Another Pioneer SX 1250 restoration

Discussion in 'Pioneer Audio' started by boris_CH, Jul 17, 2017.

  1. boris_CH

    boris_CH New Member

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    Switzerland
    Not yet - waiting for some parts...
     
  2. boris_CH

    boris_CH New Member

    Messages:
    42
    Location:
    Switzerland
    Hey guys, the SM listed some diodes I don't know the appropriate replacement.
    1S1886 - that's 200V, 1 A, right? But what about those LFSM, VF, IR,... parameters? I don't know exactly what to choose. Is THAT an appropriate replacement?

    Same is for the other codes. Don't know exactly what to choose.
    1S2076
    1S2471
    SIB01-01
    SIB01-04

    Any help is appreciated :)
     
  3. rcs16

    rcs16 Super Member

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    Location:
    Baldwin, Ontario, Canada
    A 1N4835 is a fast recovery diode, note the trr spec. The Peak reverse voltage is 200V. It is an upgrade to a 1S1886. Most of those diodes you can find data sheets on the web for them.
    As for the other specs. It says it in the data sheet,
    LFSM: Non‚ąíRepetitive Peak Surge Current (Surge applied at rated load condition)
    Vf: forward voltage at a specified DC current
    Ir: Reverse leakage current at a specified voltage.
     
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  4. boris_CH

    boris_CH New Member

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    Ok - had a look at the available datasheets. Not that easy for me, but I try to understand that stuff. I could not find the trr spec for the 1S1886. Talking about an upgrade means I can use the "faster" replacement? Could someone crosscheck if the other replacement types I tried to identify are correct? Thanks in advance :)
    1S2076 - that?
    1S2471 - that?
    SIB01-01 - that?
    SIB01-04 - that?
     
  5. Hipocrates

    Hipocrates Anti-Muppet Subscriber

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    Last edited: Aug 6, 2017
  6. boris_CH

    boris_CH New Member

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  7. boris_CH

    boris_CH New Member

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    Just a small progress. Ordered parts for the 3rd time and always miss something. Of course you got the min. order quantity otherwise some massive shipping costs... However. Most of the caps and transistors changed and back in place. Off to order no. 4...
    IMG_0623.JPG
     
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  8. boris_CH

    boris_CH New Member

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    Ok, my Chinese caps just arrived. Packaging was horrible, so one piece got a dent, but nothing too serious...
    IMG_0627.JPG
    Measurement within the tolerance range...
    IMG_0628.JPG
    IMG_0629.JPG
    IMG_0630.JPG
    IMG_0631.JPG
     
  9. tsd71

    tsd71 RIP Tom Petty Subscriber

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    These caps are 50mm wide your gonna have to widen them at the bottom to make them fit in the 1250 clamps
     
  10. boris_CH

    boris_CH New Member

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    Location:
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    Old caps still in excellent condition... Guess there is no reason to replace them?

    IMG_0652.JPG

    What about the 2nd relais, should I change it?

    IMG_0653.JPG
     
  11. tsd71

    tsd71 RIP Tom Petty Subscriber

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    I usually just replace the relay on the protection board, if the soft start works properly maybe just pop it open and Deox the contacts.
     

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