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Old 2nd August 2011, 11:33 PM   #1
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Default Rockford fosgate BD1500.1

I got this in for repair and when i recieved the amp in it was still to hot to touch..

I replaced all of the outputs and checked the MIC4420's ..

If i unsolder the red/black twisted wires ap will power up and idle fine..

If i solder the wires back in the amp draws 60 amps of current..

Any ideas??
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Old 3rd August 2011, 01:32 AM   #2
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Ok All of the outputs are taken out right now..

If i unsolder both sets of red/black twisted wires amp powers up and idles about 3 amps..


If i leave the outputs out of the amp and solder 1 set of the twisted wires back to the board the amp draws 60 amps of current..

Any ideas what might cause this?
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Old 3rd August 2011, 01:41 AM   #3
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Assuming that there is nothing wrong with the drive circuit for the power supply FETs, solder bridges on the output pads, defective rectifier, shorted/leaky rail caps, having the red/black wires reversed...
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Old 3rd August 2011, 01:45 AM   #4
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Let me take a pic of the waveform for the power supply fets
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Old 3rd August 2011, 02:15 AM   #5
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OK there are 2 sets of rectifiers i lifted the first set and the current draw went away .. But they test fine out of circuit..

Should i replace them and see if the current draw returns??

Last edited by mike49504; 3rd August 2011 at 02:17 AM.
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Old 3rd August 2011, 02:19 AM   #6
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Did the amp produce rail voltage across both sets of red and black wires?
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Old 3rd August 2011, 02:51 AM   #7
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first set 149.6 volts

Second set of twisted wires -156.9


If i lift the rectifiers amp powers up perfectly if i solder them back in it draws excessive current
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Old 3rd August 2011, 07:20 AM   #8
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If you look at the markings on the board on the end of the black and red wires nearest to the power supply FETs and place the black probe on the point marked -HV and the red probe on the point that's marked +HV that one reads positive and the other reads negative?
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Old 3rd August 2011, 03:14 PM   #9
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Correct
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Old 3rd August 2011, 04:10 PM   #10
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Try it again with the red and black wires disconnected on the end nearest the power supply FETs.
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