Table of Contents
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Preface ................................................................................................................ii
READ THIS! .........................................................................................................ii
Warnings .............................................................................................................iii
Safety Suggestions ............................................................................................iv
General Troubleshooting ...................................................................................v
Acknowledgments..............................................................................................vi
Table Of Contents...............................................................................................vii
List Of Figures ....................................................................................................ix
List Of Tables......................................................................................................ix
1.00 General Descriptions..................................................................................1
1.10 QS6............................................................................................................ 1
1.20 QS7............................................................................................................ 3
1.30 QS8............................................................................................................ 3
1.40 QSR ........................................................................................................... 5
2.00 Theory Of Operation...................................................................................7
2.10 Power Supplies .......................................................................................... 7
2.20 Analog Signal Paths................................................................................... 7
2.30 Digital Signal Paths.................................................................................... 8
2.40 D-A............................................................................................................. 16
2.50 PC/MAC Serial I/O ..................................................................................... 17
3.00 Test Procedures..........................................................................................20
3.10 Self Tests................................................................................................... 20
Alesis QS Series Keyboards Service Manual V1.00
Table Of Contents
2.11 QS6/QSR Power Supply ......................................................................... 7
2.12 QS7/QS8 Power Supply .......................................................................... 7
2.12A Transformer PCB ..................................................................................7
2.12B Main PCB..............................................................................................7
2.13 SRAM Battery Backup............................................................................. 7
2.21 Main Outputs ........................................................................................... 7
2.22 Headphone Outputs ................................................................................ 8
2.23 QS7/QS8/QSR Aux Outputs.................................................................... 8
2.24 Power Up Mute........................................................................................ 8
2.31 H8/510 Microprocessor ........................................................................... 8
2.31A RESET..................................................................................................9
2.31B The GAL and Memory Mapped I/O .......................................................10
2.31C Other Processor I/O..............................................................................10
2.31D MIDI......................................................................................................10
2.31E PC Serial Connector .............................................................................11
2.32 The SG ASIC........................................................................................... 11
2.32A Sound Generation .................................................................................11
2.32B ROM Card Connector ...........................................................................12
2.33 The FX ASIC ........................................................................................... 12
2.33A QS7/8/R Digital Optical I/O ...................................................................12
2.34 The KEYSCAN ASIC............................................................................... 12
2.34A Reading Velocity ...................................................................................13
2.34B QS8 Key Construction...........................................................................13
2.41 S6 D-A..................................................................................................... 16
2.42 QS7/QS8/QSR D-A ................................................................................. 17
2.51 QS Serial Input ........................................................................................ 18
2.52 QS Serial Output ..................................................................................... 18
2.53 PC/MAC Switch ....................................................................................... 18
2.53A QS6/7/8 PC Serial.................................................................................19
2.53B QS6/7/8 MAC Serial..............................................................................19
2.53C QSR Variant .........................................................................................19
2.54 H8 UART Clocking .................................................................................. 19
3.11 Automated Test Mode ............................................................................. 20
3.12 Individual Test Mode ............................................................................... 20
3.13 Differences In QSR Self Tests ................................................................ 21
vii
11/19/06
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