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protection

  1. plresults

    Yamaha M50 Smoke - Help...

    Visited lady in her garage with equipment for sale. She plugged in M50 amp via extension cord. Protection light came on & went off. We started chatting about other stuff & maybe ten minutes passed - smoke out of amp. I know better and should have gone right into wall with cord. What I am I up...
    • plresults
    • Thread
    • dead transformer fuse portection circuit protection smoke
    • Replies: 31
    • Forum: Yamaha
  2. S

    NAD 2600 In Protection and General Troubleshooting Advice

    I recently purchased a NAD 2600 that appeared to be in beautiful condition - it was never worked on and cosmetically looked 10/10. It was clear the amp was rarely used and babied. However, once I plugged it in and powered it on, the protection light came on immediately and stayed on. This...
  3. QSilver

    SA-710 - total rebuild, blowing protection transistors

    Picked up an SA-710 which powered up okay but on testing, I found all outputs and driver transistors blown open and the transistors to detect over-current, DC and engaging the relay to be blown open too. The over-current ones were literally cracked in half! I've rebuilt it using new output...
  4. T

    Before I Rebuild 1080 Protection Board

    Okay, I have two issues and I need some input before I just jump in and replace parts.... The first issue I have is when shutting down the 1080. Upon flipping the switch, the lights go out, then the FM indicator light lights up and goes out along with the click of the relay. The unit powers...
  5. daveyh

    Sansui 990 clicks of relay in phono mode

    OK. Here's one for you. I have a Sansui 990 that clicks off the relay on the left channel when the volume is turned up. No sound except very low volume. The right channel is nice and clear. When I unplug the right channel RCA connector and and leave the left plugged in and turn up the volume it...
  6. ekimezeerf

    Kenwood KR-8340 Protection No Click

    Hello everyone! I looking for some help with a Kenwood KR-8340 Two Four Receiver. I've read through every post I could find about this family of receivers (KR-7340, 8340 & 9340) but haven't been able to narrow down my problem. When I power up the unit with a current limited variac, I get no...
  7. Sergimm

    NAD C352 entering protection mode on volume increase

    I have a new to me NAD C352 in quite a pristine state, sounds great and all functions seem to work correctly. That is, until I increase the volume at around a quarter of the volume knob, not loud by any means, at which point it enters protection mode. I am looking for some advice on what to look...
  8. The_I.M.P.P

    Pioneer vsx-d307 no sound and protection issues, any help?

    Good day guys i have a pioneer vsx-d307 receiver that comes on but doesn't play any sound, i do see a few obvious signs of problems like the power mosfet has scorching around them and theres a resistor (R459)that burnt completely off the board so i dnt know the value of it, i have downloaded the...
    • The_I.M.P.P
    • Thread
    • no sound pioneer vsx d307 pioneer vsx-d307 protection protection mode vsx d307 vsx-d307
    • Replies: 9
    • Forum: Pioneer Audio
  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. PE9ZZ

    Denon PMA-700V Output Protection?

    This is a modded Denon PMA-700V with a digital input. I had loaned it to my neighbor but to my chagrin it came back with blown output transistors (2SA1962/C5242). This was probably caused by a dry joint at the collector of TR505 but I am not sure. To prevent this from happening again I wanted to...
    • PE9ZZ
    • Thread
    • current limiter denon pma-700 protection
    • Replies: 7
    • Forum: Solid State
  11. Johnny_Law

    MC7300 One Channel On Fritz

    Aw, nuts. My left channel has developed interesting symptoms: -Higher output than right channel -Higher meter than right channel -Sound is choppy / distorted when right channel remains clean -Goes into protection at moderate volumes, unlike right channel -Higher output no matter what output...
  12. U

    Pioneer m90 Protection/power indicator

    Hey im new here first time. Living in the netherlands First of all very happy with my pioneer m90 with sonus faber consertos but to my issue here first of all i when i notice the protection/power protection power indicator wont lid this is my method of connection connected to Line direct ->...
    • Unseenlegend
    • Thread
    • issue pioneer pioneer m-90 power amp power indicator protection protection/power indicator
    • Replies: 5
    • Forum: Solid State
  13. Racingh11

    Soundcraftsmen reset delay

    Trying something new to create some fun around here(maybe). I am giving away a FREE Soundcraftsmen tee-shirt to the first person that can tell me what two components determine the A5002 amp's 3 second(approx) turn-on delay and protection reset. And give a description of how it works. This is one...
    • Racingh11
    • Thread
    • a5002 class h crowbar power supply protection soundcraftsmen
    • Replies: 27
    • Forum: Solid State
  14. Corktowner

