Technical, Techniques, Hints, and Tips > Radio Equipment

Accidentally reversed battery polarity on Tx

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johndora:
..and there was that awful smell.


It's an old 40MHz unit and I wonder if the damage is repairable. When trued on, the Rx just makes the servos chatter, randomly.


What would have burned out?


Is it repairable?


Thanks!

MikeMcP:
once the magic smoke gets out, it's incredibly difficult to get it back in again
RIP

HMS Invisible:

--- Quote from: johndora on June 14, 2024, 06:33:32 pm ---..and there was that awful smell.


It's an old 40MHz unit and I wonder if the damage is repairable. When trued on, the Rx just makes the servos chatter, randomly.


What would have burned out?


Is it repairable?


Thanks!

--- End quote ---
Have a look inside and take a photo of where it smells. It is most likely to be a toasted regulator that doesn't have reverse protection.

johndora:
Thanks, will do.

[/size]It's recently been given to me and when I took it apart three of six screws were missing. Maybe the problem was there before and someone tried. I've a pal who's a wizard with electronic repairs who will look at it for me.[size=78%]

Fastelectrics:
Most would have a reverse polarity protection diode to prevent this from happening. It may be something simple if you can locate the burnt out component(s).

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