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Technics st-gt650 fm tuning issue
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<blockquote data-quote="Llew" data-source="post: 1069292" data-attributes="member: 175007"><p>[USER=243342]@Captain Jack[/USER]</p><p></p><p>I have a Technics ST-G70L tuner, which, checking the schematic Terry points to, appears to have similar FM/AM circuitry (without RDS).</p><p></p><p>I had a problem that seemed to be something like yours, with stereo going down completely some time after the stereo indicator started flickering on and off.</p><p>Before checking voltages around the IF Amp/Detector IC102, I tweaked the offset voltage adjustment coil off the IC T101 a little, which restored the stereo O/P. I didn't actually check voltages afterwards - if it happens again I will do so.</p><p></p><p>The problem occurred after several years' use of the tuner, which leads me to think it may have been due to premature ageing of some components, as the tuner sat above an amp.</p><p></p><p>The tuner is very well designed, with ample space inside betweem the (linear) PS and main circuit board. I suppose I was unlucky with positioning the tuner immediately above the amp. OK now anyway.</p></blockquote><p></p>
[QUOTE="Llew, post: 1069292, member: 175007"] [USER=243342]@Captain Jack[/USER] I have a Technics ST-G70L tuner, which, checking the schematic Terry points to, appears to have similar FM/AM circuitry (without RDS). I had a problem that seemed to be something like yours, with stereo going down completely some time after the stereo indicator started flickering on and off. Before checking voltages around the IF Amp/Detector IC102, I tweaked the offset voltage adjustment coil off the IC T101 a little, which restored the stereo O/P. I didn't actually check voltages afterwards - if it happens again I will do so. The problem occurred after several years' use of the tuner, which leads me to think it may have been due to premature ageing of some components, as the tuner sat above an amp. The tuner is very well designed, with ample space inside betweem the (linear) PS and main circuit board. I suppose I was unlucky with positioning the tuner immediately above the amp. OK now anyway. [/QUOTE]
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Technics st-gt650 fm tuning issue
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