Alesis QS6 Service Manual Download

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Alesis QS Series Keyboards Service Manual V1.00

11/19/06

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).

✰

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.

✰

Environmental Testing - Applying heat and cold (heat gun/freeze spray) will often reveal

thermally intermittent components (Clock crystals, I.C.s, and capacitors are particularly
prone to this type of failure).

✰

Burn in Testing - Leaving a unit running overnight often reveals intermittent failures such as

capacitors that begin to leak excess current after a significant amount of time.

✰

Cable Checks - Wiggling cables can reveal intermittent failures such as loose cables or

poorly soldered headers. Remember to check power supply cables as well.

✰

Flexing the PC Board - Poor solder joints and broken traces can often be found by pressing

the PC Board in various places.

✰

Tapping Components - Sometimes tapping on a component (particularly crystals) will cause

it to fail.

✰

Power Down/up - Turning the unit off and back on rapidly several times may reveal odd

reset and/or power supply failures.

✰

Reset Threshold - A Variac (variable transformer) can be used to check reset threshold

levels. This can be particularly useful in helping customers with low line problems.

✰

Compressors - Using a compressor/limiter is often helpful when attempting to solve low

level noise problems, as well as assisting with DAC adjustments.

✰

Sweep Tests - Sweep generators are very useful in checking the frequency response

envelopes of anti-aliasing filters.

✰

Piggybacking - Piggybacking I.C.s is particularly useful when troubleshooting large sections

of logic. This is especially true when working with older units.

Summary of Contents for QS6

Page 1: ......

Page 2: ...ne by you or with reference to the Manual shall be solely your responsibility and Alesis shall have no liability for any such repairs or service work All such service or repairs are performed at the sole risk of the person performing the service or repairs You agree that all such work will be performed in a competent professional and safe manner at all times and to indemnify and fully hold Alesis ...

Page 3: ...ture which accompanies the product 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 WITH ANY ALESIS DISTRIBUTOR OR AUTHORIZED REPAIR SERVICE CENTER IN THE PROVISION OF REPAIR SERVICES OR TO BE OR MAKE REPAIRS AS AN AUTHORIZED SERVICE CENTER ALL REPAIRS DONE BY ANY ENTITY ...

Page 4: ...such as stoves heat registers radiators or other heat producing equipment 7 Ventilation When installing the product make sure that the product has adequate ventilation Improperly ventilating the product may cause overheating which may damage the product 8 Mounting The product should only be used with a rack which the manufacturer recommends The combination of the product and rack should be moved c...

Page 5: ...ailures such as capacitors that begin to leak excess current after a significant amount of time Cable Checks Wiggling cables can reveal intermittent failures such as loose cables or poorly soldered headers Remember to check power supply cables as well Flexing the PC Board Poor solder joints and broken traces can often be found by pressing the PC Board in various places Tapping Components Sometimes...

Page 6: ...e Alesis staff Let s face it without their professionalism and skill there wouldn t be any Alesis products for me to write about In addition to the support of my family and thanking the usual crowd of slackers I call my friends I d also like to thank Speedvision network for almost satisfying my insatiable jones for motorsports Congratulations to Damon Hill for winning the Formula 1 Championship I ...

Page 7: ...Power Up Mute 8 2 30 Digital Signal Paths 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 Constr...

Page 8: ...s 32 6 10 QS6 32 6 11 QS6 Main Revision B 32 6 12 QS6 Main Revision C 33 6 13 QS6 Main Revision D 33 6 14 QS6 Main Revision E 33 6 15 QS6 Main Revision F 34 6 20 QS7 8 35 6 21 QS7 8 Main Revision B 35 6 22 QS7 8 Main Revision C 36 6 23 QS7 8 Main Revision D 36 6 24 QS7 8 Main Revision E 37 6 25 QS7 8 Main Revision F 37 6 25 Changes To QS7 QS8 VCO Circuit All Main PCB Revisions 38 6 30 QSR 38 7 00 ...

Page 9: ...Pinout 28 Figure 17 Keyscan ASIC Pinout 29 Figure 18 H8 Processor Pinout 29 Figure 19 FX SRAM Pinout 30 Figure 20 EPROM Pinout 30 Figure 21 Sound ROM Pinout 30 Figure 22 GAL Pinout 31 Figure 23 DAC Pinout 31 List Of Tables Table 1 Pin to Pin Connections for 9 Pin PC Serial to QS 17 Table 2 Pin to Pin Connections for 25 Pin PC Serial to QS 18 Table 3 Pin to Pin Connections for MAC Serial to QS 18 T...

Page 10: ...ions will be used throughout this manual QS6 Reference Designators are BOLD e g R6 C9 QS7 Reference Designators are Italicized e g R6 C9 QS8 Reference Designators are Underlined e g R6 C9 QSR Reference Designators are Plain e g R6 C9 Combinations are allowed i e Italicized and underlined indicate both QS7 and QS8 references e g R6 C9 1 10 QS6 With the release of the original S5 later updated to S5...

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

Page 12: ...us units would suffice for most purposes many high end players still preferred the 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 Incorporating the same basic sound engine as it s predecessors the QS8 is sure to...

Page 13: ...Alesis QS Series Keyboards Service Manual V1 00 4 11 19 06 Figure 2 QS7 QS8 Simplified Block Diagram ...

Page 14: ...thout 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 This has resulted in several main PCB revisions Each one incorporates previous changes as well as any new improvements made These changes are outlined in Appendix A This manual refe...

Page 15: ...Alesis QS Series Keyboards Service Manual V1 00 11 19 06 6 Figure 3 QSR Simplified Block Diagram ...

