HP 8560E Service Manual page 462

pin 3 with an oscilloscope. The signal should be 20 mV peak-to-peak
±25% (with +2.5 V of dc bias). If the signal measures outside these
limits, the fault is prior to the audio amplifier (block T).
7. If the signal is correct, troubleshoot the audio amplifier and speaker.
Chapter 8
IF Section
Cal Oscillator Assembly (P/O A4)
461