Alesis MM-16-USB Service manual

ALESIS

MultiMix 16 USB

(XU7)

Service Manual

P/N: 8-31-0157-A

The information in this document contains privileged and confidential information.
It is intended only for the use of those authorized by Alesis. 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 Alesis and destroy all copies of this
document. You may contact Alesis at [e-mail] or at
[e-mail].

Copyright Alesis, LLC

THIS DOCUMENT CONTAINS SENSITIVE

PROPRIETARY INFORMATION.

ALL RECIPIENTS MUST HAVE A CURRENT

NON-DISCLOSURE AGREEMENT ON FILE

COPIES OF THIS DOCUMENT

ATTENTION!

WITH ALESIS, LLC.

DO NOT MAKE ILLEGAL

Confidential Alesis Service Manual 8-31-0157-A

Preface

This document is intended to assist the service technician in the operation,
maintenance and repair of the Alesis 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 Alesis may charge as consideration for Alesis selling or
otherwise transferring this service manual (“Manual”) to you, if you are not a service and repair
facility (“Service Center”) authorized by Alesis in writing to be an authorized Service Center,
Alesis sells or transfers the Manual to you on the following terms and conditions:

Only Service Centers authorized by Alesis in writing are authorized to perform service and repairs
covered by an Alesis 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 Alesis product or part thereof, any and all
warranties of Alesis as to that product and any service contract with Alesis 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 Alesis 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 Alesis 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, Alesis does not give you the right to copy the
Manual, and you agree not to copy the Manual without the written authorization of Alesis. Alesis
has no obligation to provide to you any correction of, or supplement to, the Manual, or any new or
superseding version thereof.

Alesis 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 Alesis 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 Alesis or the use
thereof on behalf of Alesis 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
Alesis.

All Trademarks are property of their respective companies.

Confidential Alesis Service Manual 8-31-0157-A

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 un-insulated
"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
ALESIS SERVICE CENTER WILL VOID THE ALESIS WARRANTY.

PROVISION OF THIS MANUAL DOES NOT AUTHORIZE THE RECIPIENT TO
COMPETE WITH ANY ALESIS 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
ALESIS SERVICE CENTER SHALL BE SOLELY THE RESPONSIBILITY OF
THAT ENTITY, AND ALESIS 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 Alesis Service Manual 8-31-0157-A

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
step on the cords and such that nothing will be placed on or against them.

3. Periods of Non-use
AC power supply cord should be unplugged from the AC outlet.

4. Foreign Objects and Liquids
openings of the product.

5. Water or Moisture

6. Heat

7. Ventilation

8. Mounting

9. Cleaning

10. Service

11. Damage to the Product

. Do not place the product near heat sources such as stoves, heat registers, radiators or

other heat producing equipment.

. When installing the product, make sure that the product has adequate
ventilation. Improperly ventilating the product may cause overheating, which may damage the
product.

. 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.

. The product should only be cleaned as the manufacturer recommends.

. 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.

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.

. AC power supply cords should be placed such that no one is likely to

. If the product is not used for any significant period of time, the product's

. Take care not to allow liquids to spill or objects to fall into any

. The product should not be used near any water or in moisture.

. Qualified service personnel should service the unit in certain

Confidential Alesis Service Manual 8-31-0157-A

SERVICE MANUAL

MODEL:MULTIMIX 16USB

Multimix 16 USB Key Features

Three Models:

Multimix 16 USB (8 mic/line preamps, 4 stereo inputs)

Clean and powerful preamps – up to 50dB of preamp
gain for capturing quiet sources. Globally switched
phantom power.

4 Stereo inputs – Great for line-level instruments.

Internal digital effects processor with 100 preset
effects and an easy-to-read display – includes a variety

of reverbs, delays, choruses, flanges, a pitch transposer and
multiple combinations of these.

3-band EQ per channel – a potent tool for sonically
shaping each channel to get that perfect mix.

1 pre/post-fader aux send per channel (switchable) –

gives you control over the level of the pre- or post-fader
signal being routed to an external device.

1 post-fader aux send/effects send per channel – a
control for the signal being routed to another external
device or to the onboard effects processor.

Control room output level – provides control over the
separate control room output

2-track send and return – lets you mix your audio to tape
or other media and to add a tape deck or CD player to the
mix.

Stereo USB input and output – routes the main output
and the 2-track return through the USB port in crystal-

clean, 16-bit, 44.1 kHz stereo digital audio. Use the
Multimix USB as a high-quality soundcard for recording
and playback with Windows and Macintosh computers.

Specifications

For the more technical-minded, here are some detailed
specifications for the MultiMix’s operating levels.

Input Channels

Mic In Sensitivity Range: -60dBu to –10dBu nominal, +5dBu

Maximum
Line In Sensitivity Range: -40dBu to -+10dBu nominal,
+25dBu maximum
Mic/Line Gain Range: +10 to +60dB

Equalization

High-Pass Filter: 75Hz, 18dB/octave
High Shelving: 12kHz, +/- 15dB
Mid Bandpass/Band Reject: 2.5 kHz, +/- 15dB
Low Shelving: 80Hz, +/- 15dB

Aux Sends

Aux Send A & B Gain Range:- ∞ to +10dB

Aux Returns

Aux Return A Gain Range:- ∞ to +15dB
Effects Level/
Aux Return B Gain Range:- ∞ to +15dB

Channel Levels

Channel Level Gain Range: - ∞ to +10dB

Master Levels

Main Mix, Ctrl Room Gain

Range: - ∞ to +10dB

1/4” Inputs

Stereo Aux Return Level: +4dBu nominal, +20dBu maximum

RCA Inputs

Tape In Level: -10dBV nominal, +5dBV maximum

1/4” Outputs

Main Mix, Ctrl Room,
Aux 3/4, Ext Aux
Send Level: +4dBu nominal, +20dBu maximum

Headphone Output: 75 ohm output impedance
>105mW into 75 ohms, >40mW
into 600ohms

RCA Outputs

Tape Out Level: -10dBV nominal, +5dBV maximum

PACKING DIAGRAM

(US/EU/UK/AUS NZ)

ALESIS

MultiMix 16 USB

(XU7)

SCHEMATIC

AND

PCB

FILES

Confidential Alesis Service Manual 8-31-0157-A

DISASSEMBLY PROCEDURES

1. REMOVAL OF TOP PANEL/BOTTOM PANEL (Fig.1)

(A) TAKE OUT THE 14 PCS SCREW FROM WHICH THE TOP PANEL
(B) TAKE OUT THE 10 PCS SCREW FROM WHICH THE BOTTOM PANEL

(Fig.1)

2. REMOVAL OF MAIN P.C.B (Fig.2)

(A) REMOVE THE 89 PCS KNOB FROM WHICH THE TOP PANEL
(B) REMOVE THE 54 PCS NUT AND 25 PCS WASHER FROM WHICH THE TOP PANEL

(C) REMOVE THE 24 PCS SCREW FROM WHICH THE TOP PANEL

(Fig.2)