Reference Loop; M/Nloop - HP 8340B Manual

Reference Loop
-
M/N
Loop
Assembly-Level Service
CONTENTS
REFERENCE LOOP
-
M/N LOOP INTRODUCTION
...............................
B-1
Assemblies
................................................................
B-1
REFERENCE LOOP THEORY OF OPERATION
...................................
B-2
A30100 MHz
Voltage Controlled Crystal Oscillator Assembly
........................
B-2
A29 Reference Phase Detector Assembly
.........................................
B-2
A34 Reference
Loop
-
M/N
Loop Motherboard
....................................
B-3
A51 10
MHz
Frequency Standard
................................................
B-3
M/N LOOP THEORY
OF OPERATION
...........................................
B-4
A32 M/N VCO
Assembly
.......................................................
B-4
A33 Output Assembly
.........................................................
B-4
A31 M/N
Phase Detector
......................................................
B-5
Simplified Block
Diagram
......................................................
B-7
REFERENCE LOOP ASSEMBLY-LEVEL TROUBLESHOOTING
............. ......
B-9
Internal
Frequency Standard Output Check
.......................................
B-12
10 MHz Reference Output Check
.............................................
B-13
A30J1 Output
Check
.........................................................
B-13
A30J2
Output Check
.........................................................
B-15
A30W1 Output Check
........................................................
B-16
A29J2
Output Check
........................................................
B-17
A29J3 Output Check
.........................................................
B-17
A29J4
Output Check
........................................................
B-18
A29J5 Output Check
.........................................................
B-19
A51
Reference Oscillator
.....................................................
B-20
M/N LOOP ASSEMBLY-LEVEL TROUBLESHOOTING
..........................
B-21
M/N
Verification and Low Output Power Troubleshooting
...........................
B-21
M/N
Output Frequency Incorrect
...............................................
B-23
A33J1
Output Check (With Phase Lock Loop Closed)
...............................
B-28
A33J1 Output Check
(With
Phase Lock Loop Open)
................................
B-30
A33J2 Output Check
..................................................
.....
B-32
A31TP1 Signal
Check
.................................................. ....
B-34
A31TP2 Output Check
............................................
.......
B-36
A32A1W1 Output Check
......... ................................... ...
.
B-38
A31TP1 and A31TP2
Signal Check
. ,
.........................................
B-39
Troubleshooting Block Diagram
................................................
B-41
Major Assemblies Location Diagram
............................................
B-43
HP 8340B/41B
Table of
Contents