Question about Technics SU-G75 Amplifier

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Technics SU-G75 overload

Display reads out "overload" when plugged in

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I have the same will be required to remove the board and resolder "cold " solderings... None of above solutions have been helpful, but "you get what you paid for"..and I completely disagree...even if required, remove ALL audio power managing circuitry and replace this expensive original design with TI´s Integrated chips..using PWM technology..unless you want to go back to L6, ot Kts tubes..

Posted on Aug 16, 2017

  • allen1pow812 Oct 23, 2017

    I found a problem, one of many, described above..but found an easy way to fix this overload problem.

    1. Ensure that every output is connected per instructions.

    2. If still get this nasty "overload"..unplug your amp and remove cover.

    3. Locate the cooling fan and remove it from chasis. Measure resistance..per instructions above..maybe should measure 12 ohms or so

    4. Apply 12 Vdc to fan..ensure it works!

    5. Clean contact plates on both, chassis bend chassis flexible copper contacts and clean fan to ensure good electrical contact.

    6. Install fan to chassis and connect.

    7. Turn on amp and observe , at low level that display is clear..

    8. Turn the bass control to max, and the bass boost pushbutton on

    9. Play some music with a lot of bass passages, and turn up the volume level . Put your hand on back of the fan..notice how the fan turns on an every bass beat..If you have an Audio Frequency Gen ..set it anywhere from 40 to 300Hz. Fan should come on..and the "overload" display should be clear

    Conclusion: Very bad design , the MP does not read temp of the just acknowledges if fan is connected..The temp sensors are used for another purpose.

    AND ensure that contact to the fan are clean, and make GOOD contact. Best if just solder those fan contacts!

  • allen1pow812 Oct 23, 2017

    Just another comment..regarding Technics QA.. RELIABILITY and Audio design..
    Not bad, considering age, comparison and compatibility with XX decoders up to 7 channel recordings and dynamic audio works fine.



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Posted on Jan 02, 2017

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SOURCE: Technics SU-G75

I had the same problem. The solution to me was presoldering transistor Q708.

Posted on May 08, 2009

  • 1114 Answers

SOURCE: Tecnics SU-G95 stereo overloaded

Power down,disconnect the speakers and power back up. If it still say's overload, it needs to go to service. If not, check your wires, connections, and speakers one by one to hunt down the problem and correct. Hope this helps

Posted on May 25, 2009

  • 1175 Answers

SOURCE: Technics su-Z750 Intergrated Amplifier stays in Standby

This happens when one or more components in the power amplifier section has failed.

The protect circuit keeps large DC voltages off the speakers.

The only thing you can check for before finding a tech is that the speakers are firmly connected at both ends. If they are ok, you need a tech

PLease rate my help if this helps

Posted on Nov 09, 2009

  • 96 Answers

SOURCE: technics amplifier su-g75 stopped working suddenly


Posted on Jul 17, 2010

  • 794 Answers

SOURCE: i have a SU-G75 Technics stereo intergrated

Hi grayjt1963,

Based on the symptoms that you described this problem is caused by either of the two components. The most likely reason why you are getting no sound at all right now is the protect mode which your amp is in right now with the outputs turned off to prevent further damage. This unit have an AMP-Pac for the final stages that may be defective. The part number is RSN3306. This is the most likely part and can be purchased for about $60. Also inside is another AMP-Pac for the center and rear speakers (SVI3204B) which runs about $58. Either can cause the symptom you describe.

Hope this helps.

Thank you for using FixYa.

Posted on Jun 28, 2011

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