Hi, I've got this nice DD turntable with his original Ortofon cartridge and needle.
Everything in good condition, except that now the electronic lost the control of the platter speed, that goes full throttle (not 33, nor 45 rpm). There are service manuals at 'vinyl engine' and 'elektrotanya', but unfortunately none includes the electronic control board schematic. So, I'm asking if someone can provide this, or some advice, if have had and solved a similar problem, with this specific turntable model.
Cheers
J.
Everything in good condition, except that now the electronic lost the control of the platter speed, that goes full throttle (not 33, nor 45 rpm). There are service manuals at 'vinyl engine' and 'elektrotanya', but unfortunately none includes the electronic control board schematic. So, I'm asking if someone can provide this, or some advice, if have had and solved a similar problem, with this specific turntable model.
Cheers
J.
Hi, Even though you looked at the VE site.....did you ask for a schematic on the Dual Forum? I had to do that when the schematic for my 701 didn't match any of the common versions. A member had another version that matched mine.
Regardless the first thing I would try is to clean the controls. They get cruddy over time and can cause your problem. My 701 behaved somewhat like that and cleaning did not help. One of the on board capacitors had failed....I replaced all the electrolytics and the problem was fixed.
Regardless the first thing I would try is to clean the controls. They get cruddy over time and can cause your problem. My 701 behaved somewhat like that and cleaning did not help. One of the on board capacitors had failed....I replaced all the electrolytics and the problem was fixed.
Thanks Bruce. Good idea. I 'll ask on the Dual forum, and in the meantime, I'll also perform the capacitors check. Let's hope it will not be some ancient unobtanium IC...
Happy ending
Dual CS 714 Q speed problem solved, guilty was the little detachable module on the right, the bigger chip and a 47uF electrolytic cap where causing complete lost of platter velocity control. Replaced both and everything returned to normal. But my unit is probably an older version than the picture posted below, none of the chip are on sockets, but soldered directly to the printed circuit..
Dual CS 714 Q speed problem solved, guilty was the little detachable module on the right, the bigger chip and a 47uF electrolytic cap where causing complete lost of platter velocity control. Replaced both and everything returned to normal. But my unit is probably an older version than the picture posted below, none of the chip are on sockets, but soldered directly to the printed circuit..
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