Alesis QS Series Service Manual
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Alesis QS Series Service Manual

Qs series 64 voice keyboards and rack mount synths
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Summary of Contents for Alesis QS Series

  • Page 2: Read This

    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.

  • Page 3: Warnings

    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...

  • Page 4: Safety Suggestions

    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. Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 5: 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 6: Acknowledgments

    (as well as having the final proofreading say). The entire Alesis staff. Let’s face it, without their professionalism and skill, there wouldn’t be any Alesis products for me to write about.

  • Page 7: Table Of Contents

    2.54 H8 UART Clocking .................. 19 3.00 Test Procedures..................20 3.10 Self Tests....................20 3.11 Automated Test Mode ................20 3.12 Individual Test Mode ................20 3.13 Differences In QSR Self Tests ..............21 Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 8 9.20 QS7 Service Parts List................72 9.30 QSR Service Parts List ................76 9.40 QS8 Service Parts List................79 10.00 Appendix E Dictionary Of Selected Terms..........83 11.00 INDEX ......................85 12.00 Schematics....................88 Alesis QS Series Keyboards Service Manual V1.00 11/19/06 viii...
  • Page 9 Table 11 - QS7/8 Main PCB Revision D Changes ..............36 Table 12 - QS7/8 Main PCB Revision E Changes ..............37 Table 13 - QS7/8 Main PCB Revision F Changes............... 37 Table 14 - Schematic Set ......................88 Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 10: General Descriptions

    With the release of the original S5 (later updated to S5+ A.K.A. S9) QuadraSynth keyboard and the S4 (later S4+ or S8), Alesis jumped to the forefront of a field in which it had no previous experience. Since then, we have learned a great deal about the construction of keyboards, as well as the needs of keyboard players in general.

  • Page 11: Figure 1 - Qs6 Simplified Block Diagram

    Figure 1 - QS6 Simplified Block Diagram Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 12: Qs7

    “feel” of real piano keys. In answer to this need, Alesis designed the QS8 88 key, piano weighted keyboard. The keys were specifically designed to simulate the same “feel” that acoustic piano keys have when the hammer strikes the piano strings.

  • Page 13: Figure 2 - Qs7/Qs8 Simplified Block Diagram

    Figure 2 - QS7/QS8 Simplified Block Diagram Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 14: Qsr

    Many current keyboard players already have their favorite controller keyboard, but still desire the great sound provided by the Alesis QS Series. Since multiple keyboards can take up excessive space, the obvious solution is a rack mount sound engine without keys. The QSR is just that solution.

  • Page 15: Figure 3 - Qsr Simplified Block Diagram

    Figure 3 - QSR Simplified Block Diagram Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 16: Theory Of Operation

    2.10 Power Supplies 2.11 QS6/QSR Power Supply The power supply begins with the Alesis P4 type transformer input at J1 J15. After the power switch (SW2 S1), the signal is rectified (D1, D2 D12 D11), input filtered (C3, C9 and C25 C86, C80 and C81), regulated (U9, U10 U31, U32), and finally output filtered (C24, C32 and C35, C34 C77, C78 and C82, C83) into the +5V and -5V supplies needed by the unit.

  • Page 17: Headphone Outputs

    The H8 Microprocessor (U16 U21 U20) is the primary device in control of all information flow in the QS Series. At the appropriate times, the H8 accepts input from various sources (Keyboard, MIDI, etc.) and determines the correct response (play sound, output data to MIDI, etc.).

  • Page 18: A Reset

    The most important pins are: D0-D16 16 Bit Data Buss (note that in the QS Series some of the other devices only use 8 bits of the data buss. This may cause some noise in the unused data lines during processor reads making the appear “bad”...

  • Page 19: B The Gal And Memory Mapped I/O

    This signal is current limited (R1 R45 R53) before being sent to the MIDI Output Jack (J8 J13 J9). In addition, the QS7, QS8, and QSR incorporate a similarly designed MIDI THRU (U9A and U9F U19C and U19D, R45 R55, J14 J10). Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 20: E Pc Serial Connector

    “Keygroup”. Note that the pitch interpolation also takes into account any variations in pitch that may occur due to modulation (i.e. pitch wheel or LFO Modulation). Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 21: B Rom Card Connector

    In the QS Series the Buffer DRAM is in the form of an HM514260AJ-7, a 4 Megabyte 70nS access part arranged as 16 bits X 256K words, for a maximum of approximately 5 seconds of sample time.

