Question about Televison & Video
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Posted on Jan 02, 2017
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
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
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 )
they should be replaced in pairs
Posted on Mar 04, 2011
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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