    JVC A-X9 Relay Opens after 45 minutes

    Hey Team JVC, The A-X9 I am working on has a problem - after 45 minutes or so of playing the speaker relay trips and the music stops. The relay stays open for about 10 seconds, then it closes again the the music will play for about 10 seconds. The DC Offset and Bias are both adjusted...
    • Corktowner
    • Thread
    • a-x9 jvc overheat protection speaker relay
    • Replies: 12
    • Forum: Solid State
  15. duncan

    Denon POA 2200 repair/recap - some notes

    Nothing earth-shaking here but thought I'd post some pictures and notes for anyone who runs into a similar situation. I acquired a POA2200 power amp last year. The previous owner gave full disclosure that it seemed to have intermittent problems, but I couldn't make it misbehave. Actually the...
    • duncan
    • Thread
    • bias denon protection recap relay servo zener diode
    • Replies: 19
    • Forum: DIY
  16. Jeff Howard

    Protection mode.... sansui au-717

    Spent several months recapping my late grandfather's sansui au-717 and after turning it on it is staying in the blinking light mode or protection mode. Getting 0 volts in both speaker terminals for dc offset. Getting almost 0v on f-2721 for bias current voltage. But for f-2722 I am getting...
  17. joshvito

    Troubleshooting help needed.

    I built a single ended tube preamp (the circuit is here https://wtfamps.com/sofrito-preamplifier/). The preamp seems to be working great, however, my amplifier kicked into protection mode this evening. So, I decided to check to see if there was DC on the outputs of the preamp. I hooked up my...
    • joshvito
    • Thread
    • marantz preamp protection
    • Replies: 16
    • Forum: DIY
  18. P

    SX-737 power amp AWH-033 issue, blown transistors

    I need some help on the power amp on my SX-737 after an unsuccessful renewal attempt. What was done before! I changed caps and transistors on the power supply, protection circuit, equalizer assembly and as last one the power amp. All DC voltages have been good at the power supply and were even...
    • pa_200
    • Thread
    • 2sb530 2sd370 awm-025 protection sx-737 • awh-033
    • Replies: 148
    • Forum: Pioneer Audio
  19. Johnny_Law

    NAD 216: In Protection w/ Power Supply Issues

    Edit 1/4/20: Power Supply solved. Right amp issues now. Jump to https://audiokarma.org/forums/index.php?threads/nad-216-in-protection-w-power-supply-issues.871337/page-6#post-13374657. Research done thus far: https://www.diyaudio.com/forums/solid-state/330113-nad-216-help.html...
  20. nickhead

    SX-838 won't come out of protect

    I'm "new" to the forums, although I've been a lurker for about a decade. I've absorbed a great deal of information from the threads here. I now have a problem I can't figure out. SX-838, relay not engaging. I'm not an electronics expert, but I have more than a basic understanding. I was...
  21. WillRobinson

    Onkyo M504 Protection Mode Problem

    Hello all! I recently picked up an Onkyo M504 and P304 pair from a local estate. Both were in very nice shape, they were stored in a closed cabinet where they collected very little dust. I opened them up, blew out what little dust there was, did a quick visual inspection and saw nothing out of...
  22. D

    Sansui 9090 Red Protection Light

    Hello All, First time poster on AK (longtime lurker!). I just got a 9090 (not a 9090db) from a thrift shop, so not sure about its history. Was definitely in a smoker's house due to tar all over it. VERY dusty/dirty inside so I vacuumed it out and did basic clean up. Got the dial lights working...
  23. Johnny_Law

    9090 Static / Current at Idle into Protection SOLVED

    EDIT: Solution was to replace TR01-TR04 (2SC1708) on driver board with KSC1845. Each measured OK using multimeter but would heat up during operation and introduce much noise into the signal path. After extensive searching and not finding this exact issue ... here goes. I have a 9090 that goes...
  24. H

    SANSUI G-9000 PROTECTION ISSUES AFTER SCREW UP

    no one is perfect, least of all me! I am rebuilding a G-9000. In the last 6 months I have rebuilt 2 9090db's, a G-9700, a g-7700, a Pioneer SX-1250, and a Marantz 2270. Plus several others. Well I managed to make a huge error on the G-9000 on the bench now. I am doing a complete recap, and I...
  25. 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
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