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Old 17th March 2010, 06:45 AM   #1
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Default Rockford Fosgate 1500bd

Perry,

Dont know what happen to my last Thread cant seem to find it probably overlooked it.

Anyway Ive replaced all of the ic's on the board again. Replaced all of the regulators,resistors for the regulators,all of the outputs, the mic4420's new emitter resistors.

Just finishing up on putting the last 2 ic's back in it.

Wondering is there anything else i should check before i power this up and test the output.

I dont want this thing blowing up for the 5th time
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Old 17th March 2010, 06:51 AM   #2
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Did you check the regulated voltage on the ICs that have been failing?

I hope you're putting the ICs in sockets.
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Old 17th March 2010, 07:13 AM   #3
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DO you mean The + - 15 volts? Or what do i check for on the IC'S
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Old 17th March 2010, 07:24 AM   #4
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Yes. It's ~10v on this amp (don't expect 15v). Set your scope to 2mS, 5v/div and DC coupling. touch it to the power supply pins and push on everything in the area to see if the voltage ever varies from the 10v.

This amp doesn't have any pulldown resistors on the FETs so you should install the opto-coupler before applying power (or desolder the red/black wires on the power supply side of the board <-- this would be best way to prevent damage).

Last edited by Perry Babin; 17th March 2010 at 07:27 AM.
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Old 17th March 2010, 07:35 AM   #5
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I can already see this isnt gonna be simple.

I tryed powering it up and it draws 60 amps of current.

I took the mic 4420's out and it still draws excessive current.

Power supply problem?
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Old 17th March 2010, 07:38 AM   #6
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Can you easily desolder all of the outputs? If so, the amp will produce drive signals and you can check them with no chance of damaging the outputs. I know it's going to be somewhat time consuming but it may be worth it.
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Old 17th March 2010, 07:49 AM   #7
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Ok i unsolderd the outputs and the amp idles fine
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Old 17th March 2010, 07:50 AM   #8
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Reinstall all of the driver components and op-amps. Do you get a clean square wave on all of the gate pads?
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Old 17th March 2010, 08:08 AM   #9
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I will mess with this somemore in the morning i found 2 problems i had 1 output is shorted. And i put U17 in backwards (OPPPSS)
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Old 22nd March 2010, 04:12 AM   #10
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Ok what would u iset me scope to ? To check for the square wave on the gates ? All outputs are taken out
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