Motor transistors keep dying on me

[radardoug]

Have you double checked that there is no connection between the transformer windings that supply the two motors? Your symptoms sound like exactly that fault. Those windings need to be completely separate. If one transistor hangs in there fine, it points to a wrong connection between supplies.

 

[EmilFrid]

@radardoug thanks, I will have a look tomorrow. I hope there's no catastrophe waiting for me

 

[CJ]

What kind of insulator mounting kit are you using?

Are you ready to kill somebody yet?

Don't worry, the more pain, the more joy.

 

[JohnRoberts]

It's always the last thing you fix....

JR

 

[EmilFrid]

What kind of insulator mounting kit are you using?

I've tried a few different ones. I don't know what they are called in English but it's "glimmerskiva" in Swedish, which seems to be the standard. Haven't had issues with them before.

Are you ready to kill somebody yet?

Yes, myself! This is really taking a toll on my self-esteem as a repair guy. I usually manage to fix stuff

Don't worry, the more pain, the more joy.

Thanks, I will try to keep this in mind.

I'm writing a thesis all week so might not be able to do anything with the machine until Friday. But maybe we'll have time to make some fault hunting plans during the week. I'm very grateful for everyone chiming in.