HELP !

I have a piece of audio equipment (M-Audio 410 firewire audio
interface) that
requires 12V DC (1000mA) I bought it in the states with a US adapter
and step down convertor (240-110). Everything was working fine until I
thought I should go out
and buy a UK voltage adapter to replace the cumbersome setup of AC
adapter - step down transformer - US/UK plug.


I bought a '1000mA Variable Voltage AC/AC Adapter' with a 12V setting.
After plugging it in, the lights came on and then went out on the
device, andthen nothing! Is it because I bought an AC/AC adapter and
not AC/DC adapter?? Could this cause the kit to stop working?? Its
gonna be such a pain to try and return this to the store I bought it
from in the US (Im in London), any help would be seriously appreciated.



Regards,
Nick.

wrote:
Its
gonna be such a pain to try and return this to the store I bought it
from in the US (Im in London)

Why should the store take it back? It's your mistake and you have blown
it up!

I did'nt mean return it for a replacement. I was thinking perhaps it
was repairable? Does anyone know? based on the above, do you think I
have blown it up?!!

wrote in message
ups.com...
I did'nt mean return it for a replacement. I was thinking perhaps it
was repairable? Does anyone know? based on the above, do you think I
have blown it up?!!

If the power supply that you've bought is genuinely AC output, then the
piece of kit is not going to have liked it much, for sure. There are two
simple possibilities. First is that there is an internal fuse of some
description. May be a wire ended or surface mount type, or may be a fusible
resistor. Second possibility is that there is a polarity protection diode
across the power input. If you put AC directly across a diode, it will fail
short-circuit in fairly short order. However, in either case, it's not to
say that the circuitry beyond didn't suffer damage before the diode failed,
or fuse blew. I would take a look inside first, provided that you're
reasonably sure what you're looking for, and have a meter to check said
components if you find them.

Arfa

Dear oh dear oh dear. Just received this e-mail from this **** who blew
his kit
up by shoving ac up a dc socket. What on earth are these ****s doing
anywhere
near electrical equipment? He's now trying to defraud the suppliers and
blame them
for his incompetence!

-------------------------------------------------------------------------------------------------------------------------


Hey ,

If you've nothing better to add than this ****, please refrain from
posting to these boards.

Nick.



Just Another Theremin Fan wrote:
wrote:
Its
gonna be such a pain to try and return this to the store I bought it
from in the US (Im in London)

Why should the store take it back? It's your mistake and you have blown
it up!

wrote:
People post to these boards to get advice from people who have
more knowledge than themselves

For Krisake... Kids are taught the difference between AC and DC
in primary school here in the UK!!!!!

Why not go whole hog and plug it into the water supply?!!!!

And tell that pratt Bush to get the hell out of Iraq as well!!!

The power supply you connected, probably did not match to the required
specifications. You will have to send the unit back for service, unless you
are proficient to do the service work on it.

--

Jerry G.
======


wrote in message
oups.com...
HELP !

I have a piece of audio equipment (M-Audio 410 firewire audio
interface) that
requires 12V DC (1000mA) I bought it in the states with a US adapter
and step down convertor (240-110). Everything was working fine until I
thought I should go out
and buy a UK voltage adapter to replace the cumbersome setup of AC
adapter - step down transformer - US/UK plug.


I bought a '1000mA Variable Voltage AC/AC Adapter' with a 12V setting.
After plugging it in, the lights came on and then went out on the
device, andthen nothing! Is it because I bought an AC/AC adapter and
not AC/DC adapter?? Could this cause the kit to stop working?? Its
gonna be such a pain to try and return this to the store I bought it
from in the US (Im in London), any help would be seriously appreciated.



Regards,
Nick.

How are your Maplins shares doing?
I live in Canada, and have shares in the Hudson's Bay Company. This one
started out by selling beaver skins. I think they still do!

--

Jerry G.
======


"Just Another Theremin Fan" wrote in message
oups.com...

wrote:
The
question was, is there any hope in repairing this or do I just buy
another?????

