I'm working on a NAD 7140 that has a defective tuner. Unfortunatly I hav'nt found a schematic with voltages listed on it. The tuner will scan but never pick up a station on fm, it works ok on am. Test point 102 voltage never changes as it scans stations.This the variable voltage going to the tuner for changing capacitance in the different tuner sections.On the am i can see the voltage change on test point 101. Dual op amp (feeds tp- 101 and 102) Whats interesting is I can't read any voltage change on the input of the op amp with my volt meter as the stations are advanced up or down but I can read voltage change on the output of the op amp when it's in am mode. ic112 (upc4558) has the following voltages on it's pins.All voltages a positive to chassis ground. 1- 1.31 volts 2-4.99 3-3.07 4-0 5-3.07 6-5 7-1.3 8-34 The big pll chip tc9147p chip drives this chip. Any good advice as to how to track down the fm problem would be appreciated.