|Just another Perl shrine|
Re^4: I came, I saw, I ...by afoken (Abbot)
|on Jul 06, 2017 at 22:29 UTC||Need Help??|
I hope your dad didn't get in too much trouble for blowing the channel on the scope.
Well, he wasn't fired, and he did not have to pay the damage. In fact, the company was sold later, including his working contract (as usual in Germany at that time). During that time, when TV sets had still a potent high voltage supply and a CRT, a scope could easily be killed by measuring at the wrong place of a TV set with the wrong settings. Nobody is stupid enough to measure the 30 kV at the anode of the CRT, but focus and gate 2 also have a voltage that would be quite unhealty for a scope with a standard probe.
The most expensive equipment I blew up wasn't my fault. The PCB layout engineer changed the orientation of a square micro-controller by 90 degrees but forgot to update the board markets. When a technician installed a socket where the micro would go, she followed the board markings. When I got the board and plugged in the in-circuit emulator, the emulator's interface "pod" belched the magic smoke when I powered the board. That was only about US$2000 to replace.
That's the "oh f***ing s**t" moment. Misplacing the ICE connector is also quote common on our current project, but luckily the ICE is quite robust, cheap, and some really wise man has decided to use a connector pinout for the ICE that makes it really hard to kill the ICE or the controller. We would normally use a keyed connector on the PCB, but that exact version required for the ICE is either close to unobtainium or insanely expensive. And compatible solutions are simply too large. So we placed an unkeyed connector and a tiny dot indicating pin 1 on the PCBs. So far, we have killed no ICE, and except for my 24V mistake, no board.
A co-worker of mine was once subject to the same "fire works" due the same mistake (by a different PCB engineer), but the damage was US$30k.
And that's the moment when you decide to call it a day, go home, and try again the next day.
My dad had a similar experience during his first job in the R&D department of a major electronics company. Consumer
Looking at my damages over time, I see a quite good trend. The damages get smaller. Let's hope the best ...
Today I will gladly share my knowledge and experience, for there are no sweeter words than "I told you so". ;-)