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Pioneer SX-1980 restoration

Discussion in 'Pioneer Audio' started by ukza, Oct 17, 2018.

  1. ukza

    ukza New Member

    Messages:
    22
    Does anyone got a substitute for the 667-ECQ-V1H224JL on the power amp board? Its no more available.
     

     

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  2. kevzep

    kevzep Its all about the Music Subscriber

    Its a polyester stacked film capacitor 0.22µF 50V, just use another brand like kemet or Wima...
     
  3. ukza

    ukza New Member

    Messages:
    22
    Thanks a lot for your answer!
     
  4. ukza

    ukza New Member

    Messages:
    22
    In the photo attached there I think I can see the zener diodes 17 + 18V (yellow circle), but the zener (red circle) should actually be next to this, or am I wrong?
     

    Attached Files:

  5. kevzep

    kevzep Its all about the Music Subscriber

    As far as I can tell, it is next to it?
    What are you trying to work out?
     
  6. ukza

    ukza New Member

    Messages:
    22
    The 2 diodes supposed to be the Zeners and they soldered in next to the Zener o_O
     

     

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  7. zebulon1

    zebulon1 Getting behind on work. I need help? Subscriber

    Messages:
    4,852
    Location:
    Las Vegas Nevada
    It's a service letter mod requiring the single 32v zener to be replaced with two. A 17v and a 18v.

    From a MTF post:
    Here is a link that has information in Audiokarma:
    http://www.audiokarma.org/forums/showthread.php?p=1182717

    I hope these parts numbers from US supplier mouser.com help you find suitable replacements in your area.
    these are just for the factory SX-1980

    These are all the diodes, both the original part number, and a replacement with identical specifications:

    D210 wz-240 >> 512-1N5252B Fairchild 24 V, 0.5W Zener diode 5 percent $0.06
    D211 wz-240 >> 512-1N5252B Fairchild 24 V, 0.5W Zener diode 5 percent $0.06
    D213 EQA01-35R 35 volt 5 percent 0.5 watt zener diode. replace with two diodes:

    D213 >> (#1 of 2) 512-1N5247B Fairchild 17 V, 0.5W Zener diode 5 percent $0.06
    D213 >> (#2 of 2) 512-1N5248B Fairchild 18 V, 0.5W Zener diode 5 percent $0.06
    OR
    D213 >> (#1 of 2) 512-1N4744A Fairchild 15 V, 1W Zener diode 5 percent $0.08
    D213 >> (#2 of 2) 512-1N4747A Fairchild 20 V, 1W Zener diode 5 percent $0.08
    I'm not sure what EchoWars recommendation is... the 0.5w vs 1w isn't clear
    and I didn't find 17v 1w zeners either... so 20+15 is closest

    D215 1S2473 >> 512-1N4148 Fairchild Diodes - Small Signal 100V Io/200mA $0.03
     
  8. markthefixer

    markthefixer On Hiatus, dealing with Dad's estate full time Subscriber

    Messages:
    21,088
    Location:
    Bensenville,Illinois
    EDIT: YIKES THE PICTURE IS BAD!!!!!!!!!!!!!!!! THE ZENER STRING IS IN THE WRONG, D215 POSITION!!!

    YELLOW circle should show D215 1s2473 (reverse polarity protection during shutdown / powerup IIRC) to 512-1n4148(iirc?)


    RED circle D213 originally eqa 01-35R a 35v 1/2 watt zener diode

    FACTORY CHANGED D213 from 1/2 watt 35v zener to a series string of a 17v and a 18v 1/2 watt zener.
    35v zeners were pushing the technology at that time, and the replacement pairing of the 17 and 18 are
    quieter and more stable even today - if you can FIND a 35v zener.
     
    Last edited: Nov 6, 2018
  9. ukza

    ukza New Member

    Messages:
    22
    If in my yellow circle the diode is the 215 why is there 2 soldered together.
    Im confused, sorry if I don’t get it
    D210 and 211 anyway go out due to the cs
     
    Last edited: Nov 6, 2018
  10. zebulon1

    zebulon1 Getting behind on work. I need help? Subscriber

    Messages:
    4,852
    Location:
    Las Vegas Nevada
    The Service Letter has been complied with.
    Mark explained it in his post above.
    Correct :thumbsup:
     
  11. markthefixer

    markthefixer On Hiatus, dealing with Dad's estate full time Subscriber

    Messages:
    21,088
    Location:
    Bensenville,Illinois
    OOPS

    Where did that picture come from (rhetorical question)?
    Now I gotta weed out my pictures...


    ...... and... I can't find a bad one (yet)
     
    Last edited: Nov 6, 2018

     

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  12. mattsd

    mattsd AK Subscriber Subscriber

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  13. pauls1

    pauls1 Active Member

    Messages:
    131
    Location:
    Essex, UK
    I could be. I still have a 1980 with a bad board
     
  14. omri617

    omri617 Super Member

    Messages:
    1,158
    Location:
    Israel

    Me , just in case...
     
  15. ukza

    ukza New Member

    Messages:
    22

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