Sweep 
Generator 
- 
YO 
Loop 
Assembly-Level 
Service 
CONTENTS 
INTRODUCTION 
.............................................................. 
D-1 
Assemblies 
..................................................................D-1 
THEORY 
OF 
OPERATION 
..................................................... 
D-2 
Sweep 
Generator 
— 
YO 
Loop Overall 
Theory 
of 
Operation 
........................... 
D-2 
Sweep 
Generator 
— 
YO 
Loop 
Functional 
Group 
Theory of 
Operation 
.................. 
D-4 
Simplified 
Block 
Diagram 
..................................................... 
D-14 
YO 
LOOP 
ASSEMBLY-LEVEL 
TROUBLESHOOTING 
............................. 
D-15 
Introduction 
................................................................ 
D-15 
YO 
UNLK 
- 
CW/Manual 
Mode 
................................................. 
D-15 
YO 
UNLK 
- 
Swept 
Mode 
...................................................... 
D-18 
Troubleshooting Flowchart 
.................................................... 
D-21 
SWEEP 
GENERATOR 
ASSEMBLY-LEVEL 
TROUBLESHOOTING 
.................. 
D-24 
Introduction 
................................................................ 
D-24 
No 
Sweep 
............................................................... 
D-24 
Incorrect 
Sweep 
............... 
............................................ 
D-25 
A23 FM DRIVER 
ASSEMBLY-LEVEL 
TROUBLESHOOTING 
..................... 
D-26 
Troubleshooting 
Block 
Diagram 
................................................ 
D-27 
Major 
Assemblies 
Location 
Diagram 
............................................ 
D-31 
REPAIR PROCEDURES 
...................................................... 
D-36 
Placing the 
YO 
Assembly 
into 
the 
Service 
Position 
................................. 
D-36 
REPLACEABLE 
PARTS 
...................................................... 
D-40 
Attaching 
Hardware 
......................................................... 
D-41 
HP 
8340B/41B 
Table of 
Contents 
i/ii