Page 16: ...e transformer PCB is routed to the main PCB via J2 2 12B Main PCB Transformer output is bridge rectified D1 D2 D4 and D5 input filtered C8 C96 and C15 regulated U6 U4 and finally output filtered C38 C34 C18 and C24 into the 5V and 5V supplies needed by the unit In addition many 0 1µF capacitors are located throughout the system to act as supply filters Note that the 5V rail requires a lot more fil...

Page 17: ...ecessary for the digital hardware to physically reset a further time delay is required before the output is allowed to turn on This is accomplished with an RC circuit comprised of R49 and C30 R20 and C14 R21 and C13 D15 D3 D1 provides a quick discharge path for the capacitor so that the circuit functions correctly even if power is cycled off and on rapidly Note that in the QS6 it was found that th...

Page 18: ...rial Data line From PC MAC input circuit See Section 2 50 PITCH Pitch Wheel data input See Section 2 31C DATA Data Slider data input See Section 2 31C MOD Mod Wheel data input See Section 2 31C RES CD1 PCMCIA Card 1 Present Switch input See Section 2 32B CD2 PCMCIA Card 2 Present Switch input See Section 2 32B PC MAC PC MAC Serial Port Switch input See Section 2 50 KEYINT Keyscan ASIC interrupt in...

Page 19: ...hinking that hardware register locations latches are actually memory locations The process begins when the H8 sets up the address buss The GAL U12 U13 U9 checks this address to see if it is in the range of hardware registers If the H8 address is within the confines of normal memory the RAM or ROM signal is asserted and memory is accessed normally However if the address is in the hardware range the...

Page 20: ...tal VCO U11 U7 to provide extremely stable clocks to the sound generation system The SG ASIC can send sound information to the FX ASIC by two possible ways The first is the 8 bit data buss The second is via optical information from EOPTOUT pin 3 to the FX ASIC Currently the optical buss is used for all communication 2 32A Sound Generation Sound is generated with the use of Sample ROM playback The ...

Page 21: ...lly a rack mount effects unit in a chip The only other essential major parts are memory for storing samples currently being manipulated instructions on what to do with the sound and of course the sound data itself 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: ...s a spring both absorbing the compression of switch 1 as well as pushing the carbon contacts away from the PCB contact points when the key is release The Keyscan ASIC counts up the time it takes between switch 1 closing and switch 2 closing Since distance between the switches is preset in the design time difference is taken as a direct measure of velocity 2 34B QS8 Key Construction All keyboards i...

Page 23: ...terweight 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 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...

Page 24: ...Alesis QS Series Keyboards Service Manual V1 00 11 19 06 15 Figure 5 QS8 Key Construction ...

Page 25: ...utputs only the mains will be discussed here 2 41 S6 D A The S6 Digital to Analog Converter is an AKM4318A U3 A bit clock BICK of 3 072 MHz buffered by an inverter U18B is sent from the FX ASIC U11 This clock signal is sent to pin 13 of the DAC which is used to latch the serial data on SDATA pin 14 into the device The LRCK pin 12 input is the left and right channel clock This 48KHz clock signal is...

Page 26: ...MAC Serial I O As with MIDI this connector is a serial device with the majority of the work being expedited by the software running in the H8 Since there are two basic types of computer in general use a great deal of extra hardware is required As much as possible the Alesis design team engineered the circuitry to reduce the parts count and combine as much of the two different types as possible The...

Page 27: ...ated from the H8 input port by R28 R87 R74 Pullup resistor R30 R41 R50 ensure the correct TTL signal levels pulled up to 5V 2 52 QS Serial Output PC MAC output initiated by the H8 processor is differentiated into the balanced signals required by the MAC via the comparator pair of U2D and U2C U31B and U31A U24A and U24B Note that the PC interface ignores the TXD and RXD lines Pullups R26 and R25 R9...

Page 28: ...r than a physical switch Q7 is used here provide the necessary switching action to correctly bias the handshake signal driver U24D 2 54 H8 UART Clocking There are 2 internal UARTs Universal Asynchronous Receiver Transmitter in the H8 1 for MIDI and 1 for computer serial I O It should be noted here that the MIDI UARTs all operate at the same fixed rate so further discussion of UART clocking will be...

Page 29: ... test and proceed to the next See the next section for a full description of each test 3 12 Individual Test Mode When in Individual Self Test Mode the Value and Value are used to select which test is to be run and pressing STORE will select it All tests stop upon completion of the test display shows TEST PASSSED or TEST FAILED Pressing Value or Value will exit the test and return to the Individual...

Page 30: ...f these numbers represents the position of one of the pots Data Pots will normally show a range of 0 1023 Pitch and Mod wheels have a range of 0 600 and the Aftertouch has a range of 0 300 Moving each pot will cause the corresponding number in the display to change 3 13 Differences In QSR Self Tests Because it is a rack mount unit and it s buttons are different from the keyboard versions the self ...

Page 31: ...C Serial connector should be tested similarly as well as all other I O type circuitry such as 48KHz PCMCIA and optical with the use of an ADAT Multitrack 3 21 Testing 48KHz Obtain an ADAT XT or a classic ADAT and a BRC Connect the sync cable from the ADAT to the BRC Connect a BNC cable from the BRC s 48K OUT to the QS s 48K IN Connect a fiber optic cable from the QS s OPTICAL OUT to the ADAT s OPT...

Page 32: ... 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 type of casetop The top and sides are one piece and are removed together Figure 9 shows the only way to correctly remove the top panel It should be noted here that extreme caution i...

Page 33: ...Alesis QS Series Keyboards Service Manual V1 00 24 11 19 06 Figure 10 S6 Case Screw Locations Figure 11 QS7QS8 Case Screw Locations ...

Page 34: ...scribed in Section 4 00 Once all of the cables to the casetop have been unplugged it can be set aside until reassembly and testing Next all aftertouch and keyswitch cables from the keyboard should be unplugged from the main PCB Now the case bottom can be turned upside down and the keyboard removal screws unscrewed Once all of the screws are out the case bottom can be lifted away from the old keybo...

