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I have 2 Technics SA-GX390 stereo receivers, both go into overload when power is applied. Without a schematic or at least a block diagram it is impossible to troubleshoot. Does anyone know where i can get a schematic. These units are about7 years old. Ian Ladd E Mail, pearl1pearl2@rogers.com

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When go to overload always be the audio amplifiers IC damaged disconect the ic and then turn on the device it this stay replace the ICs.Good luck

Posted on Aug 11, 2008

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Technics sa-dx1050 overload


if any one of the channels was shorted out, even momentarily, that channel's output transistors would likely be blown causing it to stay in protection mode. (or overload as you put it). Time to visit the repair shop.

Jul 23, 2012 | Technics SA-DX1050 Receiver

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I have a Technics AV control stereo receiver sa-g78 Whenever I turn it up a little louder than normal..is says overload then it powers off...I need someone to tell me what I need to do...but dumb it down...


Overloads can be from excessive periods of high output and shorts would be wiring issues or a speaker blowing up.


You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.


If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.


If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced hands-on tech.

Jan 28, 2011 | Technics Audio & Video Receivers

1 Answer

On switching my technics sa-dx750 it says switching off overload


The question is what is causing the overload? The power supply or the output devices on the heat sink?
If you have accidently shorted a speaker wire, then the answer will be output devices, otherwise it could be anything in the power section. You may find a burnt or damged device with either of the causes.

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My Technics AV Control Receiver SA AX530 is in overload


An amplifier should never be turn on without speakers, it will overload internally.
make sure speakers work and try again.

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Need wiring diagram I need a schematic for a Technics SA-EX140.


I became a member at http://www.free-service-manuals.com/ and downloaded the schematic I needed.

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Overload at medium (4-6) volumes. Can you adjust or disable the overload protection on these Technics amps??


try this mate:
http://www.electronicspoint.com/googlesearch.php?cx=002919058480771089906%3A03mranmmdze&cof=FORID%3A10&ie=UTF-8&q=Technics+SA-GX550&sa=Search#862

May 23, 2009 | Technics SA-EX400 Receiver

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I have a Technics SA DA20 control receiver. I was given it by an electronics workshop and it has this same error of OVERLOAD coming into the display when switched on. I removed the plates from underneath and re-soldered as far as I could all the points along the stereo amplifier ICs and as far as access would allow. The unit then worked normally for several hours. I was very pleased, and went out shopping!. But on my return after it had been off for about an hour, the same problem has come back. But my boss at the electornics workshop thinks it it just a dry joint, or series of dry joints. The unit is complex to dismantle, so patience and care is required in taking it apart and making a note or diagram of how it comes to pieces and how to re-assemble it after the board has been re-soldered. It does not appear to be a component problem or fault with the SVI power amplifier ICs.
petertaussig33@hotmail.com

Feb 23, 2008 | Technics SA-DA10 Receiver

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