Linn-LK140-int-ffg 电路图 维修手册.pdf

《Linn-LK140-int-ffg 电路图 维修手册.pdf》由会员分享，可在线阅读，更多相关《Linn-LK140-int-ffg 电路图 维修手册.pdf（11页珍藏版）》请在收音机爱好者资料库上搜索。

1、2nd June 1999 Page1 Copyright 1999 Linn Products Limited. All rights reserved. LK85 & LK140 Service ManualLK85 & LK140 Service Manual Contents INTRODUCTION . 2 ABOUT THIS MANUAL. 2 RETAILER & DISTRIBUTOR OBLIGATIONS . 2 HOW TO USE THIS MANUAL. 2 INSTALLATION. 3 IMPORTANT SAFETY INFORMATION. 3 INSTAL

2、LATION . 3 PLACEMENT. 3 POWER-UP PROBLEMS. 4 POWER UP PROBLEMS . 4 FUSE BLOWING. 5 PROTECTION (TRIPPING) PROBLEMS . 7 IMPORTANT INFORMATION ABOUT TRIP PLEASE READ BEFORE FAULT FINDING ON TRIP PROBLEM. 7 TRIP PROBLEMS FAULT TABLE. 8 STAND-BY PROBLEMS. 9 INFORMATION ABOUT THE STAND-BY FACILITY . 9 STA

3、ND-BY PROBLEM TABLE. 9 AMPLIFIER & AUDIO PROBLEMS.11 AMPLIFIER & AUDIO PROBLEMS.11 DC AT THE OUTPUT.11 Downloaded from www.M manuals search engine RadioFans.CN 收音机爱 好者资料库 2nd June 1999 Page2 Copyright 1999 Linn Products Limited. All rights reserved. Contents Introduction About this manual This manua

4、l is designed to help you as a Linn Retailer or Distributor to provide the best possible service for your customer should a problem arise. The LK85 and LK140 share many design aspects and parts, so it makes sense to cover both amplifiers in the one manual. Most faults, cures etc apply to both amps a

5、nd if no distinction is mentioned, it is safe to assume that it is applicable to both amps. They are not identical, however and any differences will be mentioned as they arise throughout the manual. If you have any suggestions or comments regarding this manual, please contact Paul ONeill at Linn Pro

6、ducts Ltd: By E-mailPAULOLINN.CO.UK By Phone+44 (0) 141 303 5005 By Fax+44 (0) 141 644 4262 Marked for attention of Paul ONeill Retailer & Distributor Obligations Linn Specialist Retailers or Distributors are obliged to carry out the repairs in this manual under the terms of the contract & warranty

7、agreements. You should return a faulty product to Linn for repair, only if the fault is not covered in this Service Manual. If a product, which is under warranty, is returned to Linn for repair and the fault is covered in the service manual, Linn may levy a charge and this charge should not be passe

8、d to the customer. How to use this manual The main body of this manual, the fault table, is designed to be as quick and simple as possible to use when you are confronted with a faulty product and so it is arranged by fault symptom as the symptom is usually all that you will know about the fault. If

9、you are unsure about the meaning of any words or phrases, look in the Glossary. (accessible via Linfo Website - Product Information) Before embarking on any Service work, you should read the Service Procedures section (accessible via Linfo Website - Product Information), as there are certain procedu

10、res that must be followed in order to ensure the problem is resolved quickly and permanently. Table of contents & fault symptoms Look firstly at the table of contents and find the category that you covers the symptom you are seeing, then look down the list of faults in that section until you find th

11、e symptom or symptoms that best describe the problem. Circumstances Then simply follow the table along the table specifies circumstances surrounding the fault symptom e.g. whether the fault is likely to be intermittent or constant, if the fault only occurs within a range of serial numbers etc. Possi

12、ble causes The next column details possible causes this is effectively the most important section, probably the main reason you are looking at this manual at all. There may be several possible causes for the symptom you have it is worth checking out all of these (maybe there is more than one fault).

