HP 8560A Service Manual

10
Synthesizer Section
The Synthesizer Section includes the A7 First LO Distribution Amplifier, All YTO, and parts
of the Al4 Frequency Control and Al5 RF assemblies.
Simplified and detailed block diagrams
for each assembly are located at the end of this chapter.
Page
Confirming a Faulty Synthesizer Section
..................................
10-2
Troubleshooting Test Setup
.............................................
10-7
Troubleshooting Using the TAM
........................................ 10-8
General PLL Troubleshooting
..........................................
lo-13
PLL Locked at Wrong Frequency
..................................... lo-14
Unlocked PLL
....................................................
.. l0-13
Frequency Span Accuracy Problems
....................................
lo-15
Determining the First LO Span
.......................................
lo-15
Confirming Span Problems
...........................................
lo- 16
YTO Main Coil Span Problems (LO Spans >20 MHz)
...................
lo-16
YTO FM Coil Span Problems (LO Spans 1.01 MHz to 20 MHz)
...........
lo-17
Roller Oscillator Span Problems (LO Spans 51 MHz)
...................
lo-18
First LO Span Problems (All Spans)
.................................. lo-21
UnlockedYTO PLL
..................................................
lo-23
Operation
........................................................
. .l0-23
Troubleshooting an Unlocked YTO PLL
...............................
lo-25
Unlocked Roller Oscillator PLL
........................................
lo-32
Operation
........................................................
.. l0-32
Confirming an Unlocked Condition
....................................
lo-32
Offset Oscillator PLL
................................................
lo-33
Transfer Oscillator PLL
..............................................
lo-35
Main Oscillator PLL
................................................
lo-37
Unlocked Offset PLL (Sampling Oscillator)
..............................
lo-39
Operation
........................................................
.. l0-39
Troubleshooting
....................................................
lo-39
Unlocked Reference PLL
..............................................
lo-42
Operation
........................................................
.. l0-42
Troubleshooting
....................................................
lo-42
Third LO Driver Amplifier
...........................................
lo-44
Sampler and Sampler IF
..............................................
lo-45
Sweep Generator Circuit
..............................................
lo-47
A21 OCXO (Option 003 only)
.........................................
lo-52
Caution
All of the assemblies are extremely sensitive to Electrostatic Discharge (ESD).
For further information regarding electrostatic cautions, refer to “Electrostatic
Discharge Information” in Chapter 1.
Synthesizer Section
10-l

HP 8560A Specifications

General

Brand	HP
Model	8560A
Category	Measuring Instruments
Language	English