Question about Sansui Vintage Au-517 Intergrated Amplifier - Excellent Condition

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I have got a Sansui AU-X 517 R Stereo Amplifier problem face is about any one of the channel goes off with some scratchy sound after using the system for 10 to 15 mins and again works perfectly after few seconds such incidents happen offen when i connect any 3.5 jack MP3 music input

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6ya6ya
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Posted on Jan 02, 2017

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palaboy
  • 5807 Answers

SOURCE: Sansui AU-D77X left channel output transistors

the first thing the tech must do is to insure that there is no more than 2V on the base of the
pre-drivers of the driver transistors.

If it do then connect the pre drivers and monitor for:
a ) DC offset
a good amp never produce an over of 0.7V on its output
b ) measure the idling current , more than 80 mA is hazardous to your output
transistors.

Test and continue listening for a day.
( without the output transistors )

you can even series additional resistors on the emitters to be safe
( like 100 ohms on each )
Better if you can work and test the amp in about 1/2 of the AC supply.
( if your using 220V trim the supply to 110V )


These pre-drivers are the determining point of the life of your amp.
These may run hot , but will never burnt
( assuming there are no more faulty components starting from the input )

If it does then you may have to check the VAS circuits
and the long-tailed or differential input circuits.


If these works for a day , then connect your output transistors.


These are your pre-driver transistors ( left side of yellow line )
output transistors (right side of yellow line )


palaboy_99.jpg




they should be replaced in pairs






Posted on Mar 04, 2011

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dunnbiker
  • 8546 Answers

SOURCE: Sansui Amplifier RZ 7900 The surround

I can't find a manual but I'll take a stab.

When you say it fades are you being literal? In the digital world things usually change suddenly or stop altogether.

I'd look at the receiver for an indicator that indicates the multichannel nature of your incoming digital audio. Many have little maps or icons showing the number of speakers supported at any given time. That's a function of the incoming data stream and/or whatever the audio source it carries. For example, when loading a DVD I usually see 2.1 indicated on my unit while the low-tech menus and previews are active. Once the multichannel program commences the 5.1 indication lights up.

It almost sounds like the digital bitstream is being corrupted and the receiver shifts down to whatever it can manage to decode from it. Check the cabling that carries the audio. If it's optical instead of copper, I'd check to make sure there are no tight bends or kinks in it anywhere.

Posted on Dec 23, 2010

dunnbiker
  • 8546 Answers

SOURCE: I have a Sansui 717

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.

Posted on Jan 23, 2011

  • 49 Answers

SOURCE: how can i connect my pc to a sansui R-950AV receiver and then to speakers ?

Connect it to the (Auxillary) Jacks,

Posted on Dec 02, 2012

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No volume on all left side speakers


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Testing for a Head Unit or RCA Cable Problem Pull out the head unit from the dash so you can access the RCA cables. Unplug both RCA cables from the head unit. Do not disconnect any other wiring. Plug the right RCA cable into the left channel of the head unit. Turn on the stereo system.

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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/

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There would be no reason to connect the CD player to a Tuner. Not even sure a tuner whould have any inputs in order to connect a CD player.

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Buy some electronic contact cleaner, remove top, spray volume and balance pods and use the straw provided to target the small hole. Move controls back and forth as you apply the cleaner. If that fails! then the problem is a bad driver or audio output semiconductor.

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Hi info851163...
Go to the following website and register to download your Owners/User Manual for your Sansui Intergrated Amplipier AU-D9.
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http://www.hifiengine.com/manuals/sansui/au-d9.shtml

Also at this website...for $6.92 Canadian Dollar:
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No that's how to describe a problem, folks - with details. Using internal FM as the source is always the preferred way of troubleshooting system-wide receiver audio problems (no cables or setting in the way).

Does the sound come on immediately with power and then fade or is there a small delay while the electronics stabilize, a click and then sound that fades?

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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!


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

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