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

[Nate Reeves]

oops, looks like the connector CN4 is correct, pins 2 & 3 are DG as  
well, so i guess it makes sense to have pins 1,2,3 be DG and pins  
4,5,6 be +5V ( or in my case 4.33V)

what are the tolerances for digital logic?  5.00V-4.33V = 0.67V

should i adjust VR1 to a closer value (if possible)?

it seems when i unplug the other connector on the power board, CN3,  
the input level bar meter lights up and everything else cuts off!

i suspect CN3 is giving all digital stuff a ok but something is screwy  
with the other power outputs

i will check all caps......
cheers
nate









On Oct 8, 2008, at 1:06 PM, Roy J. Tellason wrote:

> On Wednesday 08 October 2008 12:52, you wrote:
>> hey roy!
>>
>> how much for both the spx-90 and 90 II service manuals, shipping
>> included?
>
> I'd have to pull 'em,  and see how much they amounted to.  Typically  
> these are
> going for $15-20 each.  If that sounds expensive the basis for  
> comparison I'm
> using is that there's only one other site that I've seen that offers  
> these,
> you download them and print them yourself,  and theirs are all  
> either $20 or
> $35.  And I don't see that approach as being too practical with  
> Yamaha's
> tending to favor big poster-sized schematics for a lot of their stuff.
>
> What I've got is what's listed on that page,  and that file  
> continues to
> shrink as folks buy stuff.  I got one other response to that post  
> and that's
> three manuals of different brands.  And when they're gone,  they're  
> gone.
>
>> i live in cartersville ga 30121
>
> I usually like to keep postage as a separate issue,  depends on how  
> fast you
> want it.  I'll pull 'em when I go over there today,  and see what  
> they weigh
> and such,  and then hit the PO's web site and be able to give you some
> options to look at.
>
>> sorry i missed your link the first time LOL
>
> :-)
>
>> i only paid $1o for these units
>
> Wow.  No wonder there's no money in fixing stuff these days...
>
>> so i would like to keep the cost as low as possible, i dont know  
>> what yamaha
>> charges (probably a lot)
>
> I have no idea myself,  but I think it's typically more than I'm  
> asking.  :-)
>
>> i ordered a schematic service manual from them for a dx-21 years
>> ago......my first synth!
>
> I have that schematic too,  if anybody needs one.
>
> -- 
> Member of the toughest, meanest, deadliest, most unrelenting -- and
> ablest -- form of life in this section of space,  a critter that can
> be killed but can't be tamed.  --Robert A. Heinlein, "The Puppet  
> Masters"
> -
> Information is more dangerous than cannon to a society ruled by  
> lies. --James
> M Dakin