Studiomaster power supply

Lewie · 16th January 2012

Hi, I'm new here, so please don't bite!

I have a studiomaster p7 desk, the power supply won't power up the desk. I switch it on and 2 red lights come on, but not the green one.

Checked all fuses inside, nothing obviously wrong with it,

Anyone got one, any idea what's up?

Thanks

Mixermend · 17th January 2012

Studiomaster power supplies are usually very straight forward - and use standard voltage regulators.

First check the output voltages from the supply with the mixer disconnected. All present? If so - you probably have a mixer fault.

If one voltage rail is still missing, check the voltage on the input side of the voltage regulator. Is this present?

If so - check the capacitors on the output side of the regulator for short circuits - if they seem OK, replace the voltage regulator.

Lewie · 18th January 2012

Thanks for your reply. The thing thats confusing me is that sometimes it works and sometimes it doesn't. It works if you hit the front panel quite hard! Dodgy connection somewhere maybe?

Mixermend · 19th January 2012

Time to look at the soldering to see if you have a stress fractured joint, or dry joint, that is causing your intermittent problem.

Remember that devices like voltage regulators will run warm (or HOT if there is only a small heat sink) - so thermal stresses can cause problems with solder joints.

Magnifying glass time - or alternatively re-solder every joint that even looks slightly suspect!

If you can power the mixer and vibration test every component (tap with a plastic pen) - you can probably find the exact component and joint (or connector) - causing the fault.

Lewie · 19th January 2012

Good advice, thanks very much!

dillweed4 · 21st February 2012

Useful thread - I've got a studiomaster 16-8-2 desk, needs a bit of work. The level LED's don't work above the subgroups and master channel - can't figure why not. The power supply board did crack, but I soldered all the links back together and superglued the crack. The console works again but no LED's :-(

Sent from my HTC Wildfire using Gearslutz.com

16th January 2012	#1
Lewie Gear interested Joined: Jan 2012 Posts: 3 Thread Starter	Studiomaster power supply Hi, I'm new here, so please don't bite! I have a studiomaster p7 desk, the power supply won't power up the desk. I switch it on and 2 red lights come on, but not the green one. Checked all fuses inside, nothing obviously wrong with it, Anyone got one, any idea what's up? Thanks

17th January 2012	#2
Mixermend Gear maniac Joined: Jan 2006 Location: Exeter UK Posts: 166	Studiomaster power supplies are usually very straight forward - and use standard voltage regulators. First check the output voltages from the supply with the mixer disconnected. All present? If so - you probably have a mixer fault. If one voltage rail is still missing, check the voltage on the input side of the voltage regulator. Is this present? If so - check the capacitors on the output side of the regulator for short circuits - if they seem OK, replace the voltage regulator. __________________ http://www.orchid-electronics.co.uk Audio Engineers Helping To Make Music!

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18th January 2012	#3
Lewie Gear interested Joined: Jan 2012 Posts: 3 Thread Starter	Thanks for your reply. The thing thats confusing me is that sometimes it works and sometimes it doesn't. It works if you hit the front panel quite hard! Dodgy connection somewhere maybe?

19th January 2012	#4
Mixermend Gear maniac Joined: Jan 2006 Location: Exeter UK Posts: 166	Time to look at the soldering to see if you have a stress fractured joint, or dry joint, that is causing your intermittent problem. Remember that devices like voltage regulators will run warm (or HOT if there is only a small heat sink) - so thermal stresses can cause problems with solder joints. Magnifying glass time - or alternatively re-solder every joint that even looks slightly suspect! If you can power the mixer and vibration test every component (tap with a plastic pen) - you can probably find the exact component and joint (or connector) - causing the fault.

21st February 2012	#6
dillweed4 Gear nut Joined: Feb 2012 Location: London, UK Posts: 89 1 Review written	Useful thread - I've got a studiomaster 16-8-2 desk, needs a bit of work. The level LED's don't work above the subgroups and master channel - can't figure why not. The power supply board did crack, but I soldered all the links back together and superglued the crack. The console works again but no LED's :-( Sent from my HTC Wildfire using Gearslutz.com