Question about Technics SA-DX750 Receiver

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Sa-gx550 technics reciever

I have a sa-gx550 reciever that the overload protaction light keeps coming on and shuts down the system. you can turn the reciever off and re-set it but in five minuets it shuts down again

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  • robert estes Jan 22, 2009

    i have tried unhooking and rehooking the speakers and checking if they are matched properly. it seems that it will work about five minuets and shut down again. with or without speakers

  • robert estes Jan 22, 2009

    i have no pets and this problem happens with or without speakers

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Hi
i think the circuit breaker is the problem....due to voltage problem

Posted on Jan 23, 2009

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  • Technics Master
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Your system is going on protection, because had detected an internal fault.

This typically happens when you have a short, or an internal component had blown.

The unit must be taken apart and tested using a multimeter to fix the problem.

Posted on Jan 23, 2009

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This particular model contains and amplifier pac for the final stage. This is lilely to be either overheating which can occur when the heatsink compound ages and dries up, or it is a defective amp-pac. One other thing to check with these are the connections on the voltage regulators. These look like transistors and are marked 7812 and 7912. They will hav 3 pins each. The amp pac is an SVI-3206 which is still available but will cost upwards of $65-$75 for the part. If you can solder, try resoldering the pins of the regulators first.

Let us know your results.

Dan

Posted on Jan 23, 2009

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If you remove the cover you will see a wire harness with 3 wires on it plugged into the main board and attached to the board with the speaker connections. Once you pull this wire you deactivate the overload protection and it will work fine. I do this to all my stereos and suggest everyone else to do the same

Posted on Jan 23, 2009

  • Nate Stansfield
    Nate Stansfield Jan 23, 2009

    here is a link to your service manual (copy and paste in your browser)

    http://www.eserviceinfo.com/downloadsm/3...


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Welcome to Fixya! Have you checked the Cooling Fan?????? If there is not a Cooling fan on this Model, You will need to Replace the Power Supply In the Reciever. I Believe that you can get these at Radio Shack or Technics.com. Let me know what you find out!

Posted on Jan 23, 2009

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You are experiencing thermal shutdown... basically the unit is getting too hot. if the reason is not poor ventilation then you have a component failing. before i give you more advice on fixing it how comfortable are you opening the unit up ?..

Robert

Posted on Jan 22, 2009

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Hello,

Do you have any pets you have to check the wiring make sure there aint no breaks in the wire also make sure there aint no wires that you have going to speakers taped or anything like that ive had this happen to my car amp and thats what kept happening the wire was split and grounding to metal i know its differnt for a house but the same concept i dont know what you all have hooked up through the system for example if its tied in with a surround sound for entertainment check the bass box connection because that carrys the bigggest load make sure its all connected right...Last but not least check if it has opticial connection if it does hook it up through that its ten bucks for a cord and that would even solve the problem if it has it... let me know some more info and we can go from there ill check for your reply every hr...

Thanks,
Steve

Posted on Jan 14, 2009

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Hi,
Overload protection activates when output amplifier detects any DC voltage in output or sense any impedance mismatch with speakers (causing more current consumption)
I would suggest following tests / checks.
Please check each speaker wires properly connected in terminals.
Remove all speaker and connect one speaker at a time to test unit overload activation. This will narrow down bad speaker, if any.
Let me know about results to proceed further.
Thank you.

Posted on Jan 14, 2009

  • Shahid Electronics
    Shahid Electronics Jan 22, 2009

    OK, Unit goes to over load protection mode with and without speakers.
    Protection section needs to be checked on component level and its job of qualified technician.
    If you have experience and knowledge od electronics then get related service manual to test / check the unit on component level.



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Its the problem of internal cable or internal circuit getting short somewher needs to be checked and replaced.

Posted on Jan 14, 2009

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  • Technics Master
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In the main amp (not preamp) section there are large output transistors, when these fail many times they become shorted, this causes excessive current draw and either blows the output fuse or in your case turns the light on, they can replaced, they ae on a large heat sink

Posted on Jan 22, 2009

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