Quad FM4 tuning error

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My FM4 tuner has stopped working and it refuses to respond to turn of the tuning pod and/or the presets. It shows 87.20 - flickering to 87.15 - all the time - no matter how the tuning or presets are treated.
I have replaced the battery - allowed it 24 hours of recharcing (power on) and still the same. 😕

Good advises and a schematic would be appreciated.

Jesper
 
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