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Cyrus one resistor starts smoking
#1
Video 
Hello everybody,
I am completely going crazy with this amplifier and need experienced help.
The problem:
I got this Cyrus One amp with a broken channel which starts working when the volume is turned up half the way. It still has a lot of distortion after that.
After opening i saw that the fusible resistor R97 was burnt. I tested all the caps and changed them because there were a lot of them off. After changing the resistor i powered it on and tested everything. It performed really good on the oszilloscope until it started smoking again after turning the volume a little bit up. After that i checked all the power transistors which were good. Now when i turn it up the fusible resistor r 93 also gets way too hot until it smokes. Please help me find the problem.
[Bild: IMG-5471.jpg]

[Bild: IMG-5472.jpg]

[Bild: IMG-5474.jpg]
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#2
Check for DC on the output and check if quiescent current is correct. You can compare with working other chanel. If quiescent current is too high, check transistors of the VAS. Difficult to say what happened without some particular measurements. Quiescent current ist adjusted with different resistors in this model.
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