Alesis QS7.1 Manual de servicio

Alesis QS Series Keyboards Service Manual V1.00 11/19/06 1 1.00 General Descriptions The QS series of 64 voice, keyboard and rack mount digital

Alesis QS Series Keyboards Service Manual V1.00 11/19/06 2 Figure 1 - QS6 Simplified Block Diagram

Alesis QS Series Keyboards Service Manual V1.00 11/19/06 3 1.20 QS7 The QS7 further expanded and improved the system used in the QS6. The larger

Alesis QS Series Keyboards Service Manual V1.00 4 11/19/06 Figure 2 - QS7/QS8 Simplified Block Diagram

Alesis QS Series Keyboards Service Manual V1.00 11/19/06 5 1.40 QSR Many current keyboard players already have their favorite controller keyb

Alesis QS Series Keyboards Service Manual V1.00 11/19/06 6 Figure 3 - QSR Simplified Block Diagram

Alesis QS Series Keyboards Service Manual V1.00 11/19/06 7 2.00 Theory Of Operation 2.10 Power Supplies 2.11 QS6/QSR Power Supply The power supply

Alesis QS Series Keyboards Service Manual V1.00 11/19/06 8 2.22 Headphone Outputs The signal from the volume slider is sent through a X10 X3 X3 ga

Alesis QS Series Keyboards Service Manual V1.00 11/19/06 9 shows that knowing how the hardware is supposed to respond to software changes can grea

Alesis QS Series Keyboards Service Manual V1.00 11/19/06 10 It helps to know the initial state of the active devices in the circuit. While the raw

Alesis QS Series Keyboards Service Manual V1.00 ii 11/19/06 Preface This document is intended to assist the service technician in the operation,

Alesis QS Series Keyboards Service Manual V1.00 11/19/06 11 For further information about MIDI, consult MIDI SPEC available from the Internation

Alesis QS Series Keyboards Service Manual V1.00 11/19/06 12 Once pitch scaling is done, the SG ASIC similarly scales the amplitude o

Alesis QS Series Keyboards Service Manual V1.00 11/19/06 13 ➫ DD0-DD7 Data Buss bits 0 to 7. Correspond to the upper 8 data bits of the H8.

Alesis QS Series Keyboards Service Manual V1.00 11/19/06 14 fulcrum offset from center to increase the relative momentum of the weight, it is push

Alesis QS Series Keyboards Service Manual V1.00 11/19/06 15 Figure 5 - QS8 Key Construction

Alesis QS Series Keyboards Service Manual V1.00 11/19/06 16 2.40 D-A The D-A sections of the QS Series vary slightly from unit to unit. These v

Alesis QS Series Keyboards Service Manual V1.00 11/19/06 17 2.42 QS7/QS8/QSR D-A The QS7/8/R Digital-to-Analog Converter is an AKM4319 (U3 U2).

Alesis QS Series Keyboards Service Manual V1.00 11/19/06 18 Table 2 - Pin to Pin Connections for 25 Pin PC Serial to QS Purpose QS Serial Pin PC

Alesis QS Series Keyboards Service Manual V1.00 11/19/06 19 2.53A QS6/7/8 PC Serial In these units the Enable handshake signal is provided

Alesis QS Series Keyboards Service Manual V1.00 20 11/19/06 3.00 Test Procedures If at all possible, user memory should always be saved (PCMCIA Ca

Alesis QS Series Keyboards Service Manual V1.00 iii 11/19/06 Warnings TO REDUCE THE RISK OF ELECTRIC SHOCK OR FIRE, DO NOT EXPOSE THIS PRODUCT TO W

Alesis QS Series Keyboards Service Manual V1.00 21 11/19/06 circuit, failures should be relatively easy to troubleshoot although failures with t

Alesis QS Series Keyboards Service Manual V1.00 22 11/19/06 3.20 Further Testing Naturally it is a good idea to actually play the keyboard. Be su

Alesis QS Series Keyboards Service Manual V1.00 23 11/19/06 Note: If the QS's power is turned off, the 48K IN must be turned on again. The di

Alesis QS Series Keyboards Service Manual V1.00 24 11/19/06 Figure 10 - S6 Case Screw Locations Figure 11 - QS7QS8 Case Screw Locations

Alesis QS Series Keyboards Service Manual V1.00 25 11/19/06 4.20 QSR Disassembly/Reassembly Figure 12 shows the location of the top panel screws.

