Kicker ZX300.1 going into Protect mode, I need help - Page 2 - diyAudio
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Old 13th August 2012, 11:58 PM   #11
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Join Date: Apr 2012
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Perry, I hope that these are to your liking.

Click the image to open in full size.

Click the image to open in full size.

Q6 removed - powers up without going into protect

Q6 replaced & Q9 removed - goes into protect mode.

I have more pictures of this board at this quality if you would like them. I can email them to you or you can download them off of my photobucket account. I have not uploaded them all yet though.
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Old 14th August 2012, 12:05 AM   #12
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Join Date: Nov 2003
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What does the base (center leg) of Q6 go to? If it goes to a resistor, follow the circuit beyond the resistor.

Those photos are much better. I'll ask for them as needed.
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Old 14th August 2012, 12:44 AM   #13
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It goes through R20 and into the collector (right leg) of Q5 (2N 4403)
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Old 14th August 2012, 01:09 AM   #14
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Remove and check Q5 carefully. Check for leakage as well and checking for two good junctions.
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Old 14th August 2012, 01:57 AM   #15
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Q5 checks out OK, I could not find any leakage between any combination of legs.

The base of Q5 goes through R15 and into J36. The other end of J36 connects to the collector of Q115

Here is a picture of Q115

Click the image to open in full size.
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Old 14th August 2012, 11:03 PM   #16
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With Q6 in the circuit and either of the two transistors mentioned above out of the circuit, does it power up normally?
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Old 15th August 2012, 11:44 AM   #17
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With Q5 out it will power up fine, I will put Q5 back in and remove Q115 and check.
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Old 17th August 2012, 12:14 PM   #18
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I followed your direction and kept going "down" the traces removing and testing transistors that were in line. I found a MPS A92 (Q114) that has a leak or short between the emitter and collector. I am in the process of obtaining a replacement. Once I have it back in I will test again to see if it will power up without going into protect mode.

Thanks for the help
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Old 27th August 2012, 01:09 AM   #19
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OK, I finally was able to free up some time and put a new transistor in. The amp powered up without going into protect mode and has output. So I put it all back together for more testing.
I currently have it hooked to be put under strain (installed in my car). So far all is well.
Thanks for the help Perry, you are a blessing.

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