I own a classic Sansui intergrated amplifier (AU-717). It has a short in one channel. At low volume, the sound shorts out. I've had this unit for about 20 years now. Otherwise, it's a great product!

Help and a repair video in the link

https://www.google.com/search?q=Sansui+AU-G77X+Amplifier.+Protection+light+blinking

..

Replace the speakers.

You need cable called RCA. What goes out of one unit goes in to another. Get the owner manual and read it. It will show you how to connect the wires to the components.

Connect the RCA jack to to tuner input in back. CD player to the aux in back.

Try this:

http://stereobarn.com/how-to-connect-a-stereo-system1/

If the speaker protection is activated then this would indicate that either a dc voltage is appearing across the speakers or a short circuit on one or more speaker cables. Since you are able to get normal sound through the headphone function the former is less likely and you should check for a possible shorting speaker cable. Another possible cause for the symptoms can be dry joints on the speaker protection relays.
regards from Vintie

Hi info851163...
Go to the following website and register to download your Owners/User Manual for your Sansui Intergrated Amplipier AU-D9.
Please take time to rate me thumbs up


http://www.hifiengine.com/manuals/sansui/au-d9.shtml

Also at this website...for $6.92 Canadian Dollar:
http://www.ioffer.com/i/Sansui-AU-D9-amplifier-Service-manual-79410631

sounds as though (at high volumes) the amp thinks it has a short circuit. This may be caused by the way you have them connected.
Speakers have a resistance and amps needs a certain amount of resistance to function right (too little resistance = short circuit)
The way it works out for the speakers is, if the two are connected to one amp output channel, the amp will see half of the resistance of a single sub. (4 Ohms/sub amp sees 2 Ohms)
If the amp instructions say that it's 4 Ohms/channel then you need to use 1 channel for each sub.
Hope this has been some help.

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

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.

A replacement control will be difficult to locate as it is long out of standard service time. That being said, it is also rather rare for a control to fail completely. Can you please indicate why you feel the volume control is defective? Perhaps there is another problem that will be easier to repair.

Thanks,
Dan

This company is not like they used to be. You can try the links below to see if you can find authorized service for your set.

Sansui:
http://www.sansui-india.com/

http://www.classicsansui.net/


Historic information about Sansui:
http://en.wikipedia.org/wiki/Sansui


I would personaly suggest to find a service center or a very good local tech who can do audio amplifier and reciever service.


Jerry G.

possible short in speaker system. Disconnect the speaker to that channel. if it does not click off then you have a short outside the amp in your wiring or in the speaker.