Brooke XPro 3000 power amp power issue. |
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M6dly
New Member Joined: 12 November 2016 Status: Offline Points: 3 |
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Posted: 12 November 2016 at 2:15pm |
Hi all, this is my first post here.
I'm having an issue with a Brooke XPro 3000 power amp that is installed in a club which I maintain. I normally carry out repairs on turntables & DJ equipment, however I gave the sound system an overhaul about 8 months ago replacing the cabling, a couple of speaker drivers and EQing the system to the room. The Brooke amp powers the rooms two bass bins, I was asked last week to set the sound system up for a new mixer they had purchased. So I pluged my laptop into the speaker management unit and proceeded to lower the limiter as I had previously set them very high as the old mixer had a very high output. I decreased the limiter by two db and pop! all the power in the building went! I must at this point make you aware that I am a bit of a noob with an above basic understanding of sound systems and audio electronics. After much swearing I eventually traced the fault to the Brooke amp. So I removed it and took it home... Upon opening it up i found this: http://s105.photobucket.com/user/M6DLY/media/fullsizeoutput_3488.jpeg. - Two dead thermistors! I have replaced the thermistors and also the relay and capacitor however I is still not working It will turn on for a split second then instantly blow the fuse in the plug and trip the power to the wall socket. I have another amp that I will install tonight and will continue to test this one as i can but i have a limited knowledge of repairing amps and really don't know where to go or what to do next.. Any and all help is greatly appreciated. |
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odc04r
Old Croc Joined: 12 July 2006 Location: Sarfampton Status: Offline Points: 5483 |
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Well first of all there is no reason why altering a limiter setting should affect the power supply.
The bits that have died there look like part of a soft start switch on circuit, with the relay there also presumably that is a delay for speaker connection until the amplifier has stabilised. Tbh amplifiers are complicated beasts even for people who know a bit about them. If it is pulling enough current to trash a slow blow mains fuse then you have some dead shorts in there. You can measure the output devices for shorts perhaps. I'd recommend sending it to a professional repairer. In the long run you will save time and money by having confidence in the repair in that something else won't go wrong one month down the line as a secondary failure. |
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Pinyorouk
Young Croc Joined: 31 January 2011 Status: Offline Points: 550 |
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The relay is probably to bypass the thermistors after the initial inrush current to charge the DC capacitors has decayed. Still, unit should be checked by a professional aw advised.
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odc04r
Old Croc Joined: 12 July 2006 Location: Sarfampton Status: Offline Points: 5483 |
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Yeah, could easily be that too. Especially being so close to the thermistors and it is 30A 240V relay too.
Did a similar latching circuit once for a cryopump compressor supply that liked to fire up whether or not the pump was roughed out. After an unexpected power loss event you'd come back to find a ft^3 block of ice otherwise. |
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odc04r
Old Croc Joined: 12 July 2006 Location: Sarfampton Status: Offline Points: 5483 |
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Also I assume that the amp is a toroidal linear PSU. If you are trashing mains fuses and thermistors etc it possibly points to an issue with the transformer/rectification circuitry.
There are some checks you could do regarding transformer winding resistance (with the power off) that are not too hard. Can also check the diode drops of the bridge rectifier. If the smoothing caps had failed you'd probably know about it. |
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M6dly
New Member Joined: 12 November 2016 Status: Offline Points: 3 |
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Hi, Just a quick update on this issue.
Well more of a thank you. I took your advice and decided not to mess about with it any longer and to move it on. I just don't have the know how to progress with it. So i've stuck it up on eBay as spares or repairs - hopefully some one with a little more knowledge than I will be able to repair it. Here's the link if anyone is interested: http://www.ebay.co.uk/itm/BROOKE-XPRO-3000-3U-3000W-Power-Amplifier-Spares-or-Repairs-/262830377353?hash=item3d31e94989:g:FywAAOSwopRYj7Fv%20-%20www.ebay.co.uk/itm/BROOKE-XPRO-3000-3U-3000W-Power-Amplifier-Spares-or-Repairs-/262830377353?hash=item3d31e94989:g:FywAAOSwopRYj7Fv - Brooke XPRO-3000 http://www.ebay.co.uk/itm/BROOKE-XPRO-3000-3U-3000W-Power-Amplifier-Spares-or-Repairs-/262830377353?hash=item3d31e94989:g:FywAAOSwopRYj7Fv - http://www.ebay.co.uk/itm/BROOKE-XPRO-3000-3U-3000W-Power-Amplifier-Spares-or-Repairs-/262830377353?hash=item3d31e94989:g:FywAAOSwopRYj7Fv Thank your again for your advice guys.
Edited by M6dly - 30 January 2017 at 9:44pm |
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kedwardsleisure
Old Croc Joined: 20 January 2009 Location: Staffordshire Status: Offline Points: 4938 |
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Kevin
North Staffordshire |
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stoneworks
New Member Joined: 04 May 2017 Location: Africa Status: Offline Points: 1 |
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Hi guys I am new on this forum I saw this post about this Brooke XPro 3000 I later came across this amplifier on ebay on its sale for the second time. I bought and I have managed to repair its now working. |
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