Gakken SX-150 problems.

Years ago, I bought a non-working Gakken SX-150. Tonight, I finally got around to trying to get it working.Switching it on lights up the led, so that’s a good start. However, there’s no sound output. Either via the built-in speaker or the "output" socket.
I’ve had the meter on the innards, and there is power to the board. There’s a voltage difference of about half a volt across the Variable resistor track, and the end of the stylus is about 3 volts
I’m a bit stuck now.. no amount of fiddling with switches makes any difference.
I’ll do a bit of research and see what happens.

[Tag SX-150, Projects]

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