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Old 7th January 2013, 09:51 PM   #1
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Default Rockford Fosgate Type RF X6

I have this amp for repair. Protect light is lit but not real bright.

U21 has no voltage on pin 7. Does this mean U21 is defective?
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Old 7th January 2013, 09:55 PM   #2
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Do you have positive and negative supply voltage on U21?

Do you have rail voltage?
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Old 7th January 2013, 10:00 PM   #3
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Quote:
Originally Posted by Perry Babin View Post
Do you have positive and negative supply voltage on U21?

Do you have rail voltage?
No hardly,

Pin 4: -1.055 vdc
Pin 8: 3.369 vdc

I have only 60 vdc across red and black wires which seems low to me.
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Old 7th January 2013, 10:13 PM   #4
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Are the power supply FETs damaged? Look at the gate and drain waveforms with the scope.
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Old 8th January 2013, 05:35 AM   #5
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The gate and drain signals look terrible, but the FETS do not measure shorted in the circuit.

Im not getting a square wave from the output pins on the SG3526 either.
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Old 8th January 2013, 06:10 AM   #6
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Post a photo of the output signal from the 3526.
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Old 8th January 2013, 06:41 AM   #7
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Here is the pick. Pins 13 and 16 look identical. It seems the amp is only partially powering up. One set of regulators has output the other 2 sets have hardly any. 2 of the rectifiers have 60vdc the other 2 only have 20vdc. I am getting -9.50vdc on alot of the op-amps but only 1-3vdc on the positive side. Only half of the output fets are getting the -9.50vdc and the other half are getting no voltage.
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File Type: jpg sg3526 001.jpg (733.9 KB, 26 views)
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Old 8th January 2013, 06:49 AM   #8
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Post the DC voltage on all pins of the 3526.
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Old 8th January 2013, 06:52 AM   #9
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1: 4.90
2: 1.320
3: 0.595
4: 0.155
5: 1.775
6: 0.001
7: 0.001
8: 1.765
9: 3.610
10: 2.062
11: 0.003
12: 4.80
13: 0.055
14: 13.65
15: 0.001
16: 0.054
17: 13.65
18: 4.90
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Old 8th January 2013, 07:41 AM   #10
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The voltage from the LM339 doesn't look right. Post the voltage on all of its pins.
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