R ohm
C19
470p
R235
7.5Kohm
R260
10Kohm
R362
10Kohm
R364
1K
+
-
3
2
1
U36-A
R236
4.3K
R247
5.1K
C21220p
C23
680p
R365
1K
R269
10K
R270
47K
+
-
5
6
7
U36-B
R369
4.3K
R370
5.1K
C25220p
C26
680p
R371
10K
R373
47K
R374
47R
R37547R
R376
47R
R377
47R
R378
1K
R379
47R
R381
47R
R382
47R
R383
47R
R386
220k ohm
C28
104p
C29
104p
R391
4.7K
C31
10uF/16V
R44447R
R464
47R
R46547R
R466
47R
C214
152p
C215
R467
10K
Q17
FMMT4403
Q18
FMMT4403
Q19
FMMT4403
Q20
FMMT4403
Q27
MBT4401
R11
100K
R12 20K
R14 10K R15 10K
R388
75K
C8
105p
R392 100K
3
2
1
Q29
TL431
R397
10K
R399
10K
R400
5.1K
R468
47K ohm
R469
5.1K
R470
47K
R471
100K
Q26
2SC3326
Q25
2SC3326
C4
47uF16V
C160
47uF16V
R272 5.1K
R423
47K
C218
104p
C219104p
C247
104p
C40610uF/16V
R510
10K
+
-
3
2
1
U3-A
NJM4580
+
-
5
6
7
U3-B
NJM4580
C34
22uF16V
C36
10uF16V
1
IN
2
GND
3
EN
4
BYP
5
OUT
U4
LP2985AIM5-3.3
C32
104p
C37
104p
C38
104p
R21
8.2K
R22
20K
C340
104p
C342104p
C343
104p
C345104p
8
4
U35-C
NJM2068
8
4
U36-C
NJM2068
1
2
3
4
5
6
7
8
9
TE1
SIP9-2.54MM
8
4
U3-C
NJM4580
C71
104p
C72104p
+3.3VD
DG
INT-EFX
MIX-L
DG
DG
MIX-R
DG
+5V
+5V
DG
DG
DG
+3.3VD +5V
+3.3VD
+15V
-15V
-15V
-15V
+15V
+15V
DG
VCOM
AGND
VCOM
DG DG DG
D5V +3.3VD
DG
DG
DG
D5V
+5V
+48V
-15V
+15V
+15V
-15V
PG
PG OGND

MIC 1
INPUT
LINE 1
INPUT
INT-EFX
MIC 2
INPUT
LINE 2
INPUT
INT-EFX
GUITAR SWITCH
HPF
HPF
+0
+0
+0
+0
-0
+0
+0
+0
+0
-0
GUITAR SWITCH
GUITAR
LINE
GUITAR
LINE
80HZ+/-15dB
12kHZ +/-15dB
80HZ+/-15dB
12kHZ +/-15dB
-0
-0
PAN
PAN
LEVEL
LEVEL
12
3
J15
1
2
3
4
5
J14C5547uF,16V
C5647uF,16V
C57
2200uF,10V
R56
20.0k 1%
R57
20.0k 1%
C58
47uF,63V
C60
47uF,63V
R7
3.32k 1%
C1
220
Q1
5087
Q2
5087
Q3 Q4
R13
3.32K1%
C7
220pF
R19
680R
R27
680R
R33
1.5K1%
R37
3.01K1%
R40
3.01K1%
R42
2.2K1%
+
-
3
2
1
U8-A
NJM4580
+
-5
6
7
U8-B
NJM4580
R44
1K1%
R46
1K1%
R48
7.5K1%
R50
7.5K1%
R52
7.5K1%
R54
7.5K1%
R101
6.2 1%
CW
1
2
3
VR50
A5K
R452
20K
R454
20K
R455
12K
R456
3.9K
R453
120K
4
5
6
SW9-B
C378
104/MET
C379
104/METC380
104/MET
C17
47uF,16V
R1
150 ohm
C22
47uF,16V
C249
47uf/16
C162
47uF,16V
CW
1
2
3
VR29
A10K
CW
1
2
3
VR35
A50K
R264
4.7K
R253
5.1K
R24320K
R268
5.1K
R267
5.1K
C12847p
R273
5.1K
CW
1
2
3
VR1
