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protection circuit issues

  1. B

    Pyle PT-610 Protection Circuit

    I have a Pyle PT-610 and the protection circuitry light is illuminated. This indicates an overload in the amplifier. Cycling power and removing all outputs did not correct the issue. Checked 3A 250V fuse and issue was not resolved I have not checked the power caps as of yet, but before...
    • brewaudio
    • Thread
    • protection circuit issues pyle pt610 schematics needed
    • Replies: 0
    • Forum: Solid State
  2. audio_exp

    Sansui G-8000 tripping protection too soon?

    I have a G-8000 that’s working fine except protect issue. It was recently re-capped and sounds fine but when you turn up the volume it trips the protection. Bias (16mV DC) & Offset (0mV DC) are perfect. I just have a small pair of 8 ohm KEF C20’s connected. Not sure where to go from here but I...
  3. J57LITTLE

    Yamaha CR-640 Repair

    Greetings, I am new to the forum, but with help I've already received from AK I was able to return a Yamaha CR-640 to life. There's still some work to do, but I got it up and running...for a while. When I inherited this unit, I could not power it on. My 300W bulb tester lit up like a roman...
    • J57LITTLE
    • Thread
    • protection circuit issues yamaha cr-640
    • Replies: 25
    • Forum: Yamaha
  4. Mike1767

    Cr-2020 Troubleshooting

    I have recently brought home a 2020 from my parent's basement that I am hoping to bring back to life. Growing up, it was my Dad's pride and joy, but it has now been sitting unused for too long. I am half decent with a soldering iron and multimeter and can read a circuit diagram, but I can't...
    • Mike1767
    • Thread
    • cr-2020 protection circuit issues relay solved troubleshooting yamaha
    • Replies: 18
    • Forum: Yamaha
  5. GrisPato

    Sansui AU-X701, relais not closing

    I took on an attempt to repair this amplifier for a fellow Sansui enthusiast living near by. He bought the amplifier two years ago, restored. Has been working fine up to some time ago when it would start with intermittent faults, no sound output. Owner managed to get sound by working the speaker...
  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. dustmaker

    SX-880 with protection issues

    Ι’m repairing a SX-880 going into protection. I’ve already replaced the two caps and transistors in the protection circuit that often go bad. That fixed the initial problem and the unit now works but only when volume is below 1/4. Unit works with both 8ohm and 4ohm speakers until it trips...
  8. M

    SX-750 loses sound

    Hi, folks! Before I plunk down repair money, hoped the experts would have some input on this. I've had an SX-750 that seemed to work pretty well, and sounded great. (Second owner after my mom.) But now the sound will spontaneously cut out. Typically it goes out for a few seconds, then I hear the...
    • Misha S
    • Thread
    • protection circuit issues sound cuts out sx750
    • Replies: 12
    • Forum: Pioneer Audio
  9. S

    Help! 9090 protection issues - flashing red

    Hi Sansui lovers. Please could someone help with my 9090? Iam in the UK where techs are hard to come by! I have a beautiful 9090 that won't come out of protection even with the driver board removed. I've replaced c01, c02, c03, tr02, tr01 and the relay so far. The relay does latch at first but...
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