Page 35: ...ch 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 thus ruining the entire keyboard Once the rear end on the key is loose lift it slightly then slide it towards the front on the keyboard range of motion stops are built into the key and encirc...

Page 36: ...self test Faulty SG ASIC Two adjacent notes e g C1 and C 1 play simultaneously when one of the notes are played A short exists between two pins on J23 J26 J12 or J13 Half of keyboard not working 1 Ribbon cable J23 J26 J12 or J13 is disconnected at the main PCB LCD reads ADDRESS ERROR SRAM or USER memory is corrupted Reload via DATA DISK or SOUND CARD Check Battery backup circuit Resetting Intermit...

Page 37: ...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 Figure 16 FX ASIC Pinout ...

Page 38: ...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 H8 Processor Pinout ...

Page 39: ...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 SOUND ROM Figure 21 Sound ROM Pinout ...

Page 40: ...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 ...

Page 41: ...ved R F I characteristics to simplified assembly 6 11 QS6 Main Revision B Table 4 QS6 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 BLACK silk screen away from edge Bump up tra...

Page 42: ...by adding A to end of part number Suppress U6 paste by renaming it V6 and suppressing in CAM Add hole in bottom right corner to accommodate screw for mounting keyboard Short thru R49 and U25D connect input to GND to EXT_IN 6 13 QS6 Main Revision D Table 6 QS6 Main PCB Revision D Changes PART NUMBER 9 40 1241 CHANGES FROM REV C TO REV D DATE 6 13 96 CHANGE Change all text from Rev C to D Add 2200uF...

Page 43: ...e waved without harm or corrosion Rev E and Rev F are electrically the same CHANGE Change all text from Rev E to F Move via from beneath the BNC jack Straighten trace into headphone jack Straighten trace above M3 Remove SMK from heatsink Lower MIDI THRU text Add 4 border with breakaway tabs on jack side of PCB Add 15 border with breakaway tabs on keyboard side of PCB Add fiducials on breakaway bor...

Page 44: ... silk screen away from edge Bump up trace below PCMCIA Move 88 UPPER and 76 UPPER silk screen away from edge Move D10 and D11 silk screen away from edge 45 degree angle between J7 and C38 No solder paste for Heat Sink Use V6 for CAM toppaste Teardrop J21 traces Adjust C53 Use C4 fiducials Adjust C46 Add thermals to Heat Sink Clean up logic Add 470Ω in series for 3 072Mhz and 12 288Mhz Plate mounti...

Page 45: ...ect LPF caps C28 C31 C35 C36 in the MAIN AUX OUT to chassis GND Drop C74 and R75 redundant to C70 and R73 Edit text for first 4 ROMs by adding A to end of part number Suppress U6 paste by renaming it V6 and suppressing in CAM Add hole in bottom right corner to accommodate screw for mounting keyboard Short thru R49 and U25D connect input to GND to EXT_IN 6 23 QS7 8 Main Revision D Table 11 QS7 8 Ma...

Page 46: ...ders 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 CHANGE Change all text from Rev E to F Move via from beneath the BNC jack Straighten trace into headphone jack Straighten trace above M3 Remove SMK from heatsink Lower MIDI THRU text Add...

Page 47: ...cked that they not only have the smaller supply capacitor but this resistor has not been installed previously If it found it should be removed The drain on the 5V rail is sufficient to lower the charge across raw supply filter capacitor very rapidly but the 5V rail powers very few components and consequently the it s raw supply filter capacitor holds a significant charge Once the 5V supply is full...

Page 48: ...d Audio Test like QS7 8 as the new last test in the Self Tests 9 Added direct access to the Self Tests as done in the QS7 8 In addition to selecting the tests using the VALUE UP and VALUE DOWN buttons the tests can also be directly selected using the program select buttons 0 8 10 Added new checksum for Sound ROM 0 in the SROM test The SROM test will now pass with either the new or old SROM 0 If on...

Page 49: ...nd with the exception of AMD flash cards Note that whether or not an SRAM Card responds to the MIDI Sequence Start Command depends on the Card manufacturer although the majority do not 3 Fixed Bug in which Mix Program assignments were changed if the data was stored to Card B 4 Fixed bug in which pressing EDIT would crash the unit and likely the PC if the Mix Channel Program Bank or the MIX Channel...

Page 50: ...Alesis QS Series Keyboards Service Manual V1 00 41 11 19 06 ...

Page 51: ...bytes If the 7 data bytes are looked at as one 56 bit word the format for transmission is eight 7 bit words beginning with the most significant bit of the first byte as follows SEVEN QS BYTES 0 A7 A6 A5 A4 A3 A2 A1 A0 1 B7 B6 B5 B4 B3 B2 B1 B0 2 C7 C6 C5 C4 C3 C2 C1 C0 3 D7 D6 D5 D4 D3 D2 D1 D0 4 E7 E6 E5 E4 E3 E2 E1 E0 5 F7 F6 F5 F4 F3 F2 F1 F0 6 G7 G6 G5 G4 G3 G2 G1 G0 TRANSMITTED AS 0 0 A6 A5 A...

Page 52: ...equest F0 00 00 0E 0E 03 edit F7 edit 0 program mode edit 1 16 Mix program edits 1 16 When received the QS6 will respond to this message with a MIDI edit program dump 02 of the edit program selected 04 MIDI Old User Mix Dump F0 00 00 0E 0E 04 mix data F7 mix 0 99 selects individual user mixes 100 mix edit buffer data is in the same format as described in 00 but with a different number of bytes due...

Page 53: ...es sent for a single effects dump is 75 which corresponds to 65 bytes of mix data With the header the total number of bytes transmitted with a program dump is 83 Although a Program is stored along with its Effects they are dealt with independently via MIDI 07 MIDI User Effects Dump Request F0 00 00 0E 0E 07 effect F7 effect 0 127 selects individual user effects When received the QS6 will respond t...

