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1、Alesis QuadraVerb II 2.00 I 07/19/06 ALESIS QUADRAVERB II SERVICE MANUAL V2.00 12/12/95 收音机爱好者资料库 Ra d i o Fa n s .CN Alesis QuadraVerb II 2.00 II 07/19/06 PREFACE This document is intended to assist the service technician in the operation, maintenance and repair of the QuadraVerb II Digital Stereo

2、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. WARNINGS TO REDUCE THE RISK OF ELECTRIC SHOCK

3、 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 mag

4、nitude 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 in

5、correctly replaced. Replace only with the same type or equivalent type recommended by the equipment manufacturer. 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. PROVIS

6、ION 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 S

7、HALL 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. 收音机爱好者资料库 Ra d i o Fa n s .CN Alesis QuadraVerb II 2.00 III 07/19/06 SAFETY SUGGESTIONS Carefully read the applicable items of the operating instr

8、uctions 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 conne

9、cted to a power supply which is described either in the operating instructions or in markings on the product. 2. 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

10、 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. 3. Periods of Non-use. If the pr

11、oduct is not used for any significant period of time, the products AC power supply cord should be unplugged from the AC outlet. 4. Foreign Objects and Liquids. Take care not to allow liquids to spill or objects to fall into any openings of the product. 5. Water or Moisture. The product should not be

12、 used near any water or in moisture. 6. Heat. Do not place the product near heat sources such as stoves, heat registers, radiators or other heat producing equipment. 7. Ventilation. When installing the product, make sure that the product has adequate ventilation. Improperly ventilating the product m

13、ay cause overheating, which may damage the product. 8. 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 ma

14、y damage the product and rack combination. 9. Cleaning. The product should only be cleaned as the manufacturer recommends. 10. 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 pr

15、oduct should be taken to an authorized service center as described in the operating instructions. 11. 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.

16、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. 收音机爱好者资料库 Ra d i o Fa n s .CN Alesis QuadraVerb II 2.0

17、0 IV 07/19/06 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

18、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 alway

19、s 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 - Lea

20、ving 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 suppl

21、y 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

22、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 ofte

23、n 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 trouble

24、shooting large sections of logic. This is especially true when working with older units. Alesis QuadraVerb II 2.00 V 07/19/06 Table Of Contents PREFACE.ii WARNINGS.ii SAFETY SUGGESTIONS .iii General Troubleshooting.iv 1.00 General Description.1 2.00 Power Supply .1 2.10 PUP Circuit.1 3.00 Analog Sig

25、nal Paths .2 3.10 Audio Input Section.2 3.20 Audio Output Section .2 4.00 A-D/D-A Converters.3 4.10 Analog to Digital.3 4.20 Digital to Analog.3 5.00 Digital Signal Paths.4 5.10 The 8031.4 5.11 Reset.4 5.12 SRAM.5 5.20 DSP.5 5.21 Clock Sources and VCOs.6 5.30 MIDI Hardware.6 5.40 Encoder Interface.7

26、 5.50 Footswitch interface .7 6.00 Appendix 1 Updates and Corrections.A-1 6.10 Important Production Changes.A-1 6.11 VCO Mod .A-1 6.12 SRAM Current Increase.A-2 6.13 Main PCB change. .A-2 6.14 Reset Circuit Change.A-2 6.15 Revision A pre-VCO chip units still work. 2. The test for the sampling hardwa

27、re mod has been added to the self test routines. 3. The footswitch local generator wont retain modulation after power-down. 4. If adding “quick” routes causes a “DSP FULL” message the display is updated immediately to not show the routes. 5. On power-up the FX RAM (DRAM) is completely cleared so qui

28、ck power cycles wont cause stuttering audio remnants to play. 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 E-

29、1 07/19/06 10.00 Appendix 5 MIDI Implementation 10.10 V1.0X V1.0X September 9, 1994 SYSTEM EXCLUSIVE FORMAT The QuadraVerb II MIDI System Exclusive message format is as follows: F0 System exclusive status 00 00 0E Alesis manufacturer id# 0F QuadraVerb id# cc Opcode dd Data : : : : F7 End-Of-Exclusiv

