This is an old post, preserved for reference.
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This week, an Oric Atmos was sent it. Couldn't find anything wrong with it. Sent it back.
Oh, you want more? OK. Well, here follows a comparison between the Oric Atmos and it's predecessor, the Oric-1, including a couple of repairs that didn't justify a writeup themselves.
previous repair where I fit a 'better' one), there was a brief reset pulse. The clock appeared to be running, although it looked a bit rough. I traced it back to the 74LS04 which formed the main 12MHz oscillator, and as soon as I touched the pin with the oscilloscope probe, it came to life and I got a ready screen.
Harlequin ZX Spectrum clone. I power cycled it and again got nothing, probed pin 13 on the chip and it booted. Rather than a 74LS04, I replaced it with a 74HCT04, as I had found those were good for use in oscillators when I tested various chips for my CPU / Clock / Reset board for the RC2014.
Retro Computer Shack SCART cable, as I think the problem was down to them being unable to tune into the RF on whatever modern TV set they were using.
Amstrad CPC 6128 from last week had got one of them instead)