Page 54: ... 79 478 MIDI bytes A delay of 4 25 milliseconds will be placed between each dump resulting in a total transfer time of about 27 seconds When receiving a complete dump the QS6 does not require any delay between dumps 0D MIDI Mode Select F0 00 00 0E 0E 0D mode F7 mode 0 Program mode 1 Mix mode When received the QS6 will change to the mode that was selected The settings will be retained from the last...

Page 55: ...fied parameter to the new value and display it If the function and page selected does not exist in the current configuration the command will cause the nearest legal function page and parameter to be selected but no edit will occur If a Mix edit is sent while in program mode it will be ignored If this command is received while in compare it will be ignored If a program edit command is received it ...

Page 56: ...B1 B0 A7 2 0 C4 C3 C2 C1 C0 B7 B6 3 0 D3 D2 D1 D0 C7 C6 C5 4 0 E2 E1 E0 D7 D6 D5 D4 5 0 F1 F0 E7 E6 E5 E4 E3 6 0 G0 F7 F6 F5 F4 F3 F2 7 0 G7 G6 G5 G4 G3 G2 G1 There are 1171 data bytes sent for a single block of a FLASH card sector which corresponds to 1024 bytes of FLASH card data With the header the total number of bytes transmitted with a program dump is 1181 This will take a minimum of 377 92 ...

Page 57: ... checksum the sending device is expected to resend the data at least once before aborting NOTES ON FLASH CARDS Best case programming time for each megabyte in a FLASH card will be 7 minutes 45 seconds assuming a typical FLASH programming time of 65 milliseconds per sector block and a typical erase time of 1 5 seconds per sector This results in a transfer rate of approximately 43 times slower than ...

Page 58: ...02 Universal Device Reply 00 00 0E Alesis Manufacturer ID 0E 00 QS Family ID LSB first 03 00 QS6 Family Member LSB first xx xx xx xx Software revision ASCI ex 30 31 30 30 0100 1 00 F7 End Of Exclusive PARAMETER FORMAT 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 describe...

Page 59: ...edal 2 controller number 0 4 2 0 120 7 12 6 12 0 13 MIDI program select 0 5 0 0 17 5 13 4 13 0 14 Global spare deleted parameter 0 5 2 0 1 1 14 0 15 Global spare deleted parameter 0 6 0 0 1 1 15 0 16 Global spare deleted parameter 0 1 1 0 16 5 16 4 16 0 17 General MIDI 0 0 1 0 1 1 17 0 18 A D controller reset 0 3 1 0 1 1 18 0 19 A D controller mode 0 3 3 0 2 2 19 1 19 0 These parameters are transm...

Page 60: ...tch semitone 3 0 2 12 25 5 15 1 14 5 23 Channel 1 keyboard low note 4 0 0 0 127 7 16 0 15 2 24 Channel 1 keyboard high note 4 0 1 0 127 7 16 7 16 1 25 Channel 1 midi in on off 4 1 0 0 1 1 17 0 26 Channel 1 midi out on off 4 1 2 0 1 1 17 1 27 Channel 1 keyboard on off 4 1 3 0 1 1 17 2 28 Channel 1 wheels on off 4 2 0 0 1 1 17 3 29 Channel 1 Aftertouch on off 4 2 1 0 1 1 17 4 30 Channel 1 Sustain pe...

Page 61: ...95 7 6 6 6 0 10 Mix name digit 6 0 95 7 7 5 6 7 11 Mix name digit 7 0 95 7 8 4 7 6 12 Mix name digit 8 0 95 7 9 3 8 5 13 Mix name digit 9 0 95 7 10 2 9 4 14 Mix spare 5 10 7 10 3 15 Channel 1 program number 0 127 7 11 6 11 0 16 Channel 1 program type 0 1 1 11 7 17 Channel 1 enable 0 1 1 12 0 18 Channel 1 volume 0 99 7 12 7 12 1 19 Channel 1 pan 0 7 3 13 2 13 0 20 Channel 1 output 0 3 2 13 4 13 3 2...

Page 62: ...e Offset column For direct parameter editing sysex command 10H the function page and data pot number are shown The Mode should be set to 2 Program the Sound parameter set to 0 through 3 for sounds 1 through 4 respectively and the Channel parameter should be set to 0 through 15 for channels 1 through 16 respectively when used in Mix mode Signed parameters should be sent in 2 s complement format Par...

Page 63: ...4 1 3 99 199 8 17 0 16 1 25 Sound amp velocity curve 5 0 0 0 12 4 17 4 17 1 26 Sound amp aftertouch mod 5 0 1 99 199 8 18 4 17 5 27 Sound amp alfo mod 5 0 2 99 199 8 19 4 18 5 28 Sound low note limit 6 0 0 0 127 7 20 3 19 5 29 Sound high note limit 6 0 1 0 127 7 21 2 20 4 30 Sound overlap 6 0 2 0 99 7 22 1 21 3 31 Sound mod 1 source 7 0 0 0 24 5 22 6 22 2 32 Sound mod 1 destination 7 0 1 0 31 5 23...

Page 64: ...d pitch env sustain decay 12 1 1 0 99 7 57 3 56 5 82 Sound pitch env trig type 12 1 3 0 3 2 57 5 57 4 83 Sound pitch env time track 12 2 0 0 1 1 57 6 84 Sound pitch env sustain pedal 12 2 1 0 1 1 57 7 85 Sound pitch env level 12 2 2 0 99 7 58 6 58 0 86 Sound pitch env velocity mod 12 2 3 99 199 8 59 6 58 7 87 Sound filter env attack 13 0 0 0 99 7 60 5 59 7 88 Sound filter env decay 13 0 1 0 99 7 6...

