Alesis Andromeda A6 Service Manual
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Alesis Andromeda A6 Service Manual

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A6 Andromeda (A6)
Service Manual
THIS DOCUMENT CONTAINS SENSITIVE
PROPRIETARY INFORMATION. ALL
RECIPIENTS MUST HAVE A CURRENT NON-
DISCLOSURE AGREEMENT ON FILE WITH
DO NOT DISTRIBUTE THIS DOCUMENT IN
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 © 2003 Alesis, LLC
Confidential
ALESIS
P/N: 8-31-0089-C
ATTENTION!
ALESIS, LLC.
ELECTRONIC FORM
Alesis Service Manual
8-31-0089-C

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  • 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 Ver A: BRS: added new cover page, added Fatar key removal instructions. Ver B: 6/13/02 BRS: added more debugging tips, added rev C main board. Ver C: 10/30/03 ATM: Added additional warning information for Battery replacement (per UL) Confidential Alesis Service Manual 8-31-0089-C...
  • Page 3 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.
  • Page 4 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 5 The product is exposed to water or excessive moisture, The AC power supply plug or cord is damaged, The product shows an inappropriate change in performance or does not operate normally, or The enclosure of the product has been damaged. Confidential Alesis Service Manual 8-31-0089-C...

  • Page 6: Theory Of Operation

    Voice busses, Noise, ASIC control tuning, external MIDI FX busses inputs foot pedals Control, Analog Master power regulators FX return analog output circuitry (op amps) analog distortion Tuning analog noise generator signal, FX send Confidential Alesis Service Manual 8-31-0089-C...

  • Page 7: Test Procedures

    Replaces the factory default User Programs and Mixes with the User Bank Soft Button 8 Programs and Mixes. The next time a RAM initialization is done (Soft Button 3), these banks will be used to initialize the User Banks. Confidential Alesis Service Manual 8-31-0089-C...
  • Page 8 The values should stop changing immediately after (within one second) a pot is turned. If a pot value continues to jitter after you let go, there may be a problem with the pot, the front panel, or the ADC circuitry on the Digital Main Board. Confidential Alesis Service Manual 8-31-0089-C...
  • Page 9 To perform this test, press soft button 2. A MIDI cable should be connected from MIDI OUT to MIDI IN. This test will send a series of bytes through the MIDI port and read them back in. If it passes, the display will read “MIDI TEST PASSED”. 2.27 LCD Test Confidential Alesis Service Manual 8-31-0089-C...
  • Page 10 PASSED!”) when the DONE soft key is pressed. This is for board testing, when the user is only interested in the status of that board, not the whole system. The software will tell the user which switches or pots were missed on the particular board being tested. Confidential Alesis Service Manual 8-31-0089-C...
  • Page 11 LCD display. Press SB#3 again to restore LCD contrast back to normal. 2.319 Test LCD contrast pot by turning small contrast knob, found on the right side of the LCD, back and forth while verifying that the contrast changes. Confidential Alesis Service Manual 8-31-0089-C...
  • Page 12 2.328 Perform remaining tests as required by A6 diagnostic software. 2.329 Follow and repeat steps 1.17 to 1.19 until all remaining tests have been performed. 2.330 If unit passes all required tests mentioned in this document, then unit has passed the Front Panel Test! Confidential Alesis Service Manual 8-31-0089-C...
  • Page 13 Turn soft knob 8 (BAND) to see which bands failed for that voice. If the failure is in columns 1 or 2 (OSC), the the Osc ASIC is bad. If the failure is in columns 5 or 6 (FILT), then the Filter ASIC is bad. Confidential Alesis Service Manual 8-31-0089-C...
  • Page 14 Aux Outputs to an amp and speakers, then select AUX using the Output button (at the far right of the unit). 11. POWER CYCLE TEST. Cycle power a few times and verify that the unit boots properly each time. Confidential Alesis Service Manual 8-31-0089-C...
  • Page 15 Go into diagnostic mode by holding Soft Button 2 during power up and verify the problem (if applicable). ° Clear memory by powering up holding Soft Button 4 during power up, allow the instrument to re-tune, and see if the problem is fixed. Confidential Alesis Service Manual 8-31-0089-C...

  • Page 16: General Troubleshooting

    (burnt, or loose components are a dead giveaway). ° 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 17 3.202 Unit Doesn’t Boot – Stuck at Splash Screen If the LCD is stuck in the splash screen, “Alesis A6 Andromeda”, it means the microprocessor on the Front Panel Left board is working, but may have a communication problem with the Main board, or the Main board itself may have a problem.

