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nathan911
Joined: 15 Oct 2011
Posts: 4
Location: israel
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 Posted: Wed Feb 22, 2012 8:00 am Post subject: repairing an old sansui amplifier |
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hello every one ,
new member here and also newby in the electronic repair
i have an old sansui vx-a711 amp that accidently sorted a speaker wire
since then gets in protect mode .
after opening it i replaced two shorted output transistors and the two main 10000uf caps (one seemed blown) - now still in protect mode
i noticed that when i disconnect one of the transformer outputs it gets out of protect and i don't know if the transformer is faulty or the protector board
(the output i disconnect is around 45v)
will appriciate any suggestions
thank you all and have a great day!
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nathan dray
YNG audio &video |
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nathan911
Joined: 15 Oct 2011
Posts: 4
Location: israel
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| Posted: Wed Feb 22, 2012 8:11 am Post subject: mistake |
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sorry the model is: AU-X711
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nathan dray
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jts1957
Joined: 24 Nov 2008
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Location: Far, Far Away
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| Posted: Wed Feb 22, 2012 5:03 pm Post subject: |
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thanks
. in the manual it says it sould be 46v so i think the transformer is o.k
i guess the problem is in the power supply circuit or the protector circuit, just don't know what to look for.
any idea? |
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jts1957
Joined: 24 Nov 2008
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| Posted: Wed Feb 22, 2012 5:23 pm Post subject: |
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Which transformer?
I should have specified speaker relay pins.
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nathan911
Joined: 15 Oct 2011
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jts1957
Joined: 24 Nov 2008
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| Posted: Fri Feb 24, 2012 3:37 pm Post subject: |
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Which two output transistors?
Is there any voltage on the switch contacts of either speaker relay? Each relay should have 2 switch contacts and 2 coil pins.
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| Posted: Fri Feb 24, 2012 4:02 pm Post subject: |
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just when the 46v output is disconected and i turn it on, i can clearly hear the relays
working |
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