Hifonics BXI 2610D schematic - diyAudio
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Old 13th March 2013, 03:03 AM   #1
Jamie85 is offline Jamie85  Canada
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Default Hifonics BXI 2610D schematic

I'm repairing some power mosfets and I'm getting some funny measurements from the resistors next to the transistors. The amp was smoking and I can't read the resistors anymore. If anyone has a schematic for this amp could you please email it to Jamie.bc@hotmail.com?
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Old 13th March 2013, 05:09 AM   #2
Jamie85 is offline Jamie85  Canada
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The resistors are the ones in a row next to the mosfets. Is it ok to average out a value compared to the other resistors? The mosfets are all the same. Thank you
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Old 13th March 2013, 05:46 AM   #3
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What are the circuit board designations of (at least) a few of them?
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Old 13th March 2013, 05:53 PM   #4
Jamie85 is offline Jamie85  Canada
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All of the resistors have the outer plastic burned off of them except two. Those two are discolored and hard to make out for sure. I measure about 6.4 ohms on all except the 2 of them in question , those are 20 and 28 ohms. The two that aren't as burned look like (brown black black gold) and (yellow brown black gold) but they measure ~6.4 ohms so I'm not sure about the colors. There are some (brown black black gold) on the output side of the amp. I figured those to be 10 ohms if I'm right. Thank you.
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Old 13th March 2013, 07:48 PM   #5
Jamie85 is offline Jamie85  Canada
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Could someone post a close up picture of the power transistors and gate resistors on this amp if you have one? That would probably solve this problem. Thank you
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Old 13th March 2013, 08:05 PM   #6
Jamie85 is offline Jamie85  Canada
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Thank you for your help Perry Babin, I really appreciate it! I have also been talking to a repair shop for hifonics and they said the resistors should be all the same at 47 ohms and that all of the Fets are probably bad even if they test ok. Do you agree? I'll just replace them all cuz they were only $2.50 a piece. If I have this much issues with the fet area should I check anything else before turning the amp back on? Thank you

Last edited by Jamie85; 13th March 2013 at 08:22 PM. Reason: Wrong name
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Old 13th March 2013, 08:21 PM   #7
Jamie85 is offline Jamie85  Canada
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I asked him what else i should check and he said:

"also check the gate driver transistors in the middle of the PCB between the
transformers.
you should check the gate drive with a scope to the power FET's before you
actually install new ones."

What does he mean scope? And could you please tell me how to do this? Thank you.
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Old 13th March 2013, 10:21 PM   #8
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I asked for the circuit board designations because the description that you gave was too vague. With those, I could have told you what you needed to know.

If you haven't done so, read ALL of the basic amp repair page (link in sig line below). it will save a lot of time.

The gate drivers are Q7, 7a, 8 and 8a. It's fairly common for Q8 and 8a to fail when the power supply FETs fail.

He meant check the signals with an oscilloscope.
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Old 14th March 2013, 06:41 AM   #9
Jamie85 is offline Jamie85  Canada
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Ok I read the amp repair page. I removed Q7A and I'm trying to test it but I can't find a data sheet with c3228 on it. Is it easier to test it in the circuit?

I tested the transistor and I'm still not sure if they're ok. I may have been able to figure it out if I could find the right data sheet. Could you please tell me if this sounds ok for measurements outside of circuit?

Pin 1-2 OL
Pin 2-1 OL

Pin1-3 OL
Pin 3-1 a seemingly descending 21.4m ohms (it starts at over 22m and slows around 21.4m

Pin 2-3 OL
Pin 3-2 another descending number ending at about 19.5m ohms

Hopefully this is enough information.

Thanks again for your help
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Old 14th March 2013, 07:26 AM   #10
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Go back and find the section header:
Transistor Failure/Checking Transistors:

There are two links that will help you learn to check transistors.

http://oldwww.kec.co.kr/data/databoo...ng/Ktc3228.pdf
http://oldwww.kec.co.kr/data/databoo...ng/KTA1275.pdf
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