M1 Active 520
Confidential Alesis Service Manual 8-31-0171-A
ALESIS
M1Active 520/620
(AS6/7)
Service Manual
P/N: 8-31-0171-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 servicemanuals@alesis.com or at
support@alesis.com.
Copyright Alesis, LLC
ATTENTION!
THIS DOCUMENT CONTAINS SENSITIVE
PROPRIETARY INFORMATION.
ALL RECIPIENTS MUST HAVE A CURRENT
NON-DISCLOSURE AGREEMENT ON FILE
WITH ALESIS, LLC.
DO NOT MAKE ILLEGAL
COPIES OF THIS DOCUMENT
Confidential Alesis Service Manual 8-31-0171-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 8-31-0171-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 8-31-0171-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
. 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.
Confidential Alesis Service Manual 8-31-0171-A
ALESIS
M1Active 520 (AS6)
SCHEMATIC
AND
PCB
FILES
OUT IN
0
-2
-4
Acoustic Space
+2
0
-2
Hi Freq.
56Hz
80Hz
100Hz
56Hz
80Hz
100Hz
TO LED PIN1
TO LED PIN2
TO 3-03-0001 LED
GREEN
RED
L
R
5
6
7
SW2
SW3
SW4
SW4
SW-PCB
M-PCB
IO-PCB
TO IO PCB
TO MAIN PCB
TO SW-PCB
TO IO PCB
(SW-PCB)
LOW CUTOFF
LOW CUTOFF
-
+
-
+
-
+
LED PCB
TO MAIN PCB
TO LED PCB
MUTE
GND
-18V
+18V
G
G
-36V
+36V
NOT USE
NOT USE
NOT USE
NOT USE
NOT
USE
NOT
USE
NOT USE
NOT USE
NOT USE
NOT USE
NOT USE
0
AS6 Active SP CKT
A2
1 1Tuesday, December 2 0, 2005
Title
Size Document Nu mber Rev
Date: Sheet of
+12V
-12V
-12V +12V
+12V
+12V
+12V
-12V
-12V
+12
+12V
+12
+12
+12V
+12V
-12V
-12
-12V
-12V
-12
-12
-12V
-12V
+12V
12V
-12V
D13
G/R
D12
G/R
D11
G/R
D10
G/R
+
-
IC1D
TL074
13
12
14
+
-
IC1A
TL074
2
3
4
1
+
-
IC3A
TL074
2
3
4
1
+
-
IC1B
TL074
6
5
11
7
TE11
CON5P20
1
2
3
4
5
R106
820
R107
820
IC7
LM3886
1
2
3
4 5
6
7
8
9
10
V+
NC
O/P
V- V+
NC
G
MUTE
-
+
C51
103
C52
103
R67 1K
R66
1K
C53
220pF
R95
10
C55
224J
C54
100uF/16 V
R63
24.9K
R64
0
R65
9.09K
R62
3.92K
R61
R30
1K
R73
1K
C60
220pF
C65
100uF/16 V
IC8
LM3886
1
2
3
4 5
6
7
8
9
10
V+
NC
O/P
V- V+
NC
G
MUTE
-
+
R71
0
R72
22.1K
R101
10
Q3
2SC2812
Q2
2SA1179
C62
224J
C59
103
R69
1.87K
R70
53.6K
C58
103
C56
C57
R29
0
R94
10
R96
10
R97
10
C85
47P
TE1
1
2
3
4
5
6
7
8
9
10
11
12
TE3
1
2
3
4
5
6
7
8
9
10
11
12
+
-
IC2B
TL074
6
5
11
7
+
-
IC2C
TL074
9
10
8
+
-
IC2A
TL074
2
3
4
1
+
-
IC2D
TL074
13
12
14
+
-
IC3D
TL074
13
12
14
+
-
IC3C
TL074
