lizardb0y wrote:First of all, the Sinclair power supplies weren't the most reliable of things when new. They're a 9V unregulated power supply, and the specs can be found in the World of Spectrum FAQ. I'd recommend finding a good modern power supply to test with rather than using the original.
There's also a good chance the keyboard membrane has become brittle and doesn't work. Re-manufactured replacements can be bought from RWAP Software at reasonable cost. They come with fitting instructions so should be no problem to replace.
Finally, the most common problems with the hardware are faulty 7805 voltage regulator, RAM or ULA. Service manuals can be found via the aforementioned FAQ.
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