Question about Thorens TD158 Turntable

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Thorens TD 145 does not auto stop

The Thorens TD 145, and some other Thorens models, use an electronic circuit connected to an inductor on the bottom of the tonearm shaft to lift the tonearm and cut power to the drive motor.

This inductor/circuit senses the increased velocity of the stylus when it accelerates toward the center in the wider takeout grooves at the end of an LP.

First, there are several mechanical switch and inductor clearance adjustments to be made. Then there are some more complex potentiometer adjustments that control voltage differentials.

My auto stop does not work. What's the best place to start?

I'm pretty electronically capable, but need guidance when it comes to knowing exactly what parts to check, and what VOM settings to use as I check them.

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  • inspired1 Mar 05, 2009

    I took my Thorens TD 145 turntable to a local shop with a reputation for being able to fix anything and the 62 year old owner marvelled at the complexity of the auto shutoff mechanism. He told me he could fix anything with enough time and money. If I was lucky it could be a $200 repair bill. If not he said it could be $2,000 (4 full days worth of his $60 per hour hours). That prompted me to dig deep into the Thorens service manual I downloaded online and study up to attempt to troubleshoot the problem myself.

    I SUCCEEDED. My automatic stop now works like a charm!

    There is a cream colored round ceramic disc attached to the base of the tonearm shaft inside of the turntable plinth that actuates the circuit that automatically lifts the tonearm and cuts power to the motor when the stylus reaches the takeout grooves at the end of an LP.

    The hardboard base must be removed to access the inside of the plinth it by removing the 4 screws that hold on the 4 rubber feet.

    There is a rectangular cover over the base of the tonearm shaft that must be removed by unscrewing its attachment single screw. Then there are 2 plastic "tangs" down into the metal that must carefully be rocked out to avoiding breaking the cover as you remove it This will expose left and right channel wire attachment points, the ceramic disc, and the inductor (has 2 red wires and a capacitor).

    Two things must be in proper adjustment.

    The distance between the white nylon nductor assembly and the ceramic disc must be set to the tiny clearance of .4 mm (4/10ths of 1 millimeter) from the ceramic disc.

    Last, the disc contains a small piece of metal that interacts with the inductor. A tiny set screw must be loosened in order to be able to rotate the disc in relation to the shaft and inductor. It is factorysealed in place with a small dab of blue paint. If you loosen this set screw too much the nut down inside will come loose and you will have to pull the ceramic disc off of the shaft to carefullu line things up inderneath. You want to avoid this by loosening the screw only a tiny bit.

    The disc position on the tonearm pivot shaft is is an extremely sensitive factory adjustment that should never be tampered with unless you have strong reason to believe the disc has shifted in relation to the shaft and is the root of the problem.

    In my case, I believe that .4mm clearance widened to more than 4mm due to rough shipment when I purchased my TD-145 from eBay, and my resetting that proper width cured my problem.

    There are also 3 switches in the circuit (one red one below the speed selector lever, an a red switch and tiny 2-pronged metal "reed" switch below the tonearm lifting lever) that must have proper clearances.

    Last, while unlikely, the problem the problem may not be mechanical. There are of diodes, capacitors, resistors, transistors and potentiometers on the circuit board that controls the auto stop feature. A component could be bad, or one of the 2 potentiometers that adjust voltage within the circuit could be out of adjustment.


  • inspired1 Mar 22, 2009

    You can find both both owner's and service manuals for the TD-145 in Adobe Acrobat pdf format for download at http://www.vinylengine.com. You'll need to create a free membership before you can download.

  • inspired1 Mar 22, 2009

    You can download Adobe Acrobat pdf format copies of both the owner's manual and service manual for the Thorens TD-145 at http://www.vinylengine.com. You'll need to create a free username and password account before you can download.

  • inspired1 Mar 22, 2009

    You can download and Adobe Acrobat format file of both the owner's and service manuals for the Thorens TD-145 at http://www.vinylengine.com. You'll have to create a simple username / password based account before you are able to download.

  • inspired1 Mar 22, 2009

    You can download and Adobe Acrobat format file of both the owner's and service manuals for the Thorens TD-145 at http://www.vinylengine.com. You'll have to create a simple username / password based account before you are able to download.

  • Leo J. Nesuahecner
    Leo J. Nesuahecner Oct 05, 2013

    The bottom of the tone arm shaft has a white plastic cup with a single screw in it. You need to remove a large square plastic cover also with a single screw to access the cup. This cup has a magnet in it. As the arm rotates to the end of the record this magnet trips a switch that pops the solenoid under the start stop lever. By loosening the screw on the white cup you can rotate the cup so the magnet hits it's switch sooner or later . It is touchy so prepare to to spend time fiddling with it. There is a small pointer on the cup you can use to grab with your fingernail to rotate the cup counter or clockwise. Hardest part is standing the table on end and operating all functions with the left hand and rotating the cup to various positions. Remember to gently tighten the screw after each adjustment or it will move when the tone arm is moved.

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Leo J. Nesuahecner The bottom of the tone arm shaft has a white plastic cup with a single screw in it. You need to remove a large square plastic cover also with a single screw to access the cup. This cup has a magnet in it. As the arm rotates to the end of the record this magnet trips a switch that pops the solenoid under the start stop lever. By loosening the screw on the white cup you can rotate the cup so the magnet hits it's switch sooner or later . It is touchy so prepare to to spend time fiddling with it. There is a small pointer on the cup you can use to grab with your fingernail to rotate the cup counter or clockwise. Hardest part is standing the table on end and operating all functions with the left hand and rotating the cup to various positions. Remember to gently tighten the screw after each adjustment or it will move when the tone arm is moved.

Posted on Oct 05, 2013

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Where did you find the Thorens manual?
Is it the mkII one or simply for the TD-145?
Thank you.

Posted on Mar 22, 2009

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This is the Thorens Service Warranty link:
http://www.thorens.com/support/service-warranty.html

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http://www.thorens.com/support/distributors.html

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Address: WS Distributing, LLC
3427 Kraft SE
Grand Rapids, MI 49512
Phone: +1 616-885-9809
Fax: +1 616-885-9818
Email: tmyerswsdistributingcom
Website: www.wsdistributing.com

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Downloads are NOT free.

http://tech.thorens.com/en/thorens.index.php?id=en_650_0_1_&name_search=td280&category_search=1&prodd_search=0&x=4&y=7

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