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SANSUI AMP AU-D11-II

TOOK THIS TO A LOCAL TEC. AND WAS TOLD THAT THE PROTECTOR CIRCUIT WAS BAD AND THAT IT WAS A FACTORY FIX.. WHEN TURNED ON THE LIGHT COMES ON AND THEN BLINKS RAPIDLY BUT THE SYSTEM DOES NOT START. I KNOW THE UNIT USE TO CLICK WHEN THE LIGHT WENT OUT. COULD THE SWITCHES BE BAD OR IS IT THE CIRCUIT PRIOR TO THE SWITCHES. I HAVE A SCHMETIC OF THE AMP BUT IT WON'T TROBLE SHOOT. ANY HELP WOULD BE APPRICIATED. THANKS DG

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The D11 is a complex amp in its circuitry. It employs Sansui's x-balanced system. You need to clean the output relays and check the offset and bias (a multi-step process that is not possible without the service manual).

Posted on Dec 14, 2008

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It is possible, but nlikely that the protection circuit is bad. More common are shorted output transistors or defective driver stage transistors. This should not be a difficult repair for anyone familiar with audio amps. Unsolder/remove Q22 and Q23 and measure the voltages at each of the 3 pads per transistor and post them here.

Thanks,
Dan

Posted on Nov 05, 2008

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Au sansui d607x


If the speaker protection is activated then this would indicate that either a dc voltage is appearing across the speakers or a short circuit on one or more speaker cables. Since you are able to get normal sound through the headphone function the former is less likely and you should check for a possible shorting speaker cable. Another possible cause for the symptoms can be dry joints on the speaker protection relays.
regards from Vintie

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This place has some.

http://angela.com/

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1 Answer

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GOOD LUCK
BIGRED

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