[sdiy] Prophet 5: +5v drops to +4v

[Gil W.]

Solved,

There seem to be a bad contact between the wires
connecting the PS to the 5.6v input on the main board.

Once I fixed that, the +5.47v is back.

I could play the Prophet for a few hours now with no
issues...

Thanks !










--- "Gil W." <gil_we at yahoo.com> wrote:

> Hi all !
> 
> Really need your help on this, thanks in advance...
> 
> After building a powersupply to my Prophet 5 rev.
> 3.2,
> and having it working just fine two days ago,
> getting
> correct voltages, I decided to try to connect CPU
> fans
> to the power supply so I can cool the heatsink down.
> 
> I used two 5v CPU fans and connected them in
> parallel
> with the 5.6v powersupply rail.
> 
> >From that very point, and also after I took the
> fans
> out of the circuit, I'm no longer getting 5v in the
> main board, but rather than that - I get about
> 4.10v-4.00v !! When checking the voltage across the
> 5.6v power supply rail, it first shown about 5.30v
> and
> then dropped to 5.00v and even below that...
> 
> Will anybody help me with where to look at ??
> 
> Is it likely that I damaged an IC on the main board
> ?
> or did I damage anything on the power supply itself
> ?
> 
> One note:
> 
> When I disconnect the 1N4002 diode which goes across
> the +5.6v input and the +5v main board rail, the
> powersupply shows correct 5.6v ...
> 
> Really need your help on that one... Thanks !!!
> 
> 
>      
>
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