Alesis DEQ224 Service Manual
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Alesis DEQ224 Service Manual

Alesis DEQ224 Service Manual

Me1
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ALESIS
DEQ224 (ME1)
Service Manual
P/N: 8-31-0115-A
ATTENTION!
THIS DOCUMENT CONTAINS SENSITIVE
PROPRIETARY INFORMATION. ALL
RECIPIENTS MUST HAVE A CURRENT NON-
DISCLOSURE AGREEMENT ON FILE WITH
ALESIS DISTRIBUTION, LLC.
DO NOT DISTRIBUTE THIS DOCUMENT IN
ELECTRONIC FORM
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
support@Alesis.com.
Copyright © 2002 Alesis Distribution, LLC
Confidential
Alesis ME1 Service Manual
8-31-0115-A

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Summary of Contents for Alesis DEQ224

  • Page 1 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.
  • Page 2 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...
  • Page 3 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.
  • Page 4 The product is exposed to water or excessive moisture, The AC power supply plug or cord is damaged, d. The product shows an inappropriate change in performance or does not operate normally, or The enclosure of the product has been damaged. Confidential Alesis ME1 Service Manual 8-31-0115-A...
  • Page 5 ° Self Test - Alesis products that utilize microprocessor control contain built in test software which exercises many of the units' primary circuit functions. Self test should always be done following any repair to ensure basic functionality.
  • Page 6 When this button is first pressed, a red LED will light. This means Nominal Input Level: -10dBV (-15dBFS) the DEQ224 is in Bypass mode. As long as this LED is lit, Maximum Input Level: +5dBV (1.78 Vrms) incoming audio will pass through the unit without being affected...
  • Page 7 Audio Performance Signal To Noise Ratio: >96 dB A-Weighted, Analog In to Analog Out THD+N: <0.007%,Analog In to Analog Frequency Response: 22-22kHz ± 0.50dB , Analog In to Analog Out Power Consumption: 15 Watts Max (90-230 VAC / 50-60 Hz) Mechanical: Size: 1.75”...
  • Page 8 DISASSEMBLY PROCEDURES 1. REMOVAL OF TOP COVER / FRONT PANEL (Fig1) (A) TAKE OUT THE 4PC SCREWS FROM WHICH THE TOP PANEL. Fig.1 2. REMOVAL OF MAIN P.C.B (Fig2) (A) REMOVE THE 4 PCS NUT OF 1/4” CONNECTORS REAR PANEL. (B) REMOVE CABLE CONNECTOR FROM PCB Fig.2...
  • Page 9 DISASSEMBLY PROCEDURES 3.REMOVAL OF FRONT PAREL P.C.B (Fig.3) (A.) REMOVE THE 1PC OF SUB-PANEL. Fig.3...
  • Page 10 WIRING DIAGRAM (US/EU/UK/AUS NZ)
  • Page 11 PACKING DIAGRAM (US/EU/UK/AUS NZ)
  • Page 12 EXPLODE DIAGRAM (US/EU/UK/AUS NZ) SEQUENCIAL NO OF EXPLODE DIAGRAM WILL BE MARKED ON REF. COLUMM OF BOM LIST...
  • Page 13 PLASTIC BAG 0.014 7-93-0910 BAG FORAM 9.5"x10.6" 5-00-0149 SCREW 7-51-0136 MANUAL REFERENCE 7-51-1219 SHEET "WELCOME TO ALESIS FAMILY" 5 x 8" 7-80-0341 GIFT BOX ME4 7-91-1002 GEL SILICA 5G PACKET 9-11-0039 CASE FRONT-PANEL ME1 9-23-0022-A SPACER RUBBER PCB ME1 9-30-0024...
  • Page 14 0-17-0102 RESISTOR 4X1K 1/16W 5% R9,10,11,12,15,16,20,21,22,36 0-17-0151 RESISTOR 4X150O 1/16W R3,4,5,6 0-17-0470 RESISTOR 4X47 1/16W R23,24,25,26,27,28,30 1-60-3222 ELECT 22UF/16V(SMD) 2-51-4401 TRANSISTOR 2N4401 Q16,17,25~32,37~40,49~56,66~71 2-51-4403 TRANSISTOR 2N443 Q1~15 2-62-0595 IC 74AHC595 U2,4,5,6,8,11 2-69-2416 IC EEPROM 16K 4-20-1000 10P HEADER DIL (SMD) J3,4 4-20-1001 10P HEADER DIL (SMD)
  • Page 15 Procedures V1.00 – Approved for Mass Production QC Taiho Yamada and Peter Maresh Questions or Comments Contact Peter Maresh Design Engineer, Alesis Studio Electronics, Los Angeles pmaresh@alesis.com 310-821-5000 Taiho Yamada ME1 Project Manager, Alesis Studio Electronics, Los Angeles tyamada@alesis.com 310-821-5000...