Buy another and do it again, I have shares in Maplins stock.....

wrote:
HELP !

I have a piece of audio equipment (M-Audio 410 firewire audio
interface) that
requires 12V DC (1000mA) I bought it in the states with a US adapter
and step down convertor (240-110). Everything was working fine until I
thought I should go out
and buy a UK voltage adapter to replace the cumbersome setup of AC
adapter - step down transformer - US/UK plug.


I bought a '1000mA Variable Voltage AC/AC Adapter' with a 12V setting.
After plugging it in, the lights came on and then went out on the
device, andthen nothing! Is it because I bought an AC/AC adapter and
not AC/DC adapter?? Could this cause the kit to stop working?? Its
gonna be such a pain to try and return this to the store I bought it
from in the US (Im in London), any help would be seriously appreciated.



Regards,
Nick.



You may be lucky and just shorted a protection diode on the power input,
it's worth checking. You can't legitimately return it to the store, you
broke it.

ha escrito:

HELP !

I have a piece of audio equipment (M-Audio 410 firewire audio
interface) that
requires 12V DC (1000mA) I bought it in the states with a US adapter
and step down convertor (240-110). Everything was working fine until I
thought I should go out
and buy a UK voltage adapter to replace the cumbersome setup of AC
adapter - step down transformer - US/UK plug.


I bought a '1000mA Variable Voltage AC/AC Adapter' with a 12V setting.
After plugging it in, the lights came on and then went out on the
device, andthen nothing!

have you tried it again with your original setup of stepdown
transformers?
if still dead you'll have to do as the others suggest and check the
diodes across the input. it'd probably be cheaper to just pay someone
locally to fix it than ship it to USA. look for a repair shop
-B

The power supply you connected, probably did not match to the required
specifications.

That is tech' speak for "The **** stuck AC up a DC socket"!!!!! LOL

"Jerry G." wrote:

How are your Maplins shares doing?
I live in Canada, and have shares in the Hudson's Bay Company. This one
started out by selling beaver skins. I think they still do!


Do you have a lot of use for beaver skins around the shop?


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

wrote in message
oups.com...
HELP !

I have a piece of audio equipment (M-Audio 410 firewire audio
interface) that
requires 12V DC (1000mA) I bought it in the states with a US adapter
and step down convertor (240-110). Everything was working fine until I
thought I should go out
and buy a UK voltage adapter to replace the cumbersome setup of AC
adapter - step down transformer - US/UK plug.


I bought a '1000mA Variable Voltage AC/AC Adapter' with a 12V setting.
After plugging it in, the lights came on and then went out on the
device, andthen nothing! Is it because I bought an AC/AC adapter and
not AC/DC adapter?? Could this cause the kit to stop working?? Its
gonna be such a pain to try and return this to the store I bought it
from in the US (Im in London), any help would be seriously appreciated.



Regards,
Nick.


The device *should* have reverse polarity protection, which could be either
(1) a reverse-biased diode across the input, or (2) a diode in series with
the + rail after the power jack.

What will happen if you connect an AC adaptor? Well, in the first instance
the diode will short out the negative component of the AC supply, and allow
the positive component to pass. The shorted negative component will quickly
either damage the power supply or blow a fuse in the appliance itself,
provided the manufacturer has been thoughtful enough to add one to the
design. At that price, they damn well should. Hopefully all this will happen
before any other damage can be done.

In the second instance, the series diode will rectify the AC to rough, half
wave DC. This could explode electrolytic caps and cause the internal
regulator to malfuction, with possibly catastrophic results. The fuse may
well not fail until it is too late, if at all as there may be no overcurrent
situation until a semiconductor fries.

The only way to know for sure what the damage is, is for a tech to look
inside. You may get very lucky and it could just be an internal (probably
miniature surface mount) fuse. OTOH, it could be a write off, there's no way
to tell from the outside. If specialist SMD ICs are blown, forget about a
local tech repairing it, it will be a manufacturer/dealer repair only, and
they might consider it uneconomical to service.

Dave