Old Sony ICF7600 schematic

[phase_accurate]

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