  • Page 22: A Reading Velocity

    2.34B QS8 Key Construction Figure 4 - Keyboard Velocity Reponse All keyboards in the QS Series function identically in an electrical sense. However, since the QS8 keyboard is different in mechanical construction from the rest of the line, a word or two about it is appropriate at this point. In order the simulate the action of a true piano keyboard the FATAR TP/20 keyboard uses moving metal weights striking a felt strip to emulate the action of the piano’s hammer striking a string.
  • Page 23 Figure 14. Since the counterweight alone is not enough to force the key up again, a spring located near the key fulcrum is used to push the key back into place. Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 24: Figure 5 - Qs8 Key Construction

    Figure 5 - QS8 Key Construction Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 25: D-A

    2.40 D-A The D-A sections of the QS Series vary slightly from unit to unit. These variations are minor so the circuits are relatively similar, especially on the digital side of the IC. Most of the analog differences depend on the D-A Device used. Both devices are made by AKM and come from the same “family”...

  • Page 26: Qs7/Qs8/Qsr D-A

    In addition, the two different types require different handshake and BAUD rate clock circuitry. Figure 6 shows the pinout of the Alesis QS serial port Figure 6 - Alesis Serial Port Pinout and Tables 1-3 show the pin to pin connections of the various Alesis Serial Cables 1, 2, and 3.

  • Page 27: Qs Serial Input

    The PC version sends and receives a D.C. voltage handshake signal (Enable). The MAC needs to see a bit clock handshake signal which it uses to determine BAUD rate. Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 28: A Qs6/7/8 Pc Serial

    (M2 M2), and the second is a 14MHz clock (M3 M3) intended strictly for this purpose. The ultimate purpose of all of this is to determine how fast the H8’s TXD and RXD lines send and receive data. Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 29: Test Procedures

    3.10 Self Tests The QS Series Software is specifically designed to assist in troubleshooting hardware problems. This assistance comes in the form of a series of self test routines that check various aspects of the hardware.

  • Page 30: Differences In Qsr Self Tests

    8. Test Display - This test simply turns on all of the display elements in the LCD. 9. Test Audio - This test simply sends audio through all outputs. This is extremely useful when troubleshooting analog circuit problems. Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 31: Further Testing

    1 and 2. The audio should be clean and undistorted for the above. In this event, pass the unit. If the unit has a clipping noise after the 48K IN has been turned on, fail the unit. Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 32: Troubleshooting And Repair

    Once the keyboard “clamshell” is open, the technician has instant access to all of the units essential components. The QSR of course uses all of the experience Alesis has gained over the years in making quality rack mount cases. 4.10 QS6/QS7/QS8 Disassembly/Reassembly All of the keyboards use the same “clamshell”...

  • Page 33: Figure 10 - S6 Case Screw Locations

    Figure 10 - S6 Case Screw Locations Figure 11 - QS7QS8 Case Screw Locations Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 34: Qsr Disassembly/Reassembly

    Figure 12 - QSR Case Screw Locations 4.30 Replacing A Whole Keyboard This is the most extensive task that will ever need to be performed to a QS Series keyboard. Fortunately this is a fairly rare occurrence. First the casetop should be removed completely from the unit as described in Section 4.00.

  • Page 35: Replacing Qs6 And Qs7 Keys

    Figure 14 - Key Release Catch Location (nearest the front of the unit) of keyboard mounting screws so that the keyboard can be lifted enough to allow the key to clear the bottom panel assembly. Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 36: General Troubleshooting

    Fault in Baud rate circuitry (See Section 2.54) Sound Card Not Working Faulty Sound Card Bent Connector pins Faulty SG ASIC QS7/QS8 Is Completely Locked Up Incorrect value of C15 (Replace with a 1000µF Electrolytic Capacitor) Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 37: Appendix A Pinout Diagrams

    5.00 Appendix A Pinout Diagrams 5.10 SG ASIC Figure 15 - SG ASIC Pinout 5.11 FX ASIC Figure 16 - FX ASIC Pinout Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 38: Keyscan Asic

    5.12 KEYSCAN ASIC Figure 17 - Keyscan ASIC Pinout 5.13 MICRO CONTROLLER Figure 18 - H8 Processor Pinout Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 39: Sram

