Preface This document is intended to assist the service technician in the operation, maintenance and repair of the QS Series 64 Voice Synthesizer/Controller Keyboards. Together with the User Reference Manuals, this document provides a complete description of the functionality and serviceability of the QS Series. Any comments or suggestions you may have pertaining to the document are welcome and encouraged.
Warnings TO REDUCE THE RISK OF ELECTRIC SHOCK OR FIRE, DO NOT EXPOSE THIS PRODUCT TO WATER OR MOISTURE. CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN 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.
Safety Suggestions 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.
General Troubleshooting While this manual assumes that the reader has a fundamental understanding of electronics and basic troubleshooting techniques, a review of some of the techniques used by our staff may help. ✰ Visual Inspection - A short visual inspection of the unit under test will often yield results without the need of complex signal analysis (burnt, or loose components are a dead giveaway).
Acknowledgments While I get the credit for the whole thing, as with any serious book, there is really a team effort behind it. So this is my opportunity to thank all of those who’s special efforts help me look good. Technicians Joe Reyes, Steve McCain, and Ron Dorsey. Their day to day experience and help with proofreading are an integral part of this effort. Engineers Robert Rampley, and Mike Murphy for their insight and documentation assistance.
Table Of Contents Preface ................................................................................................................ii READ THIS! .........................................................................................................ii Warnings .............................................................................................................iii Safety Suggestions ............................................................................................
3.20 Further Testing .......................................................................................... 22 3.21 Testing 48KHz......................................................................................... 22 4.00 Troubleshooting and Repair ......................................................................23 4.10 QS6/QS7/QS8 Disassembly/Reassembly................................................. 23 4.20 QSR Disassembly/Reassembly.........................................................
List Of Figures Figure 1 - QS6 Simplified Block Diagram......................................................................................2 Figure 2 - QS7/QS8 Simplified Block Diagram..............................................................................4 Figure 3 - QSR Simplified Block Diagram .....................................................................................6 Figure 4 - Keyboard Velocity Reponse ..................................................................................
1.00 General Descriptions The QS series of 64 voice, keyboard and rack mount digital synthesizers represent the current state of the art in high end digital synthesizers. It is certainly recommended that technicians be thoroughly familiar with the operation of the units according to the User’s Reference Manuals before attempting any repair. As is often the case when machines present the user with so many options, many “repairs” can be made simply through education in the correct way to use the product.
Figure 1 - QS6 Simplified Block Diagram Alesis QS Series Keyboards Service Manual V1.
1.20 QS7 The QS7 further expanded and improved the system used in the QS6. The larger QS7 is heavier and therefore less portable, but it’s expanded keyboard enhances it’s use as a master keyboard controller for the studio. Refer to Figure 2 for a simplified view of the QS7’s electronic systems. Note that the QS7 is electrically similar to the QS8 (same Main and Xformer PCBs) and only vary in the number of keys used.
Figure 2 - QS7/QS8 Simplified Block Diagram Alesis QS Series Keyboards Service Manual V1.
1.40 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. Whether used for the road or in the studio, the QSR is a powerful addition to any MIDI setup. Minor improvements have been made through the pre production lifetime of this product.
Figure 3 - QSR Simplified Block Diagram Alesis QS Series Keyboards Service Manual V1.
2.00 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. In addition, many 0.
2.22 Headphone Outputs The signal from the volume slider is sent through a X10 X3 X3 gain stage U5A, U5B U2A, U2B U1B, U1A, current limited R12, R13 R3, R2 R1, R2 and output through the stereo jack J2 J1 J1. 2.23 QS7/QS8/QSR Aux Outputs The Aux outputs are completely isolated from the main outputs by virtue of a separate DAC U3 U4. The differential output of the DAC is anti-alias filtered and buffered by U3C U3C (left) and U3D U3D (right). This signal is current limited (R31, R32 R31, R32), R.F.
shows that knowing how the hardware is supposed to respond to software changes can greatly simplify the task of hardware troubleshooting. 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” due to a floating input.
It helps to know the initial state of the active devices in the circuit. While the raw supply is just below the raw supply threshold Q5 Q5 Q5 is turned off, allowing the base of Q6 Q6 Q6 to be pulled high via R40 R38 R62 , turning it on. This in turn holds the voltage across C15 C42 C59 at 0.7V (approximately ground). These in turn keeps the input to the first inverter U7A U9C U19A low. Thus RST is high and RST is low.
For further information about MIDI, consult MIDI SPEC available from the International MIDI Association. 2.31E PC Serial Connector While technically a part of standard H8 I/O, Computer Serial I/O is complex enough to warrant it’s own section (See Section 2.50). 2.32 The SG ASIC In order for the unit to play a sound sample, the H8 µP (See Section 2.31B) must receive a command via the keyboard (via the Keyscan ASIC) or through MIDI. The Microprocessor then tells the SG ASIC three things: 1.
