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Sony str-k740p will not power up unless unplugged each time after using.

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a ) Servicing the unit requires a service manual like the one @

Sony Service manual

b ) You need to open the unit and first check for low voltage supply

and regulators such as 12V , relay drive circuits and protection


here is the exploded view

sony str-k740p will not power - 8fea4d5.jpg

c ) Regulators which include the 5V needed for the microprocessor

to power up the unit.

these one may look like yours

Standby Circuits


d ) Check also for shorts or offset voltage on the output stages

of each main amp .

like these

Let me know, if you needed further assistance after you have

started probing around

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to provide me with a positive rating. I'd really appreciate it.



Posted on Feb 02, 2010


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