540 Chapter10
Synthesizer Section
Unlocked YTO PLL
Troubleshooting an Unlocked YTO PLL
1. If the YTO PLL is unlocked, error code 301 should be displayed.
Place the HP 8560E/EC in zero span. Figure 10-7 on page 541
illustrates the simplified YTO PLL.
2. Move the jumper on A14J23 to connect pins 2 and 3 (TEST position).
Refer to Figure 10-3 on page 515 for the location of A14J23. Error
code 301 should no longer be displayed. (The YTO PLL feedback
path is now open and the YTO error voltage is forced to zero.)
3. On the HP 8560E/EC, press
CAL, MORE 1 OF 2, FREQ
DIAGNOSE, and LO FREQ. The displayed LO FREQ is the desired
YTO frequency calculated. Record calculated frequency of the YTO
below:
4. Measure the YTO frequency at the front panel 1ST LO OUTPUT
jack and record below:
YTO Frequency (calculated) = ________________________GHz
YTO Frequency (measured) =________________________ GHz
To Next Page
Loading...
Need help?
General
