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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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sony STR-D965 blown R channel
Ok the front panel was dead, had 2 fuses blown, and the MN2488 and MP1620
was shorted in the right channel. the rest was fine. Well, i replaced both fuses, replaced both outputs and the 2 10ohm base resistors. I checked every other resistors and found things to be normal. i replaced a high ESR 47uf cap also. there was a small PNP transistor near the 2 outputs that was shorted also, replaced that. The set now turns on and works, except as soon as I hook a speaker up to the right channel output, it goes into protector. i checked and double checked the resistors in the output circuit. If i leave the speaker unhooked, its fine. there is NO DC offset according to me meter on the right channel. if i set the meter on AC, I can see the AC signal on the meter, and on my scope just normal. if i hook the speaker up to the right channel, it fires protector mode. the other channels work fine. any ideas? |
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