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Rockford Fosgate Punch 100x2
Rockford Fosgate Punch 100x2
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Old 3rd November 2013, 12:25 AM   #1
nikb47 is offline nikb47  United States
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Join Date: Oct 2013
Location: idaho
Default Rockford Fosgate Punch 100x2

Putting out 31.3v on right channel.

Measured outputs with black on leg 3
Q225
Leg 1 0v
Leg 2 .06v
Q215
Leg 1 0v
Leg 2 .06v
Q219
Leg 1 62.5v
Leg 2 0v
Q224
Leg 1 -62.5v
Leg 2 0v

Then measured with black on chassis ground
Q225
Leg1 -31.3
Leg2 -31.2
Leg3 -31.2
Q215 same as q225

Q219
Leg1 31.2
Leg2 -31.2
Leg3 30.6
Q224 same as q219.

What do I do next thanks in advance.
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Old 3rd November 2013, 04:06 AM   #2
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
Location: Louisiana
Check the readings. Something isn't right.

First numbers, 219 and 224 should have the same voltages.

Second set of numbers. 219 and 224 have almost identical voltages but they were 60+v apart in the first numbers.

Do you read anything near 0 ohms between the legs of any individual output transistors (no power applied)?
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Old 3rd November 2013, 04:57 AM   #3
nikb47 is offline nikb47  United States
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Join Date: Oct 2013
Location: idaho
Changed q215 and q225
Now getting

Q215
L1 -27.4
L2 0
L3 -30.5
Q225 same

Q219
L1 27.3
L2 0
L3 30.5
Q224 same

But now putting out .065dcv how do I bring that number down?

Oh and I bought your tutorial earlier today, Perry. Thank you! Tons of info!!!

Skimming through it right now!
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Old 3rd November 2013, 05:01 AM   #4
nikb47 is offline nikb47  United States
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Join Date: Oct 2013
Location: idaho
Also I want to add that it seems like the output transistors are heating up very quickly!
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Old 3rd November 2013, 05:04 AM   #5
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
Location: Louisiana
With all of the transistors clamped down, set the bias. The DC offset may drop. If it doesn't, I'd leave it as is. Getting it down could be as simple as replacing a couple of transistors but could be much more difficult to resolve. 0.065 is a bit high but will not cause any problems.

Is there a reason you didn't choose the download option for the tutorial?
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Old 3rd November 2013, 05:07 AM   #6
nikb47 is offline nikb47  United States
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Location: idaho
I did download it. Im looking through it right now! Must have taken you years to put all of the info together!
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Old 3rd November 2013, 05:11 AM   #7
Perry Babin is offline Perry Babin  United States
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Location: Louisiana
I must have misread the notice.

Yes, years, especially for the various examples. Don't forget the files in the 'miscellaneousstuff' folder. Read the page 'Images and Notes for Other Amplifiers' in the directory very carefully to get the most from those pages.
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Old 3rd November 2013, 05:15 AM   #8
nikb47 is offline nikb47  United States
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Join Date: Oct 2013
Location: idaho
Ok sounds good. Im working on that ppi a404.2 right now. Actually waiting for parts right now. But I figured I could read through some of your usefull info while I wait. Any special sections to pay attention to for that amp?
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Old 3rd November 2013, 05:19 AM   #9
Perry Babin is offline Perry Babin  United States
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Join Date: Nov 2003
Location: Louisiana
I don't have anything specifically on that amp. Any help would be generic. Navigate to the following page in the tutorial and read all that is there.

repair_tutorial/miscellaneousstuff/ppi/repairnotesprecisionpower.htm
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Old 3rd November 2013, 11:43 PM   #10
nikb47 is offline nikb47  United States
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Hey Perry,

I let the 100x2 idle for about 1 hour and it got HOT! only on the right side by the output transistors. Do you know what could be the cause or what I can check? Thanks
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