Figure 10-5 Pll Locked At Wrong Frequency; Unlocked Pll - HP 8560E Service Manual

Synthesizer Section
General PLL Troubleshooting
Figure 10-5 PLL Locked at Wrong Frequency

Unlocked PLL

An unlocked PLL can be caused by problems inside or outside the PLL.
Troubleshoot this problem by working backward from the oscillator as
described in the steps below. Numbers in the following text identify
items in Figure 10-6 on page 522.
Chapter 10 521