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Technics stereo SU-G75 power comes on For 5 seconds then overload light appears

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There are many different types of "protection" that are meant to protect the amplifier. One is DC Protect, which means a damaged amplifier, Overload, which means the output stage is running too hot, etc. Think of this. All the amplifiers are basically the same, and here's the important part, there is one lead from each channel, that ties to the same line going into the microprocessor(computer inside, or a more simple protection circuit). Therefore, anyone of the amplifiers that has one of the issues above, will cause the entire amp to shut down. Another issue, it's very unlikely for the amplifier would overheat within 5 minutes. you may have yet another issue mimicing an overload issue.

If you are interesting in having your amplifier repaired, please look to my website at audioserviceclinic.com. Thank you.

Posted on Aug 09, 2015

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  • Expert
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Hi try to unplugged your speakers directly to the ampli to test if you don't have a short circuit with the lines or the speakers. If the problem persist you have to go to a repair/shop.
Have a nice day

Posted on Nov 19, 2014

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Posted on Jan 02, 2017

Grubhead
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SOURCE: I have a technics amplifier model SU-G75, it will

You have basically the same problem as a chap with another amp on this site. So here's what I told him:
"You need to determine if the power is getting to the audio amp section. For instance with the volume full up is it humming etc?
As a 'rule' it's unlikely that both left and right channels will fail at the same time (unless you have done something silly with the amp) you are looking for something that is common to both channels. Which is why the power section is first suspect. The exception to the rule (above) is where amps use say an IC power amp for both channels. You will find this IC on the big heat sink. Check whatever is on that anyway for damage or burning.
The only other area could be the pre-amp part. Again this could be a single IC controling both channels, so it's failure could cause a loss of sound. By the way if you can hear music/sound coming through when you put it up to full volume the pre-amp will be generaly good. "

Posted on Nov 24, 2009

  • 1 Answer

SOURCE: Technics SU-G75

I had the same problem. The solution to me was presoldering transistor Q708. http://www.flickr.com/photos/37147023@N03/3511227679/?edited=1

Posted on May 08, 2009

smarthome2
  • 1114 Answers

SOURCE: Tecnics SU-G95 stereo overloaded

Power down,disconnect the speakers and power back up. If it still say's overload, it needs to go to service. If not, check your wires, connections, and speakers one by one to hunt down the problem and correct. Hope this helps

Posted on May 25, 2009

Grubhead
  • 5126 Answers

SOURCE: I have a Technics Stereo Integrated Amplifier

Are these resistors near or linked to whatever is on the heat sink? If they are then they are bais resistors and they have burned up due to a fault on the devices on the heat sink.
Resistors are cheap, all you need to do is find out what value they are. This is part of the colour code. However if they are burned then you might not be able to read the code! So you will need the circuit diagram or someone to tell you the value.
The problem however will be if whatever on the heatsink has gone!
It could be an IC since you have lost both channels, unless you have shorted the speaker wires of both channels somehow and blown both right and left amps!

Posted on Nov 27, 2009

tamcross
  • 96 Answers

SOURCE: technics amplifier su-g75 stopped working suddenly

CONECT THE SPEAKER WIRE PROPERLY

Posted on Jul 17, 2010

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1 Answer

Technics SU-G75 owners manual download


http://www.manualslib.com/manual/926367/Technics-Su-G75.html?page=2#manual Technics SU G75 Service Manual Page 2

Sep 23, 2015 | Technics SU-G75 Amplifier

1 Answer

Want to download Technics SU-G75 service manual


Technics will not give it to you. Gotta pay the piper!

Did you try to google it - might get lucky - but don't hold your breath.

Sep 21, 2015 | Technics SU-G75 Amplifier

4 Answers

Technics stereo Integrated Amplifier SU-G75 powers up few seconds then overload light appears and a clickng noise coming out of metal boxq with tag FP-3 M V RTP1P5C015 on it iis it supposed nto make c


If the receiver works at low volume, but goes into OVERLOAD and shuts down at higher volume, it means you are player the unit too long and too loud. Try yo keep the volume down to a reasonable volume.

Nov 15, 2014 | Audio Players & Recorders

1 Answer

Technics SU-G75 has no sound


Hello
when the resistors are burned,means that the transistors are damaged, or the power module is damaged.
and in your case its the power module.
Hope this helps.


23392686-biweyzzz1swyjlxgbbebmoak-5-2.jpg

Feb 07, 2014 | Technics SU-G75 Amplifier

1 Answer

No sound from stereo


Greetings
the power module is damaged and the components ... as you described, resistors burned and other components are over heated .
you need a service technician if you are still hanging on your baby :)
unless you are a technician .i will be glad to send you send you schematic.
i cannot post it as(PDF).

Dec 29, 2013 | Technics SU-G75 Amplifier

1 Answer

Technics SU-G75 overload


I have the same problem..it will be required to remove the board and resolder "cold " solderings... None of above solutions have been helpful, but "you get what you paid for"..and I completely disagree...even if required, remove ALL audio power managing circuitry and replace this expensive original design with TI´s Integrated chips..using PWM technology..unless you want to go back to L6, ot Kts tubes..

Nov 07, 2012 | Technics SU-G75 Amplifier

1 Answer

Speakers for Technics SU X933?


check given link for speakers
http://www.fixya.com/myhome.aspx#Answers

Jun 05, 2012 | Technics SU-G75 Amplifier

1 Answer

I have a Technics SU-G75 SIA and when i cut it on it doesn't make the extra "click" sound... ok like when you first cut a radio on, after the first 5 seconds you'll hear a click like the speakers...


Is there a problem other than a missing click?

Or is it silent and essentially dead?

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. 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.

Mar 28, 2011 | Technics SC-S32C0 Shelf System

1 Answer

I have a Technics stereo integrated amplifier SU G75. The cooling fan began making chirping noises then stopped. Now every time I turn the stereo on I get a overload message. Could it be the cooling fan...


It chirped because the bearings were worn out, then it froze up and isn't moving any air. Get it replaced. DO NOT run the unit if it keeps overloading or you will have a bigger problem.

Dec 27, 2009 | Technics SC-DV290 System

3 Answers

Technics SU-G91 OVERLOAD PROBLEM


THe amp has detected a problem and shutdown to prevent further damage. This unit has 2 amp pacs inside and one or both have failed. If you can solder, you can fix this yourself. The main amp pac is an SVI3206 and can be purchased online for about $60.

Keep me posted.
Dan

Oct 17, 2008 | Audio Players & Recorders

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