Olympus OM10 Electronic Engineering

The Olympus OM10 had sophisticated electronics for its time and they made the most with the little space they had. As you can see, it uses a flex circuit, which bends over the prism assembly. Therefore, cleaning the prism is a big job because you would have to desolder some of these wires to get to the parts underneath.

In this diagram, and the large version, you can see all the different colours of wires and their soldering points. This is useful to reference in case you forgot to take notes.

Do not rotate this part after the cover is off because the shaft synchronises with its plastic dial above the cover.

The ASA film speed selector is in fact a variable resistor consisting of a carbon track and wipers. The arc of the carbon track is useful guide if you needed to synchronise the plastic ASA selector dial and its interlocking shaft below.

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