Question about Audio Players & Recorders
I have a Thorens TD160 turntable. I have connected it both to the phono input of my amplifier, and to a separate phono-preamplifier. The right channel (of the turntable) will occasionally become very silent, almost mute. This can almost always be solved by unplugging then replugging the right channel cable. Sometimes playing with the tonearm also helps, or it can introduce the problem. I have measured some resistances. At the time of the problem, I could not get a measurable reading for the right channel, but the left channel was at about 500 ohms. The resistances between the cartridge and the output were about 2-5 ohms for all three cables (left active, left ground, right ground) but for the right active cable, it was over 30 ohms. Am I right to suspect a faulty wire, and how can I fix this?
Posted by Anonymous on
Disconnect the wires from the cartridge. Then with the amp on touch each of the four wires with your finger. You should hear a loud buzz on two of the wires one on each channel. If you don't then the connections could be faulty. If you can hear the buzz, get someone else to move the wires connecting the deck to the unit. If you loose the buzz then something is poorly connected.
If all is good and the buzz is present no matter what you do, then either you have a bad connection to the cartridge or the cartridge is faulty.
Posted on Mar 20, 2017
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Posted on Jan 02, 2017
on page 8 of the above service manual for your model it shows 4 electrical switches that tell the computer what 'state' the mechanism is in at any given time. Either one or more of the switches are intermittant or the mechanism has dried up grease that is slowing down the operation and basically gumming up the works. the old grease would have to be removed and replaced when it is causing binding. The switch just to the right of where is says "microswitch ksf-023" is an 'open air' type and so would be the most likely suspect. it simply needs to be cleaned with a super fine file designed only for cleaning switch contacts. THIS SERVICE SHOULD ONLY BE PERFORMED BY QUALIFIED PERSONNEL ONLY!!!!!
Posted on Feb 11, 2009
I can help with this issue. To keep the platter spinning in manual mode, you have to cue the tonearm up and move it so it is over the record. Then flip the lever to manual. It should stay on in this position. This is a feature and not a bug.
Regarding the audio / humming problem. The Duals had what was known as a muting circuit that engages as the turntable is cycling between rest and play. The fact that you are getting no sound may be an indication that the muting circuit is still engaged. Here are a few things you can try:
1. If the unit was recently shipped, you may need to reset the mechanical function of the turntable. You can do this by locking down the tonearm to the tonearm rest, turning on the power and then flipping the lever for a full automatic cycle. The tonearm will stay fixed to the rest, but the remainder of the mechanical system underneath will be reset to proper positioning (this is detailed in the Dual manual). Of course, this assumes that everthing was OK prior to shipping.
2. Make sure your cartridge is properly mounted with a good stylus, check your tonearm wires (both in the headshell and underneath the turntable and finally, see if you can get underneath the turntable while you run an automatic cycle to see what is going on.
Lastly, if you can't get it going, Check out Bill at www.fixmydual.com He worked on my 1019 and knows them inside and out.
Posted on Apr 26, 2009
SOURCE: Dead left channel
I have had the same problem on my 1210 MKII. I have taken it apart a number of times to replace the original lights with LED's, and naturally thought I messed something up in the reassembly. I actually found that the problem was in the connection between the tone-arm and the pick-up "housing".(Pardon my bad english) There is a little rubber band in between, and sometimes you have to unscrew the "housing" flip the rubber band, and screw it back on pretty hard. Also try cleaning the four contact pins before screwing it back on. I have heard of quite a few having this problem. A pretty obvious thing to do, but I had not thought of it, and it would have saved my from taking the entire machine apart several times.
Posted on Jun 18, 2009
Get an external pre-amp. They range in price from 25-100 and more, depending on the capabilities. All over Ebay, and electronics sites. That will fix your problem. Hope this helps
Posted on Jul 06, 2009
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