Rockford fosgate power 500bd in protect

chipper · 25th February 2013, 11:01 PM

Hello everyone I just in for my own collection a rockford fosgate power 500bd. It's in protect (red light on) I checked the output fets (IRF540 & IRF9540) they all test out fine no shorts. If I can get a lil more detailed help on this one that would be cool. I've never had BD series power amp nor have I ever touched one. This is my first time.

This is PC-3066-F board.

Perry Babin · 25th February 2013, 11:02 PM

U21 is likely defective. Post the voltage on all 8 pins.

chipper · 25th February 2013, 11:10 PM

Here's a pic

chipper · 26th February 2013, 02:05 AM

Quote:

Originally Posted by Perry Babin

U21 is likely defective. Post the voltage on all 8 pins.

I can't do any voltage testing right now until my dad gets home so I can use his meter. Is Q15 & Q16 suppose to run a little above warm?

May I ask if the outputs aren't shorted then what is making this amp go into protect? And what does U21 do or control?? Thanks

seankane · 26th February 2013, 04:25 AM

Dont have schematic in front of me but Q15 and Q16 are regulators and yes they run hot...totally normal.

I always check the solder joints on those as well since they run so hot.

If U21 is defective the amp will remain in protect. Take one out of your parts boards and throw it in since its your own amp. You can always order new ones and put it in later??

Its a TL072C pretty common op-amp.

chipper · 26th February 2013, 04:39 AM

Quote:

Originally Posted by seankane

Dont have schematic in front of me but Q15 and Q16 are regulators and yes they run hot...totally normal.

I always check the solder joints on those as well since they run so hot.

If U21 is defective the amp will remain in protect. Take one out of your parts boards and throw it in since its your own amp. You can always order new ones and put it in later??

Its a TL072C pretty common op-amp.

Alright just thought maybe those where the culprits.

I have a couple parts boards that have those if it works then ill order new ones for extra reliability. I just have to buy some more desolder braid and see what happens.

chipper · 26th February 2013, 04:41 AM

Btw what do you do or how do you remove those small ICs? It's a fairly small chip.

seankane · 26th February 2013, 04:42 AM

You need to purchase chipquik. The stuff is amazing at removing various components without damaging vias or solder pads.

Perry turned me onto it. You should also think of investing a hot air
rework station. I have not yet, but I do have a heat gun used for removing.

seankane · 26th February 2013, 04:44 AM

If you dont have either, use solder.

Heat both sides of the op-amp and apply solder generously back and forth till the chip loosens.

You can suck any extra off with a desoldering tool.

Perry Babin · 26th February 2013, 05:09 AM

I resisted buying a hot air station for a long time due to the limited need and the cost. When I found that they've dropped to $60, I picked one up. I rarely use it (even for SMD components) but it occasionally comes in handy.

25th February 2013, 11:01 PM	#1
chipper diyAudio Member Join Date: Oct 2008 Location: Los Angeles	Rockford fosgate power 500bd in protect Hello everyone I just in for my own collection a rockford fosgate power 500bd. It's in protect (red light on) I checked the output fets (IRF540 & IRF9540) they all test out fine no shorts. If I can get a lil more detailed help on this one that would be cool. I've never had BD series power amp nor have I ever touched one. This is my first time. This is PC-3066-F board. __________________ Feel the PUNCH

25th February 2013, 11:02 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	U21 is likely defective. Post the voltage on all 8 pins. __________________ Links >> Basic Car Audio Amp Repair * Basic Car Audio Electronics * New Site * Basic Switching Power Supply Design * Basic Computer Skills << Links

26th February 2013, 04:25 AM	#5
seankane diyAudio Member Join Date: May 2010 Location: Washington State	Dont have schematic in front of me but Q15 and Q16 are regulators and yes they run hot...totally normal. I always check the solder joints on those as well since they run so hot. If U21 is defective the amp will remain in protect. Take one out of your parts boards and throw it in since its your own amp. You can always order new ones and put it in later?? Its a TL072C pretty common op-amp. __________________ Pyramid 52 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch

26th February 2013, 04:41 AM	#7
chipper diyAudio Member Join Date: Oct 2008 Location: Los Angeles	Btw what do you do or how do you remove those small ICs? It's a fairly small chip. __________________ Feel the PUNCH

26th February 2013, 04:42 AM	#8
seankane diyAudio Member Join Date: May 2010 Location: Washington State	You need to purchase chipquik. The stuff is amazing at removing various components without damaging vias or solder pads. Perry turned me onto it. You should also think of investing a hot air rework station. I have not yet, but I do have a heat gun used for removing. __________________ Pyramid 52 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch


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26th February 2013, 04:44 AM	#9
seankane diyAudio Member Join Date: May 2010 Location: Washington State	If you dont have either, use solder. Heat both sides of the op-amp and apply solder generously back and forth till the chip loosens. You can suck any extra off with a desoldering tool. __________________ Pyramid 52 Amp Power Supply----Fluke 787 Processmeter----Tektronix 465 Scope----Velleman HPS40 Scope----Soldering Iron----Desoldering Iron----Hejet HJ 500-S Heatgun----DM4070 Digital LCR Meter----Propane Torch

26th February 2013, 05:09 AM	#10
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	I resisted buying a hot air station for a long time due to the limited need and the cost. When I found that they've dropped to $60, I picked one up. I rarely use it (even for SMD components) but it occasionally comes in handy. __________________ 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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