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DIY For Audio
NAD 514 Focus Coil transistor running HOT!
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<blockquote data-quote="Pieter78" data-source="post: 1144102" data-attributes="member: 24582"><p>Check C125 and C124. They are supposed to draw overcurrent to ground. You can also check Q104-Q107. One of them might pass more than necessary. If you have a test bench with power supplies (plural), you can take those 4 out one by one and apply the voltages and measure to see if the voltages listed is the same.</p><p></p><p>Also, double check any diode in the same circuit. Any poorly regulated supply voltage can give overcurrent issues. So anything on the -15V side of the Opto Couplers.</p><p></p><p>Also, if the loading mechanism is misaligned, it can also cause the same issue of the focal lens having a hard time reading the cd. I remember there being a tilt trick to see if that was the case. You tilt the player, in a fixed position, left, right, front, back. You can have it rest on a stack of books or something. It should be kept at a rather steep angle in each position. If you get a perfect read without skips in one of the positions then that is the problem.</p></blockquote><p></p>
[QUOTE="Pieter78, post: 1144102, member: 24582"] Check C125 and C124. They are supposed to draw overcurrent to ground. You can also check Q104-Q107. One of them might pass more than necessary. If you have a test bench with power supplies (plural), you can take those 4 out one by one and apply the voltages and measure to see if the voltages listed is the same. Also, double check any diode in the same circuit. Any poorly regulated supply voltage can give overcurrent issues. So anything on the -15V side of the Opto Couplers. Also, if the loading mechanism is misaligned, it can also cause the same issue of the focal lens having a hard time reading the cd. I remember there being a tilt trick to see if that was the case. You tilt the player, in a fixed position, left, right, front, back. You can have it rest on a stack of books or something. It should be kept at a rather steep angle in each position. If you get a perfect read without skips in one of the positions then that is the problem. [/QUOTE]
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DIY & Tutorials
DIY For Audio
NAD 514 Focus Coil transistor running HOT!
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