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Author Topic: #53 HP 410A vtvm repair part 1  (Read 5026 times)

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Offline The Radio Shop

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#53 HP 410A vtvm repair part 1
« on: May 28, 2016, 06:04:41 PM »
In this video we go through this old HP 410a VTVM and replace all the paper capacitors.
We also have to fabricate a new DC probe since the original is damaged.



https://www.youtube.com/watch?v=N7DpyfHZ3cM

Manual link:
http://www.hparchive.com/Manuals/HP-410A-Manual.pdf

Capacitors and resistors:
http://www.justradios.com/

Mr. Carlson's Lab, Are your capacitors installed backwards?:
https://www.youtube.com/watch?v=BnR_DLd1PDI
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Offline The Radio Shop

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Re: #53 HP 410A vtvm repair part 1
« Reply #1 on: May 28, 2016, 06:06:45 PM »
Here is the schematics and manual for the diode modification kit.
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Offline The Radio Shop

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Re: #53 HP 410A vtvm repair part 1
« Reply #2 on: May 29, 2016, 10:14:37 AM »
So I got lucky today and was rambling through some old parts drawers. I found a pack of 20 meg resistors. I went through them and found one that read 22.1 ohms. The DC probe is now complete. I can now troubleshoot the ohms setting and complete this unit.
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