Once pitch scaling is done, the SG ASIC similarly scales the amplitude of the data. Again it must take into account such things as the sample’s natural envelope, the Attack/Decay/Sustain/Release envelope provided for in the patch by the user, and any other modulations necessary. The “massaged” data is now ready to be passed along to the FX ASIC for further processing and output. (See Sections 2.33, 2.40, and 2.20) 2.
➫ DD0-DD7 ➫ ➫ ➫ ➫ ➫ ➫ ➫ ➫ ➫ ➫ A0 RD WR KEY KEYINT KEYCLK ROW0-7 COL0-21 VSS1-4 VDD1-4 Data Buss bits 0 to 7. Correspond to the upper 8 data bits of the H8. H8 Address Buss bit 0 H8 ReaD enable H8 WRite enable Chip select line from GAL (Mapped I/O) Output to H8 interrupt line Clock input from H8 Row input from keyboard switch matrix Column input from keyboard switch matrix Source Supply (GND) Drain Supply (+5V) 2.
fulcrum offset from center to increase the relative momentum of the weight, it is pushed on one end by the motion of the key. The other end of the counterweight is free to move until it strikes the felt strip attached to the frame (i.e. the hammer hits the string). The individual keys are isolated from the frame by a plastic clip. Individual broken keys are easily replaced by releasing the clip as shown in Figure 14.
Figure 5 - QS8 Key Construction Alesis QS Series Keyboards Service Manual V1.
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” (43XX Series). The main differences between the two are in the power supply filtering required by these two devices.
2.42 QS7/QS8/QSR D-A The QS7/8/R Digital-to-Analog Converter is an AKM4319 (U3 U2). A bit clock (BICK) of 3.072 MHz, buffered by a NAND gate acting as an inverter (U12D U10D), is sent from the FX ASIC (U10 U6). This clock signal is sent to pin 5 of the DAC which is used to latch the serial data on SDATA (pin 6) into the device. The LRCK (pin 4) input is the left and right channel clock. This 48KHz clock signal is originated from the FX ASIC at pin 11.
Table 2 - Pin to Pin Connections for 25 Pin PC Serial to QS Purpose HSKO (Enable 4-12V) Return (Enable Return) TXD GND RXD NC NC NC QS Serial Pin 1 2 3 4 5 6 7 8 PC Pin 5 4 3 7 2 NC NC NC Table 3 - Pin to Pin Connections for MAC Serial to QS Purpose 1MHz NC TXD GND RXDTXD+ GPI (NC) RXD+ QS Serial Pin 1 2 3 4 5 6 7 8 MAC Pin 2 1 5 4 3 8 7 6 2.51 QS Serial Input PC/MAC input is passed through a buffer/translation stage consisting of U2A U31C U24C and some resistors.
2.53A QS6/7/8 PC Serial In these units the Enable handshake signal is provided by simply closing the loop provided by the host computer (Enable Return) via the DPDT PC/MAC switch (SW1 SW1). The switch also is used to inform the H8 that the PC type is currently in use and should adjust the software and/or hardware accordingly. The BAUD rate is determined by the FREQ input to the H8 (See Section 2.54). In the QS6, handshake hardware is fixed at 614.
3.00 Test Procedures If at all possible, user memory should always be saved (PCMCIA Card or MIDI SYS-EX) prior to service. It’s also important to remember that user data itself may be corrupted for a variety of reasons. So if for some reason a unit continues to “crash” when reloaded, it’s not unreasonable to expect bad data to be the cause. 3.10 Self Tests The QS Series Software is specifically designed to assist in troubleshooting hardware problems.
5. 6. 7. 8. circuit, failures should be relatively easy to troubleshoot although failures with the BUAD rate circuitry can also affect serial operation. TEST F/X DRAM - This routine forces the F/X ASIC to write to and read from every location in the F/X DRAM. This will take about 40 seconds.
3.20 Further Testing Naturally it is a good idea to actually play the keyboard. Be sure to check that pitch and velocity scaling sound normal. It’s also important to check the Aftertouch to ensure it’s function. Note that in the QS8 it is important to check the Aftertouch of white and black keys separately as each of these key sets has it’s own Aftertouch cable. While the self test will pick up most circuit errors, MIDI should still be tested in both send and receive.
Note: If the QS's power is turned off, the 48K IN must be turned on again. The display may show that the 48K IN is on, but it MUST be toggled back to ON to get it to work 4.00 Troubleshooting and Repair With the release of the original QuadraSynth keyboard, Alesis engineers and technicians began a heavy learning curve into what works and what doesn’t in keyboard design. Because of this experience, it’s descendants are not only extremely stable designs but also very easy to troubleshoot and repair.
Figure 10 - S6 Case Screw Locations Figure 11 - QS7QS8 Case Screw Locations Alesis QS Series Keyboards Service Manual V1.
