Alesis-QuadraVerbGT-ep-sm维修电路原理图.pdf

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1、QuadraVerb GT Service ManualRevision 1.0010/17/95QuadraVerb GT Service Manual-1RadioFans.CN 收音机爱 好者资料库PREFACEThis document is intended to assist the service technician in the operation, maintenance and repair of theQuadraVerb GT guitar effects processor. This unit represents one of the building bloc

2、ks of the complete ADATsystem. Together with the QuadraVerb GT Reference Manual, this document provides a complete descriptionof the functionality and serviceability of the QuadraVerb GT. Any comments or suggestions you may havepertaining to the document are welcome and encouraged.READ THIS!In addit

3、ion to any purchase price that Alesis may charge as consideration for Alesis sellingor otherwise transferring this service manual (“Manual”) to you, if you are not a service andrepair facility (“Service Center”) authorized by Alesis in writing to be an authorized ServiceCenter, Alesis sells or trans

4、fers the Manual to you on the following terms and conditions:Only Service Centers authorized by Alesis in writing are authorized to perform service andrepairs covered by an Alesis warranty (if any), and transfer of the Manual to you does notauthorize you to be an authorized Service Center. Therefore

5、, if you perform, or if theManual is used to perform, any service or repairs on any Alesis product or partthereof, any and all warranties of Alesis as to that product and any service contractwith Alesis for that product shall be voided and shall no longer apply for suchproduct, even if your services

6、 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 yourresponsibility, and Alesis shall have no liability for any such repairs or service work. All suchservice or repairs are performed at the sole risk of the person

7、performing the serviceor repairs. You agree that all such work will be performed in a competent, professional andsafe manner at all times and to indemnify and fully hold Alesis and its successors andassigns harmless in the event of any failure to so perform.Your purchase of the Manual shall be for y

8、our own ultimate use and shall not be for purposesof resale or other transfer.As the owner of the copyright to the Manual, Alesis does not give you the right to copy theManual, and you agree not to copy the Manual without the written authorization of Alesis.Alesis has no obligation to provide to you

9、 any correction of, or supplement to, the Manual, orany new or superseding version thereof.Alesis shall have the right to refuse to sell or otherwise transfer repair parts or materials toyou in its sole discretion. You shall not use, sell or otherwise transfer spare or replacementparts supplied by A

10、lesis to you (i) to repair or be used in products manufactured for or bythird 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 theuse thereof on behalf of Alesis or in your own name.The foregoing describes

11、the entire understanding related to sale or transfer of the Manual toyou, and no other terms shall apply unless in a writing signed by an authorized representativeof Alesis.QuadraVerb GT Service Manual-2RadioFans.CN 收音机爱 好者资料库WARNINGSTO REDUCE THE RISK OF ELECTRIC SHOCK OR FIRE, DO NOT EXPOSE THIS P

12、RODUCT TOWATER OR MOISTURE.CAUTIONRISK OF ELECTRIC SHOCKDO NOT OPENThe arrowhead symbol on a lightning flash inside a triangle is intended to alert the user to thepresence of un-insulated dangerous voltage within the enclosed product which may be ofsufficient magnitude to constitute a risk of electr

13、ic 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.CAUTIONDanger of explosion if battery is incorrectly replaced.Replace only with the

14、same type or equivalent typerecommended by the equipment manufacturer.Battery Manufacturer: TadiranType: TL-5101Rating 3.6VREPAIR BY ANY PERSON OR ENTITY OTHER THAN AN AUTHORIZED ALESIS SERVICECENTER WILL VOID THE ALESIS WARRANTY.PROVISION OF THIS MANUAL DOES NOT AUTHORIZE THE RECIPIENT TO COMPETEWI

15、TH ANY ALESIS DISTRIBUTOR OR AUTHORIZED REPAIR SERVICE CENTER IN THEPROVISION OF REPAIR SERVICES OR TO BE OR MAKE REPAIRS AS AN AUTHORIZEDSERVICE CENTER.ALL REPAIRS DONE BY ANY ENTITY OTHER THAN AN AUTHORIZED ALESIS SERVICECENTER SHALL BE SOLELY THE RESPONSIBILITY OF THAT ENTITY, AND ALESIS SHALLHAV