Page 65: ...cking point 5 15 1 2 0 100 7 79 7 79 1 115 Sound tracking point 6 15 1 3 0 100 7 80 6 80 0 116 Sound tracking point 7 15 2 0 0 100 7 81 5 80 7 117 Sound tracking point 8 15 2 1 0 100 7 82 4 81 6 118 Sound tracking point 9 15 2 2 0 100 7 83 3 82 5 119 Sound tracking point 10 15 2 3 0 100 7 84 2 83 4 120 Sound enable 16 0 3 0 1 1 84 3 121 Drum number cannot edit 0 9 4 84 7 84 4 ...

Page 66: ... 3 2 6 0 5 7 12 Drum 1 velocity curve 5 0 0 0 12 4 6 4 6 1 13 Drum 1 note number 6 0 0 0 127 7 7 3 6 5 14 Drum 1 amp envelope decay 8 0 0 0 127 7 8 2 7 4 15 Drum 1 mute group 8 0 1 0 3 2 8 4 8 3 16 Drum 1 note range 6 0 2 0 3 2 8 6 8 5 17 Drum 1 spare 0 0 1 8 7 18 33 Drum 2 parameters see above 16 7 9 0 34 49 Drum 3 parameters see above 24 7 17 0 50 65 Drum 4 parameters see above 32 7 25 0 66 81 D...

Page 67: ... 0 6 0 0 1 Effect spare deleted parameter x 2 1 0 0 95 7 1 5 0 7 2 Effect spare deleted parameter x 2 2 0 0 95 7 2 4 1 6 3 Effect spare deleted parameter x 2 3 0 0 95 7 3 3 2 5 4 Effect spare deleted parameter x 2 4 0 0 95 7 4 2 3 4 5 Effect spare deleted parameter x 2 5 0 0 95 7 5 1 4 3 6 Effect spare deleted parameter x 2 6 0 0 95 7 6 0 5 2 7 Effect spare deleted parameter x 2 7 0 0 95 7 6 7 6 1...

Page 68: ... 1 0 99 7 19 5 18 7 If 17 2 ping pong delay 19 Send 1 delay 10ms 0 4 1 1 0 39 7 15 2 14 4 20 Send 1 delay 1ms 0 4 1 2 0 9 4 15 6 15 3 21 Spare 6 16 4 15 7 22 Spare 4 17 0 16 5 23 Send 1 delay feedback 0 4 1 3 0 99 7 17 7 17 1 24 Spare 7 18 6 18 0 25 Send 1 delay mix 0 5 0 1 0 99 7 19 5 18 7 REVERB SEND 1 26 Reverb type 0 3 1 0 0 6 4 20 1 19 6 27 Send 1 reverb input 1 0 3 0 0 0 1 1 20 2 28 Send 1 r...

Page 69: ...1 0 79 7 36 6 36 0 50 Send 2 delay 1ms 1 4 1 2 0 9 4 37 2 36 7 51 Spare 6 38 0 37 3 52 Spare 4 38 4 38 1 53 Send 2 delay feedback 1 4 1 3 0 99 7 39 3 38 5 54 Spare 7 40 2 39 4 55 Send 2 delay mix 1 5 0 1 0 99 7 41 1 40 3 If 47 1 stereo delay 49 Send 2 left delay 10ms 1 4 1 1 0 39 7 36 6 36 0 50 Send 2 left delay 1ms 1 4 1 2 0 9 4 37 2 36 7 51 Send 2 right delay 10ms 1 4 2 1 0 39 6 38 0 37 3 52 Sen...

Page 70: ...3 delay feedback 2 4 0 3 0 99 7 50 4 49 6 71 Send 3 delay mix 2 5 0 1 0 99 7 51 3 50 5 REVERB SEND 3 72 Send 3 reverb input 1 2 3 0 0 0 1 1 51 4 73 Send 3 reverb input 2 2 3 0 1 0 2 2 51 6 51 5 74 Send 3 reverb balance 2 3 0 2 99 198 8 52 6 51 7 75 Send 3 reverb input level 2 3 0 3 0 99 7 53 5 52 7 DELAY SEND 4 76 Send 4 delay 10ms 3 4 0 1 0 79 7 54 4 53 6 77 Send 4 delay 1ms 3 4 0 2 0 9 4 55 0 54...

Page 71: ...9 7 21 2 20 4 28 Send 1 reverb diffusion 0 3 3 2 0 99 7 22 1 21 3 29 Send 1 reverb density 0 3 3 0 0 99 7 23 0 22 2 30 Send 1 reverb low decay 0 3 2 2 0 99 7 23 7 23 1 31 Send 1 reverb high decay 0 3 2 3 0 99 7 24 6 24 0 32 Send 1 reverb mix 0 5 0 2 0 99 7 25 5 24 7 REVERB SEND 2 33 Send 2 reverb input level 1 3 0 0 0 99 7 26 4 25 6 PITCH SEND 3 34 Send 2 pitch speed 2 0 0 1 0 99 7 27 3 26 5 35 Se...

Page 72: ...11 Spare 3 9 4 9 2 12 Send 1 lezlie speed 0 0 0 1 0 1 7 10 3 9 5 13 Send 1 lezlie motor 0 0 0 0 0 1 1 10 4 14 Send 1 lezlie horn 0 0 0 2 0 6 7 11 3 10 5 15 Spare 7 12 2 11 4 16 Send 1 lezlie mix 0 5 0 0 0 99 7 13 1 12 3 DELAY SEND 1 17 Spare 2 13 3 13 2 18 Send 1 delay input 0 4 0 0 0 99 8 14 3 13 4 19 Send 1 delay 10ms 0 4 0 1 0 79 7 15 2 14 4 20 Send 1 delay 1ms 0 4 0 2 0 9 4 15 6 15 3 21 Spare ...