4.20 QSR Disassembly/Reassembly Figure 12 shows the location of the top panel screws. While this gives access to the top of the PCB and is adequate for simple repairs, serious troubleshooting will require the removal of the main PCB from the frame. Unscrewing the last 3 case screws on the bottom releases the front panel and the rack ear/side panels from the frame. Finally the nuts are removed from the cliff jacks to release the PCB from the frame. Reassembly is essentially the reverse process.
4.51 Replacing QS6 And QS7 Keys Figure 13 shows the location of the spring which must be removed before removing the key itself. It also shows the location of the key clip release catch. Insert a flat blade screwdriver into the slot. While turning the screwdriver to release the catch, lift carefully at the rear of the key. DO NOT force the key off or it’s possible to break the key clip itself, and ruining the entire keyboard.
4.60 General Troubleshooting The following table was generated from previous troubleshooting cases. The cause section does not guaranteed a solution. The purpose of this table is to assist a technician in understanding why certain problems occur. PROBLEM LCD Blank except for one cursor. LCD fully light. No numbers are displayed in MIX mode. CAUSE Pin 61 of the F/X ASIC unsoldered. LCD ribbon cable is backwards. Edit buffers are empty. Select a new mix to establish the edit buffers.
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.
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.
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.
5.19 GAL Figure 22 - GAL Pinout 5.20 DAC Figure 23 - DAC Pinout Alesis QS Series Keyboards Service Manual V1.
6.00 Appendix A Updates And Corrections 6.10 QS6 The QS6 has undergone numerous changes in order to improve it’s performance. Each new revision incorporates all hardware modifications necessary from previous versions. The fact that this unit has been around for a while has also allowed for the creation of more extensive documentation than is available for more recent units. This comes in the form of precise engineering notes of all main P.C. Board changes.
6.12 QS6 Main Revision C Table 5 - QS6 Main PCB Revision C Changes PART NUMBER: 9-40-1241 QS7/QS8 MAIN CHANGES FROM REV: B TO REV: C DATE: 5-7-96 CHANGE: Change all text from Rev B to C Move R88, R92, & C88 farther above central mounting hole Tie both A.T.
6.15 QS6 Main Revision F Table 8 - QS6 Main PCB Revision F Changes PART NUMBER: 9-40-1241 CHANGES FROM REV: E TO F REV: DATE: 7-22-96 Borders added to PCB at production's request. Now, many back panel parts become waveable. Because of new waving technology, the audio jacks can be waved without harm or corrosion. Rev.E and Rev.F are electrically the same.
6.20 QS7/8 6.21 QS7/8 Main Revision B Table 9 - QS7/8 Main PCB Revision B Changes PART NUMBER: 9-40-1241 CHANGES FROM REV: A TO REV: B DATE: 4/15/96 CHANGE: Change all text from Rev A to B Reroute 3.072Mhz signal Add GND bar along back panel Put GND vias under DACs Update power diode part Remove redundant REV.A labels Move A.T.
6.22 QS7/8 Main Revision C Table 10 - QS7/8 Main PCB Revision C Changes PART NUMBER: 9-40-1241 QS7/QS8 MAIN CHANGES FROM REV: B TO REV: C DATE: 5-7-96 CHANGE: Change all text from Rev B to C Move R88, R92, & C88 farther above central mounting hole Tie both A.T.
6.24 QS7/8 Main Revision E Table 12 - QS7/8 Main PCB Revision E Changes PART NUMBER: 9-40-1241 CHANGES FROM REV: D TO REV: E 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 6.25 QS7/8 Main Revision F Table 13 - QS7/8 Main PCB Revision F Changes PART NUMBER: 9-40-1241 CHANGES FROM REV: E TO REV: F DATE: 7-22-96 Borders added to PCB at production's request.
6.25 Changes To QS7/QS8 VCO Circuit (All Main PCB Revisions) It was found that the Digital VCO could lock up if a slight negative voltage was present on the +5V line prior to power up. While this sounds unusual, it happens! Unfortunately, it wasn’t our first guess. Originally it was thought that reducing the amount of negative voltage at the control voltage input was enough. This was done by soldering a 120K bleeder resistor in parallel with C43.
7.00 Appendix B Software Histories 7.10 QS6 V1.00 September 11th, 1995 Checksum: BB68H 1. First Production Release version 1.00! V1.10 October 25th, 1995 Checksum: D3A4H 1. Changed program changing so that the DAC is muted on program changes which use the distortion algorithm, program changes with different configurations, and program changes with the same algorithm but with different reverb types. 2. Changed version number and date for official 1.10 release.
7.20 QS7/QS8 1.00 June 28, 1996 _________________ 1. First Production Release. 1.01 July 3, 1996 _________________ 1. Lowered test sine wave amplitude by 2dB. V1.10 Sep. 11th, 1996 1. Fixed Mix UnCompare bug where when going out of compare in Mix mode all voices playing should be stopped, but they weren't. 2. Fixed Mix MIDI Dots bug where when leaving Edit mode by hitting the button, no new MIDI Dots would light when a new key was pressed until all keys were first released. 3.
Alesis QS Series Keyboards Service Manual V1.
