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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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DVD/ STEREO SYSTEM: bridge rectifier question
I've just 'fixed' a dvd/amp/stereo all in one made by the world famous
Sunstech :-p ( model hf-dv55m ; manual and details here http://www.sunsiberica.com/productos...tar_producto=5) Unit was dead, on power up some garbled text appeared in the display. measuring o/p voltages on the psu pcb, I saw the display lines were ok but the 5v line was dead. Probing further, I found an o/c cct protector or fusible resistor (marked '3000') in the DC output of one of the bridge rectifiers. I eventually traced the cause to a partially shorted spindle motor. Changed that and the beast works, but I am concerned that the bridge rectifier (marked GW RS202; appearance-wise, its like number 2 in this pic http://arcadecontrols.com/BBBB/bridges.jpg ) gets extremely hot in operation (you can't keep a finger on it at all). Not sure if that is normal; the pcb looks slightly scorched near there, so could have always been this way for all I know. The other identical bridge is pretty much cool in use. So, question is, is this likely to be leaky? I've only ever had one case of a similar leaky rectifier, in a VCR a few years ago. In my experience they normally just short out. Maybe fit a beefier one? Any thoughts welcome. -B |
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