Does anybody have any info on how to adjust R27 and R31 on the 5-5.5 mhz PLL board? The serial input from the microprocessor comes into pin 1, U3 on the 5-5.5 PLL board. Where does this come from? I can not find a number 87 connector on the Logic board. Does the rotary encoder connect to connector 98 on the Logic board? Tnx. AL