Realistic STA-65D no sound output

Discussion in 'Solid State' started by luaplerog, Feb 11, 2019.

  1. luaplerog

    luaplerog Member

    Messages:
    84
    I just bought a sta-65d online. The seller said it was fully functional and tested it.. I plugged it in but am not getting any sound output at all (other than the occasional popping/crackle from my speakers)...I contacted him and he said that everything worked perfectly prior to shipping. The receiver is very clean and I'm not sure where to go from here...Any suggestions on what I should check?

    Thanks!
     

     

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  2. mbz

    mbz Super Member

    Messages:
    2,444
    Location:
    Melbourne, Victoria
    Start with the basics. AUX/CDP as input, try speaker set A then B, also try with headphones.
    Verify Tape Monitor switch correctly set to off or source. I didn't see and PRE-OUT/MAIN-IN
    so not a missing link. Odd that both channels down, next step would be to verify power
    supply is ok, if you have a multimeter and basic diy skills.
     
  3. luaplerog

    luaplerog Member

    Messages:
    84
    So I left it powered on for about 10 mins and now there seems to be sound. It's a little distorted, but its working...Is this normal? It had to warm up? I've never had a receiver do this...
     
  4. mbz

    mbz Super Member

    Messages:
    2,444
    Location:
    Melbourne, Victoria
    No, I wouldn't call the 10min wait normal. Suggest a tired component eg, cap, transistor,,, might even be a dry solder joint
    (goggle for pix)

    It's saying that it needs some care/refurbishment. Maybe monitor the situation, certainly check the bias as a basic health check.
    Also physically inspect the amp for any stressed caps (bulging/receeded sleeves) and resistors.
     
  5. luaplerog

    luaplerog Member

    Messages:
    84
    I'll look into it. I'm not sure tech savy so I need someone to walk me through. No bulging/receeded sleeves or anything that looks burnt, leaky, etc...The audio sounds pretty distorted though.
     
  6. mbz

    mbz Super Member

    Messages:
    2,444
    Location:
    Melbourne, Victoria
    Do you know how to check the bias?
     

     

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  7. luaplerog

    luaplerog Member

    Messages:
    84
    No. I'm not that tech savy. But I can follow instructions if you feel like walking me through it. haha
     
  8. mbz

    mbz Super Member

    Messages:
    2,444
    Location:
    Melbourne, Victoria
    You will need a multimeter and ideally some mini-grabbers, prefer not to use aligator clips due to the amount of bare metal.
    Need to measure the dc voltage across R617, it will be a larger white resistor near the heat sink. Mini-grabber on each side,
    it will be in the mV range. Repeat for the right channel. Download the service manual/schematic from hifiengine, you need to
    register, it's safe no spam etc...
     
  9. luaplerog

    luaplerog Member

    Messages:
    84
    I'm registered on hifiengine and I have a multimeter. I'll look into this tomorrow after work. Thank you for your help. I really appreciate it.
     
  10. century tek

    century tek Super Member

    Messages:
    3,685
    Location:
    The Evergreen State
    Wiggle the tape monitor switch. Also, its possible that all it needs is to have the pots and switches cleaned.
     

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