Nice! I have repaired a few of these, and have found the linking ground pins 8&9 on the connector (not IC), sorts the stability and/or buzz issue when changing to the 404-140.
I had one from new. It just sounded ok because i never had one subwoofer before. Turns out it sucked big time. It distorted alot. Really bad construction. Bad bracing. The amp plate served as one box side and so it leaked pressure and ratled. Very low power. Any entry level polk audio, wharfdale, kef, etc was clearly a step up.
hola, creo que tengo el mismo problema. mi subwoofer es un sa-wmsp85 sony no emite sonido. pregunta, como se le llama esa pistola para quitar soldadura?
I find a lot of different ESR tables which don't usually agree with each other. Its only an issue for borderline ESR readings I guess but it bugs me that it is not black and white. Like ESR of more modern caps can be pretty low compared to some older caps but it does not mean the older ones are bad. Can you comment on that? I see your ESR meter has a table on the back. Is that what you go by?
Check the main fuse 1st. Check the output stage (STK) for a dead short between the B+ and speaker output, and the B- and speaker output. Also check B+ to B- for shorts. If none are found then check the standby power supply for issues.
I've got this active subwoofer the problem is when I switch on green light comes on you can hear first relay kick in the problem is second relay is not kicking in and there is no sound coming from subwoofer now I normally heard both relay but now I hear only one the first one what can be a problem?
Me too. I actually got it to make a noise the other day, but it mostly does what you describe. I was considering taking mine apart to look at the electronics. His earlier video was about the line in connector becoming lose.
Thanks very much Norcal, i always enjoy your videos, i need your input on a problem i have, i am living in the uk but i just purchased two rhythmik subwoofers from the usa problem i have is hum on both of them, do you know if there is anything i can do to fix this problem,thanks.
It is a (No Name) cheap Chinese Hakko knockoff. Model 862D+ Here is the conversion from Celsius to Fahrenheit conversion. czcams.com/video/j9aHFxjvUV0/video.html
That’s what you call a mains transformer. Cute cat.
Over here it's just a power transformer, everywhere else it's is indeed a mains transformer.
Kitty can now enjoy many more years of enjoyment, well, so can you.
Great video
Nice! I have repaired a few of these, and have found the linking ground pins 8&9 on the connector (not IC), sorts the stability and/or buzz issue when changing to the 404-140.
If I have any more issues I will try that. Been using it for about 2 weeks now with no hiccups.
0:10 "Holy dust batman!"
👍....Steve.
Well done.
While you have it apart, might as well change those large CAPs! ELNA, TOSS and replace with Nichicon!
Elna is known for audio grade capacitors.
I had one from new. It just sounded ok because i never had one subwoofer before. Turns out it sucked big time. It distorted alot. Really bad construction. Bad bracing. The amp plate served as one box side and so it leaked pressure and ratled. Very low power. Any entry level polk audio, wharfdale, kef, etc was clearly a step up.
Like always good video thank you..
It was making everything in this room rattle. I have a Sony 8 inch sub connected to my computer.
Mine just died after speaker cables touched the bac cover of my hi fi...what could be the problem
Hi sir my subwoofer has no sound at al what should i change got the same sub
Mine turns on the green light but no sound what wrong?
hola, creo que tengo el mismo problema. mi subwoofer es un sa-wmsp85 sony no emite sonido.
pregunta, como se le llama esa pistola para quitar soldadura?
It is a Hakko FR301 desoldering tool
I find a lot of different ESR tables which don't usually agree with each other. Its only an issue for borderline ESR readings I guess but it bugs me that it is not black and white. Like ESR of more modern caps can be pretty low compared to some older caps but it does not mean the older ones are bad. Can you comment on that? I see your ESR meter has a table on the back. Is that what you go by?
Hi am simon how can i contact you am having this subwoofer sony sa mv 500, with no sound comming out
I have the identical subwoofer and it stop working a few days ago. The power light isn't turning on. Any ideas on how I should test it?
Check the main fuse 1st. Check the output stage (STK) for a dead short between the B+ and speaker output, and the B- and speaker output. Also check B+ to B- for shorts. If none are found then check the standby power supply for issues.
I've got this active subwoofer the problem is when I switch on green light comes on you can hear first relay kick in the problem is second relay is not kicking in and there is no sound coming from subwoofer now I normally heard both relay but now I hear only one the first one what can be a problem?
Me too. I actually got it to make a noise the other day, but it mostly does what you describe. I was considering taking mine apart to look at the electronics. His earlier video was about the line in connector becoming lose.
I was wondering how I can send you the hot plate?
Email me Norcal715videos@gmail.com I have another part to this sub coming in a few days when I get finished editing it.
👋😎👍
Thanks very much Norcal, i always enjoy your videos, i need your input on a problem i have, i am living in the uk but i just purchased two rhythmik subwoofers from the usa problem i have is hum on both of them, do you know if there is anything i can do to fix this problem,thanks.
I am not familiar with that model. I would suspect failing capacitors somewhere.
@@norcal715 okay thanks, this subwoofer is coming out of Texas, just bought them some nonths ago.
Hi Steve, just wondering how you decided to add the capacitors to reduce the hum? What was the troubleshooting procedure that you did?
I intend on doing a part 2 soon. I will address that issue.
sir..1 question..if add 1 audio IC stk 404-140s ..i mean 2 pcs in 1 board..what will happen 😁
You mean instead of one STK you have two? and you parallell the pins of both ICs. Pin 1 to 1, 2 to 2, and so on?
@@norcal715 yes..i want to try like that to upgrade rms power can i do that,,I'm afraid if any other competent is damaged
Where to buy stk 404 140s
All over the place. eBay, Amazon, Ali Express. Good luck finding one that is not a knockoff. Check out my video on it.
Thanks for this vedio.
what is the brand of your soldering iron.
The colors indicate that it's a Hakko. Also *Video :)
It is a (No Name) cheap Chinese Hakko knockoff. Model 862D+ Here is the conversion from Celsius to Fahrenheit conversion. czcams.com/video/j9aHFxjvUV0/video.html
@@norcal715 I am talking about the desoldering pump that you have of which brand
1:30 what's the name of that lovely cute cat i love it
Her name is Mira. She was not expected to survive birth. Short for miracle
@@norcal715 she is so cute
Where you buy your STK amplifier?
I think this one came from Dalbani
Hello norcal, how can i order that stk from India🇮🇳
He doesn't sell parts. Order yourself from a supplier :)
@@zaprodk please can u suggest good online site for order in minimum quantity
I ordered it from Dalbani
Today's most of the STK amplifiers aren't original. Do you get a good reability after replacing the STK amplifiers?
@@Trucam2020 no Sir