Alesis QUADRAVERB II Service Manual
  1. Manuals
  2. Brands
  3. Alesis Manuals
  4. Recording Equipment
  5. QUADRAVERB II
  6. Service manual
Alesis QUADRAVERB II Service Manual

Alesis QUADRAVERB II Service Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
ALESIS
QUADRAVERB II SERVICE MANUAL
V2.00 12/12/95
Alesis QuadraVerb II 2.00
I
07/19/06

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the QUADRAVERB II and is the answer not in the manual?

Questions and answers

Related Manuals for Alesis QUADRAVERB II

Summary of Contents for Alesis QUADRAVERB II

  • Page 1 ALESIS QUADRAVERB II SERVICE MANUAL V2.00 12/12/95 Alesis QuadraVerb II 2.00 07/19/06...

  • Page 2: Preface

    This document is intended to assist the service technician in the operation, maintenance and repair of the QuadraVerb II Digital Stereo Effects Processor. Together with the QVII Reference Manual, this document provides a complete description of the functionality and serviceability of the QVII. Any comments or suggestions you may have pertaining to the document are welcome and encouraged.

  • Page 3: Safety Suggestions

    The product is exposed to water or excessive moisture, c. The AC power supply plug or cord is damaged, d. The product shows an inappropriate change in performance or does not operate normally, or e. The enclosure of the product has been damaged. Alesis QuadraVerb II 2.00 07/19/06...

  • Page 4: General Troubleshooting

    (burnt, or loose components are a dead giveaway). 2. Self Test - Alesis products that utilize microprocessor control contain built in test software which exercises many of the units' primary circuit functions. Self test should always be done following any repair to ensure basic functionality.

  • Page 5: Table Of Contents

    7.20 Further Testing................B-1 7.21 Audio ................. B-1 7.22 Digital I/O ................B-1 7.23 MIDI .................. B-1 8.00 Appendix 3 Helpful Hints & Common Solutions ........C-1 9.00 Appendix 4 Schematics ................D-1 9.10 Revision A ..................D-3 Alesis QuadraVerb II 2.00 07/19/06...
  • Page 6 10.00 Appendix 5 Software History ..............E-1 11.00 Appendix 6 MIDI Implementation............F-1 11.10 V1.0X ..................F-1 11.20 V2.0X ..................F-21 12.00 Appendix 7 Service Manual History ............G-1 13.00 Appendix 8 Service Parts List............... H-1 Alesis QuadraVerb II 2.00 07/19/06...

  • Page 7: General Description

    1.00 General Description The QuadraVerb II, and other digital reverbs, achieve their results by slicing analog signals into segments, and then converting them to a numeric value, corresponding to the amplitude of the signal at that particular instant. These values are then mathematically manipulated, and stored at various locations in a memory "loop"...

  • Page 8: Analog Signal Paths

    (R68, R67, R99, R104, R105, R98, R15, R77, R69, and R74). The output jack is terminated with R106 and R107, along with C80 and C15 to ensure amplifier stability. The right output channel is identical and is built around op amps U26D, U18A, and U18B. Alesis QuadraVerb II 2.00 07/19/06...

  • Page 9: A-D/D-A Converters

    R78, and is filtered by C53, and C55. It's bit clock, which is 3.072MHz, is buffered by nand gate U23B. The D to A outputs are balanced and routed through differential amplifiers to the unit's output jacks, via the analog output section (see sec. 3.20). Alesis QuadraVerb II 2.00 07/19/06...

  • Page 10: Digital Signal Paths

    Note that reset is active on power down as well as power up. This is necessary to prevent noise on the microprocessor data and address busses from corrupting SRAM data. Alesis QuadraVerb II 2.00 07/19/06...

  • Page 11: Sram

    A/D and D/A converters, DRAM interface control, and optical input/output communication protocol. The chip was designed specifically by Alesis engineers with the intent of providing the new standard in state of the art multi effects processors.

  • Page 12: Clock Sources And Vcos

    R22 provides a current source for the opto, while R21 acts as a pullup. J2 is the MIDI output jack and is driven through R17, by inverters U4D and U4E, which are buffering the 8031's TXD port. R14 is a pullup resistor. Alesis QuadraVerb II 2.00 07/19/06...

