midierror wrote:Are there any components you would advise me buying as replacements?
It might be wise to identify the fault first, however...
Clearly there is something very wrong with the power supply! It would appear that IC1 isn't working properly to control Q1. The negative rail is derived from the positive rail voltage, so if you can fix V+, V- should sort itself out.
It would be worthwhile looking very carefully at all the solder joints under the board to make sure none are 'dry', and if IC1 is in a socket check that it is seated firmly and all its pins are in the right holes (it's not unknown for a pin to miss its socket and get folded underneath).
I've not come across a failed regulator of this type before, but it's obviously possible, so if all the other visual checks look good, and IC1 is in a socket, I'd be tempted to substitute a new uA723 regulator. If it's soldered directly into the board, some further measurements might be wise to try to confirm the 723 has failed, since removing it will risk board damage.