Alesis-DEQ830ME4-eq-sm维修电路原理图.pdf

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1、ALESIS DEQ830 (ME4) Service Manual P/N: 8-31-0117-A ATTENTION! THIS DOCUMENT CONTAINS SENSITIVE PROPRIETARY INFORMATION. ALL RECIPIENTS MUST HAVE A CURRENT NON-DISCLOSURE AGREEMENT ON FILE WITH ALESIS DISTRIBUTION, LLC. DO NOT DISTRIBUTE THIS DOCUMENT IN ELECTRONIC FORM The information in this docum

2、ent contains privileged and confidential information. It is intended only for the use of those authorized by Alesis. If you are not the authorized, intended recipient, you are hereby notified that any review, dissemination, distribution or duplication of this document is strictly prohibited. If you

3、are not authorized, please contact Alesis and destroy all copies of this document. You may contact Alesis at supportA. Copyright 2002 Alesis Distribution, LLC Confidential Alesis ME4 Service Manual 8-31-0117-A RadioFans.CN 收音机爱 好者资料库Preface This document is intended to assist the service technician

4、in the operation, maintenance and repair of the Alesis device. Together with the User Reference Manual, this document provides a complete description of the functionality and serviceability of the Device. Any comments or suggestions you may have pertaining to the document are welcome and encouraged.

5、 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

6、, 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

7、 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

8、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 performe

9、d 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

10、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. A

11、lesis 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 tran

12、sfer 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 Ale

13、sis 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. All Trademarks are property of their respective companies. Confidential Ale

14、sis ME4 Service Manual 8-31-0117-A RadioFans.CN 收音机爱 好者资料库Warnings TO REDUCE THE RISK OF ELECTRIC SHOCK OR FIRE, DO NOT EXPOSE THIS PRODUCT TO WATER OR MOISTURE. The arrowhead symbol on a lightning flash inside a triangle is intended to alert the user to the presence of un-insulated dangerous voltag

15、e 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 accompani

16、es the product. 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

17、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.Confidential Ale

18、sis ME4 Service Manual 8-31-0117-A RadioFans.CN 收音机爱 好者资料库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

19、. 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

20、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. 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. 4. Foreign Objects and Li

21、quids. 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 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 producin

22、g equipment. 7. 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. 8. Mounting. The product should only be used with a rack which the manufacturer recommends. The combi

23、nation 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. 9. Cleaning. The product should only be cleaned as the manufacturer recommends. 10. Service. The user should o

24、nly 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. 11. Damage to the Product. Qualified service personnel

25、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 pe

26、rformance or does not operate normally, or e. The enclosure of the product has been damaged. Confidential Alesis ME4 Service Manual 8-31-0117-A RadioFans.CN 收音机爱 好者资料库Confidential Alesis ME4 Service Manual 8-31-0117-A General Troubleshooting While this manual assumes that the reader has a fundamenta

27、l understanding of electronics and basic troubleshooting techniques, a review of some of techniques may help. 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). Se

28、lf 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. Environmental Testing - Applying heat and cold (heat gun/freez

29、e spray) will often reveal thermally intermittent components (Clock crystals, I.C.s, and capacitors are particularly prone to this type of failure). Burn in Testing - Leaving a unit running overnight often reveals intermittent failures such as capacitors that begin to leak excess current after a sig

30、nificant amount of time. Cable Checks - Wiggling cables can reveal intermittent failures such as loose cables or poorly soldered headers. Remember to check power supply cables as well. Flexing the PC Board - Poor solder joints and broken traces can often be found by pressing the PC Board in various

31、places. Tapping Components - Sometimes tapping on a component (particularly crystals) will cause it to fail. Power Down/up - Turning the unit off and back on rapidly several times may reveal odd reset and/or power supply failures. Reset Threshold - A Variac (variable transformer) can be used to chec

32、k reset threshold levels. This can be particularly useful in helping customers with low line problems. Compressors - Using a compressor/limiter is often helpful when attempting to solve low level noise problems, as well as assisting with DAC adjustments. Sweep Tests - Sweep generators are very usefu

33、l in checking the frequency response envelopes of anti-aliasing filters. Piggybacking - Piggybacking I.C.s is particularly useful when troubleshooting large sections of logic. This is especially true when working with older units. Assembly/Disassembly Organization - When removing assemblies, organiz

34、e screws and clips with the assemblies that they were removed from. Organizer trays save a lot of time during re-assembly since similar screws and clips will not be mixed with each other. RadioFans.CN 收音机爱 好者资料库 SPECIFICATION Rear Panel I/O (switchable) Analog: Input Connectors: 8 balanced 1/4” TRS

35、jacks Output Connectors: 8 balanced 1/4” TRS jacks Digital: Input Connector: 1 ADAT Optical Output Connector: 1 ADAT Optical Switch set to +4: Nominal input level: +4dBu (-15dBFS) Maximum input level: +19dBu (6.9 Vrms) Nominal Output Level: +4dBu (-15dBFS) Maximum Output Level: +19dBu (6.9 Vrms) Swi

