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Rockford Fosgate 600A4
Rockford Fosgate 600A4
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Old 10th April 2015, 08:48 PM   #1
S Merlington is offline S Merlington  United States
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Join Date: Jun 2012
Default Rockford Fosgate 600A4

1 channel will not bias in this amp..
300 Series parts..

Does anyone happen to know what transistotor to start with since all test good and i dont wanna pul them all ..


Another channel plays somewhat distorted you can barely notice it but you can tell its distorted if you listen..
100series parts..

what 2 diodes do i lift to see if its in the protection circuit ?
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Old 10th April 2015, 08:58 PM   #2
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
Location: Louisiana
D101 and D102.

Confirm that the non-biasing channel clips symmetrically top and bottom with a load.
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Anyone who purchased the repair tutorial, email me (babin_perry@yahoo.com) if you want to download the latest version.
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Old 10th April 2015, 09:04 PM   #3
S Merlington is offline S Merlington  United States
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Join Date: Jun 2012
I also noticed i have 28 volts measured directly across another channel..

400 series parts..

I will put this aside and come back to it later..
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Old 29th August 2015, 06:48 AM   #4
S Merlington is offline S Merlington  United States
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Join Date: Jun 2012
Back to this amp..

1 channel has 28 volts across the speaker terminals ..

All outputs test fine .. Drivers are testing fine also ..

Anyone have and ideas on what would cause 28 volts across the speaker terminals?
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