Linn LK 1 Service Manual

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20th August 1999 LK1 Service Manual Page2 Copyright © 1999 Linn Products Limited. All rights reserved. ContentsIntroduction About this manualThis manual is designed to help you as a Linn Retailer or Distributor to repair as many LK1 faults at your repair centre as is practical and so provide the best possible service for your customer should a problem arise. If you have any suggestions or comments regarding this manual, please contact Paul ONeill at Linn Products Ltd: By E-mailPAULO@LINN.CO.UK By Phone++44 (0) 141 303 5005 By Fax++44 (0) 141 644 4262 Marked for attention of Paul ONeill Retailer & Distributor ObligationsLinn Specialist Retailers or Distributors are obliged to carry out the repairs in this manual under the terms of the contract & warranty 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 passed to the customer. Spare Parts Availability and LK1 repairPlease note that the LK1 has been obsolete for some considerable time now and as such, we cannot guarantee the supply of spare parts -“ many are simply no longer available. Some part numbers are listed throughout this manual, but these are provided for information only and this does not imply that these parts will be available should you request them. Linn guarantee that we will service a product until 5 years after the final build. We take this obligation very seriously and also go much further. Beyond this date, we will repair any Linn product that we possibly can, where it is within our power to do so. However, due to the difficulty with the availability of spare parts, as explained above, it is occasionally not possible to repair a product or supply parts for repair, as the necessary parts are not available and can no longer be sourced. How to use this manualThe 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 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 procedures 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 covers the symptom you are seeing, then look down the list of faults in that section until you find the 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.

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20th August 1999 LK1 Service Manual Page3 Copyright © 1999 Linn Products Limited. All rights reserved. ContentsPossible 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 (and bear in mind that there may be more than one fault). 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. Installation Important Safety InformationMains connections This appliance must be earthed -“ both for Safety and functional reasons. Lethal Voltages Inside the LK1, lethal voltages are present, although normally these are inaccessible inside the transformer casing and at the mains switch (which is insulated with heatshrink sleeving.) If the mains switch is properly insulated, none of the wires to/from it are damaged and the transformer casing is closed, the LK1 is quite safe to work on while powered up as only low voltages are found on the circuit boards (maximum 38Vac and 22V dc) Installation InstructionsImportant -“ the LK1 Inverts the phase of the signal to the power amp, therefore to achieve absolute phase, connect the positive output of the power amp to the negative (black) loudspeaker terminal and the negative output to the positive (red) loudspeaker terminal. If, however, you use a speaker switching box or a headphone adaptor box however, these must be wired IN PHASE or damage to the power amp, headphones etc can result. PlacementLocation & Environment Do not locate near electronic products that may transmit RF, such as microcomputers, fax machines, TVs etc, 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. Avoid locations where direct sunlight can shine on the display as sunlight (even diffused sunlight) is a strong source of infra-red light & this causes problems with the units remote control circuitry. Avoid certain types of artificial lighting, such as low energy bulbs, fluorescent light etc, as these emit strong infra-red patterns that can lock up the LK1 control functions. Although the LK1 can usually be stacked along with other products with no problem, it is better if possible to keep it apart from other products to prevent its operation being adversely affected by the heat and strong electrical field emitted by some products. Avoid locations that have high humidity or the chance of the unit getting wet. Avoid locations where there is a lot of dust.