dieterboels
Member
I started recapping this Sansui AU101 of my father which really needed a revision.
Left channel went perfect, right channel not. Been searching for the problem a few days but still haven't found it. Hopefully anyone can help:
Started recapping the power amp and when trying that stage, resistor R282 fried. Looking around on the net it might be the fault of one of the transistors, but changing those didn't help, still fried the new resistors.
So to test the difference between left (working and recapped) and right (not working) I removed the four transistors TR806, TR808, TR810 and TR812 and the equivalents in the left channel. Plugged the amp and started measuring voltages at different points, both in the left and the right channel. I noticed that the voltage at certain points in the right channel was very low compared to the right. For example between R822 and diode D802 the voltage was 6V and in the left channel 44V (supply voltage = 44V). I suppose that there is a closed circuit somewhere, but I can't find where (tested so much connections, but without any luck).
Anyone an idea to continue my search for the problem?
Left channel went perfect, right channel not. Been searching for the problem a few days but still haven't found it. Hopefully anyone can help:
Started recapping the power amp and when trying that stage, resistor R282 fried. Looking around on the net it might be the fault of one of the transistors, but changing those didn't help, still fried the new resistors.
So to test the difference between left (working and recapped) and right (not working) I removed the four transistors TR806, TR808, TR810 and TR812 and the equivalents in the left channel. Plugged the amp and started measuring voltages at different points, both in the left and the right channel. I noticed that the voltage at certain points in the right channel was very low compared to the right. For example between R822 and diode D802 the voltage was 6V and in the left channel 44V (supply voltage = 44V). I suppose that there is a closed circuit somewhere, but I can't find where (tested so much connections, but without any luck).
Anyone an idea to continue my search for the problem?