Repair and Re-build of SE Labs SM 112 Scope

[Geaney]

Well the weather has warmed a bit (at least for now) so I've started to have a look at the SM112. A lot of previous work has been done on it and the quality of workmanship is pretty bad. There are three boards in the power section and all look to have been repaired. The fourth (HT) looks largely untouched.
I removed the modules for the channels and for the timebase and I had a very close look at the timebase main board. This was covered in flux and solder splashes so someone spent a lot of time on this and left it in a dodgy state. I found solder splashes lying across tracks so that's probably what happened - one day I popped it up on the bench and something shorted out.

So I've spent a while cleaning it all up so it looks half way decent. There are some very poor solder joints that will need attention before going further. Some large caps in the power supply also look bulged at the ends so I'll need to replace those as well. There are various heat-discoloured resistors as well so I'll replace those too.

I made a video clip but despite re-encoding it a few different ways I can't get it to upload to YouTube. I'll keep at it.

This one could indeed take a while but at least I've got started on it.

Cheers, John