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Sansui 7070 “ Just Take It”

Discussion in 'Exclusively Sansui' started by Dave1384, Oct 13, 2018.

  1. Dave1384

    Dave1384 Stuck in the 70's

    Messages:
    3,361
    Location:
    Suburban Philadelphia
    What am I doing in the Sansui forum ?
    Anyway , it’s raining some , but there’s a yard sale nearby in a nice area so I’ll go. Nice stuff . There’s 4 gals running it . I pick up an old aquarium light , one of them asks “ Do you like electronics”? Well do have any old audio gear ,? I pose the question .. “
    She stares ahead ..” Yeah I do , We don’t use it anymore. Come downstairs”. .
    This one was on its side . She thought it might have been a Kenwood. “Just take it”.
    I lug it upstairs, there’s a box of cords , speaker wire and such . The speaker wire leaves with me .
    I can’t just take this ... husband doesn’t even look up. I throw her a 10 for her kindness .
    She’ll look for the manual, too.
    First a Pioneer , now this one.
    Fixed the two blinking lamps with some DeOxit .
    Volume sometimes fades away to silence when played at a low volume. What would cause that?
     

    Attached Files:

    Last edited: Oct 13, 2018
    tnsilver likes this.

     

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  2. KingBubba

    KingBubba "Too Much Stuff" Subscriber

    Messages:
    9,796
    Location:
    Brooksville, Fl.
    I have one and it sounds great. My only complaint is that it has no pre out/amp in.
     
  3. Blue Shadow

    Blue Shadow I gotta get me a new title

    Messages:
    21,015
    Location:
    SE PA
    Good looking unit
     
  4. Kevin D

    Kevin D AK Subscriber Subscriber

    Messages:
    862
    Location:
    Buffalo Grove, Illinois
    Very nice!
     
  5. rickb119

    rickb119 AK Subscriber Subscriber

    Messages:
    202
    Nice score!

    I'd start by cleaning all the pots and switches with deoxit contact cleaner. (With the unit unplugged of course.)

    EDIT: Never mind. Just re-read your post.
     
    Last edited: Oct 13, 2018
  6. Sansui77

    Sansui77 Khosaku Kikuchi's Grandson Subscriber

    Messages:
    564
    Location:
    Australia
    Nice score. You might start to like the Sansui sound and explore other models ;)
     

     

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  7. avionic

    avionic " Black Knights " Subscriber

    Messages:
    42,959
    Location:
    Fort Dodge, Iowa
    Does the volume return if you crank up the volume? If so. Protect relay, cold solder connection or dirty speaker select switches.
     
    Last edited: Oct 13, 2018
  8. Dave1384

    Dave1384 Stuck in the 70's

    Messages:
    3,361
    Location:
    Suburban Philadelphia
    Yes
     
  9. avionic

    avionic " Black Knights " Subscriber

    Messages:
    42,959
    Location:
    Fort Dodge, Iowa
    Protect relay contacts or solder connections or dirty speaker select switch.
     
    slimecity likes this.
  10. sansui 74

    sansui 74 Active Member

    Messages:
    110
    Location:
    Seattle Wash
    Nice score, try deOxit the loudness switch and operate the switch 20 to 30 times.
     
  11. Dave1384

    Dave1384 Stuck in the 70's

    Messages:
    3,361
    Location:
    Suburban Philadelphia
    I’ve hit the speaker selector switch . Twice .
    Is the relay right by the on/ off button .? I didn’t hit that . I’ll try the loudness switch too .
     

     

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  12. avionic

    avionic " Black Knights " Subscriber

    Messages:
    42,959
    Location:
    Fort Dodge, Iowa
    What are you refering to? The slight delay before the "click"? What I'm refering to is carboned up/pitted relay contacts.
     
  13. avionic

    avionic " Black Knights " Subscriber

    Messages:
    42,959
    Location:
    Fort Dodge, Iowa
    When it starts to fade at low volume. Tap on the relay cover.And note any change in sound volume or quality.
    The telltale symptom of a relay issue.80-90% of the time
     
  14. Dave1384

    Dave1384 Stuck in the 70's

    Messages:
    3,361
    Location:
    Suburban Philadelphia
    I'd do that if I knew what the relay looked like.
    I'll go find it.
     
  15. avionic

    avionic " Black Knights " Subscriber

    Messages:
    42,959
    Location:
    Fort Dodge, Iowa
    I believe its located under that black center cover........Standby
    [​IMG]
     
  16. avionic

    avionic " Black Knights " Subscriber

    Messages:
    42,959
    Location:
    Fort Dodge, Iowa
    Located on the F-2625 board and likely looks like this.
    [​IMG]
     
    Hyperion likes this.

     

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  17. Hyperion

    Hyperion Roobarb & Custard Subscriber

    Messages:
    47,403
    Location:
    Hertfordshire, UK
    Correct^^^ it is labelled RL01, and can be seen on the board layout diagram on page 8 of the Service Manual.
     
  18. Dave1384

    Dave1384 Stuck in the 70's

    Messages:
    3,361
    Location:
    Suburban Philadelphia
    This ?
    says RABK 2 B on the plastic cover .
    That thing needs deoxit ? It’s covered .Does it even come off ?
     

    Attached Files:

    Last edited: Oct 15, 2018 at 5:21 PM
  19. toxcrusadr

    toxcrusadr AK Subscriber Subscriber

    Messages:
    32,380
    Location:
    Central Missouri
    So, is there any way to clean these relays or is it a replacement? I have a similar problem with an NEC preamp. At low volume one channel can drop out, I crank up the volume and it comes back. It's all logic controls, no physical speaker selector or source switches on the front, just pushbuttons that scroll through the choices. This relay problem sounds like the culprit.

    Sorry for the tangent, or maybe hopping onto your wagon is a more appropriate term.
     
    Dave1384 likes this.
  20. avionic

    avionic " Black Knights " Subscriber

    Messages:
    42,959
    Location:
    Fort Dodge, Iowa
    That would be it. The plastic cover will come off. But not real easily. Did you try the tapping that I suggested ?
     

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