Agilent Technologies HP 8719D Service Manual page 232

1.
Connect an oscilloscope to A14TPl (labeled VCO12).
2.
Press @E'Sj PRESET: FACTSFlY @EEEJ SERVKE PEH? ESJWSCE AXES
3.
Vary the fractional-N VCO frequency with the front panel knob.
4.
If the waveforms do not resemble Figure 7-4 at the frequencies indicated,
replace A14. (The amplitude of the waveforms wiII vary from 3 V to 10 V
P-P.)
Source Troubleshooting
1 2 0 MHz
180 MHz
Figure 7-4. VCO/2 Wkveforms at Al4TPl
nsec -4
nsec ,-A