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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Have a Sony STR-DE635 that keeps blowing the 2 8 amp fuses in the power supply. disconnected all speakers and powered up with same result. Checked bridge rectifier and (2) 10000 uf caps all are good


Have you checked the rails to ground for shorts. Get hold of a variac as it does make things a lot easier.

Sound like you might have some shorted output devices.

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The most likely problem is a shorted diode, I suggest replacing them even if they do not test shorted while not under load. If it is not the diode rectifiers, there is probably a resister in the power supply that is shorted, remember also that it can also be both. Lastly, it can be a capacitor within the power supply.
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1 Answer

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1 Answer

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Replace the FETs with ones from Sony distributor. Do not substitute. Replace all of the small blue disc caps in the area. These can short causing the power supply to fry. In your case, the HOT probably was the initial problem, not the supply.
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1 Answer

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1 Answer

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