  • Page 13: Encoder Interface

    J4 is the bypass foot switch jack and is coupled to the 8031 through R5, and utilizes R4 as a pullup resistor. Both foot switches default to the normally open momentary type unless a normally closed type is installed before power up, in which case the processor will Alesis QuadraVerb II 2.00 07/19/06...

  • Page 14: Appendix 1 Updates And Corrections

    6.00 Appendix 1 Updates and Corrections 6.10 Important Production Changes 6.11 VCO Mod The following changes (Diagrams 1 and 2) improve VCO (Voltage Controlled Oscillator) performance, and prevents the unit from possibly detuning by itself. Diagram 1 Alesis QuadraVerb II 2.00 07/19/06...

  • Page 15: Sram Current Increase

    Revision A and C Main PC Boards in order to maintain data integrity. The first page applies to both Revision A and C PCBs, while sheet 2 applies to Revision A only, and sheet 3 applies to Revision C only. Alesis QuadraVerb II 2.00 07/19/06...
  • Page 16 Alesis QuadraVerb II 2.00 07/19/06...
  • Page 17 Alesis QuadraVerb II 2.00 07/19/06...
  • Page 18 Alesis QuadraVerb II 2.00 07/19/06...

  • Page 19: Revision A & C Input Changes

    Add 2 3K resistors (AlPartNo.s 0-10-0302 {Surface Mount} or 0-00-0302 {Through Hole}) across capacitors C33 and C75 (See diagram 6 for locations). This change prevents the audio outputs from inverting when the unit is clipping, reducing noise under these conditions. Diagram 6 Alesis QuadraVerb II 2.00 07/19/06...

  • Page 20: Revision A. Sampling Modification

    Revision A PCBs. The details of the modification are shown in Diagram 7. If this modification is not performed when upgrading the software will display "UNIT NEEDS SAMPLING UPGRADE" any time the sampling configuration is called up. Diagram 7 Alesis QuadraVerb II 2.00 07/19/06...

  • Page 21: Revision A & C Vco Changes

    2.01 or higher, and thus should only performed on older units if there is a specific complaint of Dig I/O noise. Diagram 8 Alesis QuadraVerb II 2.00 07/19/06...

  • Page 22: Appendix 2 Test Procedures

    MIDI is easily tested with a system exclusive storage unit (such as DataDisk or MIDI equipped computer) by sending all programs to, and receiving them back from the storage unit. Keyboard controllers, and patch changers also be used to test MIDI in. Alesis QuadraVerb II 2.00 07/19/06...

  • Page 23: Appendix 3 Helpful Hints & Common Solutions

    8.00 Appendix 3 Helpful Hints & Common Solutions Troubleshooting a complex device, such as the QuadraVerb II, can range from the simplicity of looking, seeing, and reseating a loose cable, to examining complex timing relationships of data and control, and replacing the "slightly" bad latch. The following table is presented in an effort to relieve the beleaguered technician from having to "discover"...

  • Page 24: Appendix 5 Software History

    11. Modulation of Leslie speed is smoother. 12. Error message displayed when “MEMORY FULL” is caused by a delay note value change. 13. Program change to a program containing a Leslie will not cause occasional audio glitches. 07/06/95 2.00 Checksum: 9BFDH. Alesis QuadraVerb II 2.00 07/19/06...
  • Page 25 6. The program bank selection by controller 0 is fixed. 7. The spelling of “ATTACK TIME” in the footswitch mod. pages is corrected. 8. Transmitting MIDI to the Q2 during power-up will no longer cause problems. Alesis QuadraVerb II 2.00 07/19/06...

  • Page 26: Appendix 6 Midi Implementation

    <data> is in a packed format in order to optimize data transfer. Eight MIDI bytes are used to transmit each block of 7 QuadraVerb II data 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: Alesis QuadraVerb II 2.00...
  • Page 27 101 is a dump all request in which all user programs are dumped as individual program dumps (02) followed by a global dump (07) When received, the QuadraVerb II will respond to this message with a MIDI user program dump (02) of the program number selected.