B10K
R61
5.1K
R63
5.1K
C97
47uF,63V
12
3
J1
1
2
3
4
5
J2
C33
47uF,16V
C39
47uF,16V
C43
2200uF,10V
R80
20.0K1%
R81
20.0K1%
C44
47uF,63V
C45
47uF,63V
R82
3.32k 1%
C47
220pF
Q5
5087
Q6
5087
Q7 Q8
R83
3.32k 1%
C49
220pF
R84
680R
R94
680R
R95
1.5K1%
R96
3.01K1%
R97
3.01K1%
R98
2.2K1%
+
-
3
2
1
U1-A
NJM4580
+
-5
6
7
U1-B
NJM4580
R119
1K1%
R121
1K1%
R132
7.5k 1%
R133
7.5k 1%
R134
7.5K1%
R135
7.5k 1%
R136
6.2R1%
CW
1
2
3
VR53
A5K
R138
150 ohm
C51
47uF,16V
C6A
47uF,16V
C78
CW
1
2
3
VR23
A10K
CW
1
2
3
VR24
A50K
R151
4.7K
R152
5.1K
R15420K
R155
5.1K
R156
5.1K
C7947p
R158
5.1K
CW
1
2
3
VR25
B10K
R159
5.1K
R181
5.1K
C80
47uF,16V
D14
1N4148
D16
1N4148
D15
1N4148
D17
1N4148
D18
1N4148
D22
1N4148
D21
1N4148
D25
1N4148
D29
1N4148
D28
1N4148
R448
1K
R447
1K
D26
1N4148
D27
1N4148
R450
1K
R449
1K
1
2
3
S1-A
4
5
6
S1-B
R35
20K
R39
20K
R41
12K
R43
3.9K
R45
120K
4
5
6SW8-B
C10
104/MET
C14
104/MET
C20
104/MET
C27
47uF,16V
R2
20.0K1%
R3
20.0K1%
R18
1M
C250
10
C251
10p
C295
10p
C296
10p
C304
10p
C315
10p
C34910p
C350
10pF
C390102
C391102
C392220p
C393220p
C236
223
C237
1u/50
R422
1M
7
8
9
S1-C
R4
5.1K
R5
1K R309
5.1K
R489
120 ohm
C39847p/50
10
11
12
S1-D
R271
120 ohm
R66
7.5K
C9
223/M
C53
223/M
R68
7.5K
R69
10K
R70
2.7K
C11422P
C115 472/M C116 472/M
R17
7.5K
C2
223/M
C3
223/M
R20
20K
R71
10K
R72
2.7K
C5222P
C68
472/M
C73
472/M
R75
10K
C66
47P
R76
10K
R77 20K
C67
47uF,63V
R79
10K
C6947P
R85
10K
R86
20K
C70
47uF,25V
+
-
3
2
1
U12-A
NJM4580
+
-
5
6
7
U12-B
NJM4580
+
-
3
2
1
U9-A
NJM4580+
-
5
6
7
U9-B
NJM4580
+
-
3
2
1
U17-A
+
-
5
6
7
U17-B
+
-
3
2
1
U10-A
+
-
5
6
7
U10-B
+
-
5
6
7
U54-B
TL072
+
-
3
2
1
U54-A
TL072
CW
1
23
VR2
B50K
CW
1
2
3
VR3
B50K
CW
1
2
3VR4
B50K
CW
1
2
3
VR5
B50K
R55
6.81k 1%
R59
6.81k 1%
R64
20.0k 1%
R78
20.0k 1%
8
4
U8-C
NJM4580
8
4
U1-C
NJM4580
C262
104p
C263
104p
C264
104p
C266
100uF25V
C267
100uF25V
C268
104p
C269
104p
C270
104p
C271
104p
C265
104p
C279
104p
C280
104p
C289
104p
C290
104p
C11
104p
C13
104p
8
4
U12-C
NJM4580
8
4
U9-C
NJM4580
8
4
U17-C
8
4
U10-C
8
4
U54-C
TL072
+48V
-15V
+15V
INT-EFX
MIX-R
MIX-L
+48V
+15V
INT-EFX
MIX-R
MIX-L
+15V
-15V
+15V
PEAK1
PEAK2
A
B
B
A
+15V
-15V
PG