  • Page 18: Front Panel Problems

    Ribbon Controller during this process. ° Go into diagnostic mode by holding down Soft Button 3 during power up. Verify ribbon operation. ° Make sure the Ribbon Controller cable is plugged in properly. Confidential Alesis Service Manual 8-31-0089-C...

  • Page 19: Audio Problems

    3.402 Low Output from Main or Aux Outs ° Try replacing the output mute transistors Q1-Q4. If any one of these are bad, it could cause low output on all four outputs. Confidential Alesis Service Manual 8-31-0089-C...
  • Page 20 R73 and the right is R74. So, the left resistor should be a 20K resistor. The right one should be a 0 ohm resistor. Look around the other ASICs to see what it should look like. Confidential Alesis Service Manual 8-31-0089-C...

  • Page 21: Mechanical Problems

    (near the end of the keys). This squeezes the foam against the ends of the keys. Inspect the ribbon bracket and make sure it is bent at the correct angle. You can manually bend the bracket until the holes line up and the problem is fixed. Confidential Alesis Service Manual 8-31-0089-C...

  • Page 22: Repair Procedures

    Replace the top panel by aligning the front end first, then carefully lowering the back end. ° Make sure the metal bracket right beneath the Ribbon Controller does not pinch the ribbon cables coming from the keyboard. ° Re-screw all of the screws. Confidential Alesis Service Manual 8-31-0089-C...
  • Page 23 Top Panel (with Front Panel Right board removed Front Panel Left PCB Front Panel Center PCB Ribbon Controller Bracket Pitch/Mod Wheels Endcap Bottom Panel Main PCB Analog ASIC PCB BA02 Power Supply Fatar Keybed Confidential Alesis Service Manual 8-31-0089-C...