Page 73: ... 3 0 0 0 1 1 41 2 58 Send 2 reverb input 2 1 3 0 1 0 2 2 41 4 41 3 59 Send 2 reverb balance 1 3 0 2 99 198 8 42 4 41 5 60 Send 2 reverb input level 1 3 0 3 0 99 7 43 3 42 5 61 Spare 43 5 43 4 EQUALIZER 61 Low EQ Frequency x 6 0 0 0 5 3 44 0 43 6 62 Spare 44 5 44 1 62 Low EQ Gain x 6 0 1 0 12 4 45 1 44 6 62 Spare 45 4 45 2 63 Hi EQ Frequency x 6 0 2 0 7 3 45 7 45 5 62 Spare 46 3 46 0 64 Hi EQ Gain ...

Page 74: ... 1 pitch depth 0 0 1 2 0 99 7 11 3 10 5 16 Send 1 pitch feedback 0 0 1 3 0 99 7 12 2 11 4 17 Send 1 pitch mix 0 5 0 2 0 99 7 13 1 12 3 If 11 2 resonator 13 Send 1 resonator tuning 0 0 1 0 0 60 6 10 2 9 5 14 Spare 2 10 4 10 3 15 Send 1 resonator decay 0 0 1 2 0 99 7 11 3 10 5 16 Spare 7 12 2 11 4 17 Send 1 pitch mix 0 5 0 2 0 99 7 13 1 12 3 LEZLIE SEND 1 18 Send 1 lezlie input 1 0 0 2 0 0 1 1 41 3 ...

Page 75: ...0 4 1 2 0 9 4 15 6 15 3 30 Spare 6 16 4 15 7 31 Spare 4 17 0 16 5 32 Send 1 delay feedback 0 4 1 3 0 99 7 17 7 17 1 33 Spare 7 18 6 18 0 34 Send 1 delay mix 0 5 0 3 0 99 7 19 5 18 7 REVERB SEND 1 35 Reverb type 0 3 1 0 0 6 4 20 1 19 6 36 Send 1 reverb input 1 0 3 0 0 0 1 1 20 2 37 Send 1 reverb input 2 0 3 0 1 0 5 3 31 0 30 6 38 Send 1 reverb balance 0 3 0 2 99 198 8 21 4 20 5 39 Send 1 reverb inp...

Page 76: ...x 1 0 2 99 198 8 60 7 60 0 85 MIDImod source 2 x 1 1 0 0 10 4 61 3 61 0 86 MIDImod destination 2 x 1 1 1 0 22 6 62 1 61 4 87 MIDImod level 2 x 1 1 2 99 198 8 63 1 62 2 88 Spare 63 7 63 2 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 8 20 QS7 QS8 QSR Sys Ex The Sys Ex documentation was not available for ...

Page 77: ...N 8 PIN DIN SERIAL CIRCULAR MINI S6 Q7 Q8 QSR 1 MAIN J9 CON 7 10 0026 CON 68 PIN MEM CARD 1 MAIN J17 DIO 2 01 5400 DIODE POWER 1N5400 2 Main D1 2 DIO 2 02 5231 DIODE ZENER 1N5231B 1 Main D6 HDR 4 14 0014 HEADER 14 PIN 0 1 DIL 1 MAIN J14 HDR 4 14 0020 HEADER 20 PIN DIL 0 1 XR CL 1 EDIT SEL FOR KEYPAD PCB HDR 4 14 0020 HEADER 20 PIN DIL 0 1 XR CL 1 MAIN J16 HDR 4 14 2116 HEADER 16 PIN DIL MICROMATCH...

Page 78: ... 03 1128 BRACKET RETAINER PCB S6 6 MTL 9 03 1132 HEATSINK CD S4 S6 S8 Q2 Q7 Q8 QR 1 U9 MTL 9 03 1133 COVER PANEL LEFT S6 1 MTL 9 03 1134 COVER PANEL RIGHT S6 1 MTL 9 06 0008 SPRING TORSION PITCH S6 1 PITCH WHEEL OEM 7 10 0021 PEDAL SUSTAIN S5 W BOX 1 OEM 7 10 0022 KEYBOARD FATAR S6 TP 9S AT 1 PLS 9 15 0076 FOOT ROUND 4 PLS 9 15 1150 BEZEL CARD S6 1 PLS 9 15 1151 BEZEL WHEEL S6 1 LCD PLS 9 15 1152 ...

Page 79: ... SRAM SMD 1 MAIN U15 SMI 2 71 0082 IC TL082 DUAL OPAMP SMD 1 MAIN U6 SMI 2 71 5532 IC NE5532 DUAL OPAMP SMD 1 MAIN U5 SMI 2 72 0339 IC LM339 ANALOG COMP SMD 1 MAIN U2 SMI 2 75 4319 IC AK4318A DUAL 18 BIT DAC 1 MAIN U3 SMI 2 77 0011 IC MASK ROM S6 1 1 MAIN U24 SMI 2 77 0012 IC MASK ROM S6 2 1 MAIN U23 SMI 2 77 0013 IC MASK ROM S6 3 1 MAIN U22 SMI 2 77 0014 IC MASK ROM S6 4 1 MAIN U21 SMM 2 50 4148 ...

Page 80: ...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 1 MAIN SW2 ...

Page 81: ... ELEC 16V 12x24mm 3 MAIN C8 C15 C96 CON 4 04 0003 CON BNC WAKA 1 MAIN J11 CON 4 10 0009 CON 8 PIN DIN SERIAL CIRCULAR MINI S6 Q7 Q8 QSR 1 MAIN J19 CON 4 11 0003 CON DIG OPTICAL TRANSMITTER 1 MAIN J10 CON 7 10 0041 CON 136 PIN STACKED ROM CARD PCMCIA 1 MAIN J22 DIO 2 01 4003 DIODE POWER 1N4003 4 MAIN D1 2 D4 5 DIO 2 02 5231 DIODE ZENER 1N5231B 1 MAIN D9 HDR 4 14 0008 HEADER 8 PIN DIL XR QS 1 MAIN J...