Alesis QS Series Keyboards Service Manual V1.00 26 11/19/06 4.51 Replacing QS6 And QS7 Keys Figure 13 shows the location of the spring which must

Alesis QS Series Keyboards Service Manual V1.00 27 11/19/06 4.60 General Troubleshooting The following table was generated from previous tr

Alesis QS Series Keyboards Service Manual V1.00 28 11/19/06 5.00 Appendix A Pinout Diagrams 5.10 SG ASIC Figure 15 - SG ASIC Pinout 5.11 FX ASIC

Alesis QS Series Keyboards Service Manual V1.00 29 11/19/06 5.12 KEYSCAN ASIC Figure 17 - Keyscan ASIC Pinout 5.13 MICRO CONTROLLER Figure 18 - H

Alesis QS Series Keyboards Service Manual V1.00 30 11/19/06 5.14 SRAM Figure 19 - FX SRAM Pinout 5.15 EPROM Figure 20 - EPROM Pinout 5.16 SOUN

Alesis QS Series Keyboards Service Manual V1.00 iv 11/19/06 Safety Suggestions Carefully read the applicable items of the operating instructions an

Alesis QS Series Keyboards Service Manual V1.00 31 11/19/06 5.19 GAL Figure 22 - GAL Pinout 5.20 DAC Figure 23 - DAC Pinout

Alesis QS Series Keyboards Service Manual V1.00 32 11/19/06 6.00 Appendix A Updates And Corrections 6.10 QS6 The QS6 has undergone numerous change

Alesis QS Series Keyboards Service Manual V1.00 33 11/19/06 6.12 QS6 Main Revision C Table 5 - QS6 Main PCB Revision C Changes PART NUMBER: 9-40-1

Alesis QS Series Keyboards Service Manual V1.00 34 11/19/06 6.15 QS6 Main Revision F Table 8 - QS6 Main PCB Revision F Changes PART NUMBER: 9-40-12

Alesis QS Series Keyboards Service Manual V1.00 35 11/19/06 6.20 QS7/8 6.21 QS7/8 Main Revision B Table 9 - QS7/8 Main PCB Revision B Changes PART

Alesis QS Series Keyboards Service Manual V1.00 36 11/19/06 6.22 QS7/8 Main Revision C Table 10 - QS7/8 Main PCB Revision C Changes PART NUMBER: 9-

Alesis QS Series Keyboards Service Manual V1.00 37 11/19/06 6.24 QS7/8 Main Revision E Table 12 - QS7/8 Main PCB Revision E Changes PART NUMBER: 9-

Alesis QS Series Keyboards Service Manual V1.00 38 11/19/06 6.25 Changes To QS7/QS8 VCO Circuit (All Main PCB Revisions) It was found that the Dig

Alesis QS Series Keyboards Service Manual V1.00 39 11/19/06 7.00 Appendix B Software Histories 7.10 QS6 V1.00 September 11th, 1995 Checksum:

Alesis QS Series Keyboards Service Manual V1.00 40 11/19/06 7.20 QS7/QS8 1.00 June 28, 1996 _________________ 1. First Production Release. 1.01 J

Alesis QS Series Keyboards Service Manual V1.00 v 11/19/06 General Troubleshooting While this manual assumes that the reader has a funda

Alesis QS Series Keyboards Service Manual V1.00 41 11/19/06

Alesis QS Series Keyboards Service Manual V1.00 42 11/19/06 8.00 Appendix C Sys-Ex Implementations 8.10 S6 Sys-Ex SYSTEM EXCLUSIVE FORMAT 4/15/95

Alesis QS Series Keyboards Service Manual V1.00 43 11/19/06 program dump is 408. The location of each parameter within a program dump is shown in t

Alesis QS Series Keyboards Service Manual V1.00 44 11/19/06 05-MIDI Old Mix Dump Request F0 00 00 0E 0E 05 <mix#> F7 <mix#> = 0..99

Alesis QS Series Keyboards Service Manual V1.00 45 11/19/06 0A-MIDI Global Data Dump F0 00 00 0E 0E 0A 00 <data> F7 <data> is in the

Alesis QS Series Keyboards Service Manual V1.00 46 11/19/06 0F-MIDI New Mix Dump Request F0 00 00 0E 0E 0F <mix#> F7 <mix#> = 0..99