16、E NO LIABILITY TO THAT ENTITY OR TO ANY OTHER PARTY FOR ANY REPAIRS BYTHAT ENTITY.QuadraVerb GT Service Manual-3RadioFans.CN 收音机爱 好者资料库SAFETY SUGGESTIONSCarefully read the applicable items of the operating instructions and these safety suggestions before using thisproduct. Use extra care to follow t

17、he 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 orin marking

18、s 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 thatnothing 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 pu

19、rposes. Thisplug 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 agrounding type of power outlet. Contact your electrician to replace the obsolete outlet with a grounding type of outlet instead ofdefeating the safety

20、 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 beunplugged from the AC outlet.5. Foreign Objects and Liquids. Take care not to allow liquids to spill or objects to fall into any ope

21、nings 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 prod

22、uct has adequate ventilation. Improperly ventilating the productmay 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 productand rack should be moved carefully. Quick movements, excessive

23、 force or uneven surfaces may overturn the combination which maydamage 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 inst

24、ructions for theuser. For any other service required, the product should be taken to an authorized service center as described in the operatinginstructions.12. Damage to the Product. Qualified service personnel should service the unit in certain situations including without limitationwhen:a. Liquid

25、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, ore. The enclosure of the product has been damaged.Qua

26、draVerb GT Service Manual-4RadioFans.CN 收音机爱 好者资料库General TroubleshootingWhile this manual assumes that the reader has a fundamental understanding of electronics and basictroubleshooting techniques, a review of some of the techniques used by our staff may help.1. Visual Inspection - A short visual i

27、nspection of the unit under test will often yield results without the needof 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 exercisesmany of the units primary circuit fun

28、ctions. Self test should always be done following any repair to ensurebasic functionality.3. Environmental Testing - Applying heat and cold (heat gun/freeze spray) will often reveal thermallyintermittent components (Clock crystals, I.C.s, and capacitors are particularly prone to this type of failure

29、).4. Burn in Testing - Leaving a unit running overnight often reveals intermittent failures such as capacitors thatbegin 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 solderedheaders. Rememb

30、er 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 invarious places.7. Tapping Components - Sometimes tapping on a component (particularly crystals) will cause it to fail.8. Power Down/up - Turning the un

31、it off and back on rapidly several times may reveal odd reset and/or powersupply failures.9. Reset Threshold - A Variac (variable transformer) can be used to check reset threshold levels. This can beparticularly useful in helping customers with low line problems.10. Compressors - Using a compressor/

32、limiter is often helpful when attempting to solve low level noiseproblems, 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 w

33、hen troubleshooting large sections of logic. Thisis especially true when working with older units.QuadraVerb GT Service Manual-5RadioFans.CN 收音机爱 好者资料库Table of ContentsPREFACE.IIREAD THIS!.IIWARNINGS.IIISAFETY SUGGESTIONS.IVGeneral Troubleshooting.V1.0 Schematics.72.0 Software History.93.0 GT MIDI I

34、mplementation.104.0 GT Service Parts List.26Service Manual History.30INDEX.31QuadraVerb GT Service Manual-6RadioFans.CN 收音机爱 好者资料库1 . 0 SchematicsQuadraVerb GT Service Manual-7RadioFans.CN 收音机爱 好者资料库QuadraVerb GT Service Manual-8RadioFans.CN 收音机爱 好者资料库2 . 0 Software HistoryDate Version Comments07089

35、11.00First 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 m

36、odulated via MIDI.1.02Never released.1028921.03New set of factory programs.QuadraVerb GT Service Manual-9RadioFans.CN 收音机爱 好者资料库3 . 0 GT MIDI ImplementationSystem Exclusive FormatThe Quadraverb-GT MIDI System Exclusive message format is as follows:F0System exclusive status00 00 0EAlesis manufacturer

37、 id#07Quadraverb-GT id#ccOpcode ddData : : :F7End-Of-ExclusiveOPCODES: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

38、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 0All parameters to be edited must be sent in this format (12 MIDI bytes), regardless ofthe number of bits required to transmit the value of the parameter. When the QuadraVerb-GTr