13、 For some faults, simple checks are detailed that you can use to rule out the problem without replacing any parts, whereas for other faults, the simplest way to rule out the problem is to replace the component(s) listed Cure Quite simply the action that you must take to cure the problem. Downloaded

14、from www.M manuals search engine RadioFans.CN 收音机爱 好者资料库 2nd June 1999 Page3 Copyright 1999 Linn Products Limited. All rights reserved. Contents Installation Important Safety Information Mains connections This appliance must be earthed both for Safety and functional reasons. Lethal Voltages Inside t

15、he amplifier, lethal voltages are present do not touch any part of the circuitry with any part of your body or with metallic or conductive objects. Avoid especially the area around the mains inlet and its connectors Installation Unpack the product & retain the packing for future transportation. As a

16、 Linn retailer, you are responsible for ensuring correct installation of the product. Consult the user manual and read the Placement & Handling information below. Placement Location & Environment Do not locate near electronic products that may transmit RF, such as microcomputers, fax machines, TVs e

17、tc, or connect them to the same mains socket as these devices. Also avoid close contact with the mains or signal leads of such products careful routing of the cable may be required. Although the amplifier can usually be stacked along with other products with no problem, it is better if possible to k

18、eep it apart from other products to prevent its operation being adversely affected by the heat and strong electrical field emitted by some products. This is also advisable due to possibility of the heat and electrical field that, unavoidably, emanate from a product as powerful as the LK240/AV5105 fr

19、om adversely affecting the performance of other adjacent products. Avoid locations that have high humidity or the chance of the unit getting wet. Avoid locations where there is a lot of dust. Handling & general maintenance. No standard maintenance is required, except perhaps re-connecting the plugs

20、periodically to improve contact Always handle the amplifier with great care. Always turn off the unit and the pre-amp to which it is connected before connecting or disconnecting any plugs to/from the sockets at the back of the unit to avoid damaging the speakers etc. If you are carrying out any work

21、 on the unit with its sleeve removed, ALWAYS take anti-static precautions as tiny static discharges from your body, which you may be completely unaware of, can damage electronic circuitry and cause major problems. Anti-static earth mats & wrist straps must be used when handling any of the circuit bo

22、ards or any spare parts. Downloaded from www.M manuals search engine RadioFans.CN 收音机爱 好者资料库 2nd June 1999 Page4 Copyright 1999 Linn Products Limited. All rights reserved. Contents Power-up problems The following are some problems you may encounter when you power up the LK 85 or LK140. Power up prob

23、lems SymptomCircumstancesPossible Cause(s)Cure Wont power up. Power LED dead & no function ConstantFuse blown in unit and/or in mains plug. Replace fuse(s) with correct value & type. Fuse in mains lead should be 5A. Fuse in the mains inlet of the amp should be “Slow Blow” look for a T before the rat

24、ing on the fuse. Correct types are: 100 - 115V - 6.3A 220 - 240V - 3.15A Power LED deadMay be intermittentPower LED faulty Or Fallen out of its place in the facia Or Has a bad connection Check that power led is correctly fitted to its socket in the facia. Check that it is making good electrical cont

25、act (pushed fully into socket on board etc.) If faulty, replace Linn part no: CONN 702. Power LED is redMay be intermittentUnit is in Standby or is in TripSee User Manual See Stand-By Problems section. See Protection Problems section Wont power up - Power LED dead & no function May be intermittent m

26、ay die intermittently or sometimes may not power up Mains lead faultyReplace faulty mains lead. Doesnt power upMay be intermittentWrong voltage for amplifier type mains voltage is too low. (e.g. 240V unit being used with 115V mains supply.) Check voltage rating at rear of unit. If you have the wrong

27、 amplifier type, you will require to replace the mains Transformer with the correct type Linn part nos: LK85 230V - MCAS 030/230 115V - MCAS 030/115 100V - MCAS 030/100 LK140 230V - MCAS 033/230 115V - MCAS 033/115 100V - MCAS 033/100 Downloaded from www.M manuals search engine 2nd June 1999 Page5 C