30、e OPCODES: 01 - MIDI Edit F0 00 00 0E 0F 01 F7 = 0= PARAMETER, 1= MIX, 2= GLOBAL = (1-8) # of block to be edited. Doesnt matter for GLOBAL edits. = (1-#of last page under function) page # for value to be edited. = (1-#of last parameter on page) parameter # of value is in format described below. It i

31、s a 16-bit value, which is transmitted in three MIDI bytes, LSB first. TWO QUADRAVERB II BYTES: 0: A7 A6 A5 A4 A3 A2 A1 A0 (LSB) 1: B7 B6 B5 B4 B3 B2 B1 B0 (MSB) TRANSMITTED AS: 0: 0 A7 A6 A5 A4 A3 A2 A1 1: 0 A0 B7 B6 B5 B4 B3 B2 2: 0 B1 B0 0 0 0 0 0 02 - MIDI User Program Dump F0 00 00 0E 0E 02 F7

32、= 0.99 selects individual user programs, 100 selects edit 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 b

33、eginning with the most significant bit of the first byte, as follows: Alesis QuadraVerb II 2.00 E-2 07/19/06 SEVEN QUADRAVERB II 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:

34、 G7 G6 G5 G4 G3 G2 G1 G0 TRANSMITTED AS: 0: 0 A6 A5 A4 A3 A2 A1 A0 1: 0 B5 B4 B3 B2 B1 B0 A7 2: 0 C4 C3 C2 C1 C0 B7 B6 3: 0 D3 D2 D1 D0 C7 C6 C5 4: 0 E2 E1 E0 D7 D6 D5 D4 5: 0 F1 F0 E7 E6 E5 E4 E3 6: 0 G0 F7 F6 F5 F4 F3 F2 7: 0 G7 G6 G5 G4 G3 G2 G1 There are 306 data bytes sent for a single program

35、dump, which corresponds to 256 bytes of program data. With the header, the total number of bytes transmitted with a program dump is 314. The location of each parameter within a program dump is shown in the next section: QuadraVerb II Program Data Format. 03 - MIDI User Program Dump Request F0 00 00

36、0E 0F 03 F7 = 0.99 selects individual user programs, 100 selects current edit, 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 (

37、02) of the program number selected. 07 - MIDI Global Data Dump F0 00 00 0E 0F 07 F7 is in the same format as described in 00, but with a different number of bytes due to the difference in the global parameter size. The total number of data bytes sent for a global data dump is 16, which corresponds t

38、o 14 bytes of global data. 08 - MIDI Global Data Dump Request F0 00 00 0E 0F 08 F7 When received, the QuadraVerb II will respond to this message with a MIDI global data dump (07). 09 - MIDI Bypass or Compare F0 00 00 0E 0F 09 F7 = 0= BYPASS, 1= COMPARE = 0= function off, 1= function on When received

39、, the QuadraVerb II will respond to this message by turning BYPASS/COMPARE OFF/ON. Alesis QuadraVerb II 2.00 E-3 07/19/06 0A - MIDI DSP Error Message F0 00 00 0E 0F 0A F7 = 1= “EFFECT MEMORY IS FULL” 2= “OUT OF LFOs” 4= “DSP IS FULL” 8= “BLOCK COMBINATION NOT ALLOWED” PARAMETER FORMAT The following

40、specific parameter information shows the locations in which each parameter resides after unpacking the data from its 7 bit MIDI format into the 8 bit format as described in opcode 00, program data dump. GLOBAL DATA FORMAT The Global parameters are comprised of 14 bytes of data. Unlike the Program, t

41、he Global parameters are not packed so that each parameter occupies its own byte. This results in unused bits for most global bytes. These bits must remain at 0. For direct parameter editing (sysex command 01H), the Page# and Parameter# are given in the table below. The Function# should be set to 2

42、(=Global), and the Block# should be 1-8. # Parameter name Page Parm lo lim hi lim bits bit address 0. LCD contrast 1 1 1 10 8 0:7-0:0 1. Footswitch range head 2 1 0 199 8 1:7-1:0 2. Footswitch range tail 2 2 0 199 8 2:7-2:0 3. VU meter peak hold 3 1 0 1 8 3:7-3:0 4. Input audio source 4 1 0 1 8 4:7-4:0 5. Sample clock source 5 1 0 1 8 5:7