Vintage Synth Repair

>News - I replaced the tantalum cap with one that can handle up to 25v
>and disconnected the other boards from the synth, the cap has not got
>fried at all, but voltages are inaccurate-

This doesn't necessarily mean the problem is entirely fixed unless you 
verify that the transformer secondary voltages are okay.  If they're putting 
out more than they should, you may overheat a regulator once a load is 
connected.


>-15v read -14.6
>+5v  read +4.25
>
>the +15v and -5v are adjustable so they're ok...
>
>What could cause the inaccurate voltages ? should I replace the 7915
>and 7805 ? or maybe some particular caps ? or do they appear like
>this because no board is connected to the PS ?

These regulators should work regardless of load.  If the input voltages are 
okay then you may want to replace them.

>Also, does this indicate that some other board shorts the -15v rail ?

not really, no

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