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#6
07-01-2020, 02:31 PM
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Looks like the diode is used as a phase comparator (normally a dual diode is used). Never seen a single diode used there before. The circuit depends on a feedback pulse which would come in via C50 and R60.
If there's no waveforms present at the sync sep and noise cancellor stages, the the signal loss must be somewhere 'upstream' of there. Probably be helpful if you could post a fuller schematic. Last edited by old_coot88; 07-01-2020 at 02:44 PM. 
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