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protection relay

  1. R

    [HELP] Sansui AU-7500 dc offset sudden fluctuate

    Hello AKers, i just bought AU-7500 and not recap yet, because i want to hear how it is before recap. And after checking all transistor i think its still original. Some transistor is not like in schematic, but its looks old. While i test with speaker first day when i turn the power knob off, i...
  2. tutor_turtle

    2283B: Known trouble-some transistors?

    I have a Marantz customer I did a complete recap on his 2238B a few years back. The customer was very pleased with the results, Now a few years have past, he's getting drop-outs on one channel. I don't have it in the shop yet, I'm having him try out all the switches to eliminate dirty contacts...
  3. Magistra

    Relay only clicks in after 20/30 minutes, then everything works fine. Luxman A-007

    Hi guys, I got a Luxman A-007 (european 220V version) with a relay issue: when I first got this a few years ago it worked perfectly but over time it started randomly turning silent with a distinctive relay click, and then randomly on again after a few minutes, this went on until it just stopped...
    • Magistra
    • Thread
    • luxman protection problem protection relay relay relay issue
    • Replies: 21
    • Forum: Solid State
  4. S

    Pioneer SX-650 Protection Relay Issue

    Hello everyone, I hope you can help me. A few days ago my beloved SX-650 suddenly stopped working during a listening session. I turned it off and on again and noticed that the clicking noise from the protection relay was missing, so I went to this forum and looked for answers. I got my...
    • sx650pio
    • Thread
    • pioneer pioneer sx-650 protection relay sx650 troubleshooting
    • Replies: 7
    • Forum: Pioneer Audio
  5. JB8

    YAMAHA CR-620 Protection Relay Fun

    Yamaha Squad - Here's the story: CR-620 powers up with lights on, no sound, no relay click Replaced C816, no change Replaced TR809 with KSA1013, no change Replaced TR808 with KSC1845, now relay is clicking immediately (I'm used to waiting a couple seconds before these engage but this one now...
    • JB8
    • Thread
    • protection relay yamaha yamaha cr-620
    • Replies: 114
    • Forum: Yamaha
  6. R

    Pioneer SX-980, Circuit Protection Relay, Random Drop outs

    I'm hoping someone on here might be able to help. I have a Pioneer SX-980 receiver in pretty good shape. The receiver worked great until I discovered my speaker wires shorted together and it caused the Pioneer overload protection relay to kick in when turning on the receiver. I replaced the...
    • RobertSX980
    • Thread
    • clicking overload overload protection relay overload shutdown pioneer protection relay sansui sx-980 sx980
    • Replies: 13
    • Forum: Pioneer Audio
  7. Beavs

    JVC JA-S71 Protection / Power Supply Troubleshooting Help

    Need some help as the amp won't come out of protection mode and my troubleshooting knowledge has a long way to go. Got this amp knowing that the left channel was out. Turned out to be the same issue others have had with the wire connection to the volume pot (see post #5 here...
    • Beavs
    • Thread
    • jvc ja-s71 power supply protection relay
    • Replies: 6
    • Forum: Solid State
  8. T

    1080 protection relay and switch cleaning

    Okay, I'm about to rebuild the protection board in my 1080 and I've always wondered about the one relay with the tape around it. Since I'm about to replace it, I decided to pull the tape off and found what appears to be magnets on either side of the relay, but not sure. What are they? I'm...
  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. Farducci

    CA610 II Protection Relay Slooooooooow

    Hey All, Looking at a CA610 II Amp for a friend as they said it's taking longer and longer to "turn on" as they use it. I've looked into it a bit and have noticed the protection relay does take about 2-3 minutes to activate with the power on, then the amp operates normally. Once warm, if I...
    • Farducci
    • Thread
    • amp ca610 capacitor protection relay slow cold start yamaha
    • Replies: 12
    • Forum: Yamaha
  11. Stereoboy70

    SA7700 protection relay dropping out

    Hello again. I’m having trouble with this amp. When I’m running the volume about half way the ice cube relay will open up until you turn down the volume and then about 5 seconds later it closes again and I have sound. At low volume it’s fine and will play all day. The relay has been...
  12. S

