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Old 14th August 2013, 01:31 AM   #1
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Default Brutus BXI2006

Got a Brutus BXI2006 (Hi Fonics) with blown power supply and shorted outputs.

If in getting 12v and 3.3v at the pads(power supply) do I still need to replace the driver trannies?
If so are these located in Q07 and Q08? there appears to be 2 of each, Im assuming 1 set for each back.

I also noticed this amp uses all IRF640's with no 9640's

From reading the other posts about this amp I can use IRF3205's instead of the DFP units.
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Old 14th August 2013, 01:44 AM   #2
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3.3v seems low. What's the voltage on pins 9 and 10 of the KA7500 IC?

Q7, Q8, Q7A and Q8A are the driver transistors for the power supply FETs.
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Old 15th August 2013, 04:17 PM   #3
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Ok Im getting 4.44v on the KA7500 so I will have to change the driver transitors.
Is there anything else that could cause the drop in voltage?
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Old 15th August 2013, 10:49 PM   #4
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Order the BD139 and the BD140 for the drivers.

The MMBTA42s and MMBTA92s on the audio driver board sometimes fail.
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Old 30th August 2013, 12:44 AM   #5
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I have the BD139's and BD140's still waiting on then outputs, the BD's are a different package type so do you mount them with the numbers facing the same way as the originals? or do i have to turn them around?

Also purchased a BK 2120 scope now i just need a waveform to test.
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Old 30th August 2013, 12:55 AM   #6
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They face the same direction.

Index of /temp/test tones
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Old 9th September 2013, 09:01 PM   #7
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Well finally got all the new parts installed and hook it up and soon as the relay clicks i get a noise coming through the speaker that is kinda hard to describe, its a steady noise with a little white noise in it. any ideas?
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Old 9th September 2013, 09:24 PM   #8
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Do you get noise with no RCAs plugged in?

What is the rail voltage in the amp?
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Old 9th September 2013, 11:55 PM   #9
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No I had audio playing through into it.

Where would I place the probes to measure rail voltage?
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Old 10th September 2013, 12:42 AM   #10
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To clarify... With no RCAs plugged in, there is no noise?

You can check the rail voltage on the metal tabs of D32 and D33.
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