    5.14 SRAM Figure 19 - FX SRAM Pinout 5.15 EPROM Figure 20 - EPROM Pinout 5.16 SOUND ROM Figure 21- Sound ROM Pinout Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 40: Gal

    5.19 GAL Figure 22 - GAL Pinout 5.20 DAC Figure 23 - DAC Pinout Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 41: Appendix A Updates And Corrections

    Plate mounting holes, and completely connect to GND plane Move 20Mhz crystal closer to uP Reroute VCO asic area Move 0.1uF caps closer to power on FX and SG asics Use 96 mil drill bit instead of 100mil Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 42: Qs6 Main Revision C

    DATE: 7-1-96 CHANGE: Change all text from Rev D to E Change R25, R24, R28, R27, R6, R7, R9, R10 into 12K Reroute and GND isolate MIDI IN connects Add assy file Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 43: Qs6 Main Revision F

    Add .15" border with breakaway tabs on keyboard side of PCB Add fiducials on breakaway borders Shrink optojack mounting holes to original size Move the extra hole center to the same level as the bottom right mounting hole Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 44: Qs7/8

    Plate mounting holes, and completely connect to GND plane Move 20Mhz crystal closer to uP Reroute VCO asic area Move 0.1uF caps closer to power on FX and SG asics Use 96 mil drill bit instead of 100mil Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 45: Qs7/8 Main Revision C

    Change R25, R24, R28, R27, R6, R7, R9, R10 into 15K "U-connect" all tight pitch pads on uP and DACs Lower R64 silk screen Use New & Improved Fiducials Connect all mounting holes to GND (on the Fly command) Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 46: Qs7/8 Main Revision E

    Add .15" border with breakaway tabs on keyboard side of PCB Add fiducials on breakaway borders Shrink optojack mounting holes to original size Move the extra hole center to the same level as the bottom right mounting hole Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 47: Changes To Qs7/Qs8 Vco Circuit (All Main Pcb Revisions)

    VCO. The solution is to reduce the size of the negative raw supply filter capacitor from 2200µF to 1000µF, hence reducing the amount of charge it can retain on power down. 6.30 QSR There are currently no changes this product. Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 48: Appendix B Software Histories

    QS6 receives a "Change Baud Rate" message, it responds with the new Baud Rate NACK message (#18h). Before, it was sending a Baud Rate ACK message (#17h). 22. Fixed Card Sequence Overrun bug. Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 49: Qs7/Qs8

    PROGRAM XXX then the destination is forced to be EFFECT. 13. Fixed bug in which Mono Mode programs would “stick” if the QSR’s MIDI channel was changed while it was playing. Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 50 Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 51: Appendix C Sys-Ex Implementations

