Alesis_quadraverbgt 电路图 维修原理图.pdf

QuadraVerb GT Service Manual Revision 1.00 10/17/95 QuadraVerb GT Service Manual-1 收音机爱好者资料库 Ra d i o Fa n s .CN PREFACE This document is intended to assist the service technician in the operation, maintenance and repair of the QuadraVerb GT guitar effects processor. This unit represents one of the building blocks of the complete ADAT system. Together with the QuadraVerb GT Reference Manual, this document provides a complete description of the functionality and serviceability of the QuadraVerb GT. Any comments or suggestions you may have pertaining to the document are welcome and encouraged. READ THIS! In addition to any purchase price that Alesis may charge as consideration for Alesis selling or otherwise transferring this service manual (“Manual”) to you, if you are not a service and repair facility (“Service Center”) authorized by Alesis in writing to be an authorized Service Center, Alesis sells or transfers the Manual to you on the following terms and conditions: Only Service Centers authorized by Alesis in writing are authorized to perform service and repairs covered by an Alesis warranty (if any), and transfer of the Manual to you does not authorize you to be an authorized Service Center. Therefore, if you perform, or if the Manual is used to perform, any service or repairs on any Alesis product or part thereof, any and all warranties of Alesis as to that product and any service contract with Alesis for that product shall be voided and shall no longer apply for such product, even if your services or repairs were done in accordance with the Manual. All service or repairs done 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 and its successors and assigns harmless in the event of any failure to so perform. 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. Alesis has no obligation to provide to you any correction of, or supplement to, the Manual, or any new or superseding version thereof. Alesis shall have the right to refuse to sell or otherwise transfer repair parts or materials to you in its sole discretion. You shall not use, sell or otherwise transfer spare or replacement parts supplied by Alesis to you (i) to repair or be used in products manufactured for or by third parties or (ii) to any third parties for any purpose. You shall not make any warranties or guarantees with respect to the products of Alesis or the use thereof on behalf of Alesis or in your own name. The foregoing describes the entire understanding related to sale or transfer of the Manual to you, and no other terms shall apply unless in a writing signed by an authorized representative of Alesis. QuadraVerb GT Service Manual-2 收音机爱好者资料库 Ra d i o Fa n s .CN WARNINGS TO REDUCE THE RISK OF ELECTRIC SHOCK OR FIRE, DO NOT EXPOSE THIS PRODUCT TO WATER OR MOISTURE. CAUTION RISK OF ELECTRIC SHOCK DO NOT OPEN The arrowhead symbol on a lightning flash inside a triangle is intended to alert the user to the presence of un-insulated dangerous voltage within the enclosed product which may be of sufficient magnitude to constitute a risk of electric shock to persons. The exclamation point inside a triangle is intended to alert the user to the presence of important operating, maintenance and servicing instructions in the literature which accompanies the product. CAUTION Danger of explosion if battery is incorrectly replaced. Replace only with the same type or equivalent type recommended by the equipment manufacturer. 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. ALL REPAIRS DONE BY ANY ENTITY OTHER THAN AN AUTHORIZED ALESIS SERVICE CENTER SHALL BE SOLELY THE RESPONSIBILITY OF THAT ENTITY, AND ALESIS SHALL HAVE NO LIABILITY TO THAT ENTITY OR TO ANY OTHER PARTY FOR ANY REPAIRS BY THAT ENTITY. QuadraVerb GT Service Manual-3 收音机爱好者资料库 Ra d i o Fa n s .CN SAFETY SUGGESTIONS Carefully read the applicable items of the operating instructions and these safety suggestions before using this product. Use extra care to follow the warnings written on the product itself and in the operating instructions. Keep the operating instructions and safety suggestions for reference in the future. 1. Power Source. The product should only be connected to a power supply which is described either in the operating instructions or in markings on the product. 2. Power Cord Protection. AC power supply cords should be placed such that no one is likely to step on the cords and such that nothing will be placed on or against them. 3. Grounding the Plug. This product has a 3-wire grounding type of plug (a plug with a grounding pin) for safety purposes. This plug can only be used in a grounding power outlet. If the plug does not insert into the outlet you are using, the outlet probably is not a grounding type of power outlet. Contact your electrician to replace the obsolete outlet with a grounding type of outlet instead of defeating the safety feature of the grounding type of plug. 4. Periods of Non-use. If the product is not used for any significant period of time, the products AC power supply cord should be unplugged from the AC outlet. 5. Foreign Objects and Liquids. Take care not to allow liquids to spill or objects to fall into any openings of the product. 6. Water or Moisture. The product should not be used near any water or in moisture. 7. Heat. Do not place the product near heat sources such as stoves, heat registers, radiators or other heat producing equipment. 8. 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. 