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DIY For Audio
Power amp diagnostics / earthing advice: help needed
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<blockquote data-quote="LAV" data-source="post: 73511" data-attributes="member: 1123"><p>Thx Ludo! You have given me more clues. I have not tried measuring from the Marantz chassis to mains earth. That would be most interesting, will try and then let you know the outcome.</p><p></p><p>I also could not find a 1080 schematic, so I'm guessing between the 991 and 1090's diagrams I should be close. AFAIK the 1080 is just a glorified 991.</p><p></p><p>No voltage difference with signal leads connected, but "hum there be, young Skywalker!", unless the mains earth on the 1080 is left open. (Interestingly the 1070's IEC / kettle socket does not have an earth pin)</p><p></p><p>I'll check / wiggle / manipulate the multipins & ribbons...but that 1080 seems to have been pampered and everything looks rock solid...and sounds great too (sans mains earth <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick out tongue :p" loading="lazy" data-shortname=":p" />)</p></blockquote><p></p>
[QUOTE="LAV, post: 73511, member: 1123"] Thx Ludo! You have given me more clues. I have not tried measuring from the Marantz chassis to mains earth. That would be most interesting, will try and then let you know the outcome. I also could not find a 1080 schematic, so I'm guessing between the 991 and 1090's diagrams I should be close. AFAIK the 1080 is just a glorified 991. No voltage difference with signal leads connected, but "hum there be, young Skywalker!", unless the mains earth on the 1080 is left open. (Interestingly the 1070's IEC / kettle socket does not have an earth pin) I'll check / wiggle / manipulate the multipins & ribbons...but that 1080 seems to have been pampered and everything looks rock solid...and sounds great too (sans mains earth :P) [/QUOTE]
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DIY & Tutorials
DIY For Audio
Power amp diagnostics / earthing advice: help needed
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