8.00 Appendix C Sys-Ex Implementations 8.10 S6 Sys-Ex SYSTEM EXCLUSIVE FORMAT 4/15/95 The QS6 MIDI System Exclusive message format is as follows: F0 00 00 0E 0E cc dd : : F7 System exclusive status Alesis manufacturer id# QS id# Opcode Data : : End-Of-Exclusive OPCODES: 00-MIDI User Program Dump F0 00 00 0E 0E 00 F7 = 0..127 selects individual user programs is in a packed format in order to optimize data transfer.
program dump is 408. The location of each parameter within a program dump is shown in the next section. 01-MIDI User Program Dump Request F0 00 00 0E 0E 01 F7 = 0..127 selects individual user programs When received, the QS6 will respond to this message with a MIDI user program dump (00) of the program number selected.
05-MIDI Old Mix Dump Request F0 00 00 0E 0E 05 F7 = 0..99 selects individual user mixes; 100=mix edit buffer When received, the QS6 will respond to this message with a MIDI Old Mix dump (04) of the mix selected. It is recommended that the New Mix Dump Request be used instead (0F), since it adds additional Mix parameters into its format. 06-MIDI User Effects Dump F0 00 00 0E 0E 06 F7 = 0..
0A-MIDI Global Data Dump F0 00 00 0E 0E 0A 00 F7 is in the same format as described in 00, but with a different number of bytes due to the difference in the global parameter size. The total number of data bytes sent for a global data dump is 23, which corresponds to 20 bytes of global data. With the header, the total number of bytes transmitted with a program dump is 31. Note that with version prior to 2.
0F-MIDI New Mix Dump Request F0 00 00 0E 0E 0F F7 = 0..99 selects individual user mixes; 100=mix edit buffer When received, the QS6 will respond to this message with a MIDI New Mix dump (0E) of the mix selected.
12- Sector Write Command F0 00 00 0E 0E 12 F7 = 0..63 selects 128K byte sector number to be written in FLASH PCMCIA card = 0..127 selects 1024 byte block of data to be written in FLASH PCMCIA card = 0..127 seven bit checksum of previous 1173 bytes. is in a packed format in order to optimize data transfer. Eight MIDI bytes are used to transmit each block of 7 FLASH card data bytes.
14-FLASH Command ACK Response F0 00 00 0E 0E 14 F7 This command is ignored if received by the QS6. It is sent out by the QS6 after completing an erase command, or receiving a complete sector block write command. 15-FLASH Command NACK Response F0 00 00 0E 0E 15 F7 = 0..
DEVICE INQUIRY The QS6 responds to the Universal Device Inquiry message < F0 7E 7F 06 01 F7 > Upon receiving this message the QS6 will respond with the following: F0 7E 7F 06 02 00 00 0E 0E 00 03 00 xx xx xx xx F7 Universal Device Reply Alesis Manufacturer ID QS Family ID, LSB first QS6 Family Member, LSB first Software revision, ASCI (ex. 30 31 30 30 = '0100' = 1.
GLOBAL DATA FORMAT The Global parameters are comprised of 19 bytes of data. Unlike the Program, Mix, and Effects parameters, the Global parameters are not packed into each available bit, so that each parameter occupies its own byte. This results in unused bits for most of the parameter's bytes. These bits must remain at 0. In addition, the signed parameters are kept in 2's compliment format, so no offset adjustment is necessary.
# Parameter name Func Page Pot Offset 0. Mix effect MIDI program change 5 0 2 0 1. Mix effect chan 5 0 3 0 2. Mix name digit 0 6 0 0 0 3. Mix name digit 1 6 1 0 0 4. Mix name digit 2 6 2 0 0 5. Mix name digit 3 6 3 0 0 6. Mix name digit 4 6 4 0 0 7. Mix name digit 5 6 5 0 0 8. Mix name digit 6 6 6 0 0 9. Mix name digit 7 6 7 0 0 10. Mix name digit 8 6 8 0 0 11. Mix name digit 9 6 9 0 0 12. Mix spare 13. Channel 1 program number 0 0 0 0 14. Channel 1 program type 0 0 2 0 15. Channel 1 enable 0 0 3 0 16.
OLD MIX DATA FORMAT This format exists for compatibility with QSs having software prior to version 2.00. It is presented here for reference, and can only be used for old mix data dumps or requests (no direct editing). When receiving this data Old Mixes contain 123 bytes of packed parameter data. The first 11 bytes are common parameters for all 16 MIDI channels. The next 16 sets of 7 bytes contain each of the channel's parameters.
PROGRAM DATA FORMAT Programs contain 350 bytes of packed parameter data. The first 10 bytes are common parameters for all four sounds. The next four sets of 85 bytes contain each of the four sound's parameters. The least significant bit of the first byte of each sound determines if it is a keyboard sound or a drum sound. The parameter definitions of the remaining bits of the first byte as well as the remaining 84 bytes of the sound are determined by this bit.
