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Old 12th February 2012, 10:20 AM   #1
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Default rockford fosgate t30001bd

Hi,

My amp stopped working the other week. I diagnosed the fault which was with the PSU. I found 3 mosfets had gone (75344G) which i replaced with 75345G. But yet there still is a fault. I have checked resistors, diodes, mosfets, caps and transisters but cant finder anything else. does anyone have any ideas? Does anyone have a schematic diagram? would very much appreciate it. I miss me bass

thanks in advance
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Old 12th February 2012, 12:02 PM   #2
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Email me for the schematic diagram.

babin_perry@yahoo.com
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Old 12th February 2012, 12:20 PM   #3
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Many thanks!
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Old 12th February 2012, 01:12 PM   #4
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do you think the 75345G instead of the 75344G would be ok? or would it be best sticking to the original ones?
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Old 12th February 2012, 02:01 PM   #5
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Why switch, the 75344 is readily available?
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Old 14th February 2012, 10:56 PM   #6
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i couldnt find any in the UK. Ive replaced the FET's with the 75345G, everything looks ok but when i power it on it make a buzzing sound. Gate resistors are reading ok. The location numbers to the fets that were gone are Q7, Q6 and Q25. Does anyone have any ideas?
Many thanks
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Old 15th February 2012, 10:35 AM   #7
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What are the symptoms (precisely)?
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Old 15th February 2012, 10:55 AM   #8
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the blue power light comes on but there is a very loud buzzing sound. Havent left it on too long, just incase it does too much damage. Im getting 120V on +HV and getting 4V on -HV, should i be getting -120V?
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Old 15th February 2012, 11:22 AM   #9
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How much current is it drawing?

Are you getting more than about 1v across the speaker terminals?
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Old 16th February 2012, 11:40 PM   #10
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ive not had chance to check these yet, but will do over the weekend and post the readings. It makes a buzzing sound when not even connected to the output stage board. Its somewhere on the PSU. Ive ordered the original mofets from the US (ordered them from work so it wont be costing me anything lol). Theres no swollen caps. Before this went on me, occasionally when I switched the head unit on it would make the sub sound a very loud humming sound. It would sometimes do it then go back to normal, then it just completley packed up on me.
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