Audio Discussion > DIY

Sansui 9090 Circuit Board repair

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Tiga:
The unit goes into protection mode immediately when you power on - once you remove the driver board it comes out of protection.  Doing some internet research shows this issue is pretty common with this model and the majority of the time it's the resistors on the board that fail open or go way out of tolerance.   

OCCD:
It sounds like output transistors may also be a possible problem. Check for a shorted output.

Tiga:
Does testing the transistor require special equipment to test?  Another question - if the output transistors are bad would the unit come out of protection when the driver board was removed?  Sorry for the newb questions.  Thanks guys.
Dave

OCCD:
Yes, removing the driver board can make the unit come out of protection. You can test with a meter.

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