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sx-580

  1. mistahke

    SX-580 No stereo LED (and other small details)

    Hello everyone, Let me introduce the problem a bit. Last summer I bought SX-580 at a kinda garage sale. It was waiting for it's turn to be fixed (I repair things as a hobby) and so now is the time. Initially it didn't start, there was no sound, one channel was getting high (on the meter). After...
  2. S

    Pioneer SX-580 No Audio with power right power meter on max

    Hello, I have a pioneer SX-580 that has been working for years. Recently the speakers stopped working and it seems that only the left A channel works. The two 4A fuses were blown and when replaced the watt meters jumped around and the right one stayed just over half way. The power ICs were...
  3. J A

    SX-580 120hz hum

    I've been digging around the forums and I think this is power supply related based on what I'm seeing. I have a 120hz hum (spectrum analyzer confirmed) from both speakers. It is not influenced in any way by volume, input changes, or switching channels. The only time it stops is disengaging...
  4. RobbySX

    Pioneer SX-580 audio issue

    Recently I was passed down a 580 that’s been sitting in a closet for I don’t know how long. Cosmetically it looks great, I’m not much of a electronics expert unless you’re talking cars. Anyhow the issue, it powers on lights up and all, however the volume (both channels) is super quiet, with that...
    • RobbySX
    • Thread
    • both channels hum noise low volume pioneeer sx-580
    • Replies: 28
    • Forum: Pioneer Audio
  5. goldswimmerb

    SX-580 Rail on output

    Hey guys, I have recently come into possession of an SX-580 that has issues, at first I had no sound at all, and negligible DC at the terminals, which I traced down to R401 (33ohm) being open in the power supply. After swapping that resistor out I now have a new issue (well, one that was...
  6. dlucy

    Can a bias adjust be added to SX-580 at the 2SA798 pair?

    I've read more than a few threads here about SX-580's (and SX-680's, too, I think) where someone asks "where is the bias adjust" and several chime in "there is none, that's what you get in a BOTL". Looking at the schematic, isn't it possible to add a bias adjustment to the two dual-transistor...
    • dlucy
    • Thread
    • pioneer pioneer sx-580 sx sx-580
    • Replies: 13
    • Forum: Pioneer Audio
  7. dlucy

    Recap, restore, restomod a SX-580

    I've started prep work for returning a SX-580 to another 30 years of service. I've got some snippets from other threads to use as the basis for the BOM, but I'll update those here with what I find in this unit and what others have mentioned or corrected along the way.
    • dlucy
    • Thread
    • pioneer pioneer sx-580 recap restoration sx sx-580
    • Replies: 3
    • Forum: Pioneer Audio
  8. le0pard13

    SX-580 radio signal bleed to phono stage

    Greetings. Short-time lurker, first-time poster, here. Recently, my steadfast little Pioneer SX-580 has developed a strange radio signal bleed to its phono stage. I've a Dual 1249 turntable connected and in-between tracks, if I have the volume up, the nearby (2.5 miles away) FM station KJLH...
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