9
10
8
TE2
1
2
3
4
5
6
7
8
9
10
TE4
1
2
3
4
5
6
7
8
9
10
+
-
IC3B
TL074
6
5
11
7
C2
22uF/25V
R2 10K
C1
22uF/25V
R1
10K
C4
22uF/25V
R4
10K
C3
22uF/25V
R3
10K
R6
4K7
TRS1
C79
104
C72
104
C73
104
C83
104
C84
104
R99
10
R98
10
R5
4K7
C5
22pF
R7 1K
VR1
20KA
C61
22uF/25V
R8
100K
C8
220pF
R10
1K
C6
22pF
R100
10
R9
5K62
C78
104
C74
104
C67
22UF/50V
C66
22UF/50V
C11
104J
C10
272J
R11
10K
C9
100uF/16 V
C15 103J
C16
563J
C12
104J
C13
822J
SW1
MID BOOST
C17
562J
R12
1K82
R13
8K25
R14
8K25
ZD6
1N5242B
D5
1N4148
R39
100K
Q1
2SC2713
C27
47UF/50V L
R33
1K
R35
15K
R32
1K
R31
10K
C25
47uF/10V
C26
47uF/10V
C28
33uF/50V -L
R34
15K
IC9
7812
1
2
3
O
G
I
IC10
7912
1
2
3
O
G
I
D3
1N4744
D4
1N4744
C68
104Z
C69
104Z
C63
22uF/50V
C64
22uF/50V
C71
10UF/50V
C70
10UF/50V
R40
6K65
R36 11K
C21
563J
C20
563J
R37
18K2
R26
15K4
R38
43K2
R19
180K
C18
R16
0
R15
C19
R17
0
R18
R42
4K32
R24
49K9
R41 7K68
R43 7K6 8
R22
80K6
R21
165K
R25
200K
R27
14.0K
R28
14.0K
C24
502J
C23
C22
103J
C31
152J
R45
4K32
C32
152J
R44
1K82
R46 9K0 9
R48 9K0 9
C33
152J
R50
4K32
C34
152J
R47
9K09
R49
4K64
C35
152J
C36
152J
R55
4K02
R54
9K09
R51 18K2
R53 18K 2
R52
18K2
R60
0
R57
6.98K
C37
103J
R76
R58
C38
103J
R56
R59
14.0K
C87
104
C88
104
C89
104
C86
104
TE6
CON6P20
1
3
4
5
6
2
TE8
2
1
TE7
2
1
R101
470
R102
470
R104
470
R105
470
3
1
2
1
3
2
4
XLR1
R81
10.0K
+
-
IC4-A
LM339
6
7
3
1
R80
10.0K 1%
C80
150PF
R85
10.0K 1%
C81
150PF
+
-
IC4-B
LM339
4
5
12
2
R84
10k
R82
1.15K
R83
1.15K
R86
10K
R87
1.15K
R88
1.15K
R89
10K
Q4
MBT4401
Q5
MBT4401
Q6
MBT4401
R90
47.5K 1%
R91
47.5K 1%
C82
10UF/50V
+
-
IC4-C
LM339
8
9
14
+
-
IC4-D
LM339
10
11
13
R92
820
R93
820
TE9
CON4P20
1
2
3
4
SW5
PUSH SW
TE10
CON4P20
1
2
3
4
D9
G/R
R103
470
+12V
-12V
CLIP_SEN SE_WOOFE R
CLIP_SEN SE_WOOFE R
CLIP_SEN SE_TWEETER
CLIP_SEN SE_TWEETER
MB_-
MB_O
MB-C
I/P
T_OP
W_IN
T_IN
T_IN
AS_C
MB_C
AS-2
MB_-
AS-O
MB_O
I/P
W_IN
T_OP
W_IN
T_IN
I/P
T_OP
AS_C
MB_C
AS-2
MB_-
AS-0
MB_O
I/P
W_IN
T_OP
W_IN
MB_O
MB_C
W_IN
AS-0(TE1.5)
AS-0(TE3.5)
AS-2(TE3.3)
AS-C(TE3.1)
AS-2(TE1.3)
AS-C(TE1.1)
T_IN
MUTE
GND
EQ_IN
EQ_IN
EQ_OUT
+12V
GND
-12V
-18V
+18V -18V
+18V
-18V
MUTE
EQ_OUT
MB_-
Confidential Alesis Service Manual 8-31-0171-A
ALESIS
M1Active 520 (AS6)
ECN
HISTORY
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