Need help replacing some transistors on hafler dh220

[avionic]

To be clear.....if you have no idea which pin is E, C or B on a transistor and you have one of these test tools at your disposal, you can hook up the leads of the tool to leads of the transistor in any which way, and any which order and the tool will identify the leads of the transistor. It will tell you which is E, which is C and which is B. Do I have this right?

Correct..... There pretty smart little testers.

 

[avionic]

I bought mine directly from Peak in the UK.

https://www.peakelec.co.uk/acatalog/dca55-peak-atlas-dca-semiconductor-component-analyser.html

 

[Blue Shadow]

Did anyone mention that you can determine the pinout of the working installed transistors using the schematic? Since the unit works, the transistor is installed correctly and the schematic shows which leg will be the C-B-E.

 

[avionic]

1978 datasheet for 2N5550
http://www.datasheetarchive.com/pdf...50&manufacturer=Micro Electronics&part=2N5550

 

[restorer-john]

There pretty smart little testers.

I can't take credit for this, but it was in a discussion about these testers and gave me a laugh...

"You can also use your hand to identify a tranny, don't know about the bipolar ones though"

reply: "And what about the rest of the IGBT community?"

 

[Silentnet]

To be clear.....if you have no idea which pin is E, C or B on a transistor and you have one of these test tools at your disposal, you can hook up the leads of the tool to leads of the transistor in any which way, and any which order and the tool will identify the leads of the transistor. It will tell you which is E, which is C and which is B. Do I have this right?

Sure does look that way.