  • Page 28: Parameter Format

    12:7-12:0 13. Reserved for future use (set to 0) 13:7-13:0 QUADRAVERB II PROGRAM DATA FORMAT Programs contain 256 bytes of packed parameter data. The first 92 bytes are common parameters for all programs. The next 164 bytes depend on the number of bytes required for parameters of the effect blocks and the number of routes enabled.

  • Page 29: Block Types

    ** Target block # definition: 1 = block 1, ..., 8 = block 8, 9 = left out, 10 = right out, 11 = mix parameters. *** Definitions of the modulation targets are in the section: Modulation target definitions Alesis QuadraVerb II 2.00 07/19/06...
  • Page 30 * Block parameters are not stored for blocks that are off. Parameters are stored in order of appearance on the Quadraverb II display - by block #, parameter page #, and from left to right within the page; the 1st stored parameter appears on the display at the left most block that is not off, on it’s 1st parameter page, at the left.
  • Page 31 1 Band low parametric 1 Band high parametric Highpass shelf eq 2 Band sweep shelf eq 3 Band parametric eq 4 Band parametric eq 5 Band graphic eq Resonator Mono tremolo Stereo tremolo Stereo simulator Alesis QuadraVerb II 2.00 07/19/06...
  • Page 32 Multi tap delay Tap tempo mono delay Tap tempo ping pong dela Type = RVB Parameter: Block subtype Mono room Room Hall Plate Chamber 1 Room Hall Plate Chamber 2 Large plate Large room Spring Nonlinear Reverse Alesis QuadraVerb II 2.00 07/19/06...
  • Page 33 Parameter #1 Parameter #2 Parameter #33 If TT = 01 NNNNNN Modulation target route In left In right Block 1 inmix Block 1 mix Block 1 left Block 1 right Block 2 inmix Block 8 right Alesis QuadraVerb II 2.00 07/19/06...

  • Page 34: Block Parameter Definitions

    2 BAND SWEEP SHELF EQ: type = 1, subtype = 7 lowpass 10,000 gain -140 +140 highpass 20,000 gain -140 +140 3 BAND PARAMETRIC EQ: type = 1, subtype = 8 lowpass 10,000 gain -140 +140 mid band 2,000 Alesis QuadraVerb II 2.00 07/19/06...
  • Page 35 RESONATOR: type = 1, subtype = 11 tuning decay MONO TREMOLO: type = 1, subtype = 12 speed depth shape STEREO TREMOLO: type = 1, subtype = 13 speed depth shape STEREO SIMULATOR: type = 1, subtype = 14 degrees Alesis QuadraVerb II 2.00 E-10 07/19/06...
  • Page 36 STEREO LEZLIE: type = 2, subtype = 7 lezlie motor speed high rotor level stereo separation PITCH SHIFTER: type = 2, subtype = 8 pitch shift fine coarse PITCH DETUNE: type = 2, subtype = 9 detune amount Alesis QuadraVerb II 2.00 E-11 07/19/06...
  • Page 37 L<- ->R master feedback TAP TEMPO MONO DELAY: type = 3, subtype = 4 delay 50,000 note value feedback TAP TEMPO PING PONG DELAY: type = 3, subtype = 5 delay 25,000 note value feedback Alesis QuadraVerb II 2.00 E-12 07/19/06...
  • Page 38 20,000 predelay mix direct<- ->dly gate trig gated level gate hold release ROOM 1: type = 4, subtype = 3 decay damping hi reverb density diffusion input high freq roll off 20,000 Alesis QuadraVerb II 2.00 E-13 07/19/06...
  • Page 39 ROOM 2: type = 4, subtype = 6 decay damping hi reverb density diffusion input high freq roll off 20,000 predelay mix direct<- ->dly reflection level spread reverberation swirl gate trig gated level gate hold release Alesis QuadraVerb II 2.00 E-14 07/19/06...
  • Page 40 CHAMBER 2: type = 4, subtype = 9 decay damping hi reverb density diffusion input high freq roll off 20,000 predelay mix direct<- ->dly reflection level spread reverberation attack gate trig gated level gate hold release Alesis QuadraVerb II 2.00 E-15 07/19/06...
  • Page 41 SPRING: type = 4, subtype = 12 decay damping hi reverb density diffusion input high freq roll off 20,000 predelay mix direct<- ->dly gate trig gate level gate hold release Alesis QuadraVerb II 2.00 E-16 07/19/06...
  • Page 42 -36.0 dB -34.0 dB -32.0 dB -31.0 dB -30.0 dB -29.0 dB -28.0 dB -27.0 dB -26.0 dB -25.0 dB -24.0 dB -23.0 dB -22.0 dB -21.0 dB -20.0 dB -19.5 dB -19.0 dB Alesis QuadraVerb II 2.00 E-17 07/19/06...
  • Page 43 -8.0 dB -7.5 dB -7.0 dB -6.5 dB -6.0 dB -5.5 dB -5.0 dB -4.5 dB -4.0 dB -3.5 dB -3.0 dB -2.5 dB -2.0 dB -1.5 dB -1.0 dB -0.5 dB -0.0 dB Alesis QuadraVerb II 2.00 E-18 07/19/06...

