HP 8560E - Figure 10-6 Unlocked PLL

522 Chapter10
Synthesizer Section
General PLL Troubleshooting
1. The loop integrator output voltage (1) should be attempting to tune
the oscillator to the correct frequency.
• The voltage at (1) should increase as the frequency increases on
all of the PLLs:
Figure 10-6 Unlocked PLL
2. If the integrator output voltage changes in the manner described in
Table 10-6 TAM Tests versus Test Connectors
PLL Measurement Point
YTO PLL A14J23 pin 1 (YTO ERROR)
Reference PLL A15J502 pin 3 (LO3 ERR)
Sampler PLL A15J200 pin 13 (OFL ERR)
Fractional N PLL A14TP13 (INTEGRATOR)