Recapping SX-950

Discussion in 'Pioneer Audio' started by gmahoog, Apr 16, 2011.

  1. kevdubs

    kevdubs New Member

    Messages:
    47
    I have a paper schematic that came with the original unit, which is closer to the BOM list:

    Tone Amp Board (AWG-039)

    BOM list || Paper schematic | PDF schematic

    AWG-039: C13: 2.2uF 25v CSZA: 647-UKL1H2R2KDDANA 2.2uF 50v || 2.2/25 | 10/25
    AWG-039: C14: 2.2uF 25v CSZA: 647-UKL1H2R2KDDANA 2.2uF 50v || 2.2/25 | 10/25
    AWG-039: C15: 2.2uF 25v CSZA: 647-UKL1H2R2KDDANA 2.2uF 50v || 2.2/25 | 10/25
    AWG-039: C16: 2.2uF 25v CSZA: 647-UKL1H2R2KDDANA 2.2uF 50v || 2.2/25 | 10/25
    AWG-039: C19: 100uF 10v CEANL(NL): 647-UKL1A101KEDANA 100uF 10v || same | same
    AWG-039: C20: 100uF 10v CEANL(NL): 647-UKL1A101KEDANA 100uF 10v || same | same
    AWG-039: C21: 47uF 35v CEA: 667-EEU-FC1V470 47uF 35v || same | same
    AWG-039: C22: 47uF 35v CEA: 667-EEU-FC1V470 47uF 35v || same | same
    AWG-039: C23: 2.2uF 25v CSZA: 647-UKL1H2R2KDDANA 2.2uF 50v || same | same
    AWG-039: C24: 2.2uF 25v CSZA: 647-UKL1H2R2KDDANA 2.2uF 50v || same | same
    AWG-039: C25: .22uF 35v CSZA: 667-ECQ-V1H224JL2 .22uF 50v || same | same
    AWG-039: C26: .22uF 35v CSZA: 667-ECQ-V1H224JL2 .22uF 50v || same | same
    AWG-039: C29: 10uF 25v CSZA: 647-UKL1E100KDDANA 10uF 25v || same | same
    AWG-039: C30: 10uF 25v CSZA: 647-UKL1E100KDDANA 10uF 25v || same | same

    On the actual board, it looks like C13-C16 were all 2.2/50 though, which is weird. Also, there were two places where there was NO capacitor and just a little wire jumper, but I didn't have the foresight to write down which ones since I kind of ripped everything out en masse before I started. Oh well. Anyway, not sure how much it matters, just curious...
     
  2. rcs16

    rcs16 Super Member

    Messages:
    2,894
    Location:
    Baldwin, Ontario, Canada
    Take your pick

    C25,26 (0.22uF/35V,Electrolytic) CSZA 22K 35
    505-MKP2-.22/100/5
    505-MKP20.22/100/5
    80-R82DC3220DQ60J
    647-UKL1HR22KDDANA
    667-ECQ-V1H224JL(obsolete)
    667-ECQ-V1H224JL3(obsolete)
     
  3. supergilson

    supergilson Active Member

    Messages:
    243


    Why the capacitance change for C10? It's 470, but the link is 680.
     
  4. goat67

    goat67 AK Subscriber Subscriber

    Messages:
    3,347
    Location:
    Twin Cities MN
    I am not sure it may have been because the 470uf was not available. Increasing this cap to 680uf would not hurt it is used for filtering.
    But of course if you want to use a 470uf it is the speced part.
     
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  5. supergilson

    supergilson Active Member

    Messages:
    243

    My current (original) caps are measuring around 350uF at the moment.

    Would 647-UHE2A471MHD be a suitable replacement? I'm not an expert at picking replacements, but I have those particular ones in stock!
     
  6. supergilson

    supergilson Active Member

    Messages:
    243
    I have a few 647-UPW2A471MHD, also.

    They're both 470uF, 100V, but I'll be damned if I know what the difference is or if they will work here. That's why I like to get verification!
     
  7. goat67

    goat67 AK Subscriber Subscriber

    Messages:
    3,347
    Location:
    Twin Cities MN
    The diff between the UHE and the UPW is the UHE are long life these are usually a step up from the UPW for power supply filter caps
     
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  8. supergilson

    supergilson Active Member

    Messages:
    243
    Does that mean that 647-UHE2A471MHD be a suitable replacement for C10 on the power supply board?
     
  9. goat67

    goat67 AK Subscriber Subscriber

    Messages:
    3,347
    Location:
    Twin Cities MN
    Sure is
     
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  10. supergilson

    supergilson Active Member

    Messages:
    243
    647-LKG1H222MESCCK AWR-101 C12: 2200uF 35v ACH-039

    ...is not in stock. What would you recommend in its place? I do have several UPW1V222MHD6 in my inventory, or would I be just as well to leave the originals intact?
     
  11. goat67

    goat67 AK Subscriber Subscriber

    Messages:
    3,347
    Location:
    Twin Cities MN
    Researching
     
    Last edited: Sep 4, 2017
  12. goat67

    goat67 AK Subscriber Subscriber

    Messages:
    3,347
    Location:
    Twin Cities MN
    supergilson likes this.
  13. SaturationPt

    SaturationPt AK Subscriber Subscriber

    Messages:
    691
    Location:
    N.E. Indiana
    I'm going in to clean the speaker switches in my SX-950, and as many know you're deep enough that if you have the parts on hand, you might as well restore it electronically while you're in there.

    I have a late '77 receiver, and my boards are AWH-050-C, AWF-011-B, AWR-101-C, AE-066-D. Do these suffixes indicate that I will need to compare part-by-part that the BOM here matches my boards? I do not see any revised schematics on-line to lead me there either.

    TIA
     
  14. zebulon1

    zebulon1 Back repairing the PL's Subscriber

    Messages:
    3,994
    Location:
    Las Vegas Nevada
    A KEMET List of most of the Pioneer films:
    These are all 5mm leg spacing.

    80-MMK5104M50J01TR18, 0.1uf
    80-MMK5564M50J02TR18, 0.56uf
    80-MMK5224J50J01L4, 0.22uf
    80-MMK5474K50J01L4, 0.47uf
    80-MMK5334M50J01L4, 0.33
    80-SMR5105J50J0616, 1.00uf
     
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  15. mattsd

    mattsd AK Subscriber Subscriber

    Messages:
    1,488
    Location:
    Cincinnati, Ohio
    This is the list I'm using now, they are all poly stacked film as opposed to the wound style. All are 5mm lead spacing.

    80-F612JF104J063L, 0.1uF
    80-F612JF224J063A, 0.22uF
    80-F612JG474J063C, 0.47uF
    80-F612JM564K063C, 0.56uF
    80-F612JM684J063A, 0.68uF

    The 1uF is not stocked in a stacked film, I have used the PPS (Polyphenylene Sulfide) cap listed above and they sound good (better than a polyester or electrolytic), but are very pricey at $3.21 apiece.
     
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