Keyboard Sound: # 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. 37. 38. 39. 40. 41. 42. 43. 44. 45. 46. # 47. 48. 49. 50. 51. 52. 53.
54. 55. 56. 57. 58. 59. 60. 61. 62. 63. 64. 65. 66. 67. 68. 69. 70. 71. 72. 73. 74. 75. 76. 77. 78. 79. 80. 81. 82. 83. 84. 85. 86. 87. 88. 89. 90. 91. 92. 93. 94. 95. 96. 97. 98. 99. 100. 101. # 102. 103. 104. 105. 106. 107. 108. 109. 110. 111.
112. 113. 114. 115. 116. 117. 118. 119. 120. 121. Sound tracking point 3 Sound tracking point 4 Sound tracking point 5 Sound tracking point 6 Sound tracking point 7 Sound tracking point 8 Sound tracking point 9 Sound tracking point 10 Sound enable Drum number 15 1 0 15 1 1 15 1 2 15 1 3 15 2 0 15 2 1 15 2 2 15 2 3 16 0 3 (cannot edit) Alesis QS Series Keyboards Service Manual V1.
Drum Sound: # 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18-33. 34-49. 50-65. 66-81. 82-97. 98-113. 114-129. 130-145. 146-161. 162. 163. 164. 165.
EFFECT DATA FORMAT Effects contain 64 bytes of packed parameter data. The first 11 bytes are common parameters for all three configurations. The first 10 exist for compatibility with older software, and are always sent as zeroes. The bit addresses shown are from most significant bit to least significant bit for each parameter, with the byte number first, followed by a colon (:), followed by the bit number. Each parameter should never exceed the limit shown in the table.
DELAY SEND 1: # Parameter name 17. Send 1 delay type 18. Send 1 delay input If 17=0 (mono delay): 19. Send 1 delay 10ms 20. Send 1 delay 1ms 21. Spare 22. Spare 23. Send 1 delay feedback 24. Spare 25. Send 1 delay mix If 17=1 (stereo delay): 19. Send 1 left delay 10ms 20. Send 1 left delay 1ms 21. Send 1 right delay 10ms 22. Send 1 right delay 1ms 23. Send 1 left delay feedback 24. Send 1 right delay feedback 25. Send 1 delay mix If 17=2 (ping-pong delay): 19. Send 1 delay 10ms 20. Send 1 delay 1ms 21.
PITCH SEND 2: # Parameter name 41. Send 2 pitch type If 41= 0 thru 3 (chorus and flange): 42. Send 2 pitch speed 43. Send 2 pitch shape 44. Send 2 pitch depth 45. Send 2 pitch feedback 46. Send 2 pitch mix If 41= 4 (pitch detune): 42. Send 2 pitch detune 43. Spare 44. Spare 45. Spare 46. Send 2 pitch mix If 41= 5 (resonator): 42. Send 2 resonator tuning 43. Spare 44. Send 2 resonator decay 45. Spare 46. Send 2 pitch mix DELAY SEND 2: 47. Send 2 delay type 48. Send 2 delay input If 47=0 (mono delay): 49.
61. Send 3 pitch type If 61 = 0 or 1 (chorus and flange): 62. Send 3 pitch speed 63. Send 3 pitch shape 64. Send 3 pitch depth 65. Send 3 pitch feedback 66. Send3 pitch mix If 61 = 2 (resonator): 62. Send 3 resonator tuning 63. Spare 64. Send 3 resonator decay 65. Spare 66.
Configuration 1 (4-sends, 2 reverb): # Parameter name DELAY SEND 1: 11. Send 1 delay 10ms 12. Send 1 delay 1ms 13. Send 1 delay feedback 14. Send 1 delay mix Send Func Page Pot Offset Limit bits bit address 0 0 0 0 4 4 4 5 0 0 0 0 1 2 3 0 0 0 0 0 119 9 99 99 7 4 7 7 10:0-9:2 10:4-10:1 11:3-10:5 12:2-11:4 PITCH SEND 1: 15. Pitch input level 16. Send 1 pitch type 17. Send 1 pitch speed 18. Send 1 pitch shape 19. Send 1 pitch depth 20.
MODULATION: # Parameter name 51. MIDImod source 1 52. MIDImod destination 1 53. MIDImod level 1 54. MIDImod source 2 55. MIDImod destination 2 56. MIDImod level 2 57. Spare Send Func Page Pot x 1 0 0 x 1 0 1 x 1 0 2 x 1 1 0 x 1 1 1 x 1 1 2 Offset Limit bits 0 10 4 0 36 6 -99 198 8 0 10 4 0 36 6 -99 198 8 bit address 59:1-58:6 59:7-59:2 60:7-60:0 61:3-61:0 62:1-61:4 63:1-62:2 63:7-63:2 Offset Limit bit address Configuration 2 (4-sends, 1 lezlie): # Parameter name PITCH SEND 1: 11. Spare 12.
