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Old 09-15-2017, 12:56 AM   #67
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Default Re: Pioneer VSX-520-K Protection problem

Originally Posted by rievax_60 View Post
Also check the Base voltages of Q443 and Q444. ZD410 should have about 5v across it. The combined voltage across R531 and R706 should be about 4.4v.
Have you replaced ZD410 with a 5.1v zenner diode? Are R531 and R706 ok?
R531 and r706 are ok .voltage accrose zd410 is 4.47 volt that is same on other channel also base voltage of q443 and q444 are same its -3.1volt but in other channel its 0volt
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