a frequency modulated signal is available at the output of the Mixer Amplifier block at tp34. Check that it is present by monitoring this waveform. The frequency deviation is quite small so, if you have an X- expansion control on your oscilloscope, you can adjust the timebase to display about 20 complete cycles. Expand up the rightmost cycles on the display. There should be a slight uncertainty in the positions of these cycles, indicating that the sinewave at tp34 is being frequency modulated