    TRANSMITTED AS There are 400 data bytes sent for a single program dump, which corresponds to 350 bytes of program data. With the header, the total number of bytes transmitted with a Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 52 149. When loading a mix into the mix edit buffer, none of the 16 program edit buffers or the effect buffer will be changed, even if the new mix buffer contains program numbers different than what is currently selected. Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 53 09-MIDI Edit Effects Dump Request F0 00 00 0E 0E 09 <edit#> F7 <edit#> = 0=program mode effect edit; 1=mix mode effect edit When received, the QS6 will respond to this message with a MIDI edit effects dump (08) of the edit effect selected. Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 54 16 program edit buffers or the effect buffer will be changed, even if the new mix buffer contains program numbers different than what is currently selected. Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 55 Additional commands should not be sent until receiving an ACK or NACK (described below) from the QS6. As much as 10 seconds must be allowed before aborting if no ACK or NACK is received. Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 56 This command will cause the QS6 to respond with an opcode 12H (sector write command), with the contents of the sector block that was requested. If there is no card present, the QS6 will respond with an opcode 15H. Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 57 64K byte sectors, must have 150 nanosecond or better chip enable read access time, and must be compatible with the programming commands and Manufacturer’s ID codes of an Am29F040 4-Megabit FLASH memory from AMD. Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 58 The following specific parameter information shows the locations in which each parameter resides after unpacking the data from its 7 bit MIDI format into the 8 bit format as described in opcode 00, program data dump. Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 59 1 (=Mix), the Sound parameter is ignored, and the Channel parameter should be set to 0 through 15, for channels 1 through 16, respectively. Signed parameters should be sent in 2's complement format. Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 60 233-252. Channel 12 parameters (see above) 105:7-98:0 253-272. Channel 13 parameters (see above) 113:7-106:0 273-292. Channel 14 parameters (see above) 121:7-114:0 293-312. Channel 15 parameters (see above) 129:7-122:0 240-332. Channel 16 parameters (see above) 137:7-130:0 Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 61 180-194. Channel 12 parameters (see above) 94:7-88:0 195-209. Channel 13 parameters (see above) 101:7-95:0 210-224. Channel 14 parameters (see above) 108:7-102:0 225-239. Channel 15 parameters (see above) 115:7-107:0 240-254. Channel 16 parameters (see above) 122:7-114:0 Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 62 If a QS6 receives a program with a ROM Identifier of 0, the QS6 will assume the program originated in a QuadraSynth Plus or S4 Plus. The QS6 will then re-map the ROM addresses for this program to be compatible with the QS6. Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 63 Sound mod 5 source 32:2-31:6 Sound mod 5 destination 32:7-32:3 Sound mod 5 amplitude 33:7-33:0 Sound mod 5 gate 34:0 Sound mod 6 source 34:5-34:1 Sound mod 6 destination 35:2-34:6 Sound mod 6 amplitude 36:2-35:3 Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 64 106. Sound amp env sustain pedal 73:1 107. Sound amp env level 74:0-73:2 108. Sound tracking input 74:5-74:1 109. Sound tracking point 0 75:4-74:6 110. Sound tracking point 1 76:3-75:5 111. Sound tracking point 2 77:2-76:4 Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 65 116. Sound tracking point 7 81:5-80:7 117. Sound tracking point 8 82:4-81:6 118. Sound tracking point 9 83:3-82:5 119. Sound tracking point 10 84:2-83:4 120. Sound enable 84:3 121. Drum number (cannot edit) 84:7-84:4 Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 66 (see above) 64:7-57:0 130-145. Drum 9 parameters (see above) 72:7-65:0 146-161. Drum 10 parameters (see above) 80:7-73:0 162. Sound enable 81:0 163. Spare 81:7-81:1 164. Drum number 0-6,8 82:3-82:0 165. Spare 84:7-82:4 Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 67 Spare 11:3-10:5 Spare 12:2-11:4 Send 1 pitch mix 13:1-12:3 If 11= 5 (resonator): Send 1 resonator tuning 10:3-9:5 Spare 10:4 Send 1 resonator decay 11:3-10:5 Spare 12:2-11:4 Send 1 pitch mix 13:1-12:3 Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 68 Send 1 reverb decay 26:2-25:4 Send 1 reverb diffusion 27:1-26:3 Send 1 reverb density 28:0-27:2 Send 1 reverb low decay 28:7-28:1 Send 1 reverb high decay 29:6-29:0 Send 1 reverb mix 30:5-29:7 Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 69 41:2 Send 2 reverb input 2 41:4-41:3 Send 2 reverb balance 42:4-41:5 Send 2 reverb input level 43:3-42:5 PITCH SEND 3: Parameter name Send Func Page Pot Offset Limit bits bit address Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 70 Send 4 reverb input level 58:5-57:7 MODULATION: MIDImod source 1 59:1-58:6 MIDImod destination 1 59:7-59:2 MIDImod level 1 60:7-60:0 MIDImod source 2 61:3-61:0 MIDImod destination 2 62:1-61:4 MIDImod level 2 63:1-62:2 Spare 63:7-63:2 Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 71 Send 3 reverb density 35:3-34:5 Send 3 reverb low decay 36:2-35:4 Send 3 reverb high decay 37:1-36:3 Send 3 reverb mix 38:0-37:2 REVERB SEND 4: Send 4 reverb input level 38:7-38:1 Spare 58:5-39:0 Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 72 Parameters 26 through 88 are identical to configuration 0. * This parameter is stored as 7 bit 2's compliment, with 0 to 6 representing the positive values, and 127 to 122 representing -1 to -6, respectively. Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 73 Hi EQ Gain 46:7-46:4 Spare 58:5-47:0 MODULATION: MIDImod source 1 59:1-58:6 MIDImod destination 1 59:7-59:2 MIDImod level 1 60:7-60:0 MIDImod source 2 61:3-61:0 MIDImod destination 2 62:1-61:4 MIDImod level 2 63:1-62:2 Spare 63:7-63:2 Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 74 Send 1 lezlie input 2 40:6-40:3 Send 1 lezlie input balance 42:4-41:5 Send 1 lezlie speed 38:5 Send 1 lezlie motor 41:2 Send 1 lezlie horn ±6* 40:2-39:4 Send 1 lezlie mix 31:7-31:1 Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 75 Send 1 reverb mix 30:5-29:7 OVERDRIVE SEND 1: Send 1 overdrive type 44:5 Send 1 overdrive balance 48:2-47:3 Send 1 overdrive threshold 50:4-49:6 Send 1 overdrive brightness 49:1-48:3 Send 1 overdrive mix 31:7-31:1 Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 76: Qs7/Qs8//Qsr Sys-Ex

