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Old 2nd March 2013, 04:36 PM   #11
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Perry the protect LED stays on for about 2-3 seconds. During this period the speaker terminal voltage reads 0.000v and once the protect LED light goes off the voltage starts to slowly climb. I also, just notice that the resistor on R44 gets extremely hot but can't remember if it is suspposed to be that hot or no.
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Old 2nd March 2013, 05:30 PM   #12
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R44 normally runs pretty hot.
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Old 2nd March 2013, 08:10 PM   #13
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Do you have a pot (10k ohms or greater) that you can wire as shown in the following images?
Attached Images
File Type: jpg IMG_0160b.jpg (122.2 KB, 74 views)
File Type: jpg IMG_0163b.jpg (195.5 KB, 72 views)
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Old 2nd March 2013, 10:19 PM   #14
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Yes... what is the purpose of attaching the pot to this chip. What is the function of this chip?
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Old 2nd March 2013, 10:31 PM   #15
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This chip monitors the output and drives the outputs (or actually the drive circuit which in-turn drives the outputs) so that there is no (or very little) distortion in the output signal.

In the photo, you can see that R35 and R31 have been disconnected. You can leave R35 but you need to slide R31 from its pads.

What you will need to do is rotate the pot from about the 10 o'clock position to the 2 o'clock position to make the output of the output of U17 toggle from 9v to -9v. Go through the 12 o'clock position quickly. Sometimes, if you go through it slowly, it can damage the outputs. Try not to go below the 9 o'clock or above the 3 o'clock positions.

First, confirm that pin 6 is toggling as it should when you go from 10 to 2.

The pot needs to be at least 4.7k ohms. A 10k is better. Anything up to 100k should work.
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Old 3rd March 2013, 03:17 AM   #16
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Perry,

all i had was a 20k pot like the ones used for the crossover. I wired it like the picture and powered the unit up. i checked the output on pin 6 and it was reading 8.68v with 123v on the speaker terminal. When i turned the pot from 10 o'clock to 2 o'clock the reading changed to a -8.08v.
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Old 3rd March 2013, 03:34 AM   #17
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Where was the -8v? on the speaker terminals or on pin 6?

If on pin 6, did the voltage on the outputs go to approximately negative 120v?
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Old 3rd March 2013, 07:00 AM   #18
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Yes the voltage was on pin 6 and yes the outputs went to -131v
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Old 3rd March 2013, 02:15 PM   #19
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That seems to indicate that the drive circuit is OK. I'd suggest replacing U17. Don't forget to reinstall R31.

If you work on these amps often, you will find this test useful.
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Old 3rd March 2013, 05:27 PM   #20
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Perry i will replace U17 and seem if that fixes the voltage on the speaker terminals. I have about 26 more rockford amps to fix in my spare time. Just wondering if you own your shop, if so how do you find time to help everyone with there repairs? You definitely love what you do.
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