39、eceives this message, it will edit the specified parameter to the new value and display it. If thefunction and page selected does not exist in the current configuration, the command will beignored. If the value received is out of range for the parameter selected, the range will be limitedto a legal

40、value. The function and page numbers for each parameter are shown in the nextsection.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 u

41、sed totransmit 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 ofthe first byte, as follows:QuadraVerb GT Service Manual-10RadioFans.CN 收音机爱 好者资料库 SEVEN QUADRAVERB

42、 -GT BYTES: 0: A7 A6 A5 A4 A3 A2 A1 A01: B7 B6 B5 B4 B3 B2 B1 B02: C7 C6 C5 C4 C3 C2 C1 C03: D7 D6 D5 D4 D3 D2 D1 D04: E7 E6 E5 E4 E3 E2 E1 E05: F7 F6 F5 F4 F3 F2 F1 F06: G7 G6 G5 G4 G3 G2 G1 G0 TRANSMITTED AS: 0: 0 A7 A6 A5 A4 A3 A2 A11: 0 A0 B7 B6 B5 B4 B3 B22: 0 B1 B0 C7 C6 C5 C4 C33: 0 C2 C1 C0

43、D7 D6 D5 D44: 0 D3 D2 D1 D0 E7 E6 E55: 0 E4 E3 E2 E1 E0 F7 F66: 0 F5 F4 F3 F2 F1 F0 G77: 0 G6 G5 G4 G3 G2 G1 G0There are 147 bytes sent for a single data dump, which corresponds to 128 bytes ofprogram data. There are 14,629 bytes sent for a 100 program dump, which corresponds to 12,800bytes of progr

44、am data. The location of each parameter within a program is shown in the nextsection.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 INPUTBUFFER OVERFLOW This message will remain on the dis

45、play until any button is pressed.03 - MIDI Dump RequestF0 00 00 0E 07 03 F7 = 0.99 selects individual programs = 100 selects the edit buffer= 100 selects all 100 programsWhen this message is received, a MIDI data dump will be initiated, and the display willread:MIDI DATA DUMPIN PROGRESS Upon complet

46、ion of the dump, the display will return to its previously displayed page.QuadraVerb GT Service Manual-11RadioFans.CN 收音机爱 好者资料库INDIVIDUAL PARAMETER LOCATION FUNCTION AND PAGE VALUESThe following lists give the parameter locations and ranges for each of the effects in each of theconfigurations. The

47、parameter associated with a particular function and page may be dependenton both the current configuration, and the current mode of the effect (e.g., chorus, phase, etc.). Inconditions where a page relates to different parameters depending on the mode of the effect, theparameters are listed in table

48、s under each mode. All parameters are offset binary values. Thismeans that a signed parameter with a range of -99 to +99 in the display is actually stored as 0 for-99, 99 for 0, and 198 for +99.REVERB (FUNCTION 1)CONFIGURATION 0 (EQ-PCH-DL-REVERB):page0 (type) 0 (PLATE 1) 1 (ROOM 1) 2 (CHAMBER 1) 3

49、(HALL 1) 4 (REVERSE 1)10-3 (INPUT 1)0-3 (INPUT 1)0-3 (INPUT 1)0-3 (INPUT 1)0-3 (INPUT 1)20-1 (INPUT 2)0-1 (INPUT 2)0-1 (INPUT 2)0-1 (INPUT 2)0-1 (INPUT 2)30-198 (IN MIX)0-198 (IN MIX)0-198 (IN MIX)0-198 (IN MIX)0-198 (IN MIX)41-140 (PREDLY)1-140 (PREDLY)1-140 (PREDLY)1-140 (PREDLY)1-140 (PREDLY)51-1

50、98 (PRE MIX)1-198 (PRE MIX)1-198 (PRE MIX)1-198 (PRE MIX)1-198 (PRE MIX)60-99 (DECAY)0-99 (DECAY)0-99 (DECAY)0-99 (DECAY)0-99 (REV TIME)70-8 (DIFFUSION)0-8 (DIFFUSION)0-8 (DIFFUSION)0-8 (DIFFUSION)0-8 (DIFFUSION)80-8 (DENSITY)0-8 (DENSITY)0-8 (DENSITY)0-60 (LOW DEC)0-8 (DENSITY)90-60 (LOW DEC)0-60 (