Re: 465M Junker
That was the problem I had with the modules in the 475. I gave the modules to an experienced assembler who worked on surface mount boards and had a soldering iron that could reach inside and reflow the joints. But unfortunately the assembler had no experience doing that kind of rework and failed to repair the modules. I had to move on.toggle quoted messageShow quoted text
Sent: Sunday, January 05, 2020 8:59 AM
Subject: Re: [TekScopes] 465M Junker
On Fri, Jan 3, 2020 at 05:41 PM, KB6NAX wrote:
.... After fussing and fuming II encountered a very similar problem on a 2213A, in which the attenuation modules are also plugin type and it has two on each channel. The levels where all over the place but sometimes things seemed to settle after unplugging and plugging the modules several times or wedge them with some foam squares against the metal top covers to immobilize etc. But then the problem would invariably always return in short order. It looked like a bad contact on the pins of the modules or that the contact fingers on the receiving board where perhaps stretched or loose. But in the end it turned out to be a cold solder joint at one of the pins right inside one of the attenuation modules. In the end opened all four modules and carefully reflowed the solder joints on the pins and all problems where gone for good. There where at least one or more really poor looking solder joints inside each module. The thread I opened about this is somewhere here among the group messages.