Question about Sony STR-DE945 Receiver

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Blows bothe fuses on power supply bd. b- shorted

My sony blows both fuses on the power supply bd (the one with 2 fuses two small caps and two large caps). I found that the B- voltage was shorting. This lead to finding that the two CENTER CHANNEL power transistors had two legs shorted together (center and right). I unsolderded them an smoked a 22mf 100V cap beside the conector on the main bd where B- and B+ come in. I need to find out where to order the tranistors or a substute part number. The number on them are SK B2560 AND SK B1647. There is also a nimber on the bottom (010). Thanks

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The transistors you need are 2SD2560 and 2SB1647. (either you miss-read the D for a B or it was a typo) You can get them at: www.mcmelectronic.com
2S is a prefix on all Japanese transistors.
The 010 is a date code

Also check for open resistors from the base of those transistors and the dual emitter resistor (large white three leg resistor .22ohm)

Posted on Mar 01, 2009

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