diode question

mike49504 · 11th November 2008, 01:54 AM

im working on an ads amp and the diodes that were in it were fep16ct and fen16ct i replaced them with u1620 and u1620r are theese the same because now there is no sound out of any of the channels and there was before i replaced all of them because 2 channels didnt work now none work

1moreamp · 11th November 2008, 03:34 AM

The diodes are good, I would check polarity for correct positioning on the board. Try a voltage measurement also...

Perry Babin · 11th November 2008, 03:43 AM

Is it producing rail and regulated voltage?

mike49504 · 11th November 2008, 02:43 PM

not sur if i did it right but on the set of diodes i didnt replace when ap is turned on i put the eter leads on the outer 2 legs of the diode and get a reading of -.68 and the channels work the other diodes theres no reading at all just 000 wondering what could cause this if i put the posistie and negative diodes in wrong spots wouldnt this cause major problems when powerd up

mike49504 · 11th November 2008, 03:09 PM

im thinking 1 of the torriods is shorted when i put my meter on one of the torriod legs and to the irfz44e i get 0 ohms to the middle leg and the gate leg also wondering if this is where my problem might be all other torriods when put on the same leg and to the gate of the irfz44e's i dont get a 000 ohm reading

mike49504 · 11th November 2008, 03:23 PM

ok you guys are probably are gonna think im an idiot which i probably hae to agree i was in a hurry putting this thing back together i was looking at the amp somemore trying to see where the problem is. I put in the mpsa 56 and the 06's in wrong i put the 06's where the 56's go and so on i took them back out and gonna check them to see if they are still good and then put them back in the right order maybe this will solve the prob

1moreamp · 11th November 2008, 03:43 PM

Cool, you figured it out, I hope....

Don't feel bad we all are just human after all....

mike49504 · 11th November 2008, 04:03 PM

ok i put the back in the correct order but i still have a problem when powerd up the outputs get very hot within a few seconds i checked the all and they test fine wondering now where do i go from here what do i check any help would grealt be appericated and thanks for all your help without u guys id be stupid at even uessing where to start

1moreamp · 12th November 2008, 03:38 AM

Mike Pm me about this ADS amp. I will do my best to get you back om track. Then we can post up more here on the open forum...

Iain McNeill · 12th November 2008, 04:20 AM

punctuation is your friend

please help - I find it hard to understand your posts

11th November 2008, 01:54 AM	#1
mike49504 diyAudio Member Join Date: Sep 2006	diode question im working on an ads amp and the diodes that were in it were fep16ct and fen16ct i replaced them with u1620 and u1620r are theese the same because now there is no sound out of any of the channels and there was before i replaced all of them because 2 channels didnt work now none work

11th November 2008, 03:43 AM	#3
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Is it producing rail and regulated voltage? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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11th November 2008, 03:34 AM	#2
1moreamp diyAudio Member Join Date: Dec 2005 Location: Northern California	The diodes are good, I would check polarity for correct positioning on the board. Try a voltage measurement also...

11th November 2008, 02:43 PM	#4
mike49504 diyAudio Member Join Date: Sep 2006	not sur if i did it right but on the set of diodes i didnt replace when ap is turned on i put the eter leads on the outer 2 legs of the diode and get a reading of -.68 and the channels work the other diodes theres no reading at all just 000 wondering what could cause this if i put the posistie and negative diodes in wrong spots wouldnt this cause major problems when powerd up

11th November 2008, 03:09 PM	#5
mike49504 diyAudio Member Join Date: Sep 2006	im thinking 1 of the torriods is shorted when i put my meter on one of the torriod legs and to the irfz44e i get 0 ohms to the middle leg and the gate leg also wondering if this is where my problem might be all other torriods when put on the same leg and to the gate of the irfz44e's i dont get a 000 ohm reading

11th November 2008, 03:23 PM	#6
mike49504 diyAudio Member Join Date: Sep 2006	ok you guys are probably are gonna think im an idiot which i probably hae to agree i was in a hurry putting this thing back together i was looking at the amp somemore trying to see where the problem is. I put in the mpsa 56 and the 06's in wrong i put the 06's where the 56's go and so on i took them back out and gonna check them to see if they are still good and then put them back in the right order maybe this will solve the prob

11th November 2008, 03:43 PM	#7
1moreamp diyAudio Member Join Date: Dec 2005 Location: Northern California	Cool, you figured it out, I hope.... Don't feel bad we all are just human after all....

11th November 2008, 04:03 PM	#8
mike49504 diyAudio Member Join Date: Sep 2006	ok i put the back in the correct order but i still have a problem when powerd up the outputs get very hot within a few seconds i checked the all and they test fine wondering now where do i go from here what do i check any help would grealt be appericated and thanks for all your help without u guys id be stupid at even uessing where to start

12th November 2008, 03:38 AM	#9
1moreamp diyAudio Member Join Date: Dec 2005 Location: Northern California	Mike Pm me about this ADS amp. I will do my best to get you back om track. Then we can post up more here on the open forum...

12th November 2008, 04:20 AM	#10
Iain McNeill diyAudio Moderator Join Date: Oct 2007 Location: Santa Cruz, California	punctuation is your friend please help - I find it hard to understand your posts

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