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Soundcraft Powerstation 1200 Buzz
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Old 29th March 2012   #1
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Soundcraft Powerstation 1200 Buzz
Hello,

I have a new fault with a Soundcraft Powerstation 1200 that I have, It buzzes loudly even when the power amp level (and everything else) is turned down.

It also does it when the mixer part of the unit is being used into another power amp, but only when the master fader is pushed up.

I have had a look inside and tightened the heatsink, checked for loose earth connections etc.

Everything else seems to be working as normal, it has always seemed quiet (since I got it second hand about 2 years ago) compared to the 600 version though.

Any ideas before I drop some cash and recap it.

Thanks
Alex
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Old 29th March 2012   #2
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Are the power amps still working.
A buzz/hum that is not a groundloop, or a mechanical transformer buzz must come from the power supply.
Maybe a faulty smoothing cap in the supply.
Especially when it started slowly.
Measure rail voltages with a DMM set to AC.
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Old 1st April 2012   #3
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As always, it would be really helpful if you could identify the frequency of the hum/buzz.
Best,
Ike
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Old 1st April 2012   #4
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Thanks guys, there have been developments...

I'm told it started to smell bad so I've taken it out of action, when I get a chance I'll have a look and re assess the situation...

I'm sure I'll be back
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Old 1st April 2012   #5
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Hi
If you intend to go 'playing' in there take great care as the DC supplies are around 80 Volts or more (160 Volt total) and the capacitors will make a heck of a spark if you accidentally short something.
Unless you can identify the 'smell' it may well be beyond mere capacitors.
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