Alesis quadraverb Service Manual
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Alesis quadraverb Service Manual

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Alesis QuadraVerb Service Manual
Revision 1.00
6/28/94
Alesis QuadraVerb Service Manual------
i
08/13/04

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  • Page 1 Alesis QuadraVerb Service Manual Revision 1.00 6/28/94 Alesis QuadraVerb Service Manual------ 08/13/04...

  • Page 2: Read This

    As the owner of the copyright to the Manual, Alesis does not give you the right to copy the Manual, and you agree not to copy the Manual without the written authorization of Alesis.

  • Page 3: Warnings

    Battery Manufacturer: Tadiran Type: TL-5101 Rating 3.6V 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.

  • Page 4: 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 Service Manual------ 08/13/04...

  • Page 5: 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 6: Table Of Contents

    7.10 QV I/P Filter Kit Installation ..................8 8.0 Helpful Hints & Common Solutions..................12 9.0 Schematics..........................14 10.0 Software History........................16 11.0 Quadraverb Plus MIDI Implementation/System Exclusive ..........18 12.0 Quadraverb Service Parts List .....................34 Index.............................37 Service Manual History ........................39 Alesis QuadraVerb Service Manual------...

  • Page 7: Quadraverb General Description

    1.0 QuadraVerb General Description The QuadraVerb, 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: Battery Backup

    R14, to the output jacks. Note that some incompatibilities have been encountered when using the QuadraVerb with some particular amplifier effects loops. If the customer is experiencing level drops when using the unit in such a setup, it is possible to adjust the output stage gain to accommodate the amplifier (see section 7.11).

  • Page 9: Anti-Aliasing Filters

    DASP 24 ASIC) will take over. Starting with the MSB, the SAR will set the bit, and compare the output of the DAC, to the level of the input sample capacitor (via comparator U8). The results of the Alesis QuadraVerb Service Manual------ 08/13/04...

  • Page 10: Digital Signal Paths

    4.3), and the 8031's built in I/O ports. 4.2 Reset The 8031 reset circuit is perhaps the single most important circuit in the QuadraVerb. When this circuit is functioning incorrectly, problems ranging from loss of battery backup, to a complete lock-up of the machine, can occur.

  • Page 11: Memory Mapped I/O

    While output from the 8031 can be handled simply using memory mapped I/O, and binary weighted networks, analog input to the 8031 is a bit trickier. The method used in the QuadraVerb, is to examine the time it takes a constantly charging capacitor to reach the level of the input signal. The majority of op amp U22 is used to accomplish this.

  • Page 12: Test Procedures

    (power unit up while holding "BYPASS" and "PROG" buttons down) after changing the EPROM, SRAM, or any part of the battery backup. To perform the QuadraVerb's self diagnostics connect a MIDI cable between MIDI in, and MIDI out. Power up the unit while holding the "BYPASS", and "CONFIG", buttons down.

  • Page 13: Header Capacitor

    It may be necessary to bypass the wet VCA to decrease the noise floor. To do this, remove U6. Add jumpers across C11, C12, from U6 pin 1 to pin 3, and from pin 5 to pin 7 (see diagram 7).* Alesis QuadraVerb Service Manual------ 08/13/04...

  • Page 14: Dac Adjustment Installation

    * - The application of these items are left to the discretion of the technician. 7.10 QV I/P Filter Kit Installation The following update enhances the input filter of the Quadraverb by increasing the number of filter poles from 4 to 6. This gives a corresponding increase in the filter rolloff rate, and eliminates problems encountered when using the QV with high bandwidth samplers such as the Ensoniq ESQ- 1, the Roland D-50, or the EMU Proteus.
  • Page 15 Adjust the input level to the QV to about 1Vp-p, sweeping from 20Hz to 25KHz. Observe the filters output at U3 pin 7. Any large deviations from the plot indicate a problem and should be troubleshot. Diagram 6 Alesis QuadraVerb Service Manual------ 08/13/04...
  • Page 16 Diagram 7 Alesis QuadraVerb Service Manual------ 08/13/04...
  • Page 17 Diagram 8 Diagram 9 Alesis QuadraVerb Service Manual------ 08/13/04...

  • Page 18: Helpful Hints & Common Solutions

    8.0 Helpful Hints & Common Solutions Troubleshooting a complex device, such as the QuadraVerb, 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 chart is presented in an effort to relieve the beleaguered technician from having to "discover"...
  • Page 19 "SYSEX ENABLE" is turned on.) Remember to install ALL of the latest revisions, before returning the unit. This can help prevent many unhappy returns. All Trademarks are property of their respective companies. Alesis QuadraVerb Service Manual------ 08/13/04...

  • Page 20: Schematics

    9.0 Schematics Alesis QuadraVerb Service Manual------ 08/13/04...
  • Page 21 Alesis QuadraVerb Service Manual------ 08/13/04...

