Linn-LP12-tt-sm 电路图 维修手册.pdf

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1、LINN LP12 TURNTABLE SET UP MANUAL RadioFans.CN 收音机爱 好者资料库 Page 2 Copyright 1991-1998 by Linn Products Limited. All Rights Reserved. Revised Jan 1998 INDEX IN THE BEGINNING . This is where it all began back in 1973 - the Sondek LP12, which revolutionised peoples perception of what pro- duces good hi-

2、fi. At Linn we have demonstrated that turntables are the most important component in a record playing hi-fi system. Twenty five years after its introduc- tion, the LP12 is still the reference turntable. Since 1973, Linn has invested a great deal of time and effort upgrading the LP12; improvements wh

3、ich have had far reaching effects on the whole system. Today, the LP12 sounds significantly better than at any time in its history, and has an ever expanding customer base. Looking after yesterdays customer has always been a priority at Linn, ensuring that almost all the upgrades are retrofittable,

4、thus making it possible to upgrade any LP12 to current specification and performance. This section is designed to assist you to carry out any requested upgrades to the LP12, to help you identify and correct minor irregularities, to familiarise you with recom- mended tools and provide useful informat

5、ion on LP12 specifications. We hope this section will help you provide better service to all your existing and future LP12 customers. RadioFans.CN 收音机爱 好者资料库 Page 3 Copyright 1991-1998 by Linn Products Limited. All Rights Reserved. Revised Jan 1998 INDEX INDEX Contents.Page LP12 Introduction . 2 LP1

6、2 Set-up . 4 Required Tools . 5 Set-up Jig . 6 Preparation . 7 Assembly . 10 Suspension Adjustments . 14 Arm cable fitting. 17 Motor adjustment . 21 Final Installation . 23 Tips. 24 Common Turntable Set-up Faults . 25 LP12 Fault Finding. 26 Lingo Fault Finding . 32 LP12 Guidelines for Upgrade and Re

7、pair Lingo. 33 Suspension Grommets . 36 Motor Thrust Bearing. 37 Bearing Housing “CIRKUS” . 38 Armboard . 41 Suspension Springs. 41 Sub-chassis (glued). 42 Plinth. 43 Valhalla Power Supply. 44 Nirvana Kit . 45 Valhalla Repair Kit. 46 Valhalla Update Kit . 47 Motor Adjustments . 48 Linn Speedchecker.

8、 50 Kinky Arm Alignment Tool . 51 T-Bar Bolt Straightener. 52 45-rpm Adaptor. 53 LP12 History and Upgrade Path . 54 LP12 Specifications. 57 Separate Documents: LP12 Circuitry Fitting Instructions for Basik/Valhalla/Lingo including Wiring Diagram for Early LP12 . LP12_tech_circuitry.pdf LP12 Trampoli

9、n Fitting Instructions . LP12_tech_baseboard.pdf LP12 Motor Flush Instructions . LP12_tech-motorflush.pdf RadioFans.CN 收音机爱 好者资料库 Page 4 Copyright 1991-1998 by Linn Products Limited. All Rights Reserved. Revised Jan 1998 INDEX LP12 SET-UP INTRODUCTION Important - read this before you begin It is ext

10、remely important that you read this entire section before attempting to set up a Linn Sondek LP12 Turntable. Failure to do so may well result in substandard performance, and could result in perma- nent damage to the turntable. We realise that the policy of most hi-fi dealers is, “If all else fails,

11、read the instructions”. The set up procedure used on the Linn Sondek, while not terribly difficult, is significantly different from that used on other turntables. It is virtually impossible to set the table up correctly without following the steps in this section. These instructions refer specifical

12、ly to the set up of the Linn Sondek LP12 fitted with a Linn Tonearm and cartridge. Tightening Procedure Since we are dealing with a transducer that has to recover information considerably smaller than a millionth of an inch from a phonograph record, it is important that all fasteners (screws, nuts,

13、and bolts) in the turntable be very tight. Whenever the instructions call for you to tighten a fastener, we do mean tight - probably tighter than you would have imagined. However, there is no advantage to tightening past the point where materials will deform, or where you damage the materials or des

14、troy their structure. A good rule of thumb is simply to bring the nut or screw up to where it seems tight and then turn it about 1/8 turn more (in the case of armboard screws, which are put into wood, 1/16 turn will do). Estimated Time for Completion of task 60 minutes Page 5 Copyright 1991-1998 by