  • Page 44: V2.0X

    7 QuadraVerb 2 data 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: Alesis QuadraVerb II 2.00 E-19 07/19/06...
  • Page 45 14 Quadraverb 2 bytes (see below) and transferred as 16 MIDI bytes. The last byte packs the most significant bit of the footswitch head parameter into bit address 13:0 and the msb of the footswitch tail into bit address 13:1. The following table outlines this: Alesis QuadraVerb II 2.00 E-20 07/19/06...
  • Page 46 0C - MIDI User Bank 1 Program Dump F0 00 00 0E 0E 0C<prog.#> <data> F7 <program#>= 0..99 selects individual User Bank 1 programs, 100 selects edit <data> is the same format as the <data> of the User Bank 0 Dump opcode (02) Alesis QuadraVerb II 2.00 E-21 07/19/06...
  • Page 47 0: 0 A6 A5 A4 A3 A2 A1 A0 1: 0 0 A8 A7 2: 0 B6 B5 B4 B3 B2 B1 B0 3: 0 0 B8 B7 12 - MIDI Program Table DumpRequest F0 00 00 0E 0F 12 F7 Alesis QuadraVerb II 2.00 E-22 07/19/06...
  • Page 48 0FFH, 0FFH. Only numbers with negative offsets are in 2’s complement form. Parameter name lo lim hi lim bits byte:msb-byte:lsb PROGRAM NAME: Program name ASCII digit 0 0:7-0:0 13. Program name ASCII digit 13 13:7-13:0 Alesis QuadraVerb II 2.00 E-23 07/19/06...
  • Page 49 77. Generator 1 release / decay time or period 0 250 *** 8 77:7-77:0 78. Generator 1 input gain 78:7-78:0 79. Generator 1 envelope hold time 0 250 *** 8 79:7-79:0 80. Generator 1 footswitch source 80:7-80:0 Alesis QuadraVerb II 2.00 E-24 07/19/06...
  • Page 50 255e. Block Bypass for block #5 (1= Bypassed) 255:4-255:4 255f. Block Bypass for block #6 (1= Bypassed) 255:5-255:5 255g.Block Bypass for block #7 (1= Bypassed) 255:6-255:6 255h.Block Bypass for block #8 (1= Bypassed) 255:7-255:7 TYPE DATA FORMAT Alesis QuadraVerb II 2.00 E-25 07/19/06...
  • Page 51 Block copy / paste 4:7-4:0 * The high limit depends on the block type, see the table Block subtype definitions. BLOCK TYPE DEFINITIONS This table defines the block types for a given parameter: Parameter: Block type: Alesis QuadraVerb II 2.00 E-26 07/19/06...
  • Page 52 Phase Inverter Type = PCH Parameter: Block subtype Mono chorus Stereo chorus Quad chorus Mono flanging Stereo flanging Phasor Mono lezlie Stereo lezlie Pitch shifter Pitch detune Ring modulator Mono triggered flange Stereo triggered flange Alesis QuadraVerb II 2.00 E-27 07/19/06...
  • Page 53 Plate Chamber 2 Large plate Large room Spring Nonlinear Reverse MODULATION SOURCE DEFINITIONS Parameter: Block subtype Pitch bend After touch Note number Note velocity Controller 000 Controller 123 Local generator 1 Local generator 2 Alesis QuadraVerb II 2.00 E-28 07/19/06...
  • Page 54 Block 8 inmix level Master fx level BLOCK PARAMETER DEFINITIONS These parameters are packed as 8 or 16 bit words MSB first in programs, but are always considered 16 bit words LSB first in parameter edits. Alesis QuadraVerb II 2.00 E-29 07/19/06...
