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Help Fixing a C Audio Pulse 2x1100

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=107008
Printed Date: 03 October 2022 at 12:59pm
Software Version: Web Wiz Forums 12.05 - http://www.webwizforums.com


Topic: Help Fixing a C Audio Pulse 2x1100
Posted By: H3ct0r
Subject: Help Fixing a C Audio Pulse 2x1100
Date Posted: 12 April 2022 at 11:12am
Hello there everyone,

I am currently trying to fix a Pulse 2x1100 for my school and I am kind of back to square one.

I thought that I had fully diagnosed the amp, ended up doing a swap on most of the semiconductors on the board, upgraded the IGBT’s and did a couple of the mods.

After all of this was done, I isolated the power supply and powered it on, It seemed to run fine.

I proceeded to connect the channels back up and powered the amp on, it seemed to run fine at first when all of a sudden, I saw a massive blue spark and both IGBT’s were split in half and my test resistor that I fitted instead of the soft start resistors got super hot. I now find myself with the same issue at the start, channel one tests fine with a multimeter and the output transistors on channel two are shorted, I have completely no idea on how to diagnose what the issue actually is and would need some advice from someone who has a bit more experience than me.

Thanks in advance

Br.

Hector



Replies:
Posted By: H3ct0r
Date Posted: 12 April 2022 at 11:15am
If you need any more info, feel free to ask as I am very keen to get this amp back up


Posted By: cravings
Date Posted: 12 April 2022 at 11:53am
simonp1100 on this forum is the authority on these amps.. search his posts for wisdom, or maybe he'll appear and see this..


Posted By: H3ct0r
Date Posted: 12 April 2022 at 12:31pm
i’ll take a look



Posted By: kedwardsleisure
Date Posted: 12 April 2022 at 12:48pm
Did you replace the insulating washers on the channel output transistors? They can easily punch through at the bolt holes especially if overtightened or old ones reused.

-------------
Kevin

North Staffordshire



Posted By: H3ct0r
Date Posted: 12 April 2022 at 1:06pm
I replaced most of them, i did also test between the case of the output device and the heatsink and it is completely insulated


Posted By: H3ct0r
Date Posted: 12 April 2022 at 2:28pm
I have found his profile but I am unable to PM him, any chance that you would be able to?


Posted By: APW
Date Posted: 12 April 2022 at 2:38pm
you need 10 points before you can PM, 3 or 4 more posts and you will then be good to go.


Posted By: H3ct0r
Date Posted: 12 April 2022 at 2:43pm
ill reply to this in order to stack up some more lol


Posted By: APW
Date Posted: 12 April 2022 at 2:46pm
only a few more to go...


Posted By: H3ct0r
Date Posted: 12 April 2022 at 3:26pm
Let’s hope this one does it 


Posted By: H3ct0r
Date Posted: 12 April 2022 at 3:55pm
Dropped him a PM, hopefully I get a reply



Posted By: simonp1100
Date Posted: 12 April 2022 at 7:38pm
PM sent. Wink



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