HP 8340A Service Manual page 64

This section provides infor mation and instruction for
troubleshooting,
in the Reference Loop and the M/N
circuit descriptions,
schematics, and co mponent location diagrams for each printed
circuit board assembly.
The Reference Loop produces all of the translation and reference
signals that are used in the other phase-locked
8340A.
The Reference Loop consists of the following sections:
A29 Reference Phase Detector Assembly
*
A30 100 MHz
vcxo
*
The M/N Loop generates the 177-197 MHz
Sampler in the YO Loop.
The M/N Loop consists of the following sections:
A31 M/N Phase Detector Assembly
*
A32 M/N Assembly
vco
*
A33 M/N Output Assembly
*
Model 8340A -
REFERENCE LOOP - M/N LOOP
INTRODUCTION
rep�iring, or replacing assemblies and components
troubleshooting procedures,
Assembly
Scans by HB9HCA and HB9FSX
Service
Loop. Infor mation includes
loops in the
signal that drives the A48
block diagrams,
8-83/8-84