Zoll 1600 Defibrillator Repair

[vargasmir01]

Hello, this is my first message on the eevblog forum but I've been a long time viewer of the youtube channel and now that i'm on a bit of a trouble this is the first place that came to my mind (Also sorry for any mistakes I'll try to make as few as possible)

 The problem began when we started testing a defibrillator that was in our university and was supposedly not working. Repairing and restoring this defibrillator is the main project in one of the classes I'm taking right now, and at first, the defib worked great without any noticeable problems.


We got the service manual and we started the test routines the manual stated... Then something blew up inside, the defib jumped half an inch and stopped working.

No exterrnal damage could be seen altough a strong burnt smell appeared on the area, upon taking it apart we found that two fuses had blown up and a transistor (BSS295) had exploded also.

And the problem is that I can't seem to find a place where to buy this transistor or how to make a replacement board to make the defib work again, also I don't have lot of experience working with n channel transistors.

Help? Please

[Richard Crowley]

Your thumbnail photos are too small and out of focus for us to see anything useful.
And Imageshack seems unwilling to offer the full-size images even for download.
Making people download images (vs. simply linking to them) is rather hostile and will turn-off many people who might be able to help you.
Imageshack isn't doing you any favors here.

We are assuming you don't have a schematic diagram (which puts you at a significant disadvantage).
We are also assuming that you are doing this only as a laboratory exercise and do not intend to put the unit back into life-saving service.   

Have you attempted to find a substitute for the transistor?

Please complete your profile to at least disclose what country you are in.

[kolbep]

I would hate to be the test subject when you get it working again   

[vargasmir01]

Ok, I've changed the images, sorry for that :S it's the my first interaction with forums in a long time and back in the day imageshack was the way to go xD now it's all crappy and stuff.

And to answer your question, no it is not supposed to go into hospital service again, we have a defibrillator tester that will measure the output once we get it running again. On that basis, we need to get it working and it needs to be able to deliver the 90% of the shock capacity selected by the user.

And thanks for the advice