console psu upgrade?

Archived from groups: rec.audio.pro (More info?)

hello,
I have a soundcraft 6000 (24x16) with the regular psu cps450. the psu
failed a few months ago for the first time. the 17V rail broke down. I
brought it to a technician and after repair I was told it was a contact
problem. 3 weeks ago the same happened again. I decided to have a look
myself, and it was easy to find where the technician did the repair. at
the connector from the transformer to the board for the 17v rail, there
were cold solderings, and abviously the technician did connected two
points on the board with soldering wire, the connection on the board
oviously did not work anymore.?. beside of this I realized that the
connector was getting so hot, that some of the plastic on the connector
melted, it was a problem to disconnect it. I did resolder all the
contacts of the plug connection and the psu worked again, till a few
weeks ago... obviously at the plug-connection from the transformer to
the board it is getting so hot, that after a while the contacts fail,
or the plug and the cables...

I ordered new capacitors for the psu today, but I wonder if the console
brings the psu to break down because of to much current needed,
although my console doesn't have to much channels for it's series. is
there a way to upgrade the psu?

In addition I ordered new op-amps for the master section which are
supposed to need more current... I read most of the threads concerning
op-amps-upgrade and it seems the psu shouldn't overload if you only
upgrade the op-amps in the master-section.

few advices on what could cause the psu to fail and how to resolve the
problem are welcome!

Archived from groups: rec.audio.pro (More info?)

Does the power supply have the proper size fuses?.... where is the
connector getting hot? is it on the 17V output?..... possibly the problem is
in the board rather than the power supply? At least a possibility worth
considering.

Rgds:
Eric

"matiss" <logiciel@web.de> wrote in message
news:1122848457.263434.272320@g44g2000cwa.googlegroups.com...
> hello,
> I have a soundcraft 6000 (24x16) with the regular psu cps450. the psu
> failed a few months ago for the first time. the 17V rail broke down. I
> brought it to a technician and after repair I was told it was a contact
> problem. 3 weeks ago the same happened again. I decided to have a look
> myself, and it was easy to find where the technician did the repair. at
> the connector from the transformer to the board for the 17v rail, there
> were cold solderings, and abviously the technician did connected two
> points on the board with soldering wire, the connection on the board
> oviously did not work anymore.?. beside of this I realized that the
> connector was getting so hot, that some of the plastic on the connector
> melted, it was a problem to disconnect it. I did resolder all the
> contacts of the plug connection and the psu worked again, till a few
> weeks ago... obviously at the plug-connection from the transformer to
> the board it is getting so hot, that after a while the contacts fail,
> or the plug and the cables...
>
> I ordered new capacitors for the psu today, but I wonder if the console
> brings the psu to break down because of to much current needed,
> although my console doesn't have to much channels for it's series. is
> there a way to upgrade the psu?
>
> In addition I ordered new op-amps for the master section which are
> supposed to need more current... I read most of the threads concerning
> op-amps-upgrade and it seems the psu shouldn't overload if you only
> upgrade the op-amps in the master-section.
>
> few advices on what could cause the psu to fail and how to resolve the
> problem are welcome!
>
>

Archived from groups: rec.audio.pro (More info?)

thanks very much for your help. I think the fuses are alright. it's the
plug at the 17V connection which is getting hot, as well as the board
around this plug as it got a light brwon colour. the 17V rail is the
audio rail of the console. the console did behave a little strange in
the last few weeks, as it sometimes did some short time "rumble-like"
noise, which I think is because of the power supply. first came the
powersupply faillure, then the board sometimes was behaving strange
before the next power-supply faillure came. I will try to find a
suitable connection, a similar or even same one to the original is
impossible to find. anyway the power-supply needs a new plug.
thanks for your help!

Pooh Bear wrote:
> "Eric K. Weber" wrote:
>
> > Does the power supply have the proper size fuses?.... where is the
> > connector getting hot? is it on the 17V output?..... possibly the problem is
> > in the board rather than the power supply? At least a possibility worth
> > considering.
>
> He already said an internal connector in the PSU is getting hot. The relevant
> connector is *worn out* and needs to be replaced. It's getting hot because its
> contact resistance has gone high because it's tarnished or whatever, probably in
> part due simply to age. The heat generated melts the plastic of the connector
> housing. This is a classic failure mode. You simply need to replace the worn out
> part.
>
> That's it.
>
> No Voodoo !
>
> Graham

Archived from groups: rec.audio.pro (More info?)

"matiss" <logiciel@web.de> wrote in message
news:1122848457.263434.272320@g44g2000cwa.googlegroups.com...
> hello,
> I have a soundcraft 6000 (24x16) with the regular psu cps450. the psu
> failed a few months ago for the first time. the 17V rail broke down. I
> brought it to a technician and after repair I was told it was a contact
> problem. 3 weeks ago the same happened again. I decided to have a look
> myself, and it was easy to find where the technician did the repair. at
> the connector from the transformer to the board for the 17v rail, there
> were cold solderings, and abviously the technician did connected two
> points on the board with soldering wire, the connection on the board
> oviously did not work anymore.?. beside of this I realized that the
> connector was getting so hot, that some of the plastic on the connector
> melted, it was a problem to disconnect it. I did resolder all the
> contacts of the plug connection and the psu worked again, till a few
> weeks ago... obviously at the plug-connection from the transformer to
> the board it is getting so hot, that after a while the contacts fail,
> or the plug and the cables...




You can cut off the faulty connector and remove the socket, then hard-wire
the cable from the transformer to the PCB.


Gareth.

Archived from groups: rec.audio.pro (More info?)

matiss wrote:

> thanks, I will try it that way, as I can't find a suitable 6-pin
> connector.

Beware of putting stress on the pcb foil if you do this ! It can tear off quite
easily - especially so if it's been subjected to high temps for along time as
you seemed to imply.

I'm sure you *can* get a suitable connector. I expect you're looking in the
wrong places. Is it by any chance one on a 0.2" or 0.187" pitch ?

Phoenix Contact are a likely suitable source for example.

Graham