Soundcraft DCP100 PSU

[bil4702]

Hi all, I have a Soundcraft DCP100 PSU that has developed a hum.
I am unable to find a schematic for it anywhere.
The problem is R5 has burnt out and is black so I cant identify its value.
It runs in parallel with a small cap between chassis ground and 0v.
If anyone has the schematic, or can have a peek inside one that they own or can suggest a suitable value for this location I would be most grateful.
Thanks,
bce

 

[JonSnell Electronic]

Have you tried ringing your local soundcraft distributor?Sound Technology plc
Letchworth Point
Letchworth
SG6 1ND
(t) 01462 480000
(e) info@soundtech.co.uk

(w) http://www.soundtech.co.uk

or even ringing Soundcraft Direct? (Switchboard is 01707 6685000

 

[bil4702]

Tried ringing them but cannot help as it is obsolete. They dont have diagram for it.

 

[JonSnell Electronic]

What is the model of the mixer that uses it?
Is is a linear or switch mode supply?

 

[bil4702]

Its a quite old linear PSU, fairly simple +/- 15v regulated plus 48v for phantom supply, its just the value of the burnt resistor I want to get.

 

[JonSnell Electronic]

R5 is a 12R resistor connecting the 0v to a common ground or earth point.
If it has burnt out in the past there has been an issue with a connection to the ground point that was not at ground potential. It is there to form a virtual earth.
Try replacing it. A 1Watt of mostly any low value is sufficient.

 

[bil4702]

Thanks a lot jonsnell, I'll do that tomorrow and see how it goes.

 

[Psypoab]

22 omhs it is r5 resistor - red red black