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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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Yamaha YST-SW800 active sub help needed
Hi everyone,
I need to get in touch with someone who's familiar with Yamaha's active sub model YST-SW800. Well, this unit features a switchmode powersupply among with a high power class D output stage. It came into my repairshop with blown switching transistors in the primary (2SC4140). Replaced those and powered it up to find a high pitched self-oscillating sound coming out of the unit. Don't know if the sound comes from the smps or the speaker itself. Didn't dare to run it for more than 2-3 seconds in case I blow the switch.transistors again. So I'm looking for any advice regarding what could be the cause of the smps damage, like service bulletins or upgrades, or any explanation why the unit oscillates like it does. Any advice is warmly appreciated, best regards Stefan |
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