Question about Yamaha YST-SW015 Subwoofer

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Not working i think is burnt how can i fix it or where i can find the STK 404-070 power amplifier

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Posted on Jul 10, 2014

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Power light is lit, but there is no sound coming from the speakers , it was working fine and just stopped working ?


Its an PA amplifier and i think this is build with an integrated powerpack IC output stage,
There are different TOA amps but if this model look first the fuses if that are (important)measured defect give a new fuse a try if it blows again there is something wrong in the cables or a speaker conection or filter , ut if the fuses are good there could be an single great brown or black colored IC with STK (....)A or B or something similar is to read on it on the great heatsink inside the amplifier that could be having 15 or more legs must be replaced , BUT also some capacitors thats belong to the output stage because every defect is having a cause.
It think this amplifier IC should similar be looking like this
26253047-nwnvuahhhrjrcsufn1cxvexd-4-0.jpg

Aug 05, 2016 | TOA Electronics - P-924MK2 - 240 Watt...

1 Answer

My Technics SUV 660 is making a crackling and popping sound regardless of where the volume is. It does reduce once the amp has been on for an hr or so. Also the speakers are not consistantly on. Any a


If the sound is on both channels then it's probably a device that is connected to both channels. I don't think it's the power supply. I rather suspect it's in the power amp section, since it's not affected by turning up the volume. If the amp uses one of those STK devices as a power amp, it could even be that.
Image of an STK power amp below:

d4f2684d-d4d8-4793-8260-29e0b2210ba8.jpg

Feb 17, 2014 | Audio Players & Recorders

1 Answer

STK 8170


Have had a good look on the net and no STK 8170! Except your post on Fixya!! Which is odd. So I'm thinking you might have read the number wrong.

Jun 29, 2012 | Audio Players & Recorders

1 Answer

My amp will not turn on i think its burnt how would i fix that


Using a multimeter, check the power going to the amplifier for around 12 volts, and check the remote wire for anywhere from 3 to 12 volts. If power is getting to the amplifier and the remote wire is signalling the amp to turn on, check the fuse/s on the amplifier. If the fuse is not blown, have the amplifier checked out by a stereo shop or send it to the manufacturer for warranty repairs.

Jan 17, 2011 | MTX Car Audio & Video

1 Answer

I need the value of resistor 45. It is discolored and looks like either red white red or orange white orange. I think the tolerence is silver but not sure. Thanks, ae4qp The unit comes on but has no...


150 ohm, 1/4W. But the problem is in STK 404-070 power amplifier. If you change only resistor, it will burn again. Try to replace power amplifier and then resistor.

Dec 28, 2010 | Yamaha YST-SW015 Subwoofer

1 Answer

I have a 50 inch theatre view tv I bought 7 years ago. The sound is going on it. It is very quient and muffles sounding. Can I fix this myself? Thanks for your help. Looking forward to your...


http://www.fixdevice.com/smanuals/file/31187.html
Above is your service manual, i believe your problem will most likely be the STK device Stereo audio output amplifier, developing a fault, either that or the power to the Amp is compromised, so as always start with the Power supply first and work out. Replacing the STK device is not too hard, you need a desoldering tool, and a good 40 watt soldering iron with a fine tip and some rosin cored solder.

Also have a look at this master google link, have a look regarding the stk replacement in particular.
http://www.google.co.nz/search?sourceid=chrome&ie=UTF-8&q=Toshiba+50H72+service+manual
BE CAREFUL

Nov 11, 2010 | Toshiba 50H72 50" Rear Projection...

1 Answer

My audiobahn amplifier isnt working, the status


it maybe fixable. the problem is that when you find what is burnt or messed up, you replace it. after that you need to find out why it burnt or messed up. i wouldnt recomend trying to fix it your self unless you wanna chance it. but if you take it to a technician that can fix it the will be able to tell you if it can be repaired. also check your power and ground wires. make sure youre getting 12 volts to the amp. check your subs and make sure they are good. a bad sub will put a amp into protect. good luck.

Dec 17, 2009 | AudioBahn A2300HCT Car Audio Amplifier

1 Answer

Protect comes up on my hx-c6


That is the common symptom of the defected STK-IC in power amp.section that busted already or just a loose connection.First try to resolder the pins of STK-IC and also all component parts joint in power amplifier section if its works! if not that is the time you replace it, so it works normal again.

Hope it may helps you...

Jun 12, 2009 | JVC HX-C6 Shelf System

1 Answer

Ground wire burnt plactic cover on amp where wire goes in


REPLACE THE WIRE MAKE SURE IT DOSE NOT RUB AGAIN REPLACE FUSE IF THAT DOSE NOT WORK SOME COMPONENTS MAY HAVE BURNT UP HAD TO SAY WITH OUT LOOKING AT IT TAKE THE COVER OFF SEE HOW BAD IT IS GOOD LUCK

Feb 16, 2009 | AudioBahn A2300HCT Car Audio Amplifier

3 Answers

Immeadiatiy shuts off


Always be the audio amplifiers IC's damaged.Good luck

Jun 04, 2008 | Yamaha HTR-5630 Receiver

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