  • Page 24: Replacing Keys

    4.21 Remove the spring by gently pulling it up and out with a pair of pliers. Do not pull too much or else the spring will get stretched out. Confidential Alesis Service Manual 8-31-0089-C...
  • Page 25 4.22 Insert a flat-head screwdriver into the top slot of the key. 4.23 Use the screwdriver to bend the tab inside the key while pushing the key forward and up. Confidential Alesis Service Manual 8-31-0089-C...
  • Page 26 4.24 Slide the key off the keybed. Confidential Alesis Service Manual 8-31-0089-C...
  • Page 27 ALESIS ANDROMEDA (A6) BOM PCB FILES Confidential Alesis Service Manual 8-31-0089-C...
  • Page 28 KEYBOARD ANALOG SYNTH ANDROMEDA A6 - UL 7-41-0005 CABLE POWER UL/CSA SJT 7-51-1219-B SHEET "WELCOME TO ALESIS FAMILY" 5 x 8" KEYBOARD ANALOG SYNTH ANDROMEDA A6 4-18-1200-C CABLE DIL RIBBON 16-PIN 0.1" 260mm M-F REVRS SPC KEYBOARD TO MAIN PCB...
  • Page 29 A6-UL BOM 2002-09-18 (4)under large knob (1)Master Volume control under 9-15-0246-A SLEEVE POT-BUSHING DUAL A6 - REV A medium knob 9-15-1150 BEZEL CARD S6 9-15-1360-A CAP ROUND SWITCH GREY A6 - REV A 9-15-1361-A CAP RECTANGULAR SWITCH GREY A6 - REV A 9-15-1362-A CAP RECTANGULAR SWITCH BLACK A6- REV A 9-15-1363-A CAP ROUND SWITCH DARK BLACK A6 - REV A 9-15-1364-A CAP ROUND SWITCH RED A6 - REV A...
  • Page 30 A6-UL BOM 2002-09-18 2-11-2940 REG VOLTAGE LM2940C 5V TO-220 U28 U38 2-24-0138 IC OPTO-ISOLATOR 6N138 2-27-0021 ASIC KEY-SCAN PLCC-68 ASIC DSP1 DIG-FX 84-PIN 2-27-0022 2-50-4148 DIODE SIGNAL LS4148 MELF D2-6 2-51-0140 DIODE POWER SCHOTTKY MBRS140LT3 40V 1A 2-51-4401 TRANS NPN 2N4401 40V 1A SOT-23 Q1-2 2-62-0005 IC 74AHC1GU04 SINGLE INVERTER SOP-5...
  • Page 31 A6-UL BOM 2002-09-18 IC FLASH IMAGE V1.33 (BOOT=V1.20.37/OS=V1.40.12) C/S:0X2B59 4/12/02 A6 9-61-0061 IC FLASH-ROM 1024Kx16 90nS TSOP-48 2-69-6160 7-53-0198 STICKER FLASH IMAGE V1.33 A6 SOFTWARE IMAGE V1.33 (BOOT=V1.20.37/OS=V1.40.12) 9-60-0061 C/S:0X2B59 4/12/02 A6 9-79-0205 ASSY PCB ANALOG MASTER A6 0-15-0105 RES 1M OHM 1/10W 5% 0805 R150 R158 R191 R5-8 R50 R73 R108-109 R131 R134 R164-165 0-16-1000...
  • Page 32 A6-UL BOM 2002-09-18 C34-35 C37-39 C41 C44 C47 C50 C58-61 C65 C68 C70-72 C82-85 C88-95 C100 C103 C106 C109 C111-113 C115-122 C136 C138-144 C146-148 C153-154 C156-158 C166 C170-173 C178-179 C181-183 C190-191 C195 C198-200 C205 C212 1-56-0104 CAP 0.1uF X7R 0805 10% 50V C215-216 C218-221 1-56-0220 CAP 22pF NPO 0805 5% 50V...
  • Page 33 A6-UL BOM 2002-09-18 2-62-0138 IC 74AHC138 3-8 DECODER/DEMUX SOP-16 U12 U16-17 2-62-0573 IC 74AHC573 OCTAL D-FF SOP-20 2-62-0574 IC 74AHC574 OCTAL D FF W/TRI-STATE OUTS SOP-20 IC 74HC574 OCTAL D-FF W/ TRI-STATE OUTS SOP-20 U19 U21-23 2-64-0574 2-67-1285 IC SRAM 128K x 8 55ns SOP-32 2-70-8754 IC MPU P87C52UBBB 33MHz OTP QFP-44 2-71-0082...
  • Page 34 A6-UL BOM 2002-09-18 0-16-1000 RES 100 OHM 1/10W 1% 0805 0-16-1001 RES 1.00K OHM 1/10W 1% 0805 R33-34 0-16-1003 RES 100K OHM 1/10W 1% 0805 CAP 10uF ELEC 50V 2x5x7mm C1-4 1-10-1102 1-56-0103 CAP 0.01uF X7R 0805 C5-15 C17-22 C24-27 C29-48 1-56-0471 CAP 470pF CER X7R 0805 50V D8-14 D16 D18 D24 D27-28 D36-42 D49-50 D52...
  • Page 35 A6-UL BOM 2002-09-18 C14-17 C140 C144 C148 C152 C156-157 C160-161 C164-165 C168-169 C172-173 C176-177 C180-181 C184-185 C188-189 C192-193 C196-197 C200-201 C203 C205 C207 C209 C264-269 C272-273 C276- 277 C280-281 C287-288 C291-292 C295-296 C299- 300 C304-305 C308-309 C312-313 C316-317 C321 1-56-0103 CAP 0.01uF X7R 0805 C325 C329 C333 C419 C2 C4 C6 C8-13 C18-23 C38 C41 C44 C47 C49...
  • Page 36 A6-UL BOM 2002-09-18 0-01-1821 RES 1.82K OHM 1/8W 1% 0-01-2612 RES 26.1K OHM 1/8W 1% 0-01-2741 RES 2.74K OHM 1/8W 1% RES 36.5K OHM 1/8W 1% 0-01-3652 0-01-4759 RES 47.5 OHM 1/8W 1% 0-01-7501 RES 7.50K OHM 1/8W 1% 0-01-8251 RES 8.25K OHM 1/8W 1% 0-04-1000 RES 100 OHM 1/4W 1%...
  • Page 37 A6-UL BOM 2002-09-18 7-07-0044 INSULATOR TUBING FRS 18AWG x 7/8" STANDARD WALL R3, R14 7-30-0011 CHOKE COMMON MODE 0.65A 10mH CHOKE ROD OUTPUT 10uH 6A 1"-HIGH L2-4 7-30-0012 7-40-0029 TRANSFORMER FLYBACK ER28L HORIZ-MNT 12-PIN BA02 7-52-0002 STICKER FUSE 2A/250V 0.8" DIA. 9-03-0020 HEATSINK 66.5x25.0x25.0 HS1-2...
  • Page 38 ALESIS ANDROMEDA (A6) SCHEMATIC FILES PCB FILES Confidential Alesis Service Manual 8-31-0089-C...

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