Configuration 3 (2-sends, with EQ): # Parameter name Send Func Page Pot Offset Limit PITCH SEND 1: Parameters 11 through 16 are identical to configuration 0. bits bit address DELAY SEND 1: Parameters 17 through 25 are identical to configuration 0. REVERB SEND 1: Parameters 26 through 40 are identical to configuration 0. PITCH SEND 2: Parameters 41 through 46 are identical to configuration 0. DELAY SEND 2: Parameters 47 through 56 are identical to configuration 0. REVERB SEND 2: 57.
Configuration 4 (Overdrive, Chorus, Delay, Reverb, Lezlie): # Parameter name PITCH SEND 1: 11. Send 1 pitch type 12. Spare 13. Send 1 pitch input 2 14. Send 1 pitch input balance If 11= 0 thru 1 (chorus and flange): 13. Send 1 pitch speed 14. Send 1 pitch shape 15. Send 1 pitch depth 16. Send 1 pitch feedback 17. Send 1 pitch mix If 11= 2 (resonator): 13. Send 1 resonator tuning 14. Spare 15. Send 1 resonator decay 16. Spare 17. Send 1 pitch mix LEZLIE SEND 1: 18. Send 1 lezlie input 1 19.
DELAY SEND 1: # Parameter name 25. Send 1 delay type 26. Send 1 delay input balance 27. Send 1 delay input 2 If 25=0 (mono delay): 28. Send 1 delay 10ms 29. Send 1 delay 1ms 30. Spare 31. Spare 32. Send 1 delay feedback 33. Spare 34. Send 1 delay mix If 25=1 (stereo delay): 28. Send 1 left delay 10ms 29. Send 1 left delay 1ms 30. Send 1 right delay 10ms 31. Send 1 right delay 1ms 32. Send 1 left delay feedback 33. Send 1 right delay feedback 34. Send 1 delay mix If 25=2 (ping-pong delay): 28.
EQUALIZER: # Parameter name 61. Low EQ Frequency 62. Low EQ Gain 63. Hi EQ Frequency 64. Hi EQ Gain MODULATION: 82. MIDImod source 1 83. MIDImod destination 1 84. MIDImod level 1 85. MIDImod source 2 86. MIDImod destination 2 87. MIDImod level 2 88.
9.00 Appendix D Service Parts Lists 9.
IC IC JAC JAC JAC JAC LCD LIT LIT LIT LIT ME ME ME ME MIS MIS 2-27-0022 2-31-0048 4-00-0001 4-00-0004 4-02-0001 4-03-0001 9-44-1602 7-51-1091 7-51-1092 7-51-1173 7-51-1174 7-01-0005 7-01-0007 7-01-0017 7-05-0003 7-13-0084 7-51-1216 MTL MTL MTL MTL MTL MTL MTL MTL MTL OEM OEM PLS PLS PLS PLS PLS PLS PLS PLS PLS PLS PLS PLS POT POT POT REP REP REP Grp REP REP 9-01-1039 9-01-1040 9-03-1126 9-03-1127 9-03-1128 9-03-1132 9-03-1133 9-03-1134 9-06-0008 7-10-0021 7-10-0022 9-15-0076 9-15-1150 9-15-1151 9-15-1152
REP REP REP REP REP RES RES RUB RUB SMC SMC SMC SMC 8-20-0092 8-20-0093 8-20-0094 8-20-0095 8-20-0096 0-00-0102 0-09-1038 9-23-1028 9-23-1031 1-55-0022 1-55-0220 1-56-0562 1-57-0104 KEY WEIGHTED ‘B’ WHITE S6/S9 KEY WEIGHTED ‘F’ WHITE S6/S9 KEY WEIGHTED BLACK S6/S9 KEY WEIGHTED ‘E’ HIGH END WHITE S6/S9 KEY WEIGHTED ‘G’ WHITE S6/S9 RES 1K OHM 1/8W 5% RES SLIDER 10KB 45mm MONO KEYPAD EDIT S6 KEYPAD RUBBER SELECT (W/ S6 SILKSCREEN) CAP 22PF XQSR 0805 CAP 220PF NPO 0805 CAP 5600PF XQSR 0805 CAP 0.
SWT 6-01-0002 SWT 6-02-0003 SWITCH SLIDE DPDT SWITCH DPDT SHADOW ITT Alesis QS Series Keyboards Service Manual V1.
9.
