7.If all of the checks above are correct, the tracking oscillator might not be functioning. Setup the HP 8560A as indicated in the Tracking Oscillator Range Adjustment procedure, using a spectrum analyzer, such as an HP 8566A/B, in place of the frequency counter. Try to adjust AlOC3 until a signal is displayed on the HP 8566A/B. If adjusting AlOC3 does not start the tracking oscillator functioning, the A10 Tracking Generator is suspect.