Troubleshooting An Unlocked Yto Pll - HP 8560A Service Manual

4. Measure the YTO frequency at the front-panel's 1ST LO OUTPUT jack and record
below:
R O L L E R T E S T
A P P R O X - 3 0 dBm
63 TO 105
M A I N R O L L E R F R E O
Figure 10-8. Troubleshooting an Unlocked YTO PLL
5. Calculate the YTO's frequency error by subtracting the frequency recorded in step 3 from
the frequency recorded in step 4. Record the result below:
YTO Frequency Error = YTO Frequency (MEASURED) -YTO
On the HP 8560A, press
Roller frequency below:
7. If the YTO Frequency Error recorded in step 5 is greater than 30 MHz, do the following:
a. Check the Adjustments using
b. Check the YTO DACs using the procedure in steps 41 through 49 below, or using
Manual Probe Troubleshooting with the TAM on
c. Refer to steps 10 through 34 below.
YTO Frequency (measured) =
M A I N C O I L T U N I N G I
F M C O I L
T U N I N G
5 MHz
YTO Frequency Error =
MORE, FREQ DIAGNOSE,
Main Roller Frequency = MHz
the TAM or the procedure in Chapter 2.
I
I
I
SAMPLER
I
I
I - - -
63 TO 105 5 MHz
W H E N LOCKED,SAME
A S M A I N R O L L E R F R E Q
and Record the Main
MAIN ROLLER.
MHz
S K 1 1 0 8
MHz