I have Sansui amplifier AU9500,, no sound, I found fuse 2 amperes, 7 amperes burns, I found too 3.3 uf 100 volts completly bulging under driver board, 1 transistor output 2SA679 shorted,and I found too the 4 capacitors 4700UF 63 volts they have not good value, I changed all these components and one of 2 capacitors 3.3 uf 100 volts is going very hot after 30 seconds, do I have power supply problem?
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Sansui AU9500, capacitor blows
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Re: Sansui AU9500, capacitor blows
A 7 ampere fuse burns out, too, when rated for only 2 amperes? Sounds like a bad transistor to me! (besides the bad caps, of course!)ASRock B550 PG Velocita
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Re: Sansui AU9500, capacitor blows
hold on a bit .. no way too much voltage got the 100v cap hot . 3.3uf isnt a value in that amp as far as i can see .. if you cant work out board designator id tell us what it connects to . and if there are holes in the board for it . it is possibly a late addition from factory .
some nice pictures will help .Last edited by petehall347; 07-30-2021, 06:53 PM.
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Re: Sansui AU9500, capacitor blows
I check voltage on the 2 electrolytics and it seems normal one gray wire have -49 volts and the other with yellow wire have +49 volts , they connect directly on bridge rectifier, I try to switch on amplifier and I remark distortion on one channel and after 1 minute the capacitor goes very hot
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