Alesis QS Series Keyboards Service Manual V1.00 47 11/19/06 12- Sector Write Command F0 00 00 0E 0E 12 <sector#> <block#> <data> &

Alesis QS Series Keyboards Service Manual V1.00 48 11/19/06 14-FLASH Command ACK Response F0 00 00 0E 0E 14 F7 This command is ignored if

Alesis QS Series Keyboards Service Manual V1.00 49 11/19/06 DEVICE INQUIRY The QS6 responds to the Universal Device Inquiry message < F0 7E 7F 06

Alesis QS Series Keyboards Service Manual V1.00 50 11/19/06 GLOBAL DATA FORMAT The Global parameters are comprised of 19 bytes of data. Unlike the

Alesis QS Series Keyboards Service Manual V1.00 11/19/06 vi Acknowledgments While I get the credit for the whole thing, as with any serious book,

Alesis QS Series Keyboards Service Manual V1.00 51 11/19/06 # Parameter name Func Page Pot Offset Limit bits bit address 0. Mix effect MID

Alesis QS Series Keyboards Service Manual V1.00 52 11/19/06 OLD MIX DATA FORMAT This format exists for compatibility with QSs having software prior

Alesis QS Series Keyboards Service Manual V1.00 53 11/19/06 PROGRAM DATA FORMAT Programs contain 350 bytes of packed parameter data. The

Alesis QS Series Keyboards Service Manual V1.00 54 11/19/06 Keyboard Sound: # Parameter name Func Page Pot Offset Limit bits bit address 0

Alesis QS Series Keyboards Service Manual V1.00 55 11/19/06 54. Sound mod 6 gate 7 5 3 0 1 1 36:3 55. Sound pitch lfo waveform 9 0 0 0

Alesis QS Series Keyboards Service Manual V1.00 56 11/19/06 112. Sound tracking point 3 15 1 0 0 100 7 78:1-77:3 113. Sound tracking point

Alesis QS Series Keyboards Service Manual V1.00 57 11/19/06 Drum Sound: # Parameter name Func Page Pot Offset Limit bits bit address 0. Ke

Alesis QS Series Keyboards Service Manual V1.00 58 11/19/06 EFFECT DATA FORMAT Effects contain 64 bytes of packed parameter data. The first 11 byt

Alesis QS Series Keyboards Service Manual V1.00 59 11/19/06 DELAY SEND 1: # Parameter name Send Func Page Pot Offset Limit bits bit address

Alesis QS Series Keyboards Service Manual V1.00 60 11/19/06 PITCH SEND 2: # Parameter name Send Func Page Pot Offset Limit bits bit address

Alesis QS Series Keyboards Service Manual V1.00 11/19/06 vii Table Of Contents Preface ...

Alesis QS Series Keyboards Service Manual V1.00 61 11/19/06 61. Send 3 pitch type 2 0 0 0 0 2 2 43:5-43:4 If 61 = 0 or 1 (chorus and flange

Alesis QS Series Keyboards Service Manual V1.00 62 11/19/06 Configuration 1 (4-sends, 2 reverb): # Parameter name Send Func Page Pot Offset Li

Alesis QS Series Keyboards Service Manual V1.00 63 11/19/06 MODULATION: # Parameter name Send Func Page Pot Offset Limit bits bit address

Alesis QS Series Keyboards Service Manual V1.00 64 11/19/06 Configuration 3 (2-sends, with EQ): # Parameter name Send Func Page Pot Offset Lim

Alesis QS Series Keyboards Service Manual V1.00 65 11/19/06 Configuration 4 (Overdrive, Chorus, Delay, Reverb, Lezlie): # Parameter name Send Fun

Alesis QS Series Keyboards Service Manual V1.00 66 11/19/06 DELAY SEND 1: # Parameter name Send Func Page Pot Offset Limit bits bit address

Alesis QS Series Keyboards Service Manual V1.00 67 11/19/06 EQUALIZER: # Parameter name Send Func Page Pot Offset Limit bits bit address 61

Alesis QS Series Keyboards Service Manual V1.00 68 11/19/06 9.00 Appendix D Service Parts Lists 9.10 QS6 Service Parts List Grp AlPartNo Descript

Alesis QS Series Keyboards Service Manual V1.00 69 11/19/06 IC 2-27-0022 ASIC DSP1 DIG-FX 84-PIN 1 MAIN U11 IC 2-31-0048 IC SOFTWARE EPROM

Alesis QS Series Keyboards Service Manual V1.00 70 11/19/06 REP 8-20-0092 KEY WEIGHTED ‘B’ WHITE S6/S9 1 REP 8-20-0093 KEY WEIGHTED ‘F’ WHI

Alesis QS Series Keyboards Service Manual V1.00 11/19/06 viii 3.20 Further Testing ...

