Buzzing from my Amplifier?

Discussion in 'Solid State' started by Djanvk, Jan 7, 2017.

  1. Djanvk

    Djanvk New Member

    Messages:
    40
    Location:
    Northern Illinois
    I have a Yamaha CA-810 amp and it's buzzing through the speakers no matter what input I put it on, I can't figure it out. I've disconnected and reconnected everything but can't get it out.

    Any help?
     
  2. petehall347

    petehall347 the brandy coffee man Subscriber

    Messages:
    22,775
    Location:
    uk.. the middle bit
    try it with speakers only
     
  3. Binkman

    Binkman Addicted Member

    Messages:
    5,713
    Location:
    Raleigh, NC
    Long shot.. have checked ac cord quality... bent pins on input output? Shut down and start up still 'buzz'?

    if no scope and it's loud.. if's probably off the p.s and or ground related coming back in from one channel or another into the audio path. aside from full diagnostics a diode can have gone bad. an scr could do same. commonly found in the ps regions. or in the output.. dead short transistor not dead yet? then cut power then nothing at restart? yeah the transistor is dead and maybe some more stuff.
     
    Oldsansui441 likes this.
  4. mbz

    mbz Well-Known Member

    Messages:
    578
    Location:
    Melbourne, Victoria
    Are both channels affected?
    Buzz still present if volume set to zero?
    Tried using the 810 as a seperate, ie, do you have other gear (preamp and power amp)
    so you can test the 810 pre then power stage separately
     
    Oldsansui441 likes this.
  5. NAD80

    NAD80 Well-Known Member

    Messages:
    943
    Location:
    Carlisle PA
    Hello Djanvk. Welcome to AK. the Service Manual is at HiFi Engine.com. Just register and download for free. Could be in the PS.
     
    Oldsansui441 likes this.
  6. Djanvk

    Djanvk New Member

    Messages:
    40
    Location:
    Northern Illinois
    Both channels are affected, and the buzz is still there with volume at zero. I did hear that is could be a bad capacitor, is that a possibility?
     
  7. mbz

    mbz Well-Known Member

    Messages:
    578
    Location:
    Melbourne, Victoria
    Yes a bad cap could cause this, so could about 5-10 other things. Most probable is in the power supply area but could be something else.
    You should download the service manual, hifiengine is safe, you will need to create an account. Need some feedback on your skills level
    and tools available (multimeter?, are you confident taking voltage measurements on a live amp?). As a first step you should first disconnect
    the amp from all power/remove power plug and remove the outer case. Inspect what components you can, taking photo's of any suspect
    parts. The main candidates are the capacitors, look for any shape distortion or leakage (not to be confused with glue). Start with the main
    filter capacitors (12000uf/58V from manual)
     
    Oldsansui441 likes this.
  8. Oldsansui441

    Oldsansui441 AK Subscriber Subscriber

    Messages:
    947
    Location:
    Victoria, Australia
    As the guys have said above, if in both channels it is likely a bad cap on the power supply or an earthing problem.
     
    mbz likes this.

Share This Page