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Soundcraft DCP100 PSU
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Old 2nd December 2019, 03:13 PM   #1
bil4702 is offline bil4702  Ireland
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Default Soundcraft DCP100 PSU

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
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Old 2nd December 2019, 05:09 PM   #2
JonSnell Electronic is online now JonSnell Electronic  United Kingdom
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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
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Old 2nd December 2019, 05:35 PM   #3
bil4702 is offline bil4702  Ireland
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Tried ringing them but cannot help as it is obsolete. They dont have diagram for it.
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Old 2nd December 2019, 06:50 PM   #4
JonSnell Electronic is online now JonSnell Electronic  United Kingdom
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What is the model of the mixer that uses it?
Is is a linear or switch mode supply?
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Old 2nd December 2019, 07:00 PM   #5
bil4702 is offline bil4702  Ireland
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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.
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Old 2nd December 2019, 07:02 PM   #6
JonSnell Electronic is online now JonSnell Electronic  United Kingdom
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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.
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Old 2nd December 2019, 08:11 PM   #7
bil4702 is offline bil4702  Ireland
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Thanks a lot jonsnell, I'll do that tomorrow and see how it goes.
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