Page 82: ... 1 MAIN M2 ME 7 01 0020 CRYSTAL 7 056 MHZ 1 MAIN M1 ME 7 01 0021 CRYSTAL 14 7456 MHZ 1 MAIN M3 ME 7 05 0003 BATTERY 3V LITHIUM PANASONIC 1 MAIN B1 ME 7 40 2700 TRANSFORMER 115 230V 18VAC 15W S5 1 P S MIS 7 07 0017 INSULATOR SHEET Q7 Q8 1 BETWEEN XFMR AND BOTTOM PNL MIS 7 13 0001 TUBE HEATSHRINK 25D x 1 0L 3 EMI FILTER MIS 7 13 0084 ADHESIVE DIE CUT LCD SIDES S6 1 MIS 7 50 0074 BARCODE S N Q7 1 MIS...

Page 83: ...P 0 1uF NPO 1206 60 MAIN C4 C6 7 C9 C11 C16 C20 C24 27 C34 C39 42 C44 48 C51 63 C67 70 C73 94 SMC 1 50 0220 CAP 22PF NPO 1206 6 MAIN C49 50 C64 C66 C71 72 SMC 1 50 0221 CAP 220PF NPO 1206 8 MAIN C1 C5 C10 C12 C19 C21 C30 C33 SMC 1 50 0562 CAP 5600PF NPO 1206 4 MAIN C28 C31 C35 36 SMI 2 27 0038 ASIC SOUND GEN 84 PIN PLCC REV B S8 S9 QSR 1 MAIN U16 SMI 2 32 0009 IC MPU HITACHI H8 510 SMT 1 MAIN U21 ...

Page 84: ... R94 SMR 0 10 0121 RES 120 OHM 1 8W 5 1206 2 MAIN R2 3 SMR 0 10 0122 RES 1 2K OHM 1 8W 5 1206 1 MAIN R37 SMR 0 10 0123 RES 12K OHM 1 8W 5 1206 8 MAIN R6 7 R9 10 R24 25 R27 28 SMR 0 10 0150 RES 15 OHM 1 8W 5 1206 1 MAIN R58 SMR 0 10 0153 RES 15K OHM 1 8W 5 1206 8 MAIN R5 R8 R11 12 R21 23 R26 SMR 0 10 0202 RES 2K OHM 1 8W 5 1206 4 MAIN R19 R36 R93 R95 SMR 0 10 0203 RES 20K OHM 1 8W 5 1206 3 MAIN R33...

Page 85: ...P J3 HDR 4 15 1008 HEADER 8 PIN SIL 2MM CTR SHROUDED 1 MAIN J1 HDR 4 15 1008 HEADER 8 PIN SIL 2MM CTR SHROUDED 1 HDW 5 00 0016 SCREW 6 32 x 1 4 PPZ 6 6 MAIN PCB HDW 5 00 0016 SCREW 6 32 x 1 4 PPZ 2 2 HEATSINK HDW 5 00 0020 SCREW M3 x 7mm PPZ 9 9 CASE HDW 5 00 1005 SCREW 3 x 6MM KEYPAD 1 OPTIC JACK HDW 5 02 0009 HEATSINK M3x20 D4 1 MAIN HDW 5 02 6320 NUT KEP 6 32 1 1 HEATSINK IC 2 11 7805 REG 7805 ...

Page 86: ... 00 0221 RES 220 OHM 1 8W 5 1 F P R1 RES 0 05 0200 RES 2 OHM 1 2W 5 1 R87 SMC 1 50 0104 CAP 0 1uF NPO 1206 50 MAIN C4 C6 8 C10 C14 C16 C21 C25 26 C30 31 C35 36 C38 C41 47 C48 59 C63 65 C66 C69 76 C78 79 C83 C85 SMC 1 50 0220 CAP 22PF NPO 1206 6 MAIN C39 40 C60 61 C67 68 SMC 1 50 0221 CAP 220PF NPO 1206 8 MAIN C1 C5 C9 C11 C17 18 C24 C28 SMC 1 50 0562 CAP 5600PF NPO 1206 4 MAIN C22 C29 C33 34 SMI 2...

Page 87: ... R51 R56 59 R69 SMR 0 10 0105 RES 1M OHM 1 8W 5 1206 4 MAIN R38 R63 R70 R82 SMR 0 10 0121 RES 120 OHM 1 8W 5 1206 2 MAIN R1 2 SMR 0 10 0123 RES 12K OHM 1 8W 5 1206 8 MAIN R5 7 R11 R23 R26 27 R29 SMR 0 10 0150 RES 15 OHM 1 8W 5 1206 1 MAIN R37 SMR 0 10 0153 RES 15K OHM 1 8W 5 1206 8 MAIN R3 4 R10 R12 R18 R22 R25 R28 SMR 0 10 0202 RES 2K OHM 1 8W 5 1206 5 MAIN R20 R61 R78 R83 84 SMR 0 10 0203 RES 20...

Page 88: ... C37 38 C43 C65 CAP 1 08 2200 CAP 2200uF ELEC 16V 12x24mm 3 MAIN C8 C15 C96 CON 4 04 0003 CON BNC WAKA 1 MAIN J11 CON 4 10 0009 CON 8 PIN DIN SERIAL CIRCULAR MINI S6 Q7 Q8 QSR 1 MAIN J19 CON 4 11 0003 CON DIG OPTICAL TRANSMITTER 1 MAIN J10 CON 7 10 0041 CON 136 PIN STACKED ROM CARD PCMCIA 1 MAIN J22 DIO 2 01 4003 DIODE POWER 1N4003 4 MAIN D1 2 D4 5 DIO 2 02 5231 DIODE ZENER 1N5231B 1 MAIN D9 HDR 4...

