Question about Technics SA-AX540 Receiver

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Sa-ax540 overload! i have a technics sa-ax540 stereo reciever, and its overloaded. i need the button sequence to unlock, anybody out there still have there old manual?

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  • mrogers71718 Mar 22, 2009

    I get the "overload" message as soon as the audio starts to play on my DVD/CD player. I can play sounds/music through other devices and I don't have an issue.

  • desertskies May 19, 2009

    Technics SA-AX540 overloads shortly after turning on. The manual does not mention a 'button sequence' to 'unlock' the overload. It does state that overloads occur due to speaker wire shorts between pos and neg, too low an impedance in the speakers, excessive volume, excessive power or high temp environment. They say to determine the cause then turn back on. I have read that the output IC solder connections are sometimes less than adequate also the dielectric compound to the heatsink has been a problem. I've yet to try replacing the compound.

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5 Suggested Answers

freetek
  • 5568 Answers

SOURCE: Overload on Technics SA DA10

This is an old message so you may not be interested any more.
There are a couple of possibilities; the high power of this unit seems to fry speakers fairly often and although they mostly fail 'open,' they can overheat causing the voice coil to lose its insultation and cause a short instead.

This may also be caused by the failure of one or more output modules causing the power supply to limit and give you the overload indication.
If an output module has failed and the unit is not limiting current, it may destroy speakers too.

Some knowledge and a decent meter would reveal the nature of the failure pretty quickly but describing the steps necessary to troubleshoot this is a little beyond the scope of this forum.

Posted on Apr 23, 2008

  • 1 Answer

SOURCE: Overload on Technics SA DA10

Cracked solder joints due to excessive heat cycling. Do not place in a shelf system. Top MUST be open for 1 ft. or better for proper convective cooling effect. Mine suffered same fate but repaired locally.

Posted on May 27, 2009

Sparky2012
  • 102 Answers

SOURCE: 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.

Posted on Dec 04, 2009

dunnbiker
  • 8546 Answers

SOURCE: My Technics SA-AX540 AV Control

Heat?


Generally speaking, an amp protects itself from heat, shorts and overloads by refusing to turn on or stay on.


Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; 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 and competent hands-on tech.


Check for loose speaker connections as a root cause for intermittent shutdown.

Posted on Feb 21, 2011

  • 29 Answers

SOURCE: My Technics SA-AX540 AV Control

This component RSN310R36 audio power module is overheating (40-45 degree Celsius). The fan at the back is not continuously working so this component gets overheat. Simple solution is to get a 12 volts power supply and connect the fan together. This will lower the temperature of the RSN310R36 (audio power module). Or if you really want to improve the temperature inside is add extra computer cpu fan. Either drill the top cover and place the fan directly to the component and heatsink. Like what I did. Good luck.

Posted on May 31, 2015

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Is there anything on top of the av receiver? Try and run the reciever so that it has enough cooling. B) Allthough overload, there is a possibillity it is causes by speakercables who are shortcircuiting once in a while. Usually somewhere at the back of the reciever or speakers.

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Most overloads are caused by the main output devices. They will go short circuit if for example speaker wires have come into touch. Another cause is high volume or a faulty speaker. Or poor ventilation around the amp causing excess heat.
The only cure is to replace the device(s) generally located on the heat sink.

Dec 01, 2013 | Technics SA-TX50 Receiver

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When I turn the reciever on it says OVERLOAD+to turn the power off. Which is strange because I rarely use it. MAYBE 2 hours per month+I can NOT afford a new stereo.


Hello - There are two possible causes for the error (that don't involve something broken).
The first is that the receiver is not getting enough ventilation (stuck inside a cabinet with no space, etc.) but since you you describe it happening as soon as you turn on the receiver that's very unlikely.
The second and more likely cause is cross connected speaker wire. Remove the speaker wires from both the receiver and speakers and carefully reattach them. Hopefully that will help. Otherwise it looks like you would have a repair decision to make.
Good Luck, Mikeywaf

Mar 03, 2011 | Technics SA-AX540 Receiver

2 Answers

My Technics SA-AX540 AV Control Stereo Receiver keeps shutting off and on and displays overload. Does anyone have a fix for this problem?


Heat?


Generally speaking, an amp protects itself from heat, shorts and overloads by refusing to turn on or stay on.


Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; 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 and competent hands-on tech.


Check for loose speaker connections as a root cause for intermittent shutdown.

Feb 21, 2011 | Technics SA-AX540 Receiver

2 Answers

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.

Dec 04, 2009 | Technics SA-AX530 Receiver

2 Answers

I have a technics sug91 amp the over load light comes on what can i do to remove it


you cant remove the overload light. it does that as a safty so you dont burn up the amp when its not being used properly. do u have a capacitor? are the speakers ohms and watts the same as the amp?

Oct 18, 2009 | Technics SA-AX540 Receiver

1 Answer

I have no sound and it reads overload and tells me to turn off power. what do i need to do?


Hi

I have the same problem and a common problem with this model is :
"Technics models are sort of notorious for bad solder connections, especially
at the output IC's and regulator transistors. "

I hope this helps you

Sep 08, 2009 | Technics SA-AX540 Receiver

2 Answers

Overload protection


Doe this always go into overload independent of the volume level? Try disconnecting the speakers completely and running the set. Does the set shutdown then too?

Thanks,
Dan

Jan 16, 2009 | Technics Audio & Video Receivers

2 Answers

Overload on Technics SA DA10


Cracked solder joints due to excessive heat cycling. Do not place in a shelf system. Top MUST be open for 1 ft. or better for proper convective cooling effect. Mine suffered same fate but repaired locally.

Feb 23, 2008 | Technics SA-DA10 Receiver

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