  • Page 22: Software History

    250Hz and 16KHz was set to a few dB of cut. 2) The duty cycle of the EQ cursor flashing has been changed to improve its visibility. 8/10/90 2.00 1) Quadraverb Plus first release. Too many features to describe. Alesis QuadraVerb Service Manual------ 08/13/04...
  • Page 23 This is now fixed. 3/10/92 2.03 1) If a MIDI controller was routed to modulate the speed of the chorus, an awful sound would occur when the controller was moved. This is now fixed. Alesis QuadraVerb Service Manual------ 08/13/04...

  • Page 24: Quadraverb Plus Midi Implementation/System Exclusive

    All parameters to be edited must be sent in this format (12 MIDI bytes), regardless of the number of bits required to transmit the value of the parameter. When the QuadraVerb receives this message, it will edit the specified parameter to the new value and display it. If the function and page selected does not exist in the current configuration, the command will be ignored.
  • Page 25 <data> is in a packed format in order to optimize data transfer. Eight MIDI bytes are used to transmit each block of 7 QuadraVerb data bytes. If the 7 data bytes are looked at as one 56-bit word, the format...
  • Page 26 0-8 (DIFFUSION) 0-8 (DIFFUSION) 0-8 (DIFFUSION) 0-8 (DIFFUSION) 0-8 (DIFFUSION) 0-8 (DENSITY) 0-8 (DENSITY) 0-8 (DENSITY) 0-60 (LOW DEC) 0-8 (DENSITY) 0-60 (LOW DEC) 0-60 (LOW DEC) 0-60 (LOW DEC) 0-60 (HIGH DEC) 0-60 (LOW DEC) Alesis QuadraVerb Service Manual------ 08/13/04...
  • Page 27 0-198 (IN MIX) 1-800 (DELAY) 1-400 (L DELAY) 1-400 (DELAY) 0-99 (FEEDB) 0-99 (L FEEDB) 0-99 (FEEDB) 1-400 (R DELAY) 0-99 (R FEEDB) CONFIGURATION 1, 5: page 0 (type) 0 (MONO) 1 (STEREO) 2 (PING-PONG) Alesis QuadraVerb Service Manual------ 08/13/04...
  • Page 28 0-99 (FEEDB) 0-99 (L FEEDB) 0-99 (FEEDB) 1-1493 (TAP DELAY) 1-750 (R DELAY) 0-99 (TAP VOLUME) 0-99 (R FEEDB) 0-198 (TAP PAN) 0-99 (TAP FB) 0-99 (MASTER FB) CONFIGURATION 4: Not used CONFIGURATION 6: page Alesis QuadraVerb Service Manual------ 08/13/04...
  • Page 29 0-1 (TRIGGER) CONFIGURATION 1: page 0-99 (SEPARATION) 0-1 (MOTOR) 0-1 (SPEED) CONFIGURATION 2 & 7: Not used CONFIGURATION 4: page 0 (type) 0 (CHORUS OFF) 1 (CHORUS ON) 0-1 (WAVE) 0-99 (SPEED) 0-99 (DEPTH) CONFIGURATION 5: Alesis QuadraVerb Service Manual------ 08/13/04...
  • Page 30 CONFIGURATION 1: page 0-26 (HIGH ROTOR LEVEL) CONFIGURATION 2: page 0-28 (16Hz) 0-28 (32Hz) 0-28 (62Hz) 0-28 (126Hz) 0-28 (250Hz) 0-28 (500Hz) 0-28 (1KHz) 0-28 (2KHz) 0-28 (4KHz) 0-28 (8KHz) 0-28 (16KHz) CONFIGURATION 3: page Alesis QuadraVerb Service Manual------ 08/13/04...
  • Page 31 MIX (FUNCTION 8) CONFIGURATION 0: page 0 (type) 0 (PRE-EQ) 1 (POST-EQ) 0-99 (DIRECT) 0-99 (MAST FX) 0-99 (MAST FX) 0-99 (EQ) 0-99 (PITCH) 0-99 (PITCH) 0-99 (DELAY) 0-99 (DELAY) 0-99 (REVERB) 0-99 (REVERB) CONFIGURATION 1: page Alesis QuadraVerb Service Manual------ 08/13/04...
  • Page 32 CONFIGURATION 5: page 0-99 (MAST FX) 0-99 (DIRECT) 0-99 (RING MOD) 0-99 (DELAY) 0-99 (REVERB) CONFIGURATION 6: page 0-99 (MAST FX) 0-99 (DIRECT) 0-99 (RESONATOR) 0-99 (DELAY) 0-99 (REVERB) CONFIGURATION 7: page 0-99 (DIRECT) 0-99 (SAMPLE) Alesis QuadraVerb Service Manual------ 08/13/04...
  • Page 33 PITCH MOD 3XH: EQ MOD 4XH: MIX MOD 5XH: MULTI-TAP MOD (Configuration 3 only) 6XH: " " " " " " " " " The possible modulation targets within each of the above is as follows: Alesis QuadraVerb Service Manual------ 08/13/04...
  • Page 34 TAP 3 VOLUME TAP 4 VOLUME TAP 5 VOLUME TAP 6 VOLUME TAP 7 VOLUME TAP 8 VOLUME TAP 1 PANNING TAP 2 PANNING TAP 3 PANNING TAP 4 PANNING TAP 5 PANNING TAP 6 PANNING Alesis QuadraVerb Service Manual------ 08/13/04...
  • Page 35 SPEED DEPTH DEPTH DEPTH DEPTH DEPTH FBACK FBACK FBACK FBACK CONFIGURATION 1: Target SEPARATION MOTOR SPEED CONFIGURATION 4: Target SPEED DEPTH CONFIGURATION 5: Target SPECTRUM SHIFT RING OUTPUT MIX DEL/REV IN MIX CONFIGURATION 6: Target Alesis QuadraVerb Service Manual------ 08/13/04...
  • Page 36 CONFIGURATION 3: Target LOW FREQUENCY LOW BOOST/CUT LOW MID FREQUENCY LOW MID BANDWIDTH LOW MID BOOST/CUT MID FREQUENCY MID BANDWIDTH MID BOOST/CUT HIGH MID FREQUENCY HIGH MID BANDWIDTH HIGH MID BOOST/CUT HIGH FREQUENCY HIGH BOOST/CUT Alesis QuadraVerb Service Manual------ 08/13/04...
  • Page 37 MAST FX LESLIE DELAY REVERB CONFIGURATION 2: Target MAST FX DELAY CONFIGURATION 3: Target DIRECT MAST FX PITCH DELAY CONFIGURATION 4: Target DIRECT MAST FX REVERB CONFIGURATION 5: Target DIRECT MAST FX RING MOD DELAY REVERB Alesis QuadraVerb Service Manual------ 08/13/04...
  • Page 38 32-127 (6th DIGIT NAME) 32-127 (7th DIGIT NAME) 32-127 (8th DIGIT NAME) 32-127 (9th DIGIT NAME) 32-127 (10th DIGIT NAME) 32-127 (11th DIGIT NAME) 32-127 (12th DIGIT NAME) 32-127 (13th DIGIT NAME) 32-127 (14th DIGIT NAME) Alesis QuadraVerb Service Manual------ 08/13/04...
  • Page 39 3B REVERB LOW DECAY / TAP 6 DELAY MSB RING MOD DEL/REV MIX 3C REVERB HIGH DECAY / TAP 6 DELAY LSB PAN SPEED 3D REVERB DENSITY / TAP 6 VOLUME 3E REVERB GATE / TAP 6 PAN PAN DEPTH 7C-7F (blank) Alesis QuadraVerb Service Manual------ 08/13/04...