Page 89: ...HZ 1 MAIN M1 ME 7 01 0021 CRYSTAL 14 7456 MHZ 1 MAIN M3 ME 7 05 0003 BATTERY 3V LITHIUM PANASONIC 1 MAIN B1 ME 7 40 2700 TRANSFORMER 115 230V 18VAC 15W S5 1 P S MIS 7 07 0017 INSULATOR SHEET Q7 Q8 1 BETWEEN XFMR AND BOTTOM PNL MIS 7 07 0027 SPACER FELT Q8 11 11 BOTTOM OF KEYS 16mm x 20mm x 7mm MIS 7 13 0084 ADHESIVE DIE CUT LCD SIDES S6 1 MTL 9 03 1126 BRACKET PITCH S6 1 MTL 9 03 1127 BRACKET MODU...

Page 90: ...3 1072 FOAM STRIP 5 5x3x1219mm Q8 1 SMC 1 50 0104 CAP 0 1uF NPO 1206 61 MAIN C4 C6 7 C9 C11 C16 C20 C24 27 C34 C39 42 C44 48 C51 63 C67 70 C73 94 SMC 1 50 0220 CAP 22PF NPO 1206 6 MAIN C49 50 C64 C66 C71 72 SMC 1 50 0221 CAP 220PF NPO 1206 8 MAIN C1 C5 C10 C12 C19 C21 C30 C33 SMC 1 50 0562 CAP 5600PF NPO 1206 4 MAIN C28 C31 C35 36 SMI 2 27 0038 ASIC SOUND GEN 84 PIN PLCC REV B S8 S9 QSR 1 MAIN U16...

Page 91: ... R94 SMR 0 10 0121 RES 120 OHM 1 8W 5 1206 2 MAIN R2 3 SMR 0 10 0122 RES 1 2K OHM 1 8W 5 1206 1 MAIN R37 SMR 0 10 0123 RES 12K OHM 1 8W 5 1206 8 MAIN R6 7 R9 10 R24 25 R27 28 SMR 0 10 0150 RES 15 OHM 1 8W 5 1206 1 MAIN R58 SMR 0 10 0153 RES 15K OHM 1 8W 5 1206 8 MAIN R5 R8 R11 12 R21 23 R26 SMR 0 10 0202 RES 2K OHM 1 8W 5 1206 4 MAIN R19 R36 R93 R95 SMR 0 10 0203 RES 20K OHM 1 8W 5 1206 3 MAIN R33...

Page 92: ...grated Circuit Aux Auxiliary Output Crash An unfortunate consequence of the digital age it is a complete system shutdown This can be due either incorrect software values or faulty hardware This can be one of the most difficult types of problems to troubleshoot D A Digital to Analog conversion DAC Digital to Analog Converter DRAM Dynamic Random Access Memory EPROM Erasable Programmable Read Only Me...

Page 93: ...nal QuadraSynth Keyboard S6 Alesis 2 nd generation QS Keyboard Smaller than the S5 it featured better key action and the first direct PC serial connector S7 The latest generation of Alesis Keyboard Synths with an improved PC Serial interface S8 Also known as the S4 this significant upgrade added a more extensive sound library an improved user interface as well as improved and expanded effects S9 A...

Page 94: ...D9 10 71 78 D A 16 17 82 DAC v 7 8 9 12 16 17 31 69 74 76 81 82 DACs 17 Data Buss 9 13 21 data smoothing 11 DataDisk 8 22 DD0 DD7 13 DEMO 23 Differential 7 8 13 16 17 digital supply 7 16 17 Digital to Analog Converter 16 17 discharge 8 DRAM 12 21 69 73 76 80 82 DSP 11 16 17 27 E ECO 4 Transformer 7 Enable 9 12 13 17 18 19 47 50 51 55 56 End 1 3 11 14 26 33 36 41 48 68 69 73 80 envelope 11 12 56 EO...

Page 95: ...2 18 74 81 R73 18 33 36 74 77 81 R74 18 74 77 81 R8 18 74 77 81 R80 18 74 77 81 R81 18 74 77 81 R82 18 77 R83 18 74 77 81 R84 18 R85 18 74 77 81 R86 18 74 81 R87 18 74 76 81 R9 18 33 36 37 69 74 81 R93 18 74 81 R94 18 74 81 R95 18 74 81 R96 18 74 81 R97 18 rack mount 1 5 12 21 23 83 RAM 10 83 RAS 12 Rate 11 13 17 19 21 27 47 53 82 raw supply 9 10 38 RC circuit 8 RD 9 13 33 36 ReaD ii iv 9 10 12 13...

Page 96: ... 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 V velocity 11 13 22 53 54 56 83 voltage divider 10 volume slider is 8 W Water iii iv waveshaping 18 19 weights 14 Wheel 9 10 12 21 53 54 67 68 71 72 73 78 79 80 WR 13 33 36 WRite vi 9 10 12 13 21 ...

Page 97: ...le 14 Schematic Set Schematic Revision of Pages Comp I D S6 Main PCB A A 3 Y S6 Main PCB B B 3 Y QS7 QS8 Main PCB A 3 Y QS7 QS8 Main PCB B 3 Y QS7 QS8 Main PCB C 3 N QS7 QS8 Main PCB D 3 Y QS7 QS8 Main PCB E 3 Y QS7 QS8 Main PCB F 3 Y QSR Main A 3 Y S6 Keypad A 1 Y S6 Keypad B 1 N QS6 7 8 Keypad C 1 N QSR Front Panel X2 1 Y S6 Slider A 1 N S6 Slider B 1 N QS7 QS8 Slider A 1 N QSR LCD Module X2 1 Y...

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