I did something careless (stupid) and plugged the wrong AC adapter into
my YB 400. The polarity wasn't right, and now it's dead. The digital
display and tuner still seem to work, but there's no sound. I've made
this mistake before with other devices, with no harm done. So does
anyone know, does the YB 400 not have this protection? Or clues to what
it was I fried?

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Posted via a free Usenet account from http://www.teranews.com

You are right, this radio seems to have no such protection.

I did the same thing myself back then, but first blamed it on the AC
adapter. Then I read about the reversed polarity issue.

I was able to trade it in for an YB-500 with a little in-between. But the
YB-400 is a much better radio in my opinion...

Knut O.

"mg4586" skrev i melding
.. .
I did something careless (stupid) and plugged the wrong AC adapter into my
YB 400. The polarity wasn't right, and now it's dead. The digital display
and tuner still seem to work, but there's no sound. I've made this mistake
before with other devices, with no harm done. So does anyone know, does the
YB 400 not have this protection? Or clues to what it was I fried?

--
Posted via a free Usenet account from http://www.teranews.com

Knut Otterbeck wrote:
You are right, this radio seems to have no such protection.

I did the same thing myself back then, but first blamed it on the AC
adapter. Then I read about the reversed polarity issue.

I was able to trade it in for an YB-500 with a little in-between. But the
YB-400 is a much better radio in my opinion...

Knut O.


Ok, thanks . Unbelievable that this radio didn't have such protection
.... all it would have taken is a diode and maybe a couple of other
components. You say you were able to "trade" it ... were you able to get
it back working again?

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You say you were able to "trade" it ... were you able to get it back
working again?

No, I asked the shop to take the radio back and "upgraded" as a thanks for
the favour...

At least now we are aware of the problem with reversed polarities in
different portable radios

Knut O.


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mg4586 schrieb:

I did something careless (stupid) and plugged the wrong AC adapter into
my YB 400. The polarity wasn't right, and now it's dead. The digital
display and tuner still seem to work, but there's no sound. I've made
this mistake before with other devices, with no harm done. So does
anyone know, does the YB 400 not have this protection? Or clues to what
it was I fried?

The most likely component is the audio amp (LA4550), these are quite
sensitive to reverse voltage. The rest is behind some voltage regulator
at least. Check the LA5005 output to make sure it's OK.

Stephan
--
Home: http://stephan.win31.de/
Queueing Theory à la Murphy: The folks in front of you take an
eternity, you're through in a second...

I always take pains to be sure I use the right adapter and the polarity
is right.When in doubt,I use my Fluke multimeter.
cuhulin

Stephan Grossklass wrote:

The most likely component is the audio amp (LA4550), these are quite
sensitive to reverse voltage. The rest is behind some voltage regulator
at least. Check the LA5005 output to make sure it's OK.

Stephan

Thank you ! I will check that out.

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