9. Mounting. The product should only be used with a rack which the manufacturer recommends. The combination of the product and rack should be moved carefully. Quick movements, excessive force or uneven surfaces may overturn the combination which may damage the product and rack combination. 10. Cleaning. The product should only be cleaned as the manufacturer recommends. 11. Service. The user should only attempt the limited service or upkeep specifically described in the operating instructions for the user. For any other service required, the product should be taken to an authorized service center as described in the operating instructions. 12. Damage to the Product. Qualified service personnel should service the unit in certain situations including without limitation when: a. Liquid has spilled or objects have fallen into the product, b. 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. QuadraVerb GT Service Manual-4 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. 1. 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). 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. 3. 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). 4. 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. 5. Cable Checks - Wiggling cables can reveal intermittent failures such as loose cables or poorly soldered headers. Remember to check power supply cables as well. 6. Flexing the PC Board - Poor solder joints and broken traces can often be found by pressing the PC Board in various places. 7. Tapping Components - Sometimes tapping on a component (particularly crystals) will cause it to fail. 8. Power Down/up - Turning the unit off and back on rapidly several times may reveal odd reset and/or power supply failures. 9. 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. 10. Compressors - Using a compressor/limiter is often helpful when attempting to solve low level noise problems, as well as assisting with DAC adjustments. 11. Sweep Tests - Sweep generators are very useful in checking the frequency response envelopes of anti- aliasing filters. 12. Piggybacking - Piggybacking I.C.s is particularly useful when troubleshooting large sections of logic. This is especially true when working with older units. QuadraVerb GT Service Manual-5 Table of Contents PREFACE.II READ THIS!.II WARNINGS.III SAFETY SUGGESTIONS.IV General Troubleshooting.V 1.0 Schematics.7 2.0 Software History.9 3.0 GT MIDI Implementation.10 4.0 GT Service Parts List.26 Service Manual History.30 INDEX.31 QuadraVerb GT Service Manual-6 1 . 0 Schematics QuadraVerb GT Service Manual-7 QuadraVerb GT Service Manual-8 2 . 0 Software History Date Version Comments 0708911.00First production release. 0522921.011) Adds global cabinet simulator controls. 2) Fixes erroneous setting of preamp parameters when a program using the sampling configuration is recalled. 3) Fixes distorted audio when a program using the reverb configuration has its reverb chorus speed, or depth modulated via MIDI. 1.02Never released. 1028921.03New set of factory programs. QuadraVerb GT Service Manual-9 3 . 0 GT MIDI Implementation System Exclusive Format The Quadraverb-GT MIDI System Exclusive message format is as follows: F0System exclusive status 00 00 0EAlesis manufacturer id# 07Quadraverb-GT id# ccOpcode ddData : : : F7End-Of-Exclusive OPCODES: 01 - MIDI Editing F0 00 00 0E 07 01F7 = 1=reverb,2=delay,3=pitch,4=eq,7=config, 8=mix, 9=name/mod, 10=preamp = 0.n where n is the maximum page # for the selected function = new parameter value in the following format: Data: B7 B6 B5 B4 B3 B2 B1 B0 (MSB) A7 A6 A5 A4 A3 A2 A1 A0 (LSB) Sent: 0 A7 A6 A5 A4 A3 A2 A1 0 A0 B7 B6 B5 B4 B3 B2 0 B1 B0 0 0 0 0 0 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-GT 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. If the value received is out of range for the parameter selected, the range will be limited to a legal value. The function and page numbers for each parameter are shown in the next section. 02 - MIDI Data Dump F0 00 00 0E 07 02 F7 = 0.99 selects individual programs = 100 selects the edit buffer = 100 selects all 100 programs is in a packed format in order to optimize data transfer. Eight MIDI bytes are used to transmit each block of 7 QuadraVerb-GT 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: QuadraVerb GT Service Manual-10 SEVEN QUADRAVERB -GT 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 A7 A6 A5 A4 A3 A2 A1 1: 0 A0 B7 B6 B5 B4 B3 B2 2: 0 B1 B0 C7 C6 C5 C4 C3 3: 0 C2 C1 C0 D7 D6 D5 D4 4: 0 D3 D2 D1 D0 E7 E6 E5 5: 0 E4 E3 E2 E1 E0 F7 F6 6: 0 F5 F4 F3 F2 F1 F0 G7 7: 0 G6 G5 G4 G3 G2 G1 G0 There are 147 bytes sent for a single data dump, which corresponds to 128 bytes of program data. There are 14,629 bytes sent for a 100 program dump, which corresponds to 12,800 bytes of program data. The location of each parameter within a program is shown in the next section. When the QuadraVerb-GT receives a data dump message, the display reads: LOADING MIDI DATA . Should the s MIDI input buffer overflow, the display will read: MIDI INPUT BUFFER OVERFLOW This message will remain on the display until any button is pressed. 03 - MIDI Dump Request F0 00 00 0E 07 03 F7 = 0.99 selects individual programs = 100 selects the edit buffer = 100 selects all 100 programs When this message is received, a MIDI data dump will be initiated, and the display will read: MIDI DATA DUMP IN PROGRESS Upon completion of the dump, the display will return to its previously displayed page. QuadraVerb GT Service Manual-11 INDIVIDUAL PARAMETER LOCATION FUNCTION AND PAGE VALUES The following lists give the parameter locations and rang