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Old 08-24-2013, 07:37 PM
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TinCanAlley TinCanAlley is offline
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I managed to get to good waveforms from the convergence section (easiest to get to and many test points). The forms matched almost completely. Then things went wrong. I think there's a problem with the 10x probe. It's a heathkit, so I'm going to take it apart and see what might be going wrong.
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Old 08-24-2013, 10:14 PM
DaveWM DaveWM is offline
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if you are getting good wave form the 170v pp then trace on through and see if you can see it getting to the base of the blanker

Last edited by DaveWM; 08-24-2013 at 10:26 PM.
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Old 08-25-2013, 11:25 AM
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TinCanAlley TinCanAlley is offline
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Quote:
Originally Posted by DaveWM View Post
if you are getting good wave form the 170v pp then trace on through and see if you can see it getting to the base of the blanker
I think the 10x probe is defective (it is 57 years old). I found it difficult to not only get the signal with it, but to keep it. Tapping it caused glitches. I looked over the schematics and it's pretty simple, but I don't like how the tip is designed. It's just a screw-in tip and the wire to it just hangs out the end of the probe and then the tip is attached. The wire just sit loosely in the tip, not soldered or attached in any way.

I've ordered a new probe and the BNC to banana plug converter. It should be here on Wed and I'll be able to get more done.
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Denon 5803A, Pioneer DVL-700, Pioneer CT-W603RS, Toshiba HD-A3, D-Link DSM-520, Dish VIP-722, Polk 1.2TL, CSi5, LS/fx, RT-800 and PSW-650
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