  • Page 55 4 BAND PARAMETRIC EQ: type = 1, subtype = 9 lowpass 10,000 gain -140 +140 low mid 2,000 -140 +140 high mid 1500 10,000 -140 +140 highpass 20,000 gain -140 +140 5 BAND GRAPHIC EQ: type = 1, subtype = 10 Alesis QuadraVerb II 2.00 E-30 07/19/06...
  • Page 56 TRIGGERED PANNING type = 1, subtype =17 (modulation trig. 1 parm) (modulation trig. 2 parm) speed doppler distance retrigger point sweeping mode trigger source PHASE INVERTER type = 1, subtype =18 output phase Alesis QuadraVerb II 2.00 E-31 07/19/06...
  • Page 57 STEREO LEZLIE: type = 2, subtype = 7 lezlie motor speed high rotor level stereo separation PITCH SHIFTER: type = 2, subtype = 8 pitch shift fine coarse PITCH DETUNE: type = 2, subtype = 9 detune amount Alesis QuadraVerb II 2.00 E-32 07/19/06...
  • Page 58 PING PONG DELAY: type = 3, subtype = 2 delay 25,000 note value feedback MULTI TAP DELAY: type = 3, subtype = 3 delay 50,000 tap level L<- ->R delay 50,000 tap level L<- ->R Alesis QuadraVerb II 2.00 E-33 07/19/06...
  • Page 59 SAMPLING: type = 3, subtype = 6 (modulation play trig. parm 1 (modulation rec trig. parm) play maximum sample length 2500 50,000 start 49,500 50,000 play trigger rec trigger midi note# rec output Alesis QuadraVerb II 2.00 E-34 07/19/06...
  • Page 60 20,000 predelay mix direct<- ->dly gate trig gated level gate hold release PLATE 1: type = 4, subtype = 3 decay damping hi reverb density diffusion input high freq roll off 20,000 Alesis QuadraVerb II 2.00 E-35 07/19/06...
  • Page 61 HALL 2: type = 4, subtype = 6 decay damping hi reverb density diffusion input high freq roll off 20,000 predelay mix direct<- ->dly reflection level spread reverberation swirl gate trig Alesis QuadraVerb II 2.00 E-36 07/19/06...
  • Page 62 LARGE PLATE: type = 4, subtype = 9 decay damping hi reverb density diffusion input high freq roll off 20,000 predelay mix direct<- ->dly reflection level spread reverberation swirl gate trig Alesis QuadraVerb II 2.00 E-37 07/19/06...
  • Page 63 20,000 predelay mix direct<- ->dly REVERSE: type = 4, subtype = 13 reverse time reverb density diffusion input high freq roll off 20,000 predelay mix direct<- ->dly ROUTE POSITION DEFINITIONS Alesis QuadraVerb II 2.00 E-38 07/19/06...
  • Page 64 -22.0 dB -21.0 dB -20.0 dB -19.5 dB -19.0 dB -18.5 dB -18.0 dB -17.5 dB -17.0 dB -16.5 dB -16.0 dB -15.5 dB -15.0 dB -14.5 dB -14.0 dB -13.5 dB -13.0 dB Alesis QuadraVerb II 2.00 E-39 07/19/06...
  • Page 65 -8.0 dB -7.5 dB -7.0 dB -6.5 dB -6.0 dB -5.5 dB -5.0 dB -4.5 dB -4.0 dB -3.5 dB -3.0 dB -2.5 dB -2.0 dB -1.5 dB -1.0 dB -0.5 dB -0.0 dB Alesis QuadraVerb II 2.00 E-40 07/19/06...

