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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!

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Hi mellemcee


Cool amp mate, and becoming collectable now to. Sansui amps from the era where the best in the world of HiFi. iT may have lost bias control to the offending channel, it may have dirty source switches, tape monitor switch, or even speaker switching. The speaker protection relay may also have a dirty contact, will usually burst back into life with a quick rotation of the vol control. Can you pin the problem down a little more with the info i have given you, try all the controls to see if it impacts on operations, you will need to fix those problems first. Low bias would make that channel sound distorted at low levels also. Is this what is happening to you??

regards
Graeme

Posted on Apr 18, 2008

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Off of the top of your head could you tell me what my problem with my sansui AU-717 amps problem could possibly be? When I am playing a cd if the volume is even barely loud the sound will go out then I...


It sounds like one of the following:
> You have an impedance miss-match between your speakers and the amp (speakers have am Ohm rating lower than the amp can handle),
> You have the switch set to both A&B speakers turned on, but have speakers connected to either the A or B set, but not both, or
> You have both A & B (4 speakers) connected, and one or both have an Ohm rating lower than 8 (if two sets are connected, they must be 8 or higher).

My best guess off the top of my head.

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I have a Sansui 717 Receiver/Amplifier. Everytime I turn on the power it will warm up for a few seconds...the blinking will stop and ready. I try to turn the volume up and it cuts out immediately. Can this...


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.

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Suddenly, amplifier stopped giving out sound. Controls and display seem to work fine. If it is blown fuse, where is it & how can i replace it?


Does it stop on both channels? It sounds to me like the safety circuit is activating. This usually happens when either the volume is too high, or the speaker load is too great (i.e. usually loads less than 4 ohms will do this) or, the amplifier has an internal short causing the amplifier's output stage to become un-balanced. Does the sound come out nice and clearly through both channels? How long does the receiver play before the sound stops? How loud are you playing the music when it stops like this? If the sound is reasonably clear through both channels at regular volume, then there is probably nothing at all wrong with the receiver's output circuits. If the amplifier is being played at regular volume or even lower volume for quite a while and then quits, perhaps the receiver is getting too hot and it's thermal sensors are activating the protection circuit. Make sure that when you operate the receiver, that there aren't things laying on top of it blocking the unit from venting and cooling properly. Make sure it has plenty of breathing room - amplifiers (most of them anyway) are inherently subject to producing heat. If the amplifier only quits when played at high volume, well then that's probably the problem - it's probably not meant to deliver such power that you're asking it to - especially if you're driving a heavy load such as 4 ohms or less. If you're running several speakers on this unit, try scaling back to just two speakers for now, and make sure these are 8 ohm speakers. Play the unit for a while and see how it does.

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You need a voltmeter for this and would have to check for DC on the speaker output terminals. Once you attempt to turn the unit on (before it quickly goes into shutdown), look for any DC voltage over
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Hi p00pmeister

This great old amp uses an Alps brand attenuator. This could be a little hard to find an exact fit replacemernt. Have you tried to clean the control. The can generally be restored by flooding the internals with CRC 2-26. If you have intermittent channels, check also the amp/preamp switch to the rear of the amp also.

Check out this Has some instruction on dealing with the disassembly of the attenuator

I am more than happy to answer any other questions you may have about it, just give me a hoy :) If you are still unsure, or have problems, then before you give a rating for this advice, please get back to me and we can try some more things.
Thanks for using FixYa, If you consider the advice I have given you as sound, a FixYa rating is a great reward for my efforts to help you. Cheers.

regards
robotek





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1 Answer

I have a Sansui AU-717 Integrated Amplifier that needs some work done on it. Is there a Sansui service center in Washington State that can work on this?


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.

Apr 13, 2008 | Audio & Video Receivers

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