Rockford Fosgate T30001BD

mike49504 · 10th March 2010, 09:33 PM

I replaced 8 of the outputs in this amp. Checked the emitter resistors and checked the drivers all seem to test fine.

When i try to power the amp up it draws excessive current. If i unplug the output board and power up just the power supply board it idles fine.

Wondering where i begin to check??

brandes.cm · 10th March 2010, 09:56 PM

Just a thought, after you pull the bad fets powering the amp up before placing good fets in could save some trouble. I have found checking the gate signals prior to populating the output fets has saved me damaging more output fets.

Someone else could tell me if this is logical or not. Sorry it doesn't help your situation right now.

Perry Babin · 10th March 2010, 09:59 PM

Check the driver transistors, diodes and resistors near the small driver transformers. Double-check the outputs also if you find any defective component.

mike49504 · 10th March 2010, 11:45 PM

I checked all drivers,all resistors, and diodes near the small power transformers everything is checking good.

Perry Babin · 11th March 2010, 12:53 AM

Did you check the driver transistors to confirm that every one had 2 good junctions (B-C and B-E)?

You may heed to compare what you read on one half of the outputs to what you read on the other half of the outputs.

mike49504 · 11th March 2010, 10:10 PM

Perry,

Do you know if one of the 3 legged connectors go here or not. Since the wasent one when i got this amp. But it was worked on before

Perry Babin · 10:19 PM

I don't have photos of a 3000 but I think it should be there. Check for continuity between the TC2 component (thermistor) and the 3 pads between Q432 and Q420 on the insulator.

Looking at the ampguts page, it appears that there is one there.
http://diymobileaudio.com/gallery/sh...php?photo=6510

mike49504 · 11th March 2010, 10:24 PM

Thats what I thought that one goes there. The is continuity. Between the pads and tc2

Perry Babin · 11th March 2010, 10:33 PM

The amp will operate without that jumper but that thermistor won't be able to shut down the amp if those transistors get too hot.

mike49504 · 11th March 2010, 11:19 PM

Ok i put a jumper in the amp. But when i try powering it up it goes into thermal mode and drwas excessive current. If i take the board out that i put the jumper on it powers up fine. I checked the outputs i just replaced and also checked the driver for thoose outputs and they all seem to be fine.

Wondering what i should check?

10th March 2010, 09:33 PM	#1
mike49504 diyAudio Member Join Date: Sep 2006	Rockford Fosgate T30001BD I replaced 8 of the outputs in this amp. Checked the emitter resistors and checked the drivers all seem to test fine. When i try to power the amp up it draws excessive current. If i unplug the output board and power up just the power supply board it idles fine. Wondering where i begin to check??

10th March 2010, 09:59 PM	#3
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Check the driver transistors, diodes and resistors near the small driver transformers. Double-check the outputs also if you find any defective component. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

11th March 2010, 12:53 AM	#5
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Did you check the driver transistors to confirm that every one had 2 good junctions (B-C and B-E)? You may heed to compare what you read on one half of the outputs to what you read on the other half of the outputs. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

11th March 2010, 10:16 PM	#7
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	I don't have photos of a 3000 but I think it should be there. Check for continuity between the TC2 component (thermistor) and the 3 pads between Q432 and Q420 on the insulator. Looking at the ampguts page, it appears that there is one there. http://diymobileaudio.com/gallery/sh...php?photo=6510 __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links Last edited by Perry Babin; 11th March 2010 at 10:19 PM.

11th March 2010, 10:33 PM	#9
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	The amp will operate without that jumper but that thermistor won't be able to shut down the amp if those transistors get too hot. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links


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10th March 2010, 09:56 PM	#2
brandes.cm diyAudio Member Join Date: Sep 2009 Location: Wisconsin	Just a thought, after you pull the bad fets powering the amp up before placing good fets in could save some trouble. I have found checking the gate signals prior to populating the output fets has saved me damaging more output fets. Someone else could tell me if this is logical or not. Sorry it doesn't help your situation right now.

10th March 2010, 11:45 PM	#4
mike49504 diyAudio Member Join Date: Sep 2006	I checked all drivers,all resistors, and diodes near the small power transformers everything is checking good.

11th March 2010, 10:24 PM	#8
mike49504 diyAudio Member Join Date: Sep 2006	Thats what I thought that one goes there. The is continuity. Between the pads and tc2

11th March 2010, 11:19 PM	#10
mike49504 diyAudio Member Join Date: Sep 2006	Ok i put a jumper in the amp. But when i try powering it up it goes into thermal mode and drwas excessive current. If i take the board out that i put the jumper on it powers up fine. I checked the outputs i just replaced and also checked the driver for thoose outputs and they all seem to be fine. Wondering what i should check?

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