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Sansui rz6700av does not give out sound at all. Checked the output transistors - working perfect! what is the solution?

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4 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

barbu51
  • 566 Answers

SOURCE: How do I adjust the output bias current on a

Hi davoid
Connect your voltmeter`s probes on the "emitter" of the two output transistor, or in other words the measurement is made between the emitters of the output transistors.
Turn on the amp but do not let the output get hot.
If only one side was repaired then you could use the good side and measure its biais as reference. Or
Adjust the biais at between .007 to .014 volt, so it is fair to say that at .010 volt you would be in the range.
repeat the same for the other side if needed.
Hope this help and good luck

Posted on Mar 16, 2010

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

gopakumarg43
  • 74136 Answers

SOURCE: sansui sv29276

Replace all the capacitors connected to the horizontal output section. Especially capacitors connected to the collector of the horizontal output transistor.

Posted on Oct 17, 2012

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1 Answer

Determine if an analog receiver has blown a channel


When you need to replace the output transistors, do them both at the same time with a matched pair. That way you won't unbalance the power supply and will be assured of the same power out is available on both channels.

Feb 18, 2016 | Sansui Audio Players & Recorders

1 Answer

A sansui tv switches on and off by itself. What could the problem?


Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
Desolder out the horizontal output transistor, and now power on the set. If the set now powers ON, replace the horizontal output transistor. It is faulty. [Collector to emitter or collector to base leak]

Jun 26, 2015 | Sansui Televison & Video

1 Answer

Sansui tv no picture but has sound


Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/

Jul 31, 2014 | Sansui Televison & Video

1 Answer

My sansui 74cm colour tv model sv29281NICAM give sound but no picture.What can be the problem?


Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/

Jul 29, 2014 | Televison & Video

1 Answer

Sansui sv29276


Replace all the capacitors connected to the horizontal output section. Especially capacitors connected to the collector of the horizontal output transistor.

Oct 16, 2012 | Sansui Televison & Video

1 Answer

I have an old Sansui 400 receiver. I get no sound from the left channel--both A and B speaker options. The speaker and wires are OK, because they work when hooked to the right channel contacts.


The problem seems to be the left transistor part of the unit. Try this:change A versus B speakers, asuming speaker A was working properly. If still speaker A, now connected to left output does not work, you will probably have transistor malfunction on the left channel of the receiver. Any electronic store will substitute the left transistors.
Good Luck.
Flavio/BRAZIL

Jul 23, 2010 | Sansui Audio Players & Recorders

1 Answer

Left channel is not worthing


Hi, it could be the output relay, or fuses, have you checked the output fuses or any fuse that has blown, Check for anything that shows signs of overheating.May be the output transistors could be blown. If you are not qualified then i would suggest you get an engineer to look at it otherwise you may end up in hospital or even worse DEAD.
We don't want that to happen, do we.

If yo need more help , please ask.

Regards - Anthony

Feb 04, 2010 | Audio Players & Recorders

1 Answer

Hissing sound inside my sansui tv


You have a short on the secondary side of the transformer that is hissing. You are going to need someone knowledgeable in electronics, to help you find the short. Most likely it is your Horizontal output transistor.

Sep 08, 2008 | Sansui Televison & Video

2 Answers

Amp : sansui au11000 blown transistors on driver board


may i ask you did you put silicone grease in your transistor and apply a good mica insulator in all of your transistor---------look for any burnt resistor or explosive capacitor -----check for scew tie your supply voltage to earth by wrong.

Aug 03, 2008 | NAD C320 2-Channel Amplifier

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