  • Page 66: Appendix 7 Service Manual History

    Appendix X (Schematics) moved to end of manual to accommodate use of the larger 11X17 size. Consequently most appendix #s and appendix page #s have changed. Added REV. E to schematics and BOM sections. Updated Table of Contents. Alesis QuadraVerb II 2.00 07/19/06...

  • Page 67: Appendix 8 Service Parts List

    CRYSTAL 12 MHz MAIN 7-01-0011 CRYSTAL 6.144 MHZ (SERIES) MAIN 7-05-0003 BATTERY 3V LITHIUM PANASONIC MAIN 7-20-0006 INDUCTOR 0.68uH 0.5 CTR MAIN 7-20-0018 INDUCTOR 0.15 uH 0.5 CTR MAIN Group Part.# Description Qnty Ref.Designator Comment Alesis QuadraVerb II 2.00 07/19/06...
  • Page 68 IC 80C31 MPU PLCC SMD MAIN 2-71-0084 IC TL084 QUAD OPAMP SMD MAIN U18, U22, U26 2-75-4319 IC AK4318A DUAL 18-BIT DAC MAIN Group Part.# Description Qnty Ref.Designator Comment 2-75-7360 IC SAA7360 ADC PQFP-44 SMD MAIN Alesis QuadraVerb II 2.00 07/19/06...
  • Page 69 RES 15K OHM 1/8W 1% 1206 MAIN 0-11-0203 RES 20K OHM 1/8W 1% 1206 MAIN R55, R59, R66, R70 4-12-0244 SOCKET 44 PIN PLCC SMD MAIN 4-12-0284 SOCKET 84 PIN PLCC SMD MAIN 6-02-0011 SWITCH TACT BUTTON Alesis QuadraVerb II 2.00 07/19/06...
  • Page 70 2-24-0138 IC 6N138 OPTO ISO HEWLETT MAIN 2-27-0022 ASIC DIG FX PROCESSOR 84-PIN DSP1 MAIN 2-31-0059 IC SOFTWARE EPROM Q2 (Ver. 2.01) 4-00-0001 JACK 5-PIN DIN (MIDI) MAIN J9, J10 Group AlPartNo Description Qnty Ref.Designator Comment Alesis QuadraVerb II 2.00 07/19/06...
  • Page 71 1-50-0270 CAP 27 PF NPO 1206 MAIN C51, 52 Group AlPartNo Description Qnty Ref.Designator Comment 1-50-0271 CAP 270 PF NPO 1206 MAIN C22, C37 1-50-0330 CAP 33 PF NPO 1206 MAIN C23, 29, 49, 50 Alesis QuadraVerb II 2.00 07/19/06...
  • Page 72 0-15-1913 RES 91K OHM 1/10W 5% 0805 Group AlPartNo Description Qnty Ref.Designator Comment 4-12-0244 SOCKET 44 PIN PLCC SMD MAIN 4-12-0284 SOCKET 84 PIN PLCC SMD MAIN 6-02-0002 SWITCH DPDT MAIN 6-02-0011 SWITCH TACT BUTTON Alesis QuadraVerb II 2.00 07/19/06...
  • Page 73 Alesis QuadraVerb II 2.00 07/19/06...
  • Page 74 NOTES Alesis QuadraVerb II 2.00 07/19/06...
  • Page 75 13.00 Appendix 6 Schematics Alesis QuadraVerb II 2.00 07/19/06...
  • Page 76 Alesis QuadraVerb II 2.00 07/19/06...
  • Page 77 8.10 Revision A Alesis QuadraVerb II 2.00 07/19/06...
  • Page 78 Alesis QuadraVerb II 2.00 07/19/06...
  • Page 79 8.20 Front Panel Control I/O. Alesis QuadraVerb II 2.00 07/19/06...
  • Page 80 8.30 Revision A Component I.D. Alesis QuadraVerb II 2.00 07/19/06...
  • Page 81 8.40 Revision C Component I.D. Alesis QuadraVerb II 2.00 07/19/06...
  • Page 82 Alesis QuadraVerb II 2.00 07/19/06...

Table of Contents