    QS6 Sys-Ex will be the same. Known exceptions are in accessing PCMCIA Card slot 2 and aux audio outputs. This information will be included in future releases of this manual. Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 77: Appendix D Service Parts Lists

    2-11-7805 REG 7805 +5V TO220 NATIONA MAIN 2-11-7905 REG 7905 -5V TO220 NATIONA MAIN 2-24-0138 IC 6N138 OPTO ISO HEWLETT MAIN 2-27-0021 ASIC KEY-SCAN 68-PIN PLCC MAIN AlPartNo Description Qnty Ref.Designator Comments Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 78 REP 8-20-0088 KEY WEIGHTED ‘B’ WHITE S6/S9 REP 8-20-0089 KEY WEIGHTED ‘D’ WHITE S6/S9 AlPartNo Description Qnty Ref.Designator Comments REP 8-20-0090 KEY WEIGHTED ‘A’ WHITE S6/S9 REP 8-20-0091 KEY WEIGHTED ‘G’ WHITE S6/S9 Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 79 Main R25,26,30 SMR 0-15-1470 RES 47 OHM 1/10W 5% 0805 MAIN R12,13 SMR 0-15-1471 RES 470 OHM 1/10W 5% 0805 MAIN R6,22,24,29 SMR 0-15-1472 RES 4.7K OHM 1/10W 5% 0805 MAIN R11,17,19,23,40,53-62,64 Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 80 SWT 6-01-0002 SWITCH SLIDE DPDT MAIN SWT 6-02-0003 SWITCH DPDT SHADOW ITT MAIN Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 81: Qs7 Service Parts List

    (3) EMI FILTER HDW 5-00-1020 SCREW M4 x 10mm PPB "BT" TAPTITE (2) SIDE BRACKETS HDW 5-00-1021 SCREW M3 x 8mm PPB "BT" TAPTITE (6) SIDE COVERS AlPartNo Description Qnty Ref.Designator Comment Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 82 OEM 7-10-0021 PEDAL SUSTAIN S5 (W/BOX) OEM 7-10-0137 GUIDE CARD PCMCIA Q7/Q8/QSR MAIN PLS 9-10-0015 BEZEL SLIDER Q7 AlPartNo Description Qnty Ref.Designator Comment PLS 9-15-0076 FOOT ROUND PLS 9-15-1151 BEZEL WHEEL S6 Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 83 SMI 2-76-4319 IC AKM4319 DAC MAIN U1, U5 SMI 2-77-0044 IC MASK ROM 1 Q7/Q8 MAIN SMI 2-77-0045 IC MASK ROM 2 Q7/Q8 MAIN SMI 2-77-0046 IC MASK ROM 3 Q7/Q8 MAIN Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 84 R38, R50-56, R60, R69, R71, R73, R75, R89, R98-99, R101- SMR 0-10-0821 RES 820 OHM 1/8W 5% 1206 MAIN SOC 4-06-0040 SOCKET 40-PIN DIP 0.6 MAIN (U18) SWT 6-01-0002 SWITCH SLIDE DPDT MAIN SWT 6-03-0001 SWITCH DPST POWER 10A MARQ Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 85: Qsr Service Parts List

