Electronics Forum => Electronic Video Blog => Topic started by: The Radio Shop on May 28, 2016, 06:04:41 PM
Title: #53 HP 410A vtvm repair part 1
Post by: The Radio Shop 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.
Capacitors and resistors: http://www.justradios.com/
Mr. Carlson's Lab, Are your capacitors installed backwards?: https://www.youtube.com/watch?v=BnR_DLd1PDI
Title: Re: #53 HP 410A vtvm repair part 1
Post by: The Radio Shop on May 28, 2016, 06:06:45 PM
Here is the schematics and manual for the diode modification kit.
Title: Re: #53 HP 410A vtvm repair part 1
Post by: The Radio Shop 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.