15、Linn Products Limited. All Rights Reserved. Revised Jan 1998 INDEX Tools Needed For Set-Up 5.5mm or 7/32 Hollow Shaft Nut Driver 8mm or 5/16 Hollow Shaft Nut Driver No. 1 Pozidrive Screwdriver No. 2 Pozidrive Screwdriver All cross slot screws on the LP12 are Pozidrive. While a Phillips screwdriver w

16、ill work, the correct Pozidrive screw- driver is preferred. Medium Size (about 5 mm wide) Flat Blade Screwdriver Medium Size Needle Nose Pliers 12mm or Adjustable Wrench 5mm or 3/16 Wrench 1.33mm Allen Key 2mm Allen Key 3mm Allen Key 4mm Allen Key Required allen keys, except for the 3mm, are supplie

17、d with Linn tonearms. Turntable Set-Up Jig or Substitute It is desirable to raise the turntable to about eye level so that you can reach and see the underside of the turntable. The set-up jig on a standard-height work bench is best. The surface that the set-up jig or turntable rests upon must be abs

18、olutely steady and level for proper suspen- sion adjustment. If the surface is unsteady or subject to rocking motion, the energy put into the suspension during the adjustment process can induce movement in the support surface as well as the suspension. Proper adjustment of the turntable suspension w

19、ill be difficult, if not impossible under these conditions. Page 6 Copyright 1991-1998 by Linn Products Limited. All Rights Reserved. Revised Jan 1998 INDEX LP12 SET-UP JIG We recommend that you always use a set-up jig when setting up an LP12. This will facilitate ease of adjustment, prevent damage

20、to your turntable and ensure proper suspension adjustment. 1.Before using the jig make sure that the mounting plates have been covered with a protective strip. Fit protection to underside of clamp and place the jig on a stable surface. 2.Fit plinth carefully to set-up jig and lock in place. 3.Adjust

21、 jig feet until plinth is level. Check with a spirit level, both front to back and side to side. ? level ? level Page 7 Copyright 1991-1998 by Linn Products Limited. All Rights Reserved. Revised Jan 1998 INDEX PREPARATION The next steps cover unpacking the turntable and check- ing to see that none o

22、f the fasteners (screws, nuts or bolts) have become loose due to vibration in transit. Caution Make sure that the turntable is unplugged from the A/C outlet before removing the bottom cover. High Voltages (400 Volts!) are present on the Valhalla circuit board. Failure to observe this precaution can

23、result in serious electrical shock. Please note that, on turntables equipped with the Valhalla circuit board, the board is live at all times. The Valhalla switch does not turn the A/C power on and off; it simply sends a control pulse to the board which results in the motor being turned on or off. 1.

24、 Unpack the Turntable Packed below the dustcover you will find: An armboard Two dustcover hinges Two baseboard screws Three armboard screws One inner platter/spindle assembly Two phials of main bearing oil Underneath the turntable you will find: The outer platter, felt mat, and belt 2. Place Turntab

25、le in Set-up Jig After placing the turntable in the set-up jig, lock the turntable into place. Use a spirit level to ensure that the turntable plinth (base) is level. This is done by adjusting the feet of the set-up jig. Please note that if you are using a Linn set-up jig, you may lay the jig on its

26、 back at various times during set-up to provide easier access to the underside of the turntable (steps 3 to 6 for example). However, when this is done you should first remove the inner platter and cap the main bearing well with the red plastic cover provided to avoid spillage from the bearing housin

27、g if it has been charged with oil. Page 8 Copyright 1991-1998 by Linn Products Limited. All Rights Reserved. Revised Jan 1998 INDEX 3. Remove Baseboard Before proceeding with this step, stop and check to make sure the turntable is unplugged! To remove the base- board, unscrew and remove the four fee

28、t on the bottom of the turntable. If you are working on a previously set-up table, you will also have to remove the two baseboard screws that are located in the centre of both the front and rear edges of the baseboard. NOTE: If the turntable is to be repacked in its original carton, the two baseboar

29、d screws must be removed. If left in, they will scratch the rim of the platter which is packed directly under the turntable. 4. Remove ground and P-Clip Nuts Use the 8mm nut driver to remove the nut holding the turntable earth jumper wire to the front chassis bolt, and the nuts holding the nylon P-c

30、lip, washer, and green A/C ground wire (if fitted) to the rear chassis bolt. (See Turntable Exploded View). 5. Tighten Wiring Strap Nuts Check to see that the nuts holding the wiring strap, on which the circuit board is mounted, are tight. These nuts are located directly under the ones just removed.

