MOSFETs in Definitive Technology Pro Sub 1000 Defaced - diyAudio
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Old 19th March 2012, 11:15 PM   #1
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Location: Brooklyn, NY
Angry MOSFETs in Definitive Technology Pro Sub 1000 Defaced

I have never seen this done, hence this post:

I acquired a Definitive Technology ProSub 100 that has stopped working. I opened it up and noticed the POS+ and NEG- strips on the PCB after the caps were burnt open. I corrected that and moved on to the output stage. The FETs were shorted. OK so I just replace those and it'll be good to go.

When I removed the FETs, I noticed they were all defaced . Someone took the time to scratch of the ID numbers on all three components. This unit was never repaired/opened, so it had to have come from the manufacturer like that.

Has anyone ever seen this done at the manufacturing level, or at any level? I will need a schematic to identify these components. If anyone can help that would be awesome.
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Old 20th March 2012, 01:01 AM   #2
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have you tried calling/emailing tech support? I've had companies send me parts no charge before by just asking for the part by the board ID #
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Old 20th March 2012, 01:13 AM   #3
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I did send out an email. Will update if anything comes back.
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Old 20th March 2012, 04:39 AM   #4
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Update: I was able to locate the part numbers. Apparently the Electro-Voice SXA180 subwoofer uses the same output module (DS-300), and I found the schematic here. Works out great.
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Old 30th November 2012, 04:42 AM   #5
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Location: St. Catherine, Jamaica
How is the amp performing? Is it what you expected? How is the sound?

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