Efbee
New Member
"Retired Tinkerer"
Last Activity: Yesterday, 04:23 AM
Joined: 05-17-2025
Location: Mossel Bay, Western Cape
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Thanks again. I will look for some SMD zero-ohm resistors of similar size, so that the wattage/point of failure stays similar to what it was before. With my strands now over the contact points, I am not at all sure what amps it will handle as either too much or too little might cause a problem. Which brings me to something I still want to do - I want to test the amps there when music volume is at its highest. -
Success!! Wow, was I glad when starting it with the 220VAC globe in place and it giving just that one blink. No explosions happened and the next moment the download bar started building in the display. So yes, thanks a lot CapLeaker, your suggestions worked, and I was able to run some music through the AUX with no interference. I must say, I did test most of any surrounding components, and I could not find a single anomaly.
I decided my next best step is trying to get it back to as close as I can to the original state, especially due to the system being able to protect itself during...Leave a comment:
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Hi, I tried my best to reflect the content of my previous post into a schematic of the immediate area of my issue. I made a few mistakes in my original explanation, but at least I think they are now more correct on the schematic. Capleaker, I think you are 100% correct in that those 2 components are there as fail items to prevent a catastrophic explosion of the tracks when a short happens alongside that 320vdc line - the slow burn fuse is just too slow to prevent that, although it did fail in any case. Apart from the fuse, one of the tracks on the negative line, inside the layers of the board...Leave a comment:
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Hi Capleaker, Thanks so much for replying. Unfortunately I do not have the schematic for the Sound Touch 30. I only have it for the Sound Dock 10 which is almost 100% the same PSU board except for this part that works totally different. In this case the positive and negative 320VDC lines run from the two triacs which are located over the 450v caps, then throughs these 2 components, then through a plug to the other board and there they each run through 510 Ohm resistors. The negative line then runs through a 22 Ohm resistor (R608 =3W), and then through a cap to ground as well as a 100k ohm resistor...Leave a comment:
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Hi Guys. I am also trying to fix a Bose Sound Touch 30 with the same issue of it not powering on. In my case the fuse is blown, and my theory of what could have happened, is that a spike in the AC from the input caused the positive and negative lines of the two very thin rectified lines of 320VDC coming from the 2 varistors located over the two 450V caps and going through the J402 plug out to the Altair05T IC on the other board to short - there is a black short mark just right next to the J402 plug where the two lines comes closest. In the process the two SMA components, one each in series of...Leave a comment:
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Being retired, I feel at your forum here as several people indicated that they are familiar with some the earliest personal computers. I also started off using a Commodore in the middle 80's and by 1989 became quite an expert in DOS and spreadsheets like Lotus and Supercalc. My greatest achievement those days were when I was, after much research being able to add a second floppy drive to my computer to not have to exchange the OS floppy with the application floppy every time I had to do something different.
Those days I was already fixing everyone's radios, tv's and VCR's and a keen...Leave a comment:
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