Vintage Synth Repair

Thanks,

there's no short read between ground and -15 rail on the board, when
cap is removed. The PS supplies -15v when unconnected. The rating of
the tantalum is 25v and it is placed correctly.

One thing that I must note - when first connecting the PS, I used
smaller heatsinks than required for the regulator. Could the -15v
regulator go bad even though it still supplies -15v when the PS in not
connect to the board ?

--- In vintagesynthrepair@yahoogroups.com, scott frye
...> wrote:
>
> Tantalums are not at all forgiving in a reverse bias OR over-voltage
setting.
> Remove the cap and see if you actually have a short circuit first.
Then make sure the voltage ISNT more than the cap rating. Otherwise
it's POOF again.
>
> gil_we wrote: Hi all,
>
> I'm trying to solve a problem with a P5 I just got.
>
> It looks like the -15v rail on the main board is shorting.
> Each time I'll power it up, the 10uf tantalum capacitor which filters
> the -15v is getting fried and open (shorting) immediately.
>
> Any ideas where to start looking at ? Any common parts on the P5 with
> are known to short over time ?
>
> Thanks for the help !
>
>
>
>
>
>
> Scott Frye
> AudioFixation
> Consumer / Pro Audio Repair
> Southern VT
>
>
>
>
>
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