  • Page 40: Quadraverb Service Parts List

    12.0 Quadraverb Service Parts List GROUP DESCRIPTION ALPARTNO QTYPER POSITION MANUFACTURER NOTES ASSY PCB, MAIN ASSY 8-20-0044 MAIN BOARD ASSY PCB, KEYPAD ASSY 8-20-0045 KEYPAD (BUTTON BOARD) 14 PIN DIL 11.5 0.1 CTR 4-18-1214 MAIN-LCD 12 PIN SIL 3 0.1 CTR...
  • Page 41 POT PCB (O/P) 10KB DUAL 0-09-1004 POT PCB (I/P) 1/8W 5% 0-00-0102 R1,2,4,5,43,44,58,60,16 MAIN 10K 1/8W 5% 0-00-0103 R52,53,61,62,66,75 MAIN 100K 1/8W 5% 0-00-0104 R82,83 MAIN 1/8W 5% 0-00-0105 R3,6,57 MAIN 1.1K 1/8W 5% 0-00-0112 R28,29,30,31 MAIN Alesis QuadraVerb Service Manual------ 08/13/04...
  • Page 42 9-23-1005 F/P ASSY 18 PIN DIP 0.3 4-04-0018 U12-16 MAIN 28 PIN DIP 0.6 4-06-0028 U10,18,19 MAIN 40 PIN DIP 0.6 4-06-0040 MAIN 84 PIN ASIC SOC 4-12-0084 MAIN PLCC-84 DPDT SWITCH 6-02-0001 S1 (POWER) Alesis QuadraVerb Service Manual------ 08/13/04...

  • Page 43: Index

    Q5, 12 DELAY, 16, 18, 21, 22, 23, 25, 26, 27, 28, audio pop, 6 QuadraVerb, 1, 2, 3, 4, 5, 6, 8, 12, 17, 18 29, 31, 32, 33 Quadraverb, i, ii, 3, 4, 5, 6, 8, 12, 17, 18,...
  • Page 44 U18, 4, 35 RF, 4 U19, 4, 35 Z1, 4, 6, 12, 35 RING MOD, 24, 26, 32, 33 U2, 2 Zener, 7, 35 RISC, 5 U20, 4, 35 ROM, 6, 16 U22, 5 RST, 6 Alesis QuadraVerb Service Manual------ 08/13/04...

  • Page 45: Service Manual History

    Service Manual History 6/28/94 1.00 First release. Alesis QuadraVerb Service Manual------ 08/13/04...
  • Page 46 NOTES Alesis QuadraVerb Service Manual------ 08/13/04...

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