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Old 13th February 2013, 09:59 AM   #11
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I'm working from a schematic diagram that I assumed was the same (or close enough). Contact Rockford to get the correct schematic diagram and email me a copy of it.

babin_perry@yahoo.com
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Old 14th February 2013, 12:21 PM   #12
Witwe is offline Witwe  Germany
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Hi Perry,

did you get my email?

Rockford told me that the PC3095-B is the same as the PC3095-A.
They send me the schematic I have attached.

I'm wondering that the rear right channel should be the 4xx components.
my rear right channel uses the 3xx components....

http://www.soelkweiler.de/RoFo/H18004_PC-3095A-1.pdf
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Old 14th February 2013, 12:31 PM   #13
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My internet connection has been down most of the night.

The numbers are the same as the diagram that I had. Those are the only 3 transistors that I see that can cause the amp to clip the bottom half of the waveform if the amp produces clean audio up to clipping with a load when D302 is out of the circuit. Confirm that all of the resistors in that part of the circuit are within tolerance.
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Old 14th February 2013, 06:00 PM   #14
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I have had many Rockford amps with the problem you are having, caused by a bad SMD resistor.

Check all the ones in that circuit, if you find one way off remove it from the circuit and test it to be sure. You will find it.
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Old 14th February 2013, 07:10 PM   #15
Witwe is offline Witwe  Germany
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thank you, I will test it out tomorrow and Keep you informed
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Old 20th February 2013, 05:10 PM   #16
Witwe is offline Witwe  Germany
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I found out that R338, a 10Ohm resistor, was also open.
But even after changing it, the problem is still the same
I have checked many other resistors (measured in circuit) and compared it with the resistors from the front channel.
I can't find any other resistor with wrong values.
The only strange thing is R340. it should be 91k Ohm and that is exactly what my multimeter told me.
But R140, R240 and R440 shows me only 44k Ohm. (all measured in circuit)
Can this help to find the defective parts?
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Old 20th February 2013, 05:37 PM   #17
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Compare R341. 342 and 343 to the corresponding resistors in other channels.
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Old 21st February 2013, 06:04 AM   #18
Witwe is offline Witwe  Germany
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R341 - 1000Ohm
R342 - 999Ohm
R343 - 39,5k Ohm

R141 - 994Ohm
R142 - 995Ohm
R143 - 30,5k Ohm (same as R243 and R443)
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Old 21st February 2013, 03:35 PM   #19
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When you set your scope to 5v/div and touch the probe to the positive output terminal of your power supply, does the trace deflect up approximately 2.5 divisions?
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Old 21st February 2013, 05:59 PM   #20
Witwe is offline Witwe  Germany
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Sorry for my confusion, but what positive output terminal do you mean?
the powersupply of this channel?
can you tell me where to grab it?
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