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yamaha cr-640

  1. Bryan Whitak

    Power Transformer For CR-640

    I've had my Yamaha CR-640 for probably 17 years now and it hasn't worked for over 10 years. It started blowing fuses. I would replace a fuse and it would instantly blow. Long story short, I have no idea how to fix these things, but recently a retired electrician contacted me and told me he...
    • Bryan Whitak
    • Thread
    • power transformer yamaha cr-640
    • Replies: 10
    • Forum: Yamaha
  2. D

    Yamaha CR-640: Lights Up, Relay Click, Occasional sound drop unless I bump it

    Hi all, I have been a lurker for some time and finally decided to seek help. I recently purchased a Yamaha CR-640 in near mint condition. Plugged into my Sansui SP-2000, beautiful sound and never had a problem. As a son of an audiophile, I always appreciated the warm Yamaha "smell" in our...
  3. J57LITTLE

    Yamaha CR-640 Repair

    Greetings, I am new to the forum, but with help I've already received from AK I was able to return a Yamaha CR-640 to life. There's still some work to do, but I got it up and running...for a while. When I inherited this unit, I could not power it on. My 300W bulb tester lit up like a roman...
    • J57LITTLE
    • Thread
    • protection circuit issues yamaha cr-640
    • Replies: 25
    • Forum: Yamaha
  4. wa27

    CR-640 tuning meter not deflecting

    I've got a CR-640 and the tuning meter hardly moves at all. I've read that the deflection on these is always lower than you'd expect, but there is obviously something wrong with mine. It deflects about 1 mm either way. I can tell it's working to some extent, because I can still use it to "dial...
    • wa27
    • Thread
    • yamaha cr-640
    • Replies: 3
    • Forum: Yamaha
  5. C

    Yamaha CR-640: Lights up but no sound.

    Hi AudioKarma, I am not a very smart man. I was recently gifted my father's Yamaha CR-640. The unit sounded great, it was just missing some lamps. I got replacement lamps today and replaced all four above the tuner. Now, this is where I made a HUGE mistake... I turned the unit on to make sure...
    • ChuckSunset
    • Thread
    • help! no sound receiver troubleshooting yamaha yamaha cr-640
    • Replies: 24
    • Forum: Yamaha
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