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Other Video Blogs / Re: BK Precision Model 1420 Oscilloscope Repair
« Last post by KE4EST on January 08, 2019, 02:15:15 PM »
Here is part two.  The little scope is working.  I also show using it with a Mr. Carlson curve/signature tracer example.

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Other Video Blogs / BK Precision Model 1420 Oscilloscope Repair
« Last post by KE4EST on January 01, 2019, 01:02:00 AM »
Hello all and Happy New Year!!!
I came across this small 1420 and want to turn it into a simple curve/signature tracer.
Yes, before you ask it will be Mr. Carlson inspired. :D

I already built the circuit from his design and have it in its own enclosure.  I just run the leads to the channel inputs of any two channel scope.
This will be a good scope to do that with full time, instead of having to move wires around all the time and reset up my main scope for other things.

https://www.youtube.com/watch?v=HnzzifZzGak
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Other Video Blogs / Re: Heathkit IM-28 Restore
« Last post by KE4EST on December 27, 2018, 04:23:23 PM »
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You did find a schematic for it? Cool, hope you can upload it.  ;D
O.k. on that  board and I'll reimburse you off course.
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Electronic Video Blog / Re: #146 Johnson Valiant Quick Repair
« Last post by The Radio Shop on December 27, 2018, 08:49:38 AM »
Thanks Chuck. Always something lurking in these rigs.
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Cool deal.  I think I have seen a schematic for that model. I will have to dig around.
I will get in touch with you today on the board. PM me if you do not hear anything. So busy.
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I thought you'd like to have this posted here. I only post in a few forums, that's it. The Fuction Generator works fine since the repair, no problems. I didn't have a schematic and didn't find one either. Usually these chinese thingies either work, do not work, or fail after a very short time. It is funny how a little tiny cap like this takes the whole thing down. Anyway... Buddy, if you think of it, I need that interface board (on that PM). Thank you! :)
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Ham Radio Circuits and Repair / Re: IC-751 PLL weird problem
« Last post by VE1IC on December 26, 2018, 11:51:32 AM »
I think it has something to do with the PLL IC's. There is a contraption made called a swallow counter. Problem is I don't know which IC's go for the 10khz.
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Electronic Video Blog / Re: #146 Johnson Valiant Quick Repair
« Last post by Chuck on December 26, 2018, 11:16:17 AM »
Great video Buddy, now i'll have to check  a couple of things on my Valiant.

Chuck
73's  N8BOP
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Wow, Great job at hunting down the faulty component.
Must have been bad from the beginning.
Thanks for posting this unique bit of troubleshooting.

Using the brute force method like that really helps on the tough ones.
On older gear I use a low voltage battery on the rail. Then start checking the voltage as I move away from the battery.

The way you did it works a treat for those hard to read schematics or no schematic.

Thanks again for this valuable information.
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