28、opyright 1999 Linn Products Limited. All rights reserved. Contents Doesnt power up or Powers up (power LED may be lit) but no function. Intermittent - tapping or bumping the unit makes fault come & go Bad connection either inside or outside the unit. Find and eradicate bad connection. It may be some

29、thing as simple as a connector not pushed fully home and may be easily visible. If fault is intermittent, see Introduction to Fault Finding section (paragraph on intermittent faults - accessible via Linfo Website - Product Information). If fault is not intermittent, it may be possible to trace the f

30、ault again see Introduction to Fault Finding Substitution & Isolation Unit dies intermittently At any timeMains voltage dropping too low for unit to function correctly (known as Brown outs as these voltage drops also sometimes cause the lights to dim.) Consult an electrician or your power company. U

31、nit does not power up or powers up & then dies May die intermittently or briefly and then come back on again. May be intermittentMains inlet faultyReplace mains inlet Linn part no: CONN 385 Unit does not power up or powers up & then dies May die intermittently or briefly and then come back on again.

32、 May be intermittentTransformer faultyReplace transformer Linn part nos: LK85 230V - MCAS 030/230 115V - MCAS 030/115 100V - MCAS 030/100 LK140 230V - MCAS 033/230 115V - MCAS 033/115 100V - MCAS 033/100 Fuse blowing SymptomCircumstancesPossible Cause(s)Cure Fuse blowingMay be intermittentWrong type

33、 of fuse fittedReplace fuse(s) with correct value & type. Fuse in mains lead should be 5A. Fuse in the mains inlet of the amp should be “Slow Blow” look for a T before the rating on the fuse. Correct types are: 100 - 115V - 6.3A 220 - 240V - 3.15A Fuse blowingMay be intermittentMains surgesConsult a

34、n electrician or your power company. Downloaded from www.M manuals search engine 2nd June 1999 Page6 Copyright 1999 Linn Products Limited. All rights reserved. Contents Fuse blowingMay be intermittentWrong mains voltage for unit voltage setting - mains voltage is too high, e.g. 115V unit connected t

35、o 230V mains. If the voltage setting is slightly off (e.g. the unit is set to 100V but used with 115V mains), the fuse may blow occasionally. Replace fuse WITH CORRECT TYPE & RATING and replace mains transformer with correct type to correspond with Mains used. Transformer part nos: LK85 230V - MCAS

36、030/230 115V - MCAS 030/115 100V - MCAS 030/100 LK140 230V - MCAS 033/230 115V - MCAS 033/115 100V - MCAS 033/100 Fuse blowingMay be intermittent but usually constant Transformer faulty. To check if it is definitely the transformer, power down the unit, replace fuse, disconnect the transformer outpu

37、t from the Main board and power up. If the transformer IS the cause, the fuse will continue to blow. If the fuse remains intact, the fault is more likely to be on the Main board. Try another transformer of the same type if you have one. Replace transformer Linn part nos: LK85 230V - MCAS 030/230 115

38、V - MCAS 030/115 100V - MCAS 030/100 LK140 230V - MCAS 033/230 115V - MCAS 033/115 100V - MCAS 033/100 Fuse blowingMay be intermittentFaulty mains inletReplace mains inlet Linn part no: CONN 385 Fuse blowingMay be intermittent but usually constant Bridge rectifier diodes D1, D2, D3 or D4 internally

39、short circuit. It is usually very easy to measure which (if any) of these diodes have gone faulty a faulty diode will measure short circuit or very low impedance (a matter of a few ohms only) in both directions. Replace faulty diode Linn part no: MISS 287. Fuse blowingMay be intermittent but usually

40、 constant Fault inside unit, e.g. short circuit or similar. See Introduction to Fault Finding section (accessible via Linfo Website - Product Information) for tips on tracing the fault. Downloaded from www.M manuals search engine 2nd June 1999 Page7 Copyright 1999 Linn Products Limited. All rights r

41、eserved. Contents Protection (Tripping) Problems Important information about Trip please read before fault finding on Trip problem. About LK85/LK140 Trip Contained in the following table are some problems you may encounter with regards to the amplifier going into protection, Protection is also referred to as Trip. The units protection circuitry can be tripped by over-temper