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sx-650 relay not clicking

markthefixer said:
no, it's an itty bitty surface mount component.

505-MKS2.22/63/10
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Have the whole day off today. I have some spare caps that fit these specs on hand. Going to order these replacements you’ve link and in in the meantime, throw in these spare electrolytic caps I have (they’re not from a reputable brand so wouldn’t want to leave them in long term). Interested to inspect the Sanyos and see if that is the etiology of the hiss and all of my problems!
 
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markthefixer said:
rcs16's word is as valid as mine, replace those Sanyo caps.
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Ok so Sanyo caps are replaced and hiss is still present just as before. When d7 is back in place I’m still getting the protection cycling. What’s the next step?

In addition to your troubleshooting help, one thing I might try on the side is to rig some kind of plastic tubing so I can put one end to my ear and the other area around each respective cap to try to isolate which cap the hissing is coming from. I’m almost certain it is from one of the caps on the vertical board (same board as the Sanyo caps) but cannot be for sure at this point.

As always appreciate your help and patience!
 
pretty jammed up, next 2 weeks or so....

sure, make stethoscope to localize hissing.

other advice as i can, everyone else is invited to jump on in.....
 
markthefixer said:
pretty jammed up, next 2 weeks or so....

sure, make stethoscope to localize hissing.

other advice as i can, everyone else is invited to jump on in.....
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Understandable. You’ve been wonderfully helpful to this point. I’ll work on my stethoscope and give you a bump in a couple weeks if no one else is able to help in the interim. Take care!
 
Anonky said:
Understandable. You’ve been wonderfully helpful to this point. I’ll work on my stethoscope and give you a bump in a couple weeks if no one else is able to help in the interim. Take care!
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Take each over-current detector (one per channel) assembly apart and test that the resistor values are in specification, new D4, D5, D6, D7 512-1n4148 diodes, new Q5, Q6 512-KSC1845FTA and the protect triggering problem will evaporate. so much fooling around for under 2 bucks worth of components

remember I posted this, it is an electronic map of those parts, and a physical map of where they are located:

upload_2022-6-7_20-11-15.png
 
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markthefixer said:
Take each over-current detector (one per channel) assembly apart and test that the resistor values are in specification, new D4, D5, D6, D7 512-1n4148 diodes, new Q5, Q6 512-KSC1845FTA and the protect triggering problem will evaporate. so much fooling around for under 2 bucks worth of components

remember I posted this, it is an electronic map of those parts, and a physical map of where they are located:

View attachment 2587266
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I’M BACK! And with progress?? Removed both Q5 and Q6 from the circuit and getting 0.7v drops across the correct pin outs so the transistors don’t appear to be the problem. Tested all resistors and diodes circled and they all tested exactly to spec. The capacitors were the Sanyo that have already been replaced. What is next?

I have ksc1845 on hand so I will empirically replace Q5 and Q6 in the morning. I don’t intend to replace those diodes and resistors unless you think there is a chance they still could be responsible for my issues even considering the on spec measurements.

I also have put together a dim bulb tester if that will be of any utility to us on this unit.

Edit: to be clear if you suggest replacing all these components I will do so! Sounds like we have the problem isolated to this area so I suppose replacing everything makes sense
 
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I went ahead and replaced Q5 and Q6 with ksc1845 and soldered D7 back into place. Don’t want to speak too soon but going on about two hours of listening now without issue. Even turned the volume up past twelve o clock and got no protection cycling. Hopefully this means it was one of those transistors causing the cycling? Oddly enough past twelve o clock I’m still getting the hissing. Keep in mind I’m having to do this with speakers disengaged so I can hear it. Not sure if it matters load vs no load (and if turning the volume up without a speaker load is physically stressing the amp?) but I will update in a few days if the protection cycling is fixed for good!
 
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addressing the hissing:

since it is volume dependent, use the balance control when it is hissing to quiet first one channel then the other, see (hear) if it goes away on one channel.
 
markthefixer said:
addressing the hissing:

since it is volume dependent, use the balance control when it is hissing to quiet first one channel then the other, see (hear) if it goes away on one channel.
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Still playing like a dream so I’m feeling confident we fixed it! Balance knob doesn’t make a difference. And I just had a realization. You know how you can hear the music from the needle on a turntable if you get up close? Basically the unamplified signal? That is exactly what this sounds like. Not just random hissing, rather extremely low volume kind of higher pitch (sounds like hissing) unamplified music that you can start to hear after 12oclock on the volume knob. I also caught it at the end of a track and the hissing cut to silence before the DJ queued the next track. ????? Is this normal?
 
Whatever the reason for that “issue” this receiver is otherwise working perfectly now. @markthefixer thanks for your patience and instruction. This has been a very educational experience. Really enjoyed this!
 
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