Troubleshooting An Unlocked Yto Pll - Agilent Technologies 8564EC Service Manual

Spectrum analyzers

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Ampliﬁer Polarities

Fractional N

Troubleshooting an Unlocked YTO PLL

1. If the YTO PLL is unlocked, error code 301 should be displayed.

2. Move the jumper on A14J23 to connect pins 2 and 3 (TEST position).

3. On the spectrum analyzer, press

YTO frequency (calculated) =__________________ MHz

4. Measure the YTO frequency at the front-panel 1ST LO OUTPUT

YTO frequency (measured) = ___________________MHz

Place the spectrum analyzer in ZERO SPAN.

illustrates the simpliﬁed YTO PLL.

Figure 11-1 on page 524

code 301 should no longer be displayed. (The YTO PLL feedback

path is now open and the YTO error voltage is forced to zero.)

. The displayed LO FREQ is the desired YTO frequency

calculated. Record the calculated YTO frequency below:

jack and record below:

YTO Error Sign

(A14U313 pin 19)

Figure 11-7 on page

for the location of A14J23. Error

Synthesizer Section

Unlocked YTO PLL

FREQ DIAGNOSE

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