Tuning of the local oscillator frequency on Kenwood TS-590SG.
According to the manual, the variable capacitor that needs to be adjusted is the TC501 (p.77 manual) and this is printed on the PCB, so it’s easy to locate it.
Tip for variable capacitor:
Clockwise: Decreases frequency.
Anticlockwise: Increases frequency.
Make VERY fine and slow adjustments, as the frequency is exceptionally sensitive to the capacitor rotation.