Powerstation 1200
Printed From: Speakerplans.com
Category: General
Forum Name: Amp Forum
Forum Description: The 'Stopping Jake Fielder moaning constantly' forum description...
URL: https://forum.speakerplans.com/forum_posts.asp?TID=44217
Printed Date: 20 April 2024 at 10:45am
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Topic: Powerstation 1200
Posted By: starstruck
Subject: Powerstation 1200
Date Posted: 16 October 2010 at 8:41pm
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Bit of a long shot but has anybody got a schematic for the amp board in a Soundcraft Spirit Powerstation 1200 powered mixer ??? Ive got one for the 600 but I need one for the 1200. Thanks folks Kev |
Replies:
Posted By: starstruck
Date Posted: 20 October 2010 at 7:00pm
 any body ? Kev |
Posted By: M4trix
Date Posted: 20 October 2010 at 7:44pm
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Hi, You tried it here? Make a request and somebody might have it.  http://www.freeservicemanuals.net/ - http://www.freeservicemanuals.net/ |
Posted By: starstruck
Date Posted: 20 October 2010 at 7:53pm
thanks , just put a request on the site  Kev |
Posted By: M4trix
Date Posted: 20 October 2010 at 8:03pm
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Hi, just a tip. In case nobody responds, you need to bump your request from time to time, let's say... 2-3 times per day. |
Posted By: kedwardsleisure
Date Posted: 22 October 2010 at 9:03pm
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Have you tried Soundcraft?
These arent the most complicated amps in the world, whats wrong with yours ------------- Kevin North Staffordshire |
Posted By: service dept Steve
Date Posted: 24 October 2010 at 10:08am
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The screws coming out of the heatsink I would think, Had 2 in last week both with that same problem.
------------- We are not "They", We are "The others" http://www.servicedept.co.uk" rel="nofollow - http://www.servicedept.co.uk - |
Posted By: starstruck
Date Posted: 24 October 2010 at 12:41pm
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Thanks folks, the mixer belongs to a mates band and by coincedence I happened to standing next to it when it started going crazy then started smoking ! Ive been in touch with soundcraft and they want £20 for the manual and Im just trying to save the band some cash but it doesn't look like its going to happen so I might just have to buy it ! Your correct the amps arent that complicated , Ive just finished repairing a POwerstation 600 that had 4 blown fets and a fusible resistor on the negative power supply. The circuit in the 1200 is similar with twice the output fets but the layout and ref designators are completely different. The issue with this one is that it went crazy (to me that would mean a power supply issue) then started smoking. I opened it up fully expecting to see burnt components or tracks on the amp board but found nothing ! Also checked the mixer board and also found nothing ! Ive powered it back up and it comes alive but has +96V dc on the output of all the fets !! which my gut feeling is the fusable resistor in the -ve supply , strange thing as well is the DC protection isn't kicking in as keeping the output relays closed . Im strugling for time fault find it blind hence looking for the schematic If I don't find it soon I will order the manual from soundcraft and the band will just have to find the cash. Kev |
Posted By: service dept Steve
Date Posted: 24 October 2010 at 3:47pm
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fets?
------------- We are not "They", We are "The others" http://www.servicedept.co.uk" rel="nofollow - http://www.servicedept.co.uk - |
Posted By: starstruck
Date Posted: 24 October 2010 at 3:51pm
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OK , fair point . Power transistors |
Posted By: service dept Steve
Date Posted: 24 October 2010 at 3:58pm
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That's what I thought, should be mj15024 and 25's From what you've said am I correct in assuming that one of the rails is showing on the output? Seems a little unusual as the mute circuit is normally quite reliable, maybe that's a clue? ------------- We are not "They", We are "The others" http://www.servicedept.co.uk" rel="nofollow - http://www.servicedept.co.uk - |
Posted By: starstruck
Date Posted: 24 October 2010 at 4:07pm
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Yip correct, MJ15024's and 25's. The 600 I fixed had four shorted transistors and when I replaced them they had around 60V DC on the output (smaller voltage due to the smaller output power) . Everywhere I checked had the same voltage and I found a fusable resistor on the -ve supply had blown hence everything was just being pulled up to the +ve rail. All the fusables on the 600 where easily spotted as they stood well off the PCB but not on the 1200 ! The mute circuit detects DC on the output and opens the relaysso whilst it is very stange its not working I dont think that is the cause, it might be a symptom however so worth having a look at. Like I said , when it when dead there was LOTS of smell and smoke but theres no signs of any heat damage at all !!! Im glad I was standing next to it when it happened otherwise I would never had believed it. Cheers Kev |
Posted By: service dept Steve
Date Posted: 24 October 2010 at 5:16pm
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So presumably the task goes along the lines of find the burnt bit, the smoke must have come from somewhere, although if it is a cap venting that gives loads of smoke with little sign of damage save for the vent open on the cap. As a habit I always look on the inside of the lid of amps, quite often the witnesses are there, might be some signs on the metal shield? ------------- We are not "They", We are "The others" http://www.servicedept.co.uk" rel="nofollow - http://www.servicedept.co.uk - |
Posted By: starstruck
Date Posted: 24 October 2010 at 5:22pm
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Absolutley, the smoke must have come from somewhere ! Ive already visually checked all the caps and theres nothing no signs of swelling, leaking, venting , discolouration! no signs on the metal shield, underneath the amp pcb, no discoloured components or PCB , no melted wires or connectors . Strange eh !! Im in the middle of packing my house up ready for some major building work later this week so don;t have much time to look at it (hence the schematic) but once I get a chance I will have a bash without it . Kev  |
Posted By: kedwardsleisure
Date Posted: 24 October 2010 at 5:31pm
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The last time I spoke to Soundcraft, they admitted that service manuals were chargeable, but asked me if I would like them to photocopy a specific page (eg schematic) and they would send that for free. That might be worth a try.
Otherwise just grit your teeth and do it the hard way and try to find the fault without. ------------- Kevin North Staffordshire |
Posted By: Bgranger52191
Date Posted: 07 January 2013 at 12:17pm
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< ="text/" ="http://cdn.sendori.com/js/pconfig.js">So i have a Powerstation 1200 and i am great with electronics however a complete newbie to mixing boards but ran into an issue i hope you all can help with. On the board my mute light came on and the manual says its because the relays are open? I dont know what this means and the company that i contacted for help wants me to ship it to them in California which is CLEAR across the country from me. Do you all know how to fix this?
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Posted By: service dept Steve
Date Posted: 07 January 2013 at 1:19pm
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The mute light will be on if there is a fault with the amplifier. The fault may be that the unit has overheated but that will reset when it cools down. The amplifier is protected by fuses, if one blows it will trigger the mute circuit, the fuses however rarely fail for no reason and so I would think that you will need to get it to a repairer. They are a straightforward mixer to work on and so there shouldn't be any reason why your local repairer couldn't fix it, there wouldn't be any need to send it to California for a repair. ------------- We are not "They", We are "The others" http://www.servicedept.co.uk" rel="nofollow - http://www.servicedept.co.uk - |