Alesis Photon 25 User manual

Confidential Alesis Service Manual 8-31-0164-A
ALESIS
PHOTON 25 (QP0)
Service Manual
P/N: 8-31-0164-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 [email protected] or at
[email protected].
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 8-31-0164-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 8-31-0164-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 8-31-0164-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.

25-key, velocity sensitive keyboard
Inputs for sustain pedal
X/Y joystick. Controls pitch bend/modulation or other parameters
Fast octave transposition
Easy template placement for Virtual Instruments and Digital Audio Workstations
16-channel MIDI input and output
4-character LED display
20 editable, storable configurations
SERVICE MANUAL
MODEL: QP0
FEATURES SPECIFICATION
Great-feeling, super-high resolution knobs

Confidential Alesis Service Manual 8-31-0164-A
ALESIS
PHOTON 25 (QP0)
SCHEMATIC
AND
PCB
FILES

Confidential Alesis Service Manual 8-31-0164-A
ALESIS
PHOTON 25 (QP0)
ECN
HISTORY

Confidential Alesis Service Manual 8-31-0164-A
ALESIS
PHOTON 25 (QP0)
BOM

QP0 BOM
LEVEL PART NUMBER DESCRIPTION QTY REF
.1 BA20231-130 BATTERY CONTACT PLATE(+) 1.000 14
.1 BA20232-130 BATTERY CONTACT PLATE(-) 1.000 13
.1 BA20233-130 BATTERY CONTACT PLATE 1.000 12
.1 BAAR-034 RUBBER FOOT 5.000 15
.1 BALE40208-0A PLASTIC BOSS (LED ) 6.000
.1 CN0220003502 2P CONNECTOR WIRE 1.000 26
.1 CN0420003404 4P CONNECTOR WIRE 340MM 1.000 27
.1 LAC22ALE32 LABEL (SERIAL BARCODE) 1.000 24
.1 LAC52ALE01 LABEL (SAFETY) 1.000 25
.1 LAP67YAH255 LABEL (RED MARKING) 3.000
.1 PT1310608 BUTTON 1.000 23
.1 PT1310675 KNOB (TRANSPARENT) 1.000 1
.1 PT133000801 FRONT PANEL (QP0) 1.000 3
..2 PT1330008 FRONT PANEL (RM) 1.000
.1 PT133010201 BATTERY COVER 1.000 17
..2 PT1330102 BATTERY COVER (RM) 1.000
.1 PT133030501 BOTTOM PLATE (QP0) 1.000 11
..2 PT1330305 BOTTOM PLATE (SPRAY) QP0 1.000
.1 SC0306PBBI SCREW 8.000 9
.1 SC0308RBBI SCREW 18.000 4
.1 SC0310RBBI SCREW 15.000 16
.1 SD58035000 LAMIN BAG 1.000
.1 7-10-0120 KEYBOARD 1.000 10
.1 7-22-0017-A CD-R 1.000
.1 7-51-0154 MANUAL REFERENCE (SAFETY) 1.000
.1 7-51-0192 MANUAL REFERENCE (QP0) 1.000
.1 7-51-1219-D INVITATION CARD 1.000
.1 7-52-0049 CHART INSERT LABEL PAGE 1 (QP0) 1.000
.1 7-52-0050 CHART INSERT LABEL PAGE 2 (QP0) 1.000
.1 7-52-0051 CHART INSERT LABEL PAGE 3 (QP0) 1.000
.1 7-80-0371 INNER CARTON 1.000
.1 7-80-0372 OUTER CARTON (QP0) 0.500
.1 7-81-0183 POLYFOAM (LEFT) 1.000
.1 7-81-0184 POLYFOAM (RIGHT) 1.000
.1 7-91-1002 SILICAL GEL 5G PACKET 1.000
.1 7-94-1012 PLASTIC BAG 0.014
.1 9-10-0066 LED NAME PLATE 1.000 5
.1 9-15-0395 PC PLATE 2.000 19
.1 9-15-0410 KNOB 12.000 18
.1 9-30-0031 RUBBER KNOB 1.000 20
.1 9-79-0322 PCB ASS'Y (FRONT PANEL) QP0 1.000 21
..2 0-09-0030 V.RESISTOR 5KB(15MM)M.SHAFT 12.000 R9,11,12,13,14,15,16,17,18,20,22,23
..2 0-17-0101 CHIP RES.(4X100 ohm 1/16 W) 1.000 R6
..2 0-17-0102 CHIP RESISTOR 4X1K 1/16W 5% 3.000 R1,3,5
..2 0-17-0103 CHIP RESISTOR 4X10K 1/16W 5% 5.000 R7,8,10,21,24
..2 0-17-0331 CHIP RESISTOR 4X330ohm1/16W 1.000 R2
..2 1-08-0222 E.CAP. 22UF 16V 20%(PANASONIC) 4.000 C10,12,13,14
..2 2-51-4401 TRANS NPN 2N4401 40V SOT-23 12.000 Q1,2,3,4,5,6,7,8,9,12,13,14
..2 2-51-4403 TRANSISTOR (2N4403) SOT-23 4.000 Q10,11,15,16
..2 2-62-0138 I.C. 74AHC138 1.000 U7
..2 2-62-0595 IC (74AHC595) 3.000 U1,3,5
..2 2-70-8932 I.C 1.000 U8
..2 2-72-0339 I.C. LM339 1.000 U6
..2 2-72-4051 IC (CD4051) 2.000 U2,4
..2 3-02-0049 LED (RED) 6.000 D6,9,10,11,29,31
..2 3-04-0007 LCD DISPLAY (RED) 2.000 D1,2
..2 6-00-0008 POSITION SHAFT ENCODE 1.000 S1
..2 9-40-0322 PCB (FRONT PANEL) 1.000
..2 BALE40208-0A PLASTIC BOSS (LED ) 6.000 (D6,9,10,11,29,31)
..2 CN1620001401 16P CONNECTOR WIRE (140MM) 1.000 J6