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protection board

  1. mgrisoli

    Pioneer QX-9900 Protection board

    So, this is the third QX-9900 I'm working on. I'm still to see a protection board as called out in the SM: None of the units I worked on have this board. This time I took the proper time to reverse engineer and document the board that is actually in the receiver: And now I am sharing with...
    • mgrisoli
    • Thread
    • pioneer protection board protection circuit qx-9900
    • Replies: 0
    • Forum: Pioneer Audio
  2. C

    Pioneer SX-780 Voltage Regulator Trouble

    Hey all, I have an SX-780 that refuses to come out of protect. PA3001 isn't getting the 13.5 volts it needs to come out of protect, but there are more issues. Q25 - 2SD712 7.6v on emitter 7.2v on base 8v on collector Q13 - 2SD325R 25v on emitter 28v on base 25v on emitter C316 has the...
    • CaseyWKC
    • Thread
    • 2sd712 pioneer protection protection board regulators sx 780 voltage
    • Replies: 62
    • Forum: Pioneer Audio
  3. R

    Sansui AU-999 Protection board F-1334 resistor smoking

    Hello i just get Sansui AU-999, and as usual i use DBT 60w, and first check dc offset and bias. But when i turn it on, the bulb bright just 1-2 seconds, then it off, then i smell burnt plastic. Then i turn off, its late night. So next day i turn it on again i see smoke, but im not sure from...
  4. P

    SX-727 Protection Relay AWM-027 with strange issue

    3 years ago, I did a major rebuild with Merlynskis help (RIP), but now the Relay on the AWM-027 protection unit has a lot of work with the protection job. After power is on, the dial light go on, signal and tuning needle move, but the protection relay won’t pull in. After some time and several...
  5. hitjazz

    Sabotage of KA-7100?

    With the help of a friend, I am beginning a project to revive my KA-7100 diagnosed with a protection circuit issue. As we move forward, I may look to this forum for advice. However, for now, we are stymied at the outset by what appears to be a short. Background: I checked all 4 fuses before...
  6. Ray122

    Testing Protection Mode

    So this might be a bit of an odd question seeing as there doesn't seem to be too many posts about it. Naturally lot of post have been about getting amplifiers out of protection mode, but what if I wanted to get my amplifier in to protection mode. Crazy right? This question primarily centers...
    • Ray122
    • Thread
    • amplifers diy pioneer pioneer spec 4 protection protection board protection circuit protection circuit issues spec 4
    • Replies: 5
    • Forum: DIY
  7. T

    SX-1080 Protection Board Lessons Learned

    Well I am done with the protection board. There are a few things it didn't fix and a few lessons I've learned. The replacement of the protection relay was not necessary as recommended. After I replaced it, I opened the old one. Not one sign of corrosion, pitting, burning, etc. It was...
  8. 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
  9. 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
  10. toymanmsp

    Pioneer SX-727 - Relay Issues

    Greetings everyone, I've run into an issue where the relay is not coming out of protection mode. Resources used for servicing 727 Have and use DBT Lot's of photo's DVM Transistor Tester Electronic Solder and Desolder Stations Original Service Manual Willingness to learn, I'm rather new at...
    • toymanmsp
    • Thread
    • head amp power supply board protection board protection relay sx-727
    • Replies: 76
    • Forum: Pioneer Audio
  11. NickG69

    Pioneer sx1010 bad protection board voltages

    Hi all, I have a Pioneer sx 1010 that went intermittently in and out protection; the unit is in a good shape and Just the big filter caps have been substituted some years ago; now the relay is stuck in protection so I opened the unit and made some measurement; the PS seems ok, the values are in...
  12. bzenic

    Bad relay, protection board or something else?

    Thank you for your fast response, starting a new thread as advised. My issue with SX-737 is that the with relay is switching randomly cutting the sound on and off . According to some advices found here I measured the voltages on the protection board WM 025: Pin 1: 6 mV Pin 2: -13.3 V Pin 3: 13...
  13. P

    SX-727, flyback diode on protection board AWM-027

    Hello at all, I get the SX-727 from my daughter in the next weeks for a little renewal and plan to improve the protection board with a flyback diode. So far I didn’t find an answer for this board, but rechecked the known position on the AWM-025 schematik and compared it with the AWM-027. My...
    • pa_200
    • Thread
    • awm-027 flyback diode protection board sx-727
    • Replies: 5
    • Forum: Pioneer Audio
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