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Old 14th March 2013, 02:46 AM   #1
skyeyes is offline skyeyes  United States
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Default Brutus 2408D part identification:

Perry and any other of the Guru's here. Can you help me with some parts identifications and any other suggestions to go along with repairing this amp please.

R62 - ?
Q7 - C3228
Q8 - A1275
R61 - ?
R62A - ?
C219D - ?
R61A - ?
Q8A - A1275
Q7A - C3228

I also decided to replace all the DNP outputs and all the IRF's.
Are there any other suggestions as to anything else that may have shorted, opened or create issues. Thanks for the help..
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Old 14th March 2013, 04:20 AM   #2
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I don't have anything on that amp specifically but it's likely similar to the other amps.

R61/61a = 470
R62/62a = 3.3k
C219D = 1uF 5% 100v
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Old 14th March 2013, 03:37 PM   #3
skyeyes is offline skyeyes  United States
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Thanks a bunch Perry! You're a lifesaver on this forum. Keep up the good work!
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Old 15th March 2013, 02:37 AM   #4
skyeyes is offline skyeyes  United States
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OK, Perry I am stumped here.
I replaced all my IRF064's (fets) and decided to bench test the amp without the output transistors (DPN's) in it. The amp kicked on,, relay engaged and draws about 1-2 amps of current. So I decided to install the output transistors. Once I turn it on, it immediately draws about 20amps of current and the output transistors get very hot. Have to shut it down almost immediately to prevent burning it up. Any ideas as to what could be the cause? Forgot to mention it is a BXI2408 Brutus.
Any help would be appreciated. Thanks
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Old 15th March 2013, 02:47 AM   #5
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Post a photo of the audio driver board in the amp.

What is the exact part number on the output transistors?
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Old 15th March 2013, 04:24 AM   #6
skyeyes is offline skyeyes  United States
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Ok, Here is what I found so far:
Q226 was open, so I had to replace it.
The output transistors are: DFP70N06.
What has me puzzled is the on Q288 I have -081.5 vcc's on the two outer legs and +14.45 volts on the middle. ( see pics). I pulled the resistor also to see where it was coming from.
Also on the output transistors i have negative voltage on the 2 outer legs. ( I ended pulling out all the outputs to troubleshoot the amp.)
Forgot to say that I tested the 2 transistors on the audio board and they were good. Seems to be the issue in some cases, but I dont think it is in this one.
Attached Images
File Type: jpg Board1.jpg (241.3 KB, 51 views)
File Type: jpg Board2.jpg (225.6 KB, 49 views)
File Type: jpg Q226.jpg (98.4 KB, 49 views)
File Type: jpg Q288.jpg (279.7 KB, 46 views)

Last edited by skyeyes; 15th March 2013 at 04:27 AM.
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Old 15th March 2013, 11:55 PM   #7
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Why does the voltage on Q288 concern you? It seems to be about right.

Half of the outputs are supposed to have negative rail on their gate and source legs. In operation, the gate leg of those outputs will have approximately 5v over the negative rail voltage.

Were any of the output transistors defective when you checked them out of the board?
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Old 16th March 2013, 12:22 AM   #8
skyeyes is offline skyeyes  United States
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no, they were not. I just checked them all.
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Old 16th March 2013, 12:53 AM   #9
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The two transistors in the rectangle in the attached image commonly fail. If you have to order them also order replacements for the other smaller transistors and the op-amps.

The transistors are:
1D = MMBTA42
2D = MMBTA92
Attached Images
File Type: jpg bxi2006daudiodriverboard01b2x.jpg (108.4 KB, 40 views)
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Old 16th March 2013, 03:58 AM   #10
skyeyes is offline skyeyes  United States
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Im posting this picture. Do these voltages look correct to you.?
Attached Images
File Type: jpg 3-15-2013 10-43-04 PM.jpg (126.5 KB, 25 views)
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