Reproduction without prior permission or for financial gain is strictly prohibited. This website is not affiliated with or sponsored by Dual. The best I can figure is that I'm missing a spring, but if anyone has detailed instructions as to how to troubleshoot, I would appreciate it. I have the manual, it is unhelpful in this regard.
Training Manuals generally contain more in-depth servicing information and circuit explanations. Not all appliances and electronics have Training Manuals. Supplements usually address changes in circuitry. You can see all the gunk gathered near the lifting mechanism. This is a best example of why you should never oil your tonearm. All that dust was attracted by damping oil sipping through the lifting leg and it was stuck. I could really tell that tonearm vertical and horizontal movements were also somehow impaired by all this filth.
Nothing out of ordinary could be seen at first glance. No broken, hanging or otherwise misplaced parts. And most importantly no marks of previous repairs! And I will not name them. Just a couple remarks. Motor armature had some rust on it and all the lube on contact surfaces had dried and hardened.
Couple passes with sand paper and some oil should do the trick. All that hardened lube, on other hand, presents a real problem. As you remember this table was not functioning at all.
This is usually a good thing. It means that there is a chance for an easy repair. Motor is not spinning because of electrical discontinuity, or the switch is not actuated by the start-stop mechanism. First thing to check was actual motor. I quickly soldered spare mains plug directly to motor terminals 3 and 4 and plugged it in the socket.
That was a good news. Next suspect was a switch. Upon further inspection I noticed a lot of oxidation everywhere around switch box. Anyhow, after switch cleaning, table started for the very first time! Only to stop in a middle of tonearm lift cycle couple seconds later.
And here goes WD40 to the rescue. Good spray, and 10 minutes later, it was operating as it should. I had first full start-stop cycle, but then things went south. There was this sporadic behavior when table suddenly stopped or refused to start again. It was obvious that something else was a miss. I had my eye on these connectors for motor supply. They were almost black from oxidation and their whole assembly looked quite suspicious. They are kept in place only by a small surface of terminals outer sleeve.
I got bored cleaning them and getting intermittent interruptions — so soldering it is. After that, it was starting and stopping like a clock. Further inspection revealed broken tonearm wires on junction board. Also muting switch contacts were oxidized. Again, an easy fix. Those old DIN wires goes to a trash bin.
If I could give one advice before any disassembly, I would say take as much photos as you can. Believe me, it makes your live so much easier. This table is not very complicated, so one with even minimal technical skills and experience will be able to put it back again. But will it work? Here is were service manual comes handy. For a face-plate, platter and all visible parts, which has any paint or lettering on them, I like to use simple industrial soap.
Make sure it has no additives, such as hand cream or abrasive particles and watch out for that silk-screen lettering! For all inside moving parts, that has some old grease on them, I use engine cleaner. Just put those parts in separate plastic container, spray it and leave it for 10 minutes. A slightly damp cleaning cloth or soft, dust-free cloth works best to remove fingerprints.
Dust in hard-to-reach places is best removed with compressed air. Is the manual of the Dual available in English? Unfortunately, we do not have the manual for the Dual available in English.
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