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Technics SUV4X new class A Amp - 20 odd years old but lovely sound !!

Amp gone into "safety operation" mode - flashing amber light+no output.
Amp is connected to 1pr. 8ohm KEFS + 1pr. 8ohm CELESTIONS(correct impedance selected on amp). I had it on 3 of 10 ( loud amp - 65wpc ) and the output suddenly stopped and amp went to above mode. i switched it off and noticed the transformer was hot - although well ventilated. ive taken cover off and checked the 2 fuses i could see ( both ok ) + can see no toasted components.Do you think ive cooked the transformer or possibly the output IC?. As the unit will power up i dont think the Transf. is the problem - hopefully it could be other components that are standard service items - cheaper ones??!. Thank you if you can help me. A fellow Biker !!!!!!.

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  • Anonymous Aug 26, 2008

    Me too. Exactly the same. I was given the amp after my old one died (also a vintage hand-me-down!).



    The amp worked perfectly for about 9 months and then all of a sudden the 'Safety operation' light came on and now it just blinks repeatedly and no sound can be heard.

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Hi guys

Quick check... If the amp still stays in safety mode with the vol turned down and the speakers disconnected, it will have failed in some way. Since you have the safety operation light ON, you can expect that the power transformer is OK. I would expect that you have a DC offset condition on one channel. The most common problems you may have are

  1. dry solder joints about the power stages such as regulators, and output/driver transistors/IC's.
  2. blown output transistors/output IC with possible fusible resistor failures, and or sometimes burnt up printed circuit tracks.
  3. a voltage rail failure from a burnt fusible or power supply component.
If you are up with electronic fault finding, soldering and have the tools, have a go yourself, I could talk you through it. If not, I would suggest you contact you local HiFi specialist and find who can repair it or at least check to see what has failed for you. Good Luck. If you cannot find someone, hit me back and I will try to find someone for you. Cheers

regards
robotek

Posted on Sep 06, 2008

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Posted on Jul 28, 2009

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