• The move to the new server is done. There are some software and database maintenance updates in process. This has us passing the hat around to help out. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html

protection circuit

  1. Spotopolis

    Denon AVR x2100w Protection Circuit/Mode

    My 2100 was working flawlessly until my 9-year-old was showing off and cranked up the volume super fast up to max volume. It was there for about 5 seconds before it got turned back down. Ever since the protection light will come on when you power on the receiver, but only sometimes. Sometimes it...
    • Spotopolis
    • Thread
    • 2100 2100w avr avr-x2100w avrx denon protect mode protection circuit recieiver stereo
    • Replies: 3
    • Forum: Home Theater & Video
  2. prose116

    G-5700 staying in Protection

    Hi All, Picked up a G-5700 recently. Left channel was cooked, replaced all caps on 2980 board and cleaned off the old glue tested and replaced defective resistors and transistors on left side. right side resistors and transistors seem to test ok. Plugged into DBT and powered up, Safety light...
  3. ViperZ

    Help me troubleshoot Rotel RA-713 integrated amp

    Hi all, I have this integrated amp. The amplifier circuitry is fully working - I can trace sound all the way to the relay contacts, DC offset is a couple of mV on each channel. The relay works too - I can trigger it externally. The whole protection circuit is turned off - D903 is not biasing...
    • ViperZ
    • Thread
    • protection circuit ra-713 rotel troubleshooting
    • Replies: 19
    • Forum: Solid State
  4. D

    Sansui AU-717 Restoration/Reparation Advice

    Hi All!, I'm starting the planing the restoration of a just bought AU-717, I could read the very useful information around this forum regarding this amazing amplifier, as this will be my 3rd amp restoration (after a successful AU-217 and AU-317 ones), I feel enthusiastic enough to go forward...
  5. jdelange

    Sony STR-6800 SD - diagnosis needed

    Hi, I am trying to get a Sony STR-6800 SD receiver to work. Symptoms are: Sometimes switching to FM engagages the protection relay (sound is interrupted), switching to another source resets the relay Sometimes invoking the muting button on the tuner part (i.e. muting on) engages the protection...
    • jdelange
    • Thread
    • protection circuit receiver sony sony str 6800
    • Replies: 1
    • Forum: Solid State
  6. D

    CR-620 Stuck in Protection Mode

    Gang, I'm the original owner of a CR-620. Never over-worked, and always treated well. The only maintenance performed on it during its life was to clean the pots with Deoxit in attempt to fix "scratchiness", which worked perfectly. Turned it on in August 2018 and, low and behold, the output...
    • Demiglaz
    • Thread
    • cr-620 protection circuit relay stuck in protection mode
    • Replies: 38
    • Forum: Yamaha
  7. O au-d11mK2

    AU-alpha607DR and protection ... :-(

    So i bought an amp I had been searching for ... And when listening to it at the previous owner it had some cracking noise on on channel, we turned it of and switched the loudspeakers. And when we turned it on again It never went out of protection ... I still wanted it, but when i inspect it now...
  8. 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...
  9. tabpat

    HELP! Diode identification

    I've been working on this Project One Mark IIIB for weeks now (on and off). Long story short, the protection relay activates on the right channel - mid volume - with or without a load. I have isolated the preamp/amp, swapped amp boards and outputs (left to right), replaced all transistors, all...
    • tabpat
    • Thread
    • diode identification project one protection circuit
    • Replies: 18
    • Forum: Solid State
  10. C

    SX-780 Protection Relay Chatters on Startup

    Hello, I have a Pioneer SX-780 that I bought new in 1980 and worked well through the late 90's when it was relegated to a closet. I have since dug it out and I am using it in my office where it works beautifully except for one issue that is more bothersome than anything. On startup the...
    • cgtuttle
    • Thread
    • delay protection circuit protection relay sx-780
    • Replies: 7
    • Forum: Pioneer Audio
  11. tabpat

    Project One Mark III protection mode

    I took on a project (pardon the pun) for a friend of mine who is trying to get his brother's old Project One Mark III stereo working again and surprise him with it. He initially told me it was "blown." Honestly, I couldn't find any issues other than really grubby switches and frozen meters...
    • tabpat
    • Thread
    • mark iii project one protection circuit
    • Replies: 0
    • Forum: Solid State
  12. tabpat

    Project One Mark III protection mode

    I took on a project (pardon the pun) for a friend of mine who is trying to get his brother's old Project One Mark III stereo working again and surprise him with it. He initially told me it was "blown." Honestly, I couldn't find any issues other than really grubby switches and frozen meters...
  13. Juanbanzai

    Marantz 2245 P800 (Protection Circuit) Board Issue

    Good morning. I'm in the process of recapping my 2245 - taking one board at a time - and I've run across an issue I want to ask the experts about. This unit was in really sad shape when I got it, but it WAS working. The power switch needed to be replaced before any additional rebuilding could...
  14. T

    SA-9100 Protection light on and off

    I have a SA-9100 that recently goes into protection after about 5 minutes. The light will turn on for about 2 seconds, I'll hear the relay, light turns off for about half a second, and then turns back on again. What's more weird is that I'll turn it off for a couple minutes and when I turn it...
  15. mattstech

    Sony GX59ES... Keeps going into protect?

    Got this one for free, from neighbors cleaning out the basement. It was apparently part of a "stereo system" but... this is all that's left! Wasn't powered on for almost 15 years according to them From the early 90s, 80wpc I believe. Thick metal face, metal knobs. Part of Sony's ES line, which...
    • mattstech
    • Thread
    • helpmefix protection protection circuit reciever sony
    • Replies: 12
    • Forum: Solid State
  16. tabpat

    Pioneer SX-2500 and that protection circuit

    Hello all, I have a Pioneer SX-2500 that is giving me (us - if you include a local tech) fits. It plays well up until 1/4 volume, then goes into protection mode. It takes a few seconds and comes back. Now...if I pan only to the right channel, it will rattle the windows in my house. Powerful...
    • tabpat
    • Thread
    • pionner protection circuit sx-2500
    • Replies: 4
    • Forum: Pioneer Audio
Back
Top Bottom