R1, R44 burning up- ax-100

audiodan · 28th May 2009, 10:26 PM

Help

Ive just changed the position of the output fets( grouped them correctly) on the heatsink and restarted.

Now output resistors are smoking (R1, R44)

This aleph-x was working fine and no other changes were made except for position of the irfp240s.

Anyone enlighten me what could have gone wrong.?
my guess is broken fet but a quick measure reads correct on multimeter.

Nelson Pass · 29th May 2009, 01:01 AM

Could be disconnected Gates.

Blues · 29th May 2009, 01:28 AM

Could be shorted Drain(s) to heatsink...

audiodan · 29th May 2009, 02:09 AM

Thanks for the quick response Nelson and Blues!

But... Ive just checked both the gates to board which are good and also Drain to heatsink which is also good.

Ive just swapped the other board in there and getting same problem, so its either fet or power supply.

this might keep me working late into the night, lucky Im off for the weekend, long weekend, just hope I dont try to solve it to much in my head over the next few days.

Or it could be incorrect connection to board.

mmmmmmmm

audiodan · 2nd June 2009, 12:01 AM

Well Ive found the problem

Lets hope its the only one.

Somehow I destroyed 3 of 4 of my lovely balanced IRF9610.

weekend break was what I needed.

audiodan · 2nd June 2009, 02:05 AM

In fact all the rest of my batch of IRF9610 are toast except one, these little guys must be very sensitive, good lesson to learn, I was very blarsay with handling them.

28th May 2009, 10:26 PM	#1
audiodan diyAudio Member Join Date: May 2008	R1, R44 burning up- ax-100 Help Ive just changed the position of the output fets( grouped them correctly) on the heatsink and restarted. Now output resistors are smoking (R1, R44) This aleph-x was working fine and no other changes were made except for position of the irfp240s. Anyone enlighten me what could have gone wrong.? my guess is broken fet but a quick measure reads correct on multimeter.

29th May 2009, 01:28 AM	#3
Blues Lightning In A Bottle diyAudio Member Join Date: Sep 2003 Location: Bremerton, WA	Could be shorted Drain(s) to heatsink... __________________ Quad Matched Toshiba 2SK1530/2SJ201 MOSFETs http://www.diyaudio.com/forums/swap-...ml#post2086375

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29th May 2009, 01:01 AM	#2
Nelson Pass The one and only Join Date: Mar 2001	Could be disconnected Gates.

29th May 2009, 02:09 AM	#4
audiodan diyAudio Member Join Date: May 2008	Thanks for the quick response Nelson and Blues! But... Ive just checked both the gates to board which are good and also Drain to heatsink which is also good. Ive just swapped the other board in there and getting same problem, so its either fet or power supply. this might keep me working late into the night, lucky Im off for the weekend, long weekend, just hope I dont try to solve it to much in my head over the next few days. Or it could be incorrect connection to board. mmmmmmmm

2nd June 2009, 12:01 AM	#5
audiodan diyAudio Member Join Date: May 2008	Well Ive found the problem Lets hope its the only one. Somehow I destroyed 3 of 4 of my lovely balanced IRF9610. weekend break was what I needed.

2nd June 2009, 02:05 AM	#6
audiodan diyAudio Member Join Date: May 2008	In fact all the rest of my batch of IRF9610 are toast except one, these little guys must be very sensitive, good lesson to learn, I was very blarsay with handling them.

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