Live Webcast: Preparing for ISO 26262 Version 2

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LIVE EVENT:
Preparing for ISO 26262 Version 2
August 13, 2019 11:00 AM EDT
Automotive Safety
Sponsored by:

dSPACE, GrammaTech

REGISTER NOW
ISO 26262 has become the de facto development standard for safety-critical automotive electronics. With version 2 of the standard set for publication, vendors across the automotive supply chain must be prepared to address new nomenclature and areas of the standard that could potentially impact engineering efforts. Tune in to this Automotive webcast with industry experts and learn more.
Sponsors:
dSPACE, GrammaTech
Moderator:
Curt Schwaderer, OpenSystems Media
REGISTER NOW

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Subwoofer Repair

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By  Jestine Yong  on December 3, 2013   A customer brought this powered speaker for repair. It is a Wharfedale Titan 12’ subwoofer Amplifier. The complaint: No power. I opened the unit checking the usual things such as the fuse, EMI filter coils, voltage on filter caps etc. These all checked out fine, and I measured 320VDC over the two filter caps. The unit uses a SMPS. The smps and class-D Amplifier, are both on the same board. I then connected my analog meter to one of the secondary output lines going to the amplifier. There was no voltage here, and nothing on any of the other output lines going to the pre-amp board. I then proceeded to check if it is a shutdown problem, by switching the unit on and watching to see if the needle on my analog meter jumps up for a brief moment. No movement at all. This made me believe I have a primary –side fault. I checked the two, main switching Mosfets  and they were good. From the below photo you can ...
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