Question about Technics SA-AX7

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My reciever reads overload turn power off

Ya every time i turn it on, it will act like it will work, but only for a split second then will read overload power off overload its frustrating only been used for about five months it been sitting in my closet for two years.

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6 Suggested Answers

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SOURCE: overload

short in ps or amps shorted. Look for burnt parts are bad caps

Posted on Aug 27, 2007

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

CLARKPINK55
  • 71 Answers

SOURCE: overload

internal wickman fuses blown check speakers high unts tweeters\ gone short primary transistors /ic blown

Posted on Dec 08, 2008

  • 336 Answers

SOURCE: receiver says power overload, turn system off

It probably needs soldering of the voltage regulators and/or output IC.
I think that model has an access panel on the bottom (it may need to be cut out then rotated and screwed back on when done).
If it doesn't have the panel the main circuit board needs to be taken out to access them.
The regulators and output IC are mounted on the main heat sink. a little soldering and it should be good as new.

Posted on Feb 17, 2009

  • 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

  • 1 Answer

SOURCE: I have no sound and it reads overload and tells me to turn off

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

Posted on Oct 19, 2009

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My remote doesn't even turn the reciever on anymore. It has new batteries.. the red light turns on. If I manually turn the reciever on and press any button on the remote the display in the reciever...


A make and model number might be helpful.

If I understand you, nothing makes the receiver come on. Is there a reason you emphasize or suspect the remote when the hard-wired power switch doesn't work either?

Generally speaking, an amp protects itself from heat, shorts, overloads and operator exuberance 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. Eure 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.

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1 Answer

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hi there i have had this problem with technics amplifiers generally with them it was negative and positive mix up between input terminals for the speakers or in other case's running the amp with 2 many speakers.
eg. having 2 speakers Bi wired into 1 input making a 6.1 receiver into a 12.1 which makes the amp struggle causing overload or the worst case is a power unit problem.

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Receiver shuts off at higher volumes


The receiver may be too under powered for your speakers or the speaker ohm's may not be matched for your amp.

The reason it is shutting off is likely because the amp is becoming overloaded. At lower volumes the amp can handle the load of the speakers, but at higher volumes the power supply of the amp can't keep up with the power demand the speakers are pulling.

If you were previously able to turn the reciever high without turning off, then there is likley something wrong with the amp or possibly a blown speaker.

Try measuring the resistance of the speakers if you have access to a multimeter. They should normally read 8 ohms for home speakers, but some common home speaker impedances in order from (I'm assuming) most common to least common are are 8, 4, 2(bose), and sometimes 10 or 12 ohms. The lower the number of ohms, the more power the amp will need to put to the speakers and the more chance you could be overloading your amp.

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Our Pioneer Receiver VSX-312 gave us an OVERLOAD error message while trying to play a DVD and a music CD, and there is no sound. It was really hot. After it cooled off, we tried it again and it did the...


This sounds like the audio power amp has shorted which explains the heat when it failed and the cool temperature when you tried to turn it back on. Usually these recievers have a removable bottom plate that lets you access the bottom of the boards. As there are usually 4-8 transistors along a heat sink that are paired. Check them in diode scale and look for multiple values of 0 from any single transistor. If it gives you 3 or more readings of 0 then its shorted.They also may read low,around 70 or less.In which case it needs to be replaced.

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An Yes/ it is possible that you might be doomed/ but I would go back/ Download the update with out being connected to the reciever/ Open the download/ Make a folder for it to uncompresse to. Choose that folder when prompted as to where it is sent when uncompressing.
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Sorry about the caps/ I am not trying to yell or what every they say about caps. It just is really important to read everything first. If you don't think you understand what you read/ Read it untill you do understand it. Do more research until you do.

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