7-8 Service Guide
Source Troubleshooting 8719ET/20ET/22ET
Broadband Phase Lock Problems 8719ES/20ES/22ES
RF Network Analyzers
Broadband Phase Lock Problems
Phase lock problems can be caused by incorrect pretune correction constants.
1. To fix this potential problem, perform “Source Pretune Correction Constants (Test 43)”
on page 3-6 from Chapter 3 , “Adjustments and Correction Constants.”
2. Then press to see if the phase lock problem
persists.
3. If the phase lock problem persists, perform the “Reference Assembly VCO Tune
Adjustment” on page 3-39. If this fixes the problem, perform the following adjustments
from Chapter 3 .
a. “Output Power Adjustments” on page 3-17
b. “Power Linearity Adjustment” on page 3-24
c. “Raw Offset Correction Constants” on page 3-48
d. “Sampler Calibration Correction Constants (Test 51)” on page 3-58
If the phase lock problem persists, continue with step 4.
4. The phase lock problem could be caused by a fault in one of these source assemblies:
Continue to “Swap IF Output Cables to Check R Sampler Assembly (A64)” on page 7-9.
A12 reference A13 fractional-N analog A14 fractional-N digital
A23,A24 R channel switches
(Options 085,089)
A67 R2 sampler assembly
(Option 400 only)
A72 R channel buffer amp
A25 source switch (8722ET/ES) A51 test set interface A52 pulse generator
A5,A6 source switches A9 source control board A11 phase lock
A54 YIG 2 (8722ET/ES only) A55 YIG 1 A59 source interface board
A58 M/A/D/S A64 R sampler assembly A76 attenuator
A68 6 dB Attenuator
(8719ET/ES and 8720ET/ES)
S5 R channel switches (Options 085,089) A73 R2 channel butter amp
(Option 400 only)
A73 R2 channel buffer amp
(Option 400 only)
A74 transfer switch (Option 400)
Preset
Preset
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