    CRYSTAL 20 mHz KDS MAIN ME 7-01-0020 CRYSTAL 7.056 MHZ MAIN ME 7-01-0021 CRYSTAL 14.7456 MHZ MAIN ME 7-05-0003 BATTERY 3V LITHIUM PANASONIC MAIN MIS 7-50-0088 BARCODE S/N QSR Grp AlPartNo Description Qnty Ref.Designator Comment Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 86 IC LM339 ANALOG COMP SMD MAIN SMI 2-76-4319 IC AKM4319 DAC MAIN U2, U4 Grp AlPartNo Description Qnty Ref.Designator Comment SMI 2-77-0044 IC MASK ROM 1 Q7/Q8 MAIN SMI 2-77-0045 IC MASK ROM 2 Q7/Q8 MAIN Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 87 SMR 0-10-0472 RES 4.7K OHM 1/8W 5% 1206 MAIN R43-48, R62, R88-91 SMR 0-10-0821 RES 820 OHM 1/8W 5% 1206 MAIN SOC 4-06-0040 SOCKET 40-PIN DIP 0.6 MAIN SWT 6-02-0002 SWITCH DPDT MAIN Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 88: Qs8 Service Parts List

    HDW 5-00-0512 SCREW M5 x 12mm PPB (11) MOUNTS FATAR KEYBOARD HDW 5-02-6320 NUT KEP 6-32 MAIN (U6) AlPartNo Description Qnty Ref.Designator Comment HDW 5-02-6320 NUT KEP 6-32 (3) EMI FILTER & GND Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 89 PEDAL SUSTAIN S5 (W/BOX) OEM 7-10-0037 KEYBOARD 88-KEY TP-20 WEIGHTED FATAR AlPartNo Description Qnty Ref.Designator Comment OEM 7-10-0137 GUIDE CARD PCMCIA Q7/Q8/QSR MAIN PLS 7-81-0069 FOAM BOTTOM LEFT Q8 PLS 9-10-0015 BEZEL SLIDER Q7 Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 90 SMI 2-76-4319 IC AKM4319 DAC MAIN U1, U5 SMI 2-77-0044 IC MASK ROM 1 Q7/Q8 MAIN SMI 2-77-0045 IC MASK ROM 2 Q7/Q8 MAIN SMI 2-77-0046 IC MASK ROM 3 Q7/Q8 MAIN Alesis QS Series Keyboards Service Manual V1.00 11/19/06...
  • Page 91 R38, R50-56, R60, R69, R71, R73, R75, R89, R98-99, R101-102 SMR 0-10-0821 RES 820 OHM 1/8W 5% 1206 MAIN SOC 4-06-0040 SOCKET 40-PIN DIP 0.6 MAIN (U18) SWT 6-01-0002 SWITCH SLIDE DPDT MAIN SWT 6-03-0001 SWITCH DPST POWER 10A MARQ Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 92: Appendix E Dictionary Of Selected Terms

    Optical In this case it is a reference to the Alesis ADAT fiber optic buss. Designed by Alesis for the ADAT Recording System, this interface allows multiple channels of digital audio to be transmitted and received for unparalleled sonic quality. Note that as audio sources, the QS Series only uses a digital optical out.
  • Page 93 Personal Computer generically. IBM style specifically as used here. PCMCIA Personal Computer Multi Card Interface Adapter. A manufacturer’s standard for computer interfaces. Used by the QS series for RAM and ROM sound cards. Power UP PUP Mute A circuit which eliminates noise during the power up/down cycle when transients of the outputs can cause damage to equipment further along in the audio chain.

  • Page 94: Index

    D3, 8, 10, 41, 46, 69, 74, 81 J8, 8, 10, 12, 72, 75, 79 Alesis, ii, iii, v, vi, 1, 3, 5, 7, 12, 17, 23, 41, 48, 82, 83 D4, 7, 16, 41, 46, 71, 75, 76, 78...
  • Page 95 QS, 22, 23 REV A, 27 U12D, 17 QS Series, ii, 5, 8, 9, 12, 14, 16, 20, 25, 83 reverse bias, 10 QS6, 1, 3, 7, 8, 11, 17, 19, 23, 26, 32, 33, 34, 41, 42, U14, 10, 27, 69, 73, 75, 80...
  • Page 96 U3A, 7 user storage, 7 U3B, 7 X1, 7 U3C, 8 XTAL, 9 U3D, 8 U4, 7, 8, 10, 17, 27, 67, 72, 76, 79 velocity, 11, 13, 22, 53, 54, 56, 83 Alesis QS Series Keyboards Service Manual V1.00 11/19/06...

  • Page 97: Schematics

    12.00 Schematics Note that some revisions are electrically identical to previous versions. In these cases only the pertinent schematics are provided. Any other changes to the PCBs are outlined in Section 6.00. Component I.D.s immediately follow each schematic. Table 14 - Schematic Set Schematic Revision # of Pages...

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