[sdiy] yamaha spx-90 blown p/s caps

[Nate Reeves]

got it working, it was the caps!

i replaces the electro caps near the front of the board, and it booted  
right up with everything working (pot is a tad scratchy)

everyone says this unit is noisy but it seems fair to me, its  
unbalanced after all!

now if i could only make kevin shield music with it......

is there a mod for that? 8^p

cheers

nate

On Oct 8, 2008, at 2:32 PM, Kevin wrote:

> Also be sure to look at the bottom of the pcb around the darkened  
> area of the board (bottom/right in the first picture).  It's  
> possible that some of the traces were blown off.
>
> On Oct 8, 2008, at 11:30 AM, Kevin wrote:
>
>> How about the big black capacitor in the center with the silver  
>> marking on the top?  It looks like it is bulging.
>>
>> Have you looked at the bottom of the board to see if anything is  
>> leaking?
>>
>> You might also want to pull out the battery, as it is likely to be  
>> dead/damaged.
>>
>> I had a yamaha tx81z with a humming power supply (which looks  
>> somewhat like the one in your picture).  The humming stopped when I  
>> removed the old corroded battery.
>>
>> On Oct 8, 2008, at 9:43 AM, Nate Reeves wrote:
>>
>>> i think it is a linear supply but here is a pic
>>>
>>> http://picasaweb.google.com/natere2ster/YamahaSpx90Spx90II#
>>>
>>> i did notice that the heat sinked voltage regulator (?) was VERY  
>>> hot to the touch, with the unit being one for only 10 minutes
>>>
>>> my hope is that between the 2 boards i can make one fully  
>>> functional!  lol
>>>
>>> cheers,
>>>
>>> nate
>>>
>>>
>>>
>>> On Oct 8, 2008, at 12:12 PM, Peter Blackett wrote:
>>>
>>>> Dear Nate,
>>>> from what I can an remember I think the smoothing caps on the  
>>>> power supply are a weak point in the spx90.
>>>> is the power supply a switch mode unit ? it has been a while  
>>>> since I looked at one so I can't remember.
>>>> switch mode supplies are sometimes more critical of failing caps  
>>>> than the linear supplies.
>>>> regards Peter
>>>>
>>>> Nate Reeves wrote:
>>>>> hey all, does anyone have the schematics for the above unit?
>>>>> i am sure i can call yamaha and buy it but i rather save $$$ if  
>>>>> possible...
>>>>> i plugged this thing in and it took about 5 secs for a  
>>>>> electrolytic cap to smoke on the p/s board....
>>>>> should i replace all caps on the p/s board or just the smoking  
>>>>> gun? B^p
>>>>> cheers,
>>>>> nate
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