Rockford fosgate power 500bd in protect - diyAudio
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Old 25th February 2013, 11:01 PM   #1
chipper is offline chipper  United States
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Red face 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.
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Old 25th February 2013, 11:02 PM   #2
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U21 is likely defective. Post the voltage on all 8 pins.
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Old 25th February 2013, 11:10 PM   #3
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Here's a pic
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Old 26th February 2013, 02:05 AM   #4
chipper is offline chipper  United States
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Quote:
Originally Posted by Perry Babin View Post
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
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Old 26th February 2013, 04:25 AM   #5
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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.
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Old 26th February 2013, 04:39 AM   #6
chipper is offline chipper  United States
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Quote:
Originally Posted by seankane View Post
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.
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Old 26th February 2013, 04:41 AM   #7
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Btw what do you do or how do you remove those small ICs? It's a fairly small chip.
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Old 26th February 2013, 04:42 AM   #8
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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.
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Old 26th February 2013, 04:44 AM   #9
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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.
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Old 26th February 2013, 05:09 AM   #10
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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.
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