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Technics SU-Z22 fails to turn on. There is mains supply to the tx There is no visible power supply fuse or fuse resistor

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  • unclejames50 Nov 02, 2008

    We have checked as advised and without speakers connected. we find there is no voltage to the main board from the tx.
    There are no visible fuses.
    We request that you supply us a circuit diagram showing voltages etc.
    We will then have a clear picture which should enable us
    to trace the fault


  • unclejames50 Nov 02, 2008

    It looks as though we now have the necessary information to effect repair. We should be right now thankyou.

    However, if not, we will get back with it

    Thankyou for your fast and proficient service.

    Congratulations on a excellent product


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  • Pritish Singh Nov 02, 2008

    happy to help you at any time!

  • andrew clarke Sep 25, 2011

    hi im having the same problem wi my su-z22 but as im not technical so the plans dont mean anything to me can u help


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Check outlet and test cable and voltage transformer also check if there any short circuit

plz do rate this post if u can

Posted on Nov 02, 2008

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1 Answer

How do I fix my onkyo tx-sr307

  • Check Fuses
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The thermal cycling of these receivers can result in a failure of the solder joints around the components that get hot. The large capacitors if failing usually show signs of bulging or electrolyte leaking.

When the unit boots up out of standby the unit does a self check to confirm all power supplies are within determined limits. components such as resistors operate near failure limits. These parts are designed to fail similar to a fuse if the circuit is over loaded/heated.

Common problem is the required ventilation is restricted by covering the top etc preventing required air flow, overheats and a safety resistor fails.

Replace resistor with same type to retain saftey features.
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My Receiver has always run fine.. just no display anymore.

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My receiver works line new now!

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