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

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  • Sony Master
  • 5,807 Answers

Hi,

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

circuits.

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

1ef30ab.jpg



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


Thank you for choosing FixYa for assistance. I hope that my

information proves useful to you. If so, please take a moment

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


Regards,

palaboy





Posted on Feb 02, 2010

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