diamond audio 800.1

timwebb · 18th August 2011, 03:19 AM

i have this amp.the caps blew up.when i power the amp up the rectifiers overheat. what should i be looking for?

Perry Babin · 18th August 2011, 03:44 AM

The first thing you need to do is to clean the area well to remove all of the soot so that you can see the traces in the area. Photograph the traces so that they can be repaired if cut. Then cut away all of the badly burned (and likely conductive) fiberglass. After the conductive material has been removed, then you can begin troubleshooting.

This often happens to amps when the terminals aren't insulated well enough from the board and an arc forms between them.

1moreamp · 18th August 2011, 04:00 PM

Quote:

Originally Posted by timwebb

i have this amp.the caps blew up.when i power the amp up the rectifiers overheat. what should i be looking for?

I agree with Perry, unless you can repair that area of the board that is fried I would consider this one a dead Jim. Looks pretty bad in your picture...

timwebb · 18th August 2011, 07:27 PM

ima give it a shot. i just rebuilt another one the day before. so i have one to go off of. good little amp too it use irfp064n in the power supply.

timwebb · 21st August 2011, 12:45 AM

im inspecting the parts on this amp. the lm317 and lm337are overheating bad.could it be a shorted cap?

Perry Babin · 21st August 2011, 12:50 AM

It could be but it could also be normal. Regulators often have to dissipate a lot of heat under normal operating conditions. Power the other one up to see how hot they run.

timwebb · 21st August 2011, 03:13 AM

ok the lm317 has 56v on pin one.the other one gets as warm as the ones in the working amp.

Perry Babin · 21st August 2011, 03:29 AM

56v is a bit high but probably not too high. How does this compare to the working amp?

timwebb · 21st August 2011, 03:36 AM

the working amp has 31v on the first leg.

Perry Babin · 21st August 2011, 03:48 AM

Has everything else been repaired?

18th August 2011, 03:44 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	The first thing you need to do is to clean the area well to remove all of the soot so that you can see the traces in the area. Photograph the traces so that they can be repaired if cut. Then cut away all of the badly burned (and likely conductive) fiberglass. After the conductive material has been removed, then you can begin troubleshooting. This often happens to amps when the terminals aren't insulated well enough from the board and an arc forms between them. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

21st August 2011, 12:50 AM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	It could be but it could also be normal. Regulators often have to dissipate a lot of heat under normal operating conditions. Power the other one up to see how hot they run. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

21st August 2011, 03:29 AM	#8
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	56v is a bit high but probably not too high. How does this compare to the working amp? __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

21st August 2011, 03:48 AM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Has everything else been repaired? __________________ 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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18th August 2011, 07:27 PM	#4
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	ima give it a shot. i just rebuilt another one the day before. so i have one to go off of. good little amp too it use irfp064n in the power supply.

21st August 2011, 12:45 AM	#5
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	im inspecting the parts on this amp. the lm317 and lm337are overheating bad.could it be a shorted cap?

21st August 2011, 03:13 AM	#7
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	ok the lm317 has 56v on pin one.the other one gets as warm as the ones in the working amp.

21st August 2011, 03:36 AM	#9
timwebb diyAudio Member Join Date: Jan 2010 Location: memphis tn	the working amp has 31v on the first leg.

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