31、 The chassis bolts pass through the wood mounting blocks of the plinth. These wooden blocks may expand and contract due to temperature and humidity extremes during transit and this can result in the nuts working loose. Observe the top surface of the stainless steel top plate as you tighten these nut

32、s. Do not overtighten these nuts such that the stainless steel top plate becomes de- pressed or deformed beneath the heads of the chassis bolts. 6. Tighten Sub-chassis Ground Screw Tighten the allen head screw which attaches the chassis earth jumper wire to the right rear edge of the sub-chassis. Wi

33、th older turntables that do not have this screw, proceed to the next step or if welded type,drill the side of sub- chassis and relocate earth wire. Page 9 Copyright 1991-1998 by Linn Products Limited. All Rights Reserved. Revised Jan 1998 INDEX 7. Tighten Top Plate Screws By looking down at the stai

34、nless steel top plate from above, locate the two small pozidrive screws that help to attach the top plate to the plinth. They can be found next to the chassis bolts located at the centre front and centre rear of the top plate. Ensure that these two screws are tight. 8. Check the Position of the Moto

35、r Check the position of the motor mounting bolts in the elongated slots in the top plate. These are the two bolts on the extreme right and left of the motor. On current turntables, (50 Hz pulley, 21mm diameter) the motor mounting bolts should be in the middle of the adjustment range. While this can

36、be accomplished by carefully aligning each of the two motor mounting screws in the middle of the slot provided, it is easier and far more accurate to simply have one motor mounting bolt at the extreme outside of its slot, and the other motor mounting bolt at the extreme inside of its slot. In countr

37、ies with 60 Hz mains supplies, older turntables may have a smaller (17 mm) diamter pulley. On these LP12s the motor should be in the outermost position. This is accomplished by having both motor mount bolts at the extreme outside of their slots. Please note: All new turntables are factory fitted wit

38、h the larger, 50Hz pulley, and thus should have one motor mounting bolt at the extreme outside of its slot and the other motor mounting bolt at the extreme inside of its slot. Both Lingo and Valhalla power Suplies use the 50Hz motor/pulley. Motors with 60 Hz pulleys as supplied in the appro- priate

39、BASIK power supply kit and are not compat- ible with the Lingo or Valhalla power supply. Original Valhallas supplied to countries with 60 Hz mains were supplied 60 Hz Valhalla boards. Page 10 Copyright 1991-1998 by Linn Products Limited. All Rights Reserved. Revised Jan 1998 INDEX 9. Check Motor Mou

40、nting Nuts After you have checked the position of the motor mounting bolts, check that the nuts on the motor mounting bolts are tight, using the 5.5 mm nut driver. Do not over-tighten these nuts or you will simply crush the motor mounting domes! 10. Check Bearing Housing Bolts Check that the bolts w

41、hich mount the bearing housing and oil well to the sub-chassis are tight. These are accessible from the top, through the hole in the centre of the stainless steel top plate, by shifting the sub-chassis from one side to another. Current Cirkus LP12 turntables use 4 mm socket head (Allen key) bolts. O

42、lder units may use 2 mm, 2.35 mm 2.5mm or 3mm socket head bolts, Phillips screws, or slotted screws. POWER SUPPLIES Since 1991 (serial number 87600) the LP12 has been supplied as a mechanical assembly only, without power supply factory fitted. Three different power supplyoptions are available: Lingo

43、, Valhalla and Basik. Valhalla and Basik. If you are setting up a new turntable see separate instructions for fitting the power supply. ASSEMBLY Some instructions in this section, concerning certain tools and fasteners, are specific to Linn tonearms. Procedures may vary slightly if other tonearms ar

44、e used. 11. Mount the Tonearm Base on the Armboard In the case of the Linn arms, the arm base is fastened from the bottom of the arm board with three 4mm socket head bolts with lock washers.Read section on Kinky arm alignment tool before proceeding. To Locate Properly With arms using other mountings

45、, ensure that the mount- ing screws, bolts, or nuts are properly tightened observ- ing the tightening procedure. With arms using a single large mounting nut, reaching the proper tightness does require the use of a spanner, not just your fingers! Page 11 Copyright 1991-1998 by Linn Products Limited. All Rights Reserved. Revised Jan 1998 INDEX 12. Mount the A