    Optonica SA-5605

    Hey Everyone- First Time Post. Been Lurking. So, I got a HH Scott, LK-72 last year, recapped it, almost works good. Decided I would set it back, and go through it further later. Then, I was at an estate sale and picked up a dirty Marantz 2245. Cleaned it, recapped the power board, and it...
    • shawnmgray
    • Thread
    • no sound optonica protection circuit protection relay sa-5605
    • Replies: 3
    • Forum: Solid State
  13. 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
  14. MAV

    Pioneer SX-939 protect relay shuts off with volume increase (pict)

    Hi all, I have a SX-939 that turns on plays normally until i turn the volume up and then protection relay clip. I have set Bias 25mV and check speaker output 0V. The output signals look good (1khz, 8ohm) in the oscilloscope but when the signal starts to approach about 18V (40W) the protection...
    • MAV
    • Thread
    • oscilloscope pioneer sx-939 protection relay
    • Replies: 23
    • Forum: Pioneer Audio
  15. kyledp

    Pioneer SX750 Protection Relay Keeps Popping

    Hi All, I'm new here. I've done lots of restores on smaller project (Guitar effect pedals, small stuff like that) and have decided to restore my 1977 Pioneer SX750. I used the de-ox-it on all the switches and knobs and it was sounding pretty good. But then, after a particularly loud listening...
    • kyledp
    • Thread
    • pioneer sx750 protection relay
    • Replies: 93
    • Forum: Solid State
  16. sanjib

    Speaker Protection Relay Replacement for Marantz 2265

    Hi Anyone got any sources for a new compatible replacement of protection relay for Marantz 2265? Thanks in advance!
    • sanjib
    • Thread
    • marantz 2265 protection relay
    • Replies: 5
    • Forum: Solid State
  17. Nashou66

    Pioneer QX-949A in protection, one channel high VR 3/4 voltage.

    Hi I have this nice shape QX-949A where it is in Protection. When I first got it to look over The relay would click after a long while and I was able to get a few DC measurements off the speaker Terminals but then its click out again going into protection. I have the Service manual and need...
  18. M

    PIONEER SA8800 protection relay problem

    Hi, I'm new in this forum, I have a pioneer sa8800 and sg9800; I buy this amp 2 week ago and it on first 2 week work well, last week I turn on the amplifier but no music are on the speakers. I see other thread on this forum where talking about protection relay problem and also in my amplifier...
  19. polypetalous

    Realistic STA-2000 Protection Relay Voltages... Anyone?

    I love my vintage Realistic setup.. but, boy does it like to keep my guessing. Realistic STA-2000 Been having intermittent Speaker Protection Relay issues... About once every couple of weeks, I will encounter an issue where the protection relay will engage/disengage say every 5-minutes or so...
  20. 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
  21. gregmcm

    SX-980 Protection Circuit Issue

    Have read a lot of threads and the protection relay kicking in seems to be a common and sometime mysterious problem on a number of Pioneer units. Wondering if anyone has had a similar experience to mine (see below) and if so were they able to identify the source of the issue. Here is my story...
    • gregmcm
    • Thread
    • pioneer sx-980 protection relay speaker protection
    • Replies: 4
    • Forum: Pioneer Audio
  22. 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...
  23. c.coyle

    Hot speaker relay

    I have a Nikko TRM-750 integrated amp. There is a 560/2W (R761) resistor right next to the speaker relay that gets too hot to touch, and the relay itself ends up very warm, but not hot, after 30 minutes. It looks like this resistor brute force drops the B+ down to 24V for the coil. It is only...
  24. crkeith65

    8080DB F2624 driver board frustration

    Let me set this post up right to begin with. I have owned this 8080DB since new. After letting it sit idle for many years because of driver board failure, I took it out to reclaim it's glory. The driver board was completely gone through along with re-capping the power supply board and 4 new...
  25. faber12

    Pioneer SA-7500 II protection relay replacement

    I am replacing the protection relay in my SA-7500 II. I referenced this thread to find the part number for the replacement relay: http://www.audiokarma.org/forums/index.php?threads/question-on-how-to-remove-the-cover-from-a-pioneer-protection-relay.647331/ Mouser part No. 653-MY4-02DC24 It...
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