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Old 27th August 2011, 04:34 PM   #1
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Default directed D2400

I replaced 2 of the rail caps in this amp since they were vented..

I checked all power supply fets and outputs all test fine..


When i power it up it goes in and out of proteection over and over...


Any ideas?
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Old 27th August 2011, 07:34 PM   #2
timwebb is offline timwebb  United States
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Location: memphis tn
i just fixed one.i think u might have to check the rectifiers.
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Old 27th August 2011, 07:47 PM   #3
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If you connect the current limiter inline, does it still go in and out of protect?

Is this the amp?
http://ampguts.com/forum/attachments...7b0e65ce4e-jpg

If not, post a photo of the board.
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Old 27th August 2011, 08:11 PM   #4
timwebb is offline timwebb  United States
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this the one i got.
Attached Images
File Type: jpg IMG_20110727_183346.jpg (766.0 KB, 46 views)
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Old 28th August 2011, 05:58 PM   #5
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Its the same board as Tim posted..

If i hook a current limiter in-line it will go in and out of protection also..


If i remove the rectifiers it will power up and idle perfectly for hours
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Old 28th August 2011, 07:46 PM   #6
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Ok somethings not right here..

I get + 80.4 volts of rail

And only -24 volts of rail
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Old 28th August 2011, 09:26 PM   #7
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Do you get the same voltage if you use the negative speaker terminal as the reference?
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Old 29th August 2011, 01:16 AM   #8
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Yes..
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Old 29th August 2011, 01:33 AM   #9
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Assuming that the rectifiers are center tapped, do you see the same voltage swing on the outer legs of both the positive and negative rectifiers?

Do you read 0 ohms between the negative speaker terminal and the secondary center tap of the transformer?
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Old 29th August 2011, 01:44 AM   #10
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ok i replaced 1 of the rectifiers and now i get both + - 71 volts of rail..


Amp still goes in and ot of protection though
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