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DIY For Audio
NAD 514 Focus Coil transistor running HOT!
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<blockquote data-quote="Bobof67" data-source="post: 1144093" data-attributes="member: 26407"><p>it can definitely be a lens to cd issue. Distance of CD to top of lens. some manuals show what the distance should be. Indeed the pick up unit could be battling to focus driving the lens up or down excessively. The spindle plate that grabs the CD sometimes can "inch" its way down the spindle shaft over time as the magnetic holder slaps down to grip the CD every time a CD is inserted. I attach an example only. Also if you can, look at the eye pattern. It will tell you a lot about the quality of the raw data stream (RF). It will tell you if the focus is out.</p></blockquote><p></p>
[QUOTE="Bobof67, post: 1144093, member: 26407"] it can definitely be a lens to cd issue. Distance of CD to top of lens. some manuals show what the distance should be. Indeed the pick up unit could be battling to focus driving the lens up or down excessively. The spindle plate that grabs the CD sometimes can "inch" its way down the spindle shaft over time as the magnetic holder slaps down to grip the CD every time a CD is inserted. I attach an example only. Also if you can, look at the eye pattern. It will tell you a lot about the quality of the raw data stream (RF). It will tell you if the focus is out. [/QUOTE]
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DIY & Tutorials
DIY For Audio
NAD 514 Focus Coil transistor running HOT!
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