Alesis QS Series Keyboards Service Manual V1.00 71 11/19/06 SWT 6-01-0002 SWITCH SLIDE DPDT 1 MAIN SW1 SWT 6-02-0003 SWITCH DPDT SHADOW ITT

Alesis QS Series Keyboards Service Manual V1.00 72 11/19/06 9.20 QS7 Service Parts List Grp AlPartNo Description Qnty PCB Ref.Designator Comm

Alesis QS Series Keyboards Service Manual V1.00 73 11/19/06 HDW 5-00-1632 SCREW 6-32 x 5/16 PPB W/LOCTITE 3 (2) WHEEL BRACKET, (1) WHEEL BEZEL

Alesis QS Series Keyboards Service Manual V1.00 74 11/19/06 PLS 9-15-1152 WHEEL PITCH & MOD S6 1 PITCH WHEEL PLS 9-15-1152 WHEEL PITCH &a

Alesis QS Series Keyboards Service Manual V1.00 75 11/19/06 SMI 2-77-0047 IC MASK ROM 4 Q7/Q8 1 MAIN U22 SMI 2-77-0048 IC MASK ROM 5 Q7/Q8

Alesis QS Series Keyboards Service Manual V1.00 76 11/19/06 9.30 QSR Service Parts List Grp AlPartNo Description Qnty PCB Ref.Designator Comme

Alesis QS Series Keyboards Service Manual V1.00 77 11/19/06 MIS 7-51-1216 COMPACT-DISC SOFTWARE MIDI/PATCH S6/Q7/Q8/QSR 1 MIS 7-53-0018 STI

Alesis QS Series Keyboards Service Manual V1.00 78 11/19/06 SMI 2-77-0046 IC MASK ROM 3 Q7/Q8 1 MAIN U16 SMI 2-77-0047 IC MASK ROM 4 Q7/Q8

Alesis QS Series Keyboards Service Manual V1.00 79 11/19/06 9.40 QS8 Service Parts List Grp AlPartNo Description Qnty PCB Ref.Designator Comme

Alesis QS Series Keyboards Service Manual V1.00 80 11/19/06 HDW 5-04-1007 FASTENER SNAP RIVET 5 (FOR RUBBER FEET) HDW 5-05-1001 CLIP FUSE 2

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

Alesis QS Series Keyboards Service Manual V1.00 81 11/19/06 PLS 9-15-0076 FOOT ROUND 5 PLS 9-15-1151 BEZEL WHEEL S6 1 PLS 9-15-1152 WHE

Alesis QS Series Keyboards Service Manual V1.00 82 11/19/06 SMI 2-77-0047 IC MASK ROM 4 Q7/Q8 1 MAIN U22 SMI 2-77-0048 IC MASK ROM 5 Q7/Q8

Alesis QS Series Keyboards Service Manual V1.00 83 11/19/06 10.00 Appendix E Dictionary Of Selected Terms 48KHz Normally running at 48Khz, howe

Alesis QS Series Keyboards Service Manual V1.00 84 11/19/06 PC Personal Computer generically. IBM style specifically as used here. PCMCIA Pe

Alesis QS Series Keyboards Service Manual V1.00 85 11/19/06 11.00 INDEX + +5V, 7, 9, 10, 13, 16, 17, 18, 38, 67, 72, 75, 79 0 0.1(F capacitors, 7 ¼

Alesis QS Series Keyboards Service Manual V1.00 86 11/19/06 Memory Mapped, 10, 11, 12 Memory mapping, 10 microprocessor, v, 8, 10, 11, 27, 82 MIDI,

Alesis QS Series Keyboards Service Manual V1.00 87 11/19/06 U25C, 19 U26, 19, 73, 76, 80 U26A, 19 U26C, 19 U27, 19, 74, 76, 81 U28, 19, 73, 76, 80 U

H-88 12.00 Schematics Note that some revisions are electrically identical to previous versions. In these cases only the pertinent schematics ar