Broadband Phase Lock Problems - Agilent Technologies 8719ET Service Manual

Source Troubleshooting

Broadband Phase Lock Problems

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