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Old 8th January 2009, 03:20 PM   #1
dhole is offline dhole  United Kingdom
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Default cc-x-bosoz dead wtb: matched irf610

Hello All And happy new year!

Ive managed to blow a channel and am trying to fix it. I was rewiring the audio connections as they werent soldered connections. Upon doing this I noticed I had cascoded one channel and left one uncascoded. I thought I would cascode the other channel but then realised I didnt have the irf610's to hand . so I decided to remove the cascode on the other channel. Upon removing the components
( see http://www.diyaudio.com/forums/showt...685#post638685 ) I noticed I had had irf9610 in there ! but it had been working!

so all this is bizzare but upon removing these bits I shorted a 1000uf capacitor too the heatsink of one of the fets I was removing. I think this damaged something as now the channel sucks all the voltage out of the rectified psu It connects to. Im not sure what is bust I just know that when connected and turned on the voltage of 60v drops steadily untilI turn it off! This blew a resistor in the psu and killed a zener, which I replaced.

I would like to get hold of some matched irf610 as these are the more easily damaged parts and the others components look ok and test ok where possable to test.

So If anyone has any matched irf610 ( I only need 2 too fix but may be interested in more ) or any idea of what else the probled might be that would be amazing!

If you read all of this you are a star!!

Dave
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Old 9th January 2009, 12:42 AM   #2
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dhole-

I read your entire post with great interest

Just buy 10 or 15 IRF610's and match them yourself -- it is really not hard, and it sounds like you could use a few spares

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Old 9th January 2009, 07:06 AM   #3
dhole is offline dhole  United Kingdom
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Thanks for reading JJ . Yup I was thinking that as I matched the original ones. Ive ordered 25 pretty cheap. I am gonna replace all the parts slowly as thats the only way I can diagnose myself. What would you do ?
dave
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Old 9th January 2009, 11:27 AM   #4
Magura is offline Magura  Denmark
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Quote:
Originally posted by dhole
Thanks for reading JJ . Yup I was thinking that as I matched the original ones. Ive ordered 25 pretty cheap. I am gonna replace all the parts slowly as thats the only way I can diagnose myself. What would you do ?
dave

Well, I'm not JJ, but the simple solution to find errors, without having to understand the circuit, is to compare the components of the channel that works, by measuring them, with the dead channel.


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Old 9th January 2009, 12:30 PM   #5
dhole is offline dhole  United Kingdom
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true true , only problem when I left it on for 45 seconds it blew a resistor and diode on the psu. I cant have it powered up long enough to measure much...
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Old 9th January 2009, 12:35 PM   #6
Magura is offline Magura  Denmark
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You could start out by measuring with power off, that's actually what I meant in the first place. Then you can compare component values, to some extent, while still in circuit.



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Old 9th January 2009, 12:42 PM   #7
dhole is offline dhole  United Kingdom
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yeah good idea, I have done so with the resistors. The 610 dont show any shorts .How would I test a capacitor?...
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Old 9th January 2009, 12:44 PM   #8
Magura is offline Magura  Denmark
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I bet you, that some of the transistors are dead, if the resistors are ok. Test anything you can test. As you have no idea what's wrong, blanket-testing is the way to go.



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Old 9th January 2009, 12:54 PM   #9
dhole is offline dhole  United Kingdom
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The big question is how did it work with irf9610 in there ?!
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Old 9th January 2009, 01:25 PM   #10
Magura is offline Magura  Denmark
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Quote:
Originally posted by dhole
The big question is how did it work with irf9610 in there ?!

To get the answer to that question, you'll have to draw the circuit as it is. Then I'm sure we can figure that out


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