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Old 17th February 2010, 03:43 PM   #1
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Default Rockford Fosgate 801s

I got this amp in this morning for repair. The guy said he hit the heatsink with the power wire and now his sub sticks all the way out when connected.

So i was think it had dc on the outputs. With the outputs in the amp they read shorted. I took the outputs out in the left channel and off the board they all test fine.

I then checked the resistors (51 ohms) they all test fine.

Then i checked the drivers a56 and 06's all test fine.

Problem im having is theres no dc on the outputs but the left channl has low output and is distorted.

Wondering what might cause this
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Old 17th February 2010, 04:30 PM   #2
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Is the right channel working properly?
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Old 17th February 2010, 04:50 PM   #3
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Right channel works perfect
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Old 17th February 2010, 07:00 PM   #4
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Have you tried disabling the protection circuits to see if the waveform comes back?
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Old 17th February 2010, 07:26 PM   #5
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Do you know what 2 diodes i have to pull in order to disable the protection circuit to see if i can get it to work?
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Old 17th February 2010, 07:43 PM   #6
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D202 and D205. Remove one, check audio, then remove the other.

Did you get your scope back?
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Old 17th February 2010, 08:17 PM   #7
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didnt get it back yet i dont know what the heck he is doing
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Old 17th February 2010, 08:25 PM   #8
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I removed d202 and 205 still have the same problem low output and distorted on left channel
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Old 17th February 2010, 08:56 PM   #9
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Do you have rail voltage on leg 3 of all of the outputs in the defective channel?
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Old 17th February 2010, 11:15 PM   #10
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Yes i have voltage on the 3rd legs of all the outputs 9640's and 640's

I compared the voltages to the right channel and they are the same
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