HDW HDW HDW HDW HDW HDW IC IC IC IC IC IC JAC JAC JAC LCD LIT LIT LIT LIT ME ME ME ME ME ME MIS MIS MIS MIS MIS MIS MIS MTL MTL MTL MTL MTL MTL MTL MTL MTL MTL OEM OEM OEM PLS Grp PLS PLS 5-00-1632 5-02-6320 5-02-6320 5-04-1007 5-05-1001 5-10-1004 2-11-7805 2-11-7905 2-24-0138 2-27-0021 2-27-0022 2-31-0069 4-00-0001 4-02-0001 4-03-0001 9-44-1602 7-51-1198 7-52-0009 7-52-0010 7-52-0011 4-09-0006 7-01-0005 7-01-0020 7-01-0021 7-05-0003 7-40-2700 7-07-0017 7-13-0001 7-13-0084 7-50-0074 7-51-1216 7-53-0018 7-5
PLS PLS PLS PLS PLS PLS PLS POT POT POT REP REP REP REP REP REP REP REP REP REP RES RES RUB RUB SMC 9-15-1152 9-15-1152 9-15-1154 9-15-1155 9-15-1157 9-15-1179 9-15-1227 0-09-1034 0-09-1106 0-09-1124 8-20-0087 8-20-0088 8-20-0089 8-20-0090 8-20-0091 8-20-0092 8-20-0093 8-20-0094 8-20-0095 8-20-0096 0-00-0000 0-09-1038 9-23-1028 9-23-1031 1-50-0104 WHEEL PITCH & MOD S6 WHEEL PITCH & MOD S6 BRACKET RETAINER LCD S6 PANEL LEFT S6 PANEL RIGHT S6 CAP FADER BLACK (NO STRIPE) BEZEL LCD Q7/Q8 POT 1KA STEREO SLIDE
SMI SMI SMI SMI SMI SMM SMM SMM SMR SMR 2-77-0047 2-77-0048 2-77-0049 2-77-0050 2-77-0051 2-50-4148 2-51-4401 2-51-4403 0-10-0101 0-10-0102 IC MASK ROM 4 Q7/Q8 IC MASK ROM 5 Q7/Q8 IC MASK ROM 6 Q7/Q8 IC MASK ROM 7 Q7/Q8 IC MASK ROM 8 Q7/Q8 DIODE SIGNAL LS4148 SMD TRANS 2N4401 NPN SMD TRANS 2N4403 PNP SMD RES 100 OHM 1/8W 5% 1206 RES 1K OHM 1/8W 5% 1206 1 1 1 1 1 12 4 2 1 21 MAIN MAIN MAIN MAIN MAIN MAIN MAIN MAIN MAIN MAIN SMR SMR SMR SMR SMR SMR SMR SMR SMR SMR SMR SMR SMR SMR 0-10-0103 0-10-0105 0-1
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MIS MIS MIS MIS MIS MTL MTL MTL MTL MTL MTL MTL OEM PLS PLS PLS PLS PLS PLS PLS PLS PLS PLS POT RES RES SMC 7-51-1216 7-53-0018 9-00-1011 9-23-1014 9-23-1017 9-03-1036 9-03-1100 9-03-1132 9-03-1165 9-03-1181 9-03-1182 9-58-1007 7-10-0137 9-10-0003 9-13-0020 9-13-0130 9-15-0087 9-15-1078 9-15-1112 9-15-1117 9-15-1311 9-15-1312 9-15-1316 0-09-1022 0-00-0221 0-05-0200 1-50-0104 COMPACT-DISC SOFTWARE MIDI/PATCH S6/Q7/Q8/QSR STICKER QC W/ MFR DATE (UL APPROVED) ENCODER DATA 15mm (ALPS EC11B w/o SWITCH) STRIP F
SMI SMI SMI SMI SMI SMI SMM SMM SMM SMR SMR SMR SMR SMR SMR SMR SMR SMR SMR SMR SMR SMR SMR SMR SMR SMR SMR SOC SWT 2-77-0046 2-77-0047 2-77-0048 2-77-0049 2-77-0050 2-77-0051 2-50-4148 2-51-4401 2-51-4403 0-10-0000 0-10-0101 0-10-0102 0-10-0103 0-10-0105 0-10-0121 0-10-0123 0-10-0150 0-10-0153 0-10-0202 0-10-0203 0-10-0221 0-10-0332 0-10-0333 0-10-0362 0-10-0471 0-10-0472 0-10-0821 4-06-0040 6-02-0002 IC MASK ROM 3 Q7/Q8 IC MASK ROM 4 Q7/Q8 IC MASK ROM 5 Q7/Q8 IC MASK ROM 6 Q7/Q8 IC MASK ROM 7 Q7/Q8 IC M
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HDW HDW HDW HDW HDW IC IC IC IC IC IC JAC JAC JAC LCD LIT LIT LIT LIT ME ME ME ME ME ME MIS MIS MIS MTL MTL MTL MTL MTL MTL MTL MTL MTL MTL MTL MTL MTL MTL MTL MTL OEM OEM Grp OEM PLS PLS 5-04-1007 5-05-1001 5-10-1004 9-04-0004 9-04-0005 2-11-7805 2-11-7905 2-24-0138 2-27-0021 2-27-0022 2-31-0071 4-00-0001 4-02-0001 4-03-0001 9-44-1602 7-51-1198 7-52-0009 7-52-0010 7-52-0011 4-09-0006 7-01-0005 7-01-0020 7-01-0021 7-05-0003 7-40-2700 7-07-0017 7-07-0027 7-13-0084 9-03-1126 9-03-1127 9-03-1132 9-03-1220 9-0
