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#2
12-16-2010, 12:36 AM
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Im not familiar with that specific set, but I have run accross several bad video detector diodes.
You can NOT use a 1n4004 and it will not test like a 4004. A 4004, using diode test on a multi meter will read about .500-.600mv, the diode thats in there is Germanium and will read .200-.300mv one direction and open the other direction. You may be able to use a modern silicon detector diode, the 1n4004 is not even close to high enough frequency to work as a detector. When they fail they cause a whole bunch of weird problems depending on if they get leaky, short or open. Everything form buzzing and sync issues to poor color performance and ghosting. I have been using 1N34 or 1N60 as a replacement for these. They are a germanium diode and work just fine. I just looked on ebay and you can buy these numbers for like 10 for $1 Last edited by ctc17; 12-16-2010 at 12:41 AM. 
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