36、tch set to 10: Nominal input level: -10dBV (-16dBFS) Maximum input level: +6dBV (2.0 Vrms) Nominal Output Level: -10dBV (-16dBFS) Maximum Output Level: +6dBV (2.0 Vrms) Input impedance: 10 Output Impedance: 22 MIDI: MIDI Input: 1 5-pin female DIN MIDI Output: 1 5-pin female DIN Audio Performance Sig

37、nal To Noise Ratio: 100dB A-Weighted, Analog In to Analog Out THD+N: EEPROM - COL - ROW - ALL - MIDI - A. - DIG A. -RESET - DONE DIAG Message Informs user “Prepare for tests.”. EEPROM Eeprom Test When entering EEPROM test, EEPROM test is run automatically. Unit displays EEPROM FAIL or EEPROM PASS. C

38、OL LED Test Turning the VALUE encoder clockwise rotates through LED columns. ROW LED Test Turning the VALUE encoder clockwise rotates through LED rows. ALL LED Test When entering ALL test, unit turns all LEDs on. MIDI MIDI Test When entering MIDI test, MIDI test is run automatically. Unit displays M

39、IDI FAIL or MIDI PASS. Requires MIDI loopback cable to PASS. A. Audio Fidelity Test When entering AUDIO test, unit configures dsp for bypass to run audio tests. This uses an abbreviated title, “A,” to reduce noise caused by the led matrix scanning. DIG A. Digital Audio Test When entering DIG AUDIO t

40、est, digital audio test is run automatically. Unit displays DIG PASS or DIG FAIL. Requires ADAT Optical loopback cable PASS. to RESET EEPROM Reset Allows user to reset EEPROM. Push encoder to RESET eeprom. Unit displays 0 to 99 in the 7 segment display, and is finished when the display reaches “99”.

41、 DONE Message Informs user “Done with tests.”. 2) Rear Panel Sub Assembly Test - Digital Items Required 1 ME4 Rear Panel (DUT) 1 Known Good ME4 Front Panel Sub-Assembly (Front Panel) This front panel should have been reset as described in Section 7 “RESET.” 1 Known Good BB01 Power Supply with intern

42、al 4-pin power cable 1 IEC power cable 1 ADAT Optical cable 1 24 pin DIL cable for Rear Panel to Front Panel connection. 1 5-pin DIN Male to Male standard MIDI cable Assembly 1) Connect 24 pin DIL cable from the Front Panel J6 to the DUT J12. Be sure that the Pin 1 stripe on the cable is oriented co

43、rrectly on both sub-assemblies. 2) Connect the 4 pin clip-lock power cable from the BB01 Power Supply to the DUT J13. 3) Connect the 5-pin DIN Male to Male MIDI Cable from the MIDI IN jack to the MIDI OUT jack. 4) Sub Assembly is ready for testing. Continue with Power Test. Re ar Panel Sub Assembly

44、Test DIGITAL CONT Power Test 1) Before applying power, visually inspect the DUT for major assembly problems. Verify that U9 has a metal heat-sink that has been properly screwed tightly to the metal tab with heat conducting gel. Verify that U7, U5 has been installed correctly and that the metal tab h

45、as been screwed to the HEAT SINK plane and is making a good connection to the plane. Verify all Electrolytic capacitors for correct orientation. C35, C55, C56, C40, C41, C165 C5, C13, C10, C65, C66, C64, C101, C102, C100, C86, C85, C87 C52, C50, C47, C49, C54, C53, C57, C152, C157, C156, C154, C155,

46、 C159, C160, C161 Problems with this inspection indicate that the DUT has FAILED. Failure of this inspection indicate that the DUT cannot continue further testing. 2) Plug the IEC Power Cable into a power source and BB01. Verify that the front panel LEDs show normal power up message, “DEQ830” on the

47、 left side. Verify that the LEDs do not flicker and are of a consistent brightness. Problems with this inspection indicates that the rear panel is not supplying the correct voltage to the Front Panel. Double check that the 24 pin DIL cable has been installed correctly. If this is not the problem, th

48、en the DUT has FAILED. Failure of this test indicates that this sub-assembly cannot continue further testing. Quickly check the ICs on the Front Panel. If any are hot, or if there is any other indication that the Front Panel may have been damaged (burning smell, etc.), follow QC procedures to check

49、the Front Panel, because the faulty DUT power supply may have damaged the Known Good Front Panel. 3) Unplug the IEC Power Cable to the BB01 Power Supply. Continue with Audio Fidelity Test if DUT has not failed. Rear Panel Sub Assembly Test DIGITAL CONT Digital and MIDI Test 1) Press the UTILITY and

50、CHANNEL 7 buttons on the Known Good ME4 Front Panel Sub-Assembly and hold these buttons during Step 2. When started in this manner, the unit will enter Factory Test Mode. Please Note Section 1b on the Diagnostic Mode. 2) Plug the IEC Power Cable into a power source and BB01. Verify that the front pa