PLS PLS PLS PLS PLS PLS POT POT POT REP REP REP REP REP REP REP REP REP REP RES RES RUB RUB RUB SMC 9-15-0076 9-15-1151 9-15-1152 9-15-1154 9-15-1179 9-15-1227 0-09-1034 0-09-1106 0-09-1124 8-20-0099 8-20-0102 8-20-0103 8-20-0104 8-20-0105 8-20-0106 8-20-0107 8-20-0108 8-20-0109 8-20-0110 0-00-0000 0-09-1038 9-23-1028 9-23-1031 9-23-1072 1-50-0104 FOOT ROUND BEZEL WHEEL S6 WHEEL PITCH & MOD S6 BRACKET RETAINER LCD S6 CAP FADER BLACK (NO STRIPE) BEZEL LCD Q7/Q8 POT 1KA STEREO SLIDE 45mm POT 10KB SINGLE CON
SMI SMI SMI SMI SMI SMM SMM SMM SMR SMR 2-77-0047 2-77-0048 2-77-0049 2-77-0050 2-77-0051 2-50-4148 2-51-4401 2-51-4403 0-10-0101 0-10-0102 IC MASK ROM 4 Q7/Q8 IC MASK ROM 5 Q7/Q8 IC MASK ROM 6 Q7/Q8 IC MASK ROM 7 Q7/Q8 IC MASK ROM 8 Q7/Q8 DIODE SIGNAL LS4148 SMD TRANS 2N4401 NPN SMD TRANS 2N4403 PNP SMD RES 100 OHM 1/8W 5% 1206 RES 1K OHM 1/8W 5% 1206 1 1 1 1 1 12 4 2 1 21 MAIN MAIN MAIN MAIN MAIN MAIN MAIN MAIN MAIN MAIN SMR SMR SMR SMR SMR SMR SMR SMR SMR SMR SMR SMR SMR SMR SMR SOC SWT SWT 0-10-01
10.00 Appendix E Dictionary Of Selected Terms 48KHz Normally running at 48Khz, however, this usually is in reference to the system sample rate clock and may change to accommodate variable pitch.. A.K.A. Also Known As Alias An unwanted byproduct of digital audio, aliasing really describes two separate phenomenon. Amplitude aliasing occurs due to the fact that digital audio is not smooth, but stored as a series of quantized values.
PC 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. PUP 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.
11.00 INDEX + +5V, 7, 9, 10, 13, 16, 17, 18, 38, 67, 72, 75, 79 0 0.1(F capacitors, 7 ¼ ¼, 8 1 12.288MHz, 11, 32, 35 14MHz, 19 1MHz, 11, 18 2 20MHz, 19, 32, 35 3 3.072 MHz, 16, 17 38.4 KHz, 17 4 48KHz, 16, 17, 22, 47, 82 5 -5V, 7, 38, 67, 72, 75, 79 6 614.4KHz, 19 614.
Memory Mapped, 10, 11, 12 Memory mapping, 10 microprocessor, v, 8, 10, 11, 27, 82 MIDI, 5, 8, 9, 10, 11, 17, 20, 21, 22, 27, 33, 34, 36, 37, 41, 42, 43, 44, 45, 46, 48, 49, 50, 51, 68, 72, 75, 76, 79, 82, 83 MIX, 11, 27, 42, 43, 44, 45, 49, 50, 51, 52, 57, 58, 59, 60, 61, 62, 64, 65, 68, 72, 79 MOD, 9, 10, 21, 53, 54, 56, 68, 72, 73, 78, 79, 80 modulation, 12, 60, 62, 63, 66, 67, 68, 71, 72, 79 Moisture, iii, iv multiple resets, 10 mute, 8, 9, 10, 56, 83 Muting, 8 N negative, 8, 38, 83 noise, v, 8, 9, 16,
U25C, 19 U26, 19, 73, 76, 80 U26A, 19 U26C, 19 U27, 19, 74, 76, 81 U28, 19, 73, 76, 80 U29A, 19 U2A, 8, 18 U2B, 8, 19 U2C, 18 U2D, 18 U3, 8, 16, 17, 69, 73, 76, 80 U31, 7, 73, 75, 80 U31A, 18 U31B, 18 U31C, 18 U32, 7, 72, 75, 79 U3A, 7 U3B, 7 U3C, 8 U3D, 8 U4, 7, 8, 10, 17, 27, 67, 72, 76, 79 U5A, 8 U5B, 8 U6A, 7 U6B, 7 U7, 10, 11, 27, 69, 72, 75, 79 U7A, 10 U7C, 10 U7D, 10 U7E, 10 U9, 7, 10, 27, 67, 68, 73, 76, 80 U9A, 11 U9B, 10 U9C, 10 U9E, 10 U9F, 11 UART, 19 uneven power, 8 user storage, 7 voltage di
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.