  • Page 16: Table Of Contents

    Contents 1) QC Test Overview............3 2) Rear Panel Sub Assembly Test..........4 Items Required............4 Assembly...............4 Power Test.............4 Audio Fidelity Test............6 3) Front Panel Sub Assembly Test.........7 Items Required............7 Assembly...............7 Power Test.............7 Functionality Test.............8 4) Assembly QC............13 Before the cover is screwed on........13 After the cover has been screwed on........13 5) Final Assembly QC............14 Items Required............14...

  • Page 17: Qc Test Overview

    1) QC Test Overview QC tests are performed at two primary stages, sub-assembly level, and final assembly level. Although several of the procedures are repeated during both stages, the sub-assembly level tests are designed to test all functionality of the electronic sub-assemblies, while the final assembly tests are designed to catch assembly errors.

  • Page 18: Rear Panel Sub Assembly Test

    1 Known Good ME1 Front Panel Sub-Assembly (Front Panel) This front panel should have been reset as described in Section 6 “RESET.” 1 P3 type Alesis Power Supply 1 Computer with AP test equipment, s1_210k software, and ME2 test procedure installed in directory “C:\ME1\”.
  • Page 19 Rear Panel Sub Assembly Test CON’T Plug the P3 type Alesis Power Supply into a power source and the barrel jack into the DUT Power In jack. Verify that the front panel LEDs show the normal power up message, “DEQ224”.

  • Page 20: Audio Fidelity Test

    Panel Sub-Assembly and hold these buttons during Step 2. When started in this manner, the unit will enter Factory Test Mode. Plug the P3 type Alesis Power Supply into a power source and the barrel jack into the DUT Power In jack.

  • Page 21: Front Panel Sub Assembly Test

    Sub Assembly is ready for testing. Continue with Power Test. Power Test Plug the P3 type Alesis Power Supply into a power source and the barrel jack into the Rear Panel Power In jack. Verify that the front panel LEDs show normal power up message, “DEQ224”.

  • Page 22: Functionality Test

    Panel Sub-Assembly and hold these buttons during Step 2. When started in this manner, the unit will enter Factory Test Mode. Plug the P3 type Alesis Power Supply into a power source and the barrel jack into the DUT Power In jack.
  • Page 23 Failure of this inspection indicates a serious problem with current firmware for production. The DUT cannot continue further testing, and the Alesis Engineers listed at the top of this document should be asked for current software or current version of this document before continuing production.
  • Page 24 Front Panel Sub Assembly Test CON’T In order, press Band Button 4 through Band Button 24. Verify that when the button is held, that the column above the button lights, that the number corresponding to the button is shown in the seven-segment display, and that when the button is held, that the LEDs that are on do not flicker.
  • Page 25 Front Panel Sub Assembly Test CON’T Press the BYPASS button. Verify that the Bypass LED lights, and that when the button is held, that the LED does not flicker. Problems with no response or flickering LEDs indicate poor or failed switch, OR failed LED. Either type of problem indicates the test has FAILED.
  • Page 26 Front Panel Sub Assembly Test CON’T Press the STORE button. Verify that the Channel A signal AND Channel B signal LEDs turn on, and that when the button is held, that the LEDs that are on do not flicker. Problems with no response or flickering LEDs indicate poor or failed switch, OR failed LED.

  • Page 27: Assembly Qc

    Make sure that all artwork is clear and correctly aligned. Quickly plug the unit into an Alesis P3 type power supply to ensure LEDs light and proper startup screen appears. While the LEDs are on, check to make sure that the front lens is clear and working as anticipated.

  • Page 28: Final Assembly Qc

    2 RCA to 1/4” PHONE PLUG Cables 2 1/4” PHONE to 1/4” PHONE Cables 1 Pair of powered audio monitors such as Alesis M1 Active (8N or 8M) Assembly Connect CD Player Left Out to DUT Channel A IN using RCA to 1/4”...

  • Page 29: Functionality Test

    Step 2. When started in this manner, the unit will enter Factory Test Mode. Plug the P3 type Alesis Power Supply into a power source and the barrel jack into the DUT Power In jack. Verify that the front panel LEDs show normal power up message, “DEQ224”.
  • Page 30 Failure of this inspection indicates a serious problem with current firmware for production. The DUT cannot continue further testing, and the Alesis Engineers listed at the top of this document should be asked for current software or current version of this document before continuing production.
  • Page 31 Press the DOWN button. Verify that the Channel A signal AND clip LEDs light, and that when the button is held, that the LED pattern is in working order as in the Front Panel Sub Assembly Test. Problems with no response or flickering LEDs indicates poor or failed mechanical fit for the switch, and the test has FAILED.
  • Page 32 Final Assembly QC CON’T Press the STORE button. Verify that the Channel A signal AND Channel B signal LEDs turn on, and that when the button is held, that the LED pattern is in working order as in the Front Panel Sub Assembly Test. Problems with no response or flickering LEDs indicates poor or failed mechanical fit for the switch, and the test has FAILED.

  • Page 33: Reset

    Press the UP and DOWN buttons on the DUT and hold these buttons during Step 2. When started in this manner, the unit will RESET. Plug the P3 type Alesis Power Supply into a power source and the barrel jack into the DUT Power In jack.

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