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Summary of Contents for Alesis MIDIVERB IV
- Page 1 Alesis MIDIVERB IV STEREO EFFECTS PROCESSOR Service Manual V 1.00 6/13/95 Alesis MidiVerb IV Service Manual‘ 03/05/99...
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Page 2: Preface
Your purchase of the Manual shall be for your own ultimate use and shall not be for purposes of resale or other transfer. 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: Panasonic/Matsushita Type: BR2325 Rating 3V, 5mA 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 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 MidiVerb IV Service Manual‘ 03/05/99... -
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
EDIT BUFFER DATA..............17 ALL USER PROGRAMS DATA..........17 SINGLE PROGRAM DATA ............17 STORE PROGRAM DATA ............17 NOTES ..................17 12.00 Service Parts List..............18 13.00 Service Manual History ............. 20 INDEX....................21 Alesis MidiVerb IV Service Manual‘ 03/05/99... -
Page 7: General Description
1.00 General Description The MidiVerb IV is a continuation of the Alesis line of quality studio signal processors. As is the tradition at Alesis, much of unit’s complex functions are incorporated into an LSI ASIC, reducing parts count and cost, as well as increasing reliability and serviceability. The MidiVerb IV pushes the concept of integration further than any previous processors, adding hardware to the ASIC that was previously discreet components. -
Page 8: Output
Note that this product is specifically designed to take advantage of the "A" version of the AKM device. This means that the unit is not compatible with the older AKM-4318 (no "A" suffix) part. Alesis MidiVerb IV Service Manual‘ 03/05/99... -
Page 9: Digital Signal Paths
This latch (which was a discreet component in earlier Alesis products) has now been incorporated into the M4 ASIC. (See also MICROALE, LSADDR0-7.) MICROAD12, 15>... - Page 10 SRAMD0-7> SRAM Data 0-7 - Data buss of the SRAM directly under 45-52 the control of the M4 ASIC. XTALIN> XTAL IN - 12MHz crystal oscillator. XTALOUT> XTAL OUT - 12MHz crystal oscillator. LCDEN> LCD ENable - Enables the LCD’s internal data latch. Alesis MidiVerb IV Service Manual‘ 03/05/99...
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Page 11: The Front Panel
To remove the data encoder it is necessary to remove the knob first. In order to do this without tearing up the front panel, use the holes in the back of the frame to push the knob off with a small screwdriver (see diagram 2). Alesis MidiVerb IV Service Manual‘ 03/05/99... - Page 12 Diagram 1 Diagram 2 Alesis MidiVerb IV Service Manual‘ 03/05/99...
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Page 13: Test Procedures
7.00 Test Procedures If possible, user data should be saved (an Alesis DataDisk is recommended for this task) prior to any servicing. This, of course, may not always be possible (i.e. dead power supply, bad reset signal, corrupt data, etc.). Saving user data may also be accomplished after unit functionality is restored (i.e. -
Page 14: Troubleshooting
Faulty ADC. Troubleshoot and repair as necessary. Faulty DAC. Troubleshoot and repair as necessary. No MIDI in. Faulty opto-isolator. Replace and retest. Faulty 8031. Replace and retest. No MIDI out. Faulty 8031. Replace and retest. Alesis MidiVerb IV Service Manual‘ 03/05/99... -
Page 15: Schematics
9.00 Schematics Alesis MidiVerb IV Service Manual‘ 03/05/99... -
Page 19: Software History
- Preset 00 "Bypass" now uses a STEREOPITCHSHFT configuration with levels at 0. The old program didn’t work when Dry Defeat was enabled. - Preset 08 "TapeEcho" changed the delay time to 400mS. - Renamed User 109 from "90212Chr" to "90210Chr". Alesis MidiVerb IV Service Manual‘ 03/05/99... - Page 20 - Renamed User 106 from "Model147" to "Model122". - Now to finish the Switch/Encoder Test you press Page+A (it used to be Input+Output). V1.00, 11/19/94, Checksum $77C8 - First Production Release. Alesis MidiVerb IV Service Manual‘ 03/05/99...
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Page 21: Midi Implementation
System Exclusive Format Software Version 1.02 February 17, 1995 OVERVIEW All MidiVerb 4 system exclusive messages have the following format: System Exclusive status $00 $00 $0E Alesis manufacturer ID MidiVerb 4 ID Channel Opcode Data End of Exclusive THE CHANNEL BYTE For messages originating from the MidiVerb 4 the system exclusive channel will always be the same as the standard MIDI channel, and can be adjusted by the user via the global utility functions. -
Page 22: System Info Data
System Status Byte Bit 0 Thru (0 = Off, 1 = On) Bit 1 Omni Bit 2 Bypassed Bit 3 Cascade Bit 4 Comparing Bit 5 DON’T ALTER Bit 6 Edited Bit 7 0 Alesis MidiVerb IV Service Manual 03/05/99... -
Page 23: Program Table Data
Edit Buffer into a specified User memory location. The data byte contains the User Program number 0-127. NOTES When you send MIDI Sysex "All" from the MidiVerb 4’s Util Mode this sends four messages total: System Info, Program Table, Edit Buffer, and All User Programs. Alesis MidiVerb IV Service Manual 03/05/99... -
Page 24: Service Parts List
STRIP FOAM (F/P) 7 x 185mm 9-23-1017 STRIP FOAM (SIDE) 7x95mm D4 9-03-1060 CASE TOP 150MM D4 9-03-1105 CASE BOTTOM M4 9-03-1138 PANEL FRONT M4 9-03-1165 CLIP STRIP RETAINER 9-58-1007 PANEL SIDE/RACK EAR 150mm Alesis MidiVerb IV Service Manual 03/05/99... - Page 25 RES 220 OHM 1/8W 5% 1206 0-10-0622 RES 6.2K OHM 1/8W 5% 1206 0-10-0682 RES 6.8K OHM 1/8W 5% 1206 R1-4 0-10-0903 RES 91K OHM 1/8W 5% 1206 6-02-0002 SWITCH DPDT MAIN 2-03-4401 TRANS 2N4401 NPN MAIN Q4, Q5 Alesis MidiVerb IV Service Manual 03/05/99...
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Page 26: Service Manual History
13.00 Service Manual History 6/13/95 V1.00 1st Release. Alesis MidiVerb IV Service Manual... -
Page 27: Index
R5, 3, 19 J4, 1 C3, 2 R51, 2 C32, 1 R52, 2 keypad decoding, 3 C35, 1, 2 R56, 2 C4, 1 R60, 2, 19 LCD, 1, 3, 4, 5, 7, 8, 13 C40, 2 Alesis MidiVerb IV Service Manual‘ 03/05/99... - Page 28 2 U14, 3, 19 Sigma-Delta, 2 U2, 3, 18 XTALIN, 4 SRAM, 1, 3, 4, 7, 8, 19 U6A, 1 XTALOUT, 4 SRAMA0-16, 4 U6B, 1 SRAMCE, 3 U7A, 2 SRAMD0-7, 4 Alesis MidiVerb IV Service Manual‘ 03/05/99...
- Page 29 NOTES Alesis MidiVerb IV Service Manual‘ 03/05/99...
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