Hi, have you checked the voltage on TP2002 on the PLL board? Shall be between 0.5 an 6.5 from 108 to 139.995 and between 0.5 to 6.5 from 140.000 to 173.995.
The switching of the two vco's is done by Q2015 and Q2016, you should see the switching on TP2004 and TP2005 when passing 139,995.
The signal to Q2015 and Q2016 comes from Q2027 which is controlled by the main CPU on AF-CNTL?
I hope you can follow my thoughts.
Nils
SM7DVO
Nils Ostman