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bad transistor

  1. ocdecio

    Marantz 240 - bad transistor?

    I am chasing a high DC voltage at the left amp board on a 240, so I am checking each of the listed transistors in the SM list. When I pulled Q508 (SJ2582) this is how the collector looks like: Of course I will replace it, although the tester shows normal parameters and the DMM test passed as...
  2. D

    Yamaha CR-220 Noise and popping after unplugged

    I could use a bit of help on this as I work on repairing this CR-220 I have have since about 1980. A year ago, I heard a pop from the right speaker in the middle of the night that woke me up. The unit was turned off when this happened. I noticed on follow up that it would pop occasionally when I...
    • DoctorDoug
    • Thread
    • bad caps bad transistor cr-220 distortion low volume noise
    • Replies: 43
    • Forum: Yamaha
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