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pa3004

  1. nsun

    Voltage regulator SA 7700

    Hi! Im new here, need some help with an SA 706 (SA 7700) This European version is on 240 V (or 220V) The protection relay doesn,t engage, and when I measure pin 1 its only 5,3 V... So I suspect something in the 13 V regulator, or before that. The output from trafo is 68,7 VAC (TP 12 - TP 13) or...
    • nsun
    • Thread
    • pa3004 pinoeer sa 706 sa 7700 sa-706 sa-7700 voltage regulator
    • Replies: 15
    • Forum: Pioneer Audio
  2. F

    PA3004 chip PCB substitute

    Hi All I'm soldering the Diy PA3004 chip PCB substitute, and can anyone confirm which is Q1 & Q7 lol Is Q7 the highlighted one ?? Thanks
  3. Pageplayer

    SX-1980 PA3004 Shot?

    I have fully recapped this unit and installed a Delta9 Electronics populated power supply. All is good except when powering the unit on. I am seeing power meters jump up to the 0.1 watt area once the protection relay clicks and then the meters settle back to zero. I also notice the protect relay...
  4. Ray66

    SX980 with PA3004 chip PCB substitute

    An SX980 that I’m restoring has a problem with the protection board where the relay does not energize. I believe the problem is with the PA3004 IC so went ahead and replaced the it with the ‘substitute PCB’ designed by merlynski and alexhastings (see PA3004 chip PCB substitute). A big thanks to...
    • Ray66
    • Thread
    • pa3004 pioneer protection protection circuit
    • Replies: 33
    • Forum: Pioneer Audio
  5. Mike Scaggs

    SX-780 Issues / PA3004?

    First post here so thanks in advance. I am a tube amp tech and have recently started learning some new things with my Pioneer SX-780. So I am have an issue that I so far cannot seem to find the problem. I bought a restore kit and have done all the work so far, still no love. I sure would...
  6. merlynski

    Pioneer PA3004 chip PCB substitute - link

    Here is a link to an open source replacement pcb for the Pioneer PA3004 Protection SIP. It is available with Gerbers, Eagle files and BOMs for both SMD and Through hole versions. This is collaborative project by AK members. PA3004 chip PCB substitute | Audiokarma Home Audio Stereo Discussion...
    • merlynski
    • Thread
    • pa3004 pioneer protection board protection circuit protection ic
    • Replies: 1
    • Forum: Solid State
  7. alexhastings

    PA3004 chip PCB substitute

    After discovering a failed PA3004 chip on my SA-7700 rebuild, and paying $35 for a single replacement, I asked @merlynski to help me design a PCB substitute, so we can all keep rehabbing these old units without paying exorbitant prices for new "old stock" chips. Our design goal was to replicate...
    • alexhastings
    • Thread
    • pa3004 pioneer protection protection board protection circuit protection ic protection mode protection problem protection relay relay click
    • Replies: 66
    • Forum: Pioneer Audio
  8. Brett Becker

    Pioneer SX-1080 - No Delay Before Speaker Relay Engages

    First post ever on AudioKarma so be easy on me. :) There is one issue I can't figure out on a beautiful SX-1080 I'm working on. There is no speaker muting delay when you first turn on the unit leading to a nice pop and some impressive speaker cone movement. You can hear the two relays...
  9. merlynski

    PA3004 Pin 4 question

    The Pioneer SIP PA3004 protection IC is used in many of their products across all levels of build. My question is what voltage (or current) is needed on pin 4 to trigger the relay output pin 3 to go low and turn off the relay transistor. This questions assumes that all the other inputs are at...
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