Old Sony ICF7600 schematic

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Does anyone have the schematic of the Sony ICF 7600 SW "world receiver".
I have one whose PLL refuses to lock in or does at best take a "small eternity" to do so (depending on room temperature).
I assume it has to do with the loop filter (or maybe the tuning voltage supply).
But without any schematic diagram things are a little problematic to find.

Regards

Charles
 
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