On 7/13/17 3:24 PM, Rob Jarratt via cctalk wrote:

> The first appears to be a surface mount transistor (it is labelled "TR2"),
> the markings are not very clear. On one board it seems to be marked "1N",
> and on the spare it is marked "S1A". Neither of these seem to turn up on the
> reputable sites, so I wonder if anyone knows of a good equivalent?

did you try here?

SD is probably a Schottky diode

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