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Old 13th December 2012, 06:49 AM   #1
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Default Hifonics BXi 2607D

Hello received this amp for repair.

Powered amp, it powered up and did not go into protect, and I have relay engagement.

No audio.

Took amp apart to have a look and the whole power supply was fried!!! How was this amp powering up and getting relay engagement? The blue lights were on and the green light.

One IRF9640 was shorted and took the whole supply. The P/S fets are IRFP064N which are readily available.

The gate resistors look to be 1/4 watt 47 ohm? Most are burned hard to tell!!

2 of the FMU32U were broken off of the board. I cant find any does anyone know where to get them?

D31 a zenner diode was broken does anyone know the value or part number?

I included a few pics of the board and the removed melted parts!!


I have removed all the P/S fets and gate resistors, when power and ground is hooked up and remote applied the amp powers up red protect light goes out, green light comes on and relay engages. How is this amp powering up with the power supply removed????
Attached Images
File Type: jpg TYPE RF and BRUTUS BXi2607D 003.jpg (1,010.9 KB, 112 views)
File Type: jpg TYPE RF and BRUTUS BXi2607D 002.jpg (943.4 KB, 104 views)
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Last edited by seankane; 13th December 2012 at 07:23 AM.
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Old 13th December 2012, 08:37 AM   #2
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The relay and lighting are powered from the primary side of the power supply so you don't need secondary voltage for them to function.

Try dB-r.com for the rectifiers. If you can't find them, you can salvage those by drilling the legs and inserting wires. Don't try just soldering to the legs.

Some amps with the 064s used 22 and some used 47. There should be enough left that measure close to the original value to determine which were used in this amp.

If D31 is in series with D30 and D30 is a 1N4148, D31 is a 39v Zener. It's not critical to the amp's operation so you can test without it.
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Old 13th December 2012, 04:55 PM   #3
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DB-R returned my e-mail and said they do not sell these parts. Well I guess it will be a 10-20 day wait from China.

In the meantime I will receive the IRFP064N in a few days as well as the 1/4 watt 47 ohm gate resistors. I can get those installed, and the 9640's.

I have a brutus BXi 2006D coming tomorrow, maybe I can take the parts out of that and fix this amp and wait on the other amp for the parts to arrive.

Can I replace the Q7, Q8, Q7A, Q8A drivers with the BD139 and BD140 drivers I purchased?
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Old 14th December 2012, 12:50 AM   #4
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I have some fmu32u, let me know if you want a couple.. I run bd139/140's all the time in these things...
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Old 14th December 2012, 05:13 AM   #5
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PM sent!!
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Old 15th December 2012, 01:13 AM   #6
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I had to go to china for them as well.. At the same time I picked up some mospec L60d60d's , these are 60 amp doubles that some of the bigger hifonics used (again, leg breakers..) I ended up gettting the FMU32U's for around 1.25/piece but closer to $2 each after shipping I think.
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Old 15th December 2012, 01:16 AM   #7
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The more frustrating part of the FMU32U parts is trying to even find replacements! I haven't looked in awhile, but finding diodes wired as a "double" is hard enough, and the catch is finding them with the polarity the same way as the FMU32U parts. IXYS makes some big double rectifiers, but the polarity is wrong if I recall.
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Old 15th December 2012, 03:04 AM   #8
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I will research it some more, there has to be a replacement somewhere!!

Anyone feel free to help research......LOL!!
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Old 15th December 2012, 06:47 AM   #9
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To clarify... The term is doubler, not double. Doubler refers to a circuit where you can virtually double the output of a square wave drive signal by driving it into the doubler circuit.

THIS is one datasheet where that type of rectifier is referred to as a doubler.
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Old 15th December 2012, 06:59 AM   #10
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Would these work?

Philips BYU 72 100 Ultra Fast Recovery Double Rectifier Diodes Qty 10 New | eBay
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