HP 
8340B/41B 
Assembly-Level 
Service 
CONTENTS 
SERVICE 
INTRODUCTION 
...................................................... 
A 
Introduction 
................................................................. 
A-1 
Overall 
Instrument Theory 
...................................................... 
A-4 
Calibration 
Constants 
........................................................ 
A-11 
Troubleshooting 
Aids 
........................................................ 
A-25 
Front 
Panel  Diagnostics 
...................................................... 
A-26 
Overall 
Instrument 
Troubleshooting 
............................................. 
A-31 
Repair 
Procedures 
.......................................................... 
A-50 
After 
Service 
Safety 
Checks 
.................................................. 
A-51 
REFERENCE LOOP 
- 
M/N 
LOOP 
................................................. 
B 
Reference Loop 
- 
M/N 
Loop 
Introduction 
......................................... 
B-1 
Reference 
Loop 
Theory 
of 
Operation 
............................................ 
B-2 
M/N 
Loop 
Theory 
of 
Operation 
................................................. 
B-4 
Reference 
Loop Assembly-Level 
Troubleshooting 
.................................. 
B-9 
M/N 
Loop 
Assembly-Level 
Troubleshooting 
...................................... 
B-21 
Repair Procedures 
.......................................................... 
B-44 
Replaceable 
Parts 
........................................................... 
B-51 
20-30 
LOOPS 
.................................................................. 
C 
Introduction 
................................................................. 
C-1 
Overall 
Theory 
of Operation 
.................................................... 
C-2 
20-30 
Loops Assembly-Level 
Troubleshooting 
.................................... 
C-11 
Replaceable 
Parts 
........................................................... 
C-20 
SWEEP GENERATOR 
- 
YO 
LOOP 
................................................ 
D 
Introduction 
................................................................. 
D-1 
Theory 
of 
Operation 
.......................................................... 
D-2 
YO 
Loop Assembly-Level 
Troubleshooting 
....................................... 
D-15 
Sweep Generator 
Assembly-Level Troubleshooting 
................................ 
D-24 
A23 
FM 
Driver Assembly-Level 
Troubleshooting 
................................... 
D-26 
Repair 
Procedures 
.......................................................... 
D-36 
Replaceable 
Parts 
........................................................... 
D-40 
MOTHERBOARD AND WIRING 
LIST 
............................................. 
E 
A62 
Motherboard Overall 
Description 
...................................... 
..... 
E-1 
A62 
Motherboard Wiring 
List 
................................................... 
E-3 
HP 
8340B/41B 
Table of 
Contents