Scored a Sansui 790

Discussion in 'Exclusively Sansui' started by Belo, Apr 11, 2016.

  1. Belo

    Belo Well-Known Member

    Messages:
    504
    Location:
    Rio de Janeiro, Brazil
    I wasn't looking for anything special, I wasn't even planning to buy anything but as soon as this guy listed it for sale for 85 dollars I decided to buy it.
    The only down side to it is that the signal meter and fm stereo lamp aren't working.
     

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  2. MER71

    MER71 Well-Known Member

    Messages:
    626
    Location:
    Lancaster county, Pennsylvania
    Call the cops! You just robbed him.
     
    Belo likes this.
  3. Daunia 70

    Daunia 70 Lunatic Member

    Messages:
    12,646
    Location:
    Britain
    Very nice... at that price you just can't go wrong!
     
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  4. LBPete

    LBPete Rolling Along Subscriber

    Messages:
    10,130
    Location:
    Long Beach, CA
    That's quite a find. I like the black faced versions. The signal meter lamp is an ordinary fuse lamp and is fairly easy to replace. The stereo lamp may take a little diagnosis. You have to determine if it's the bulb or the source voltage to the bulb. You can check that voltage with a DC voltmeter across the bulb. Then tune across a strong stereo station and look to see if the voltmeter reads.

    - Pete
     
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  5. Belo

    Belo Well-Known Member

    Messages:
    504
    Location:
    Rio de Janeiro, Brazil
    I got the FM stereo lamp to work, i tinkered with it a little and it came on I guess it came loose when I took it home, all I've got to do now is see why the signal meter doesn't move.
     
  6. LBPete

    LBPete Rolling Along Subscriber

    Messages:
    10,130
    Location:
    Long Beach, CA
    I miss understood. I thought the two lamps were out. The signal meter is going to be a little more work. Like the stereo lamp, you can put a DC voltmeter across it and see if it registers a voltage when you tune across stations. That will tell you if the meter itself has failed or if the tuner is not putting out the signal.

    - Pete
     
  7. Belo

    Belo Well-Known Member

    Messages:
    504
    Location:
    Rio de Janeiro, Brazil
    These past two weeks I had a lot of work to be done, so I'll get around to verifying the meter this weekend.
     
  8. Belo

    Belo Well-Known Member

    Messages:
    504
    Location:
    Rio de Janeiro, Brazil
    What level of voltage should I look for?
     
  9. LBPete

    LBPete Rolling Along Subscriber

    Messages:
    10,130
    Location:
    Long Beach, CA
    I'm not sure of the voltage value probably 6 to 12v DC. The value is not that important. Just check to see if it's there when you tune across a strong FM stereo station and not there when not on a station. This voltage is controlled by transistor TR8 on the tuner board.

    - Pete
     
  10. Belo

    Belo Well-Known Member

    Messages:
    504
    Location:
    Rio de Janeiro, Brazil
    Pardon for taking so long to reply, I tested the voltage with a strong station tuned in and got 2.4V.
    